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Contents
- The climate of American Falls
- The best time to visit American Falls
- The worst time to visit American Falls
- Spring weather in American Falls
- Summer weather in American Falls
- Autumn weather in American Falls
- Winter weather in American Falls
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of American Falls
Located in the state of Idaho, USA, American Falls is dominated by a BSk Köppen climate category, that translates to a mid-latitude steppe. This climate is characteristic of regions situated far away from both the equator and the poles, receiving a medium amount of rainfall and sunlight throughout the year.
American Falls showcases a color palette on the weather canvas that brings variation throughout the year with a clear distinction between the four seasons. The fluctuating weather pattern takes the temperature from a chilly 18°F (-7.8°C) in winter to a warm 85.8°F (29.9°C) in the peak of summer. The humidity responds similarly, following never-constant values that oscillates between 32% in August and 86% in January.
Residents of the city experience variation, not only in temperature and humidity, but also in a number of weather conditions. Rainfall ranges from a minimum of 0.59" (15mm) in July to a maximum of 1.18" (30mm) in March, coming in intermittent spells across the year. Snowfall, mostly confined to the winter months, is seen from November to April with 7.2" (183mm) in January being a noticeable figure.
Unique to this region is the shift in daylight hours from 9.5 hours in January to 15.3 hours in June, the longest it gets throughout the year. Corresponding to this, sunshine hours range from a low of 5.1 hours in January to a high of 11.9 hours in June and July. It's noteworthy that in one distinct month, June, the UV index reaches an annual peak of 6.
Within this mid-latitude steppe climate, a constant barometric reading is maintained from 29.89" (759mm) in June to 30.3" (770mm) in January. Winds, on the other hand, follow a mild nature throughout the year, ranging from 7mph (11.3km/h) in January and December to 9.6mph (15.4km/h) during April.
American Falls showcases a color palette on the weather canvas that brings variation throughout the year with a clear distinction between the four seasons. The fluctuating weather pattern takes the temperature from a chilly 18°F (-7.8°C) in winter to a warm 85.8°F (29.9°C) in the peak of summer. The humidity responds similarly, following never-constant values that oscillates between 32% in August and 86% in January.
Residents of the city experience variation, not only in temperature and humidity, but also in a number of weather conditions. Rainfall ranges from a minimum of 0.59" (15mm) in July to a maximum of 1.18" (30mm) in March, coming in intermittent spells across the year. Snowfall, mostly confined to the winter months, is seen from November to April with 7.2" (183mm) in January being a noticeable figure.
Unique to this region is the shift in daylight hours from 9.5 hours in January to 15.3 hours in June, the longest it gets throughout the year. Corresponding to this, sunshine hours range from a low of 5.1 hours in January to a high of 11.9 hours in June and July. It's noteworthy that in one distinct month, June, the UV index reaches an annual peak of 6.
Within this mid-latitude steppe climate, a constant barometric reading is maintained from 29.89" (759mm) in June to 30.3" (770mm) in January. Winds, on the other hand, follow a mild nature throughout the year, ranging from 7mph (11.3km/h) in January and December to 9.6mph (15.4km/h) during April.
The best time to visit American Falls
The optimal period to visit American Falls occurs between May and August when the weather is at its warmest. The temperature varies from a comfortable 64°F (17.8°C) to a peak of 85.8°F (29.9°C) in July, coupled with a relative humidity oscillating between 33% and 51%. Precipitation is also at a minimum during these months, with rainfall varying from 0.59" (15mm) in July to 1.1" (28mm) in May. The daylight hours reach their zenith with almost 15 hours of daylight in June.
The worst time to visit American Falls
The period from December to February serves as the most challenging to visit American Falls due to extreme winter conditions. The temperature plummet down to an average low of 18°F (-7.8°C) in both January and December. Snowfall prevails, reaching its peak in January with a significant 7.2" (183mm) of snow. Daylight hours are truncated, and sunshine hours are lower than at any other point in the year.
Spring weather in American Falls
Spring, from March to May, sees the transition from the cold winter months to the warm summer period. Temperatures progressively increase from an average of 44.2°F (6.8°C) in March to 64°F (17.8°C) in May. Rainfall oscillates between 0.91" (23mm) to 1.18" (30mm), making these months relatively moist. Daylight expands extensively during spring, starting from 12 hours in March and extending to nearly 15 hours by May's end.
Summer weather in American Falls
Summers in American Falls, from June to August, are characterized by the highest temperatures and longest daylight hours of the year. Monthly temperatures span from 74.7°F (23.7°C) to 85.8°F (29.9°C) at the apex, with relative humidity varying from a yearly low of 32% up to 45%. With rainfall considerably reduced during this period, visitors can enjoy outdoor activities under clear and dry conditions during the plentiful sunshine hours.
Autumn weather in American Falls
Autumn, from September to November, in American Falls witnesses a significant drop in temperatures, plummeting from an average of 73.9°F (23.3°C) in September to 42.6°F (5.9°C) by November. Rainfall remains consistent, hovering around 0.75" (19mm). Daylight hours gradually recede from 12.5 hours in September to just under 10 hours in November. This period is marked by a relatively calm wind speed of 7.6mph (12.2km/h) to 7.8mph (12.6km/h).
Winter weather in American Falls
Winter is quite harsh in American Falls, with cold and snowy conditions prevailing from December through February. Temperatures during these months mostly remain below freezing point, oscillating from 18°F (-7.8°C) to 29.7°F (-1.3°C). Snowfall accumulates to peak at 7.2" (183mm) in January, accompanied by a heightened relative humidity of 84% to 86%. Despite the limited daylight hours and minimal sunshine, the serene, snowy landscape does have its unique charm.
Weather in January
American Falls, Idaho is typically swept by chilly January breezes traveling at around 7mph (11.3km/h) while the temperature ranges from 18°F (-7.8°C) to a high of 29.7°F (-1.3°C). Snowy days take up half of the month, accompanied by heavy cloud cover. Weather in January »
Weather in February
Residents of American Falls would observe a slight relief from freezing temperatures in February, with both the highs and lows moving up several degrees from January. Snowfall decreases noticeably but still accounts for a significant amount of winter precipitation. Weather in February »
Weather in March
March in American Falls marks a notable warming phase with temperatures venturing into the mid-40s°F. The arrival of springtime sees a lush increase in daylight hours, an improvement from the drearier winter months. The higher temperature levels correlate with diminished snowfall, signifying the transition out of the winter season. Weather in March »
Weather in April
The warming trend continues into April in American Falls, with temperatures nudging past the 50°F (10°C) barrier. Swapping snowflakes for raindrops, April experiences a dip in accumulated snowfall to a mere 0.63 in. Alongside, there is a pleasant increase in hours of sunlight, offering more opportunities for soaking up some much-needed Vitamin D. Weather in April »
Weather in May
Coming into May, American Falls witnesses the shift to more pleasant conditions as the weather turns significantly warmer. As expected of the late spring period, monthly highs scale beyond a comfortable 60°F (15.6°C). The town prepares to bid farewell to snowfall, with the last of the winter's traces fading out early in the month. Weather in May »
Weather in June
American Falls kicks off summer in June, with temperatures soaring to a high of 74.7°F (23.7°C). The warmer readings push snowfall entirely out of the picture, setting the stage for pure, sunny summer days. Relative humidity drops significantly, contributing to the rather dry air. Weather in June »
Weather in July
The zenith of summer comes in July for American Falls, with the mercury climbing as high as 85.8°F (29.9°C). It is no surprise to find the month devoid of snowfall, while the number of hours one can bask in the sun reaches its maximum. Weather in July »
Weather in August
August retains the high heat in American Falls, but a slight dip marks the beginning of the transition toward the fall season. The relative humidity remains constant with no marked rise or fall from July. The month holds onto the stretched daylight hours and elevated UV index. Weather in August »
Weather in September
September in American Falls brings a gradual transition towards cooler autumn weather. A notable dip in temperatures underscores the shift away from the summer season. The increased cloudiness reflects the slowly dipping temperature levels. Weather in September »
Weather in October
October sees the full onset of autumn in American Falls. Temperatures slide into more bearable ranges, making outdoor activities more comfortable without the summer heat. The elevated relative humidity signifies the moisture in the air, while the decreasing daylight hours promise a change in season. Weather in October »
Weather in November
November welcomes American Falls into the firm grip of winter, with freezing temperatures becoming more frequent. The chill comes hand in hand with increased snowfall, dialing up to a significant 2.76 in for the month. A consistent drop in the number of daylight hours impacts the overall brightness of the town. Weather in November »
Weather in December
Wrapping up the year, December brings American Falls back to solid winter footing with temperatures dropping to a chilly 18°F (-7.8°C). The increase in snowfall to its annual high of 5.28" (134mm) paints a picture of a white Christmas. Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the most humid month in American Falls?
With an average relative humidity of 86%, January is the most humid month in American Falls.
How much does it rain in American Falls?
Throughout the year, in American Falls, Idaho, there are 108.7 rainfall days, and 10.47" (266mm) of precipitation is accumulated.
When does it snow in American Falls?
January through May, September through December are months with snowfall in American Falls, Idaho.
What is the snowiest month in American Falls?
January is the month with the most snowfall in American Falls, Idaho. Snow falls for 12.3 days and accumulates 7.2" (183mm) of snow.
How much does it snow in American Falls?
Throughout the year, in American Falls, Idaho, there are 57.1 snowfall days, and 25.2" (640mm) of snow is accumulated.
What is the month with the least sunshine in American Falls?
With an average of 5.1h of sunshine, January has the least sunshine of the year.
What is the rainiest month in American Falls?
The month with the most rainfall is March, when the rain falls for 12.5 days and typically aggregates up to 1.18" (30mm) of precipitation.
When is Daylight Saving Time (DST) in American Falls?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in American Falls, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
When it does not snow in American Falls?
June through August are months without snowfall.
When are the longest days in American Falls?
With an average of 15h and 18min of daylight, June has the longest days of the year in American Falls.
What is the month with the most sunshine in American Falls?
The months with the most sunshine are June and July, with an average of 11.9h of sunshine.
What are the months with the highest UV index in American Falls?
The months with the highest UV index in American Falls, Idaho, are June and July, with an average maximum UV index of 6.
What is the warmest month in American Falls?
July is the warmest month in American Falls, with the temperature often reaching an average high of 85.8°F (29.9°C) and an average low of 57.7°F (14.3°C).
What is the driest month in American Falls?
The month with the least rainfall in American Falls, Idaho, is July, when the rain falls for 8 days and typically collects 0.59" (15mm) of precipitation.
What is the least humid month in American Falls?
With an average relative humidity of 32%, August is the least humid month in American Falls, Idaho.
What is the coldest time of year in American Falls?
December proves to be the coldest month in American Falls, Idaho, recording an average maximum temperature of 29.3°F (-1.5°C) and a minimum temperature of 18°F (-7.8°C).
What is the month with the shortest days in American Falls?
The month with the shortest days is December, with an average of 9h and 6min of daylight.
When is the lowest UV index in American Falls?
The month with the lowest UV index in American Falls is December, with an average maximum UV index of 1.
Average temperature
American Falls, ID
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (29.3°F).
The month with the highest average low temperature is August (58.5°F).
The coldest months (with the lowest average low temperature) are January and December (18°F).
Average pressure
American Falls, ID
- Average pressure in January:
30.3"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.16"Hg - Average pressure in December:
30.26"Hg
The month with the highest atmospheric pressure is January (30.3"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
American Falls, ID
- Average wind speed in January:
7mph - Average wind speed in February:
8.3mph - Average wind speed in March:
8.6mph - Average wind speed in April:
9.6mph - Average wind speed in May:
8.1mph - Average wind speed in June:
8.4mph
- Average wind speed in July:
7.4mph - Average wind speed in August:
7.3mph - Average wind speed in September:
7.6mph - Average wind speed in October:
7.8mph - Average wind speed in November:
7.6mph - Average wind speed in December:
7mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest months (with the lowest average wind speed) are January and December (7mph).
Average humidity
American Falls, ID
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (32%).
Average rainfall
American Falls, ID
- Average rainfall in January:
1.1" - Average rainfall in February:
1.02" - Average rainfall in March:
1.18" - Average rainfall in April:
0.91" - Average rainfall in May:
1.1" - Average rainfall in June:
0.79"
- Average rainfall in July:
0.59" - Average rainfall in August:
0.63" - Average rainfall in September:
0.75" - Average rainfall in October:
0.75" - Average rainfall in November:
0.75" - Average rainfall in December:
0.91"
The wettest month (with the highest rainfall) is March (1.18").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days
American Falls, ID
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
8.4 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
12.3 days - Average rainfall days in May:
11.6 days - Average rainfall days in June:
9 days
- Average rainfall days in July:
8 days - Average rainfall days in August:
8.3 days - Average rainfall days in September:
8.2 days - Average rainfall days in October:
8.2 days - Average rainfall days in November:
7.3 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is January (6.4 days).
Average snowfall
American Falls, ID
- Average snowfall in January:
7.2" - Average snowfall in February:
5.31" - Average snowfall in March:
3.35" - Average snowfall in April:
0.63" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is January (7.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days
American Falls, ID
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
12.8 days - Average snowfall days in March:
7.4 days - Average snowfall days in April:
2.5 days - Average snowfall days in May:
0.5 days - Average snowfall days in June:
0.1 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.2 days - Average snowfall days in October:
0.8 days - Average snowfall days in November:
6.8 days - Average snowfall days in December:
13.7 days
The month with the highest number of snowfall days is December (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
American Falls, ID
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
6h and 0min - Average sunshine in March:
8h and 0min - Average sunshine in April:
9h and 5min - Average sunshine in May:
10h and 5min - Average sunshine in June:
11h and 5min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 5min - Average sunshine in September:
9h and 5min - Average sunshine in October:
7h and 4min - Average sunshine in November:
6h and 3min - Average sunshine in December:
5h and 1min
The months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days
American Falls, ID
- Average sunshine days in January:
17.3 days - Average sunshine days in February:
12.4 days - Average sunshine days in March:
14.1 days - Average sunshine days in April:
14 days - Average sunshine days in May:
16.4 days - Average sunshine days in June:
17.3 days
- Average sunshine days in July:
17.3 days - Average sunshine days in August:
17.3 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
20.3 days - Average sunshine days in November:
18.1 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is February (12.4 days).
Average UV index
American Falls, ID
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
American Falls, ID
The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility
American Falls, ID
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
American Falls, Idaho, USA
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