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Contents
- The climate of Nampa
- The best time to visit Nampa
- The worst time to visit Nampa
- Spring weather in Nampa
- Summer weather in Nampa
- Autumn weather in Nampa
- Winter weather in Nampa
- 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 Nampa
Nampa, Idaho is characterized by a BSk climate according to the Köppen climate classification, commonly referred to as a mid-latitude steppe. This implies semi-arid conditions typical of the Geographical location, with significant variations in temperature and precipitation throughout the year.
Examining the climatological parameters, temperature swings are evident, reaching a peak high of 91°F (32.8°C) in July and a minimum of 25.7°F (-3.5°C) in December. Humidity fluctuates considerably, topping at 78% in January, falling to a low of 29% between July and August. Rainfall levels vary from a maximum of 1.46" (37mm) in March to a mere 0.12" (3mm) in July and August, with the number of rainfall days peaking in March at 14.3 days and dropping to 3.1 days in August.
Snowfall graces the city between December and February, with as much as 3.23" (82mm) in January complemented by 6.1 snowfall days. Daylight hours range from 9 hours in December and January to 15.4 hours in June, while sunshine hours oscillate from 5.8 hours in January and December to a whopping 12 hours in July.
In terms of wind speed, the annual patterns indicate wind reaching 7.9mph (12.7km/h) in April and gusts clocking 12.5mph (20.1km/h) in March. Cloud cover is most prevalent in the colder months specifically January and December at 39%.
Examining the climatological parameters, temperature swings are evident, reaching a peak high of 91°F (32.8°C) in July and a minimum of 25.7°F (-3.5°C) in December. Humidity fluctuates considerably, topping at 78% in January, falling to a low of 29% between July and August. Rainfall levels vary from a maximum of 1.46" (37mm) in March to a mere 0.12" (3mm) in July and August, with the number of rainfall days peaking in March at 14.3 days and dropping to 3.1 days in August.
Snowfall graces the city between December and February, with as much as 3.23" (82mm) in January complemented by 6.1 snowfall days. Daylight hours range from 9 hours in December and January to 15.4 hours in June, while sunshine hours oscillate from 5.8 hours in January and December to a whopping 12 hours in July.
In terms of wind speed, the annual patterns indicate wind reaching 7.9mph (12.7km/h) in April and gusts clocking 12.5mph (20.1km/h) in March. Cloud cover is most prevalent in the colder months specifically January and December at 39%.
The best time to visit Nampa
Combining the weather parameters, the optimal period to plan a visit to Nampa is from June through August. During this period, the city enjoys the most generous sunshine duration, with daily averages ranging from 11.5 hours to 12 hours. The UV index is at its peak, hitting 7 in July, implying high potential for outdoor activities. Humidity is also at the lowest during these months, reaching a minimal 29%, ensuring a comfortable climate. Dramatically, rainfall levels reach the annual minimum, dictating a largely dry season that tourists can maximize.
The worst time to visit Nampa
On the contrary, the least favorable period for visiting Nampa is January, closely followed by December. These months play host to the lowest temperatures, hitting 26.1°F (-3.3°C) and 25.7°F (-3.5°C) respectively. Accompanied by the highest humidity levels of up to 78% in January and 76% in December, the weather can indeed be quite forbidding. Snowfall is prevalent in these winter months, which although might appeal to winter enthusiasts, can deter sightseeing and outdoor activities.
Spring weather in Nampa
Spring in Nampa is defined by a gradual rise in temperatures, from 52.7°F (11.5°C) to 70.3°F (21.3°C) between March and May. Rainfall levels hit their peak in March at 1.46" (37mm) and taper off to 0.87" (22mm) by May. Humidity undergoes a noticeable drop from 61% in March to 46% in May. Overall, Spring marks a delightful balance between winter's chill and summer's heat.
Summer weather in Nampa
Summer from June to August brings with itself scorching temperatures, climbing from 79.2°F (26.2°C) in June to a sweltering 91°F (32.8°C) in July before cooling to 89.8°F (32.1°C) in August. The region experiences its driest period, recording only 0.12" (3mm) of rainfall in July and August. Humidity remains low and comfortable, marking Nampa's summer as an ideal season for outdoor pursuits.
Autumn weather in Nampa
Autumn is characterized by moderate temperatures ranging from 79°F (26.1°C) in September to 48.7°F (9.3°C) in November. It also witnesses a steady increase in humidity from 35% in September to 62% in November. Rainfall levels see a gradual rise from September's low of 0.2" (5mm) to November's 0.75" (19mm), yet still appealing for open-air activities.
Winter weather in Nampa
Winter, from December to February, sees temperatures plummeting to their lowest, resting between 37.9°F (3.3°C) and 26.1°F (-3.3°C), and dramatic spikes in humidity to as high as 78% in January. The season also experiences relatively high rainfall levels, from 1.38" (35mm) in December to 1.14" (29mm) in February. Snowfall is quite common, with January witnessing the highest figure of 3.23" (82mm). The cold and snow can create challenging conditions for outdoor activities.
Weather in January
In comparison to subsequent months, the weather in Nampa, Idaho, is frigit during January. The snowfall and cold winds paint the cityscape in white, giving the outdoor environment an enchanting winter wonderland aesthetic. However, these conditions can pose a challenge to daily outdoor activities, with the mentioned snow and cold winds being particularly noticeable. Weather in January »
Weather in February
While January presents the most frigid conditions, February presents an improvement in weather. This month's weather still feels wintry but with less severity compared to its predecessor. Witnessing the dissipating snow, with snowfall reducing from 3.23" (82mm) to 2.4" (61mm), signifies a gradual farewell to winter. Weather in February »
Weather in March
March brings along noticeable changes in the Nampa weather. With the advent of spring, the transition from a wintery landscape to softer, milder temperatures becomes distinct. The diminishing frostfulness is replaced by damp conditions, leading to a flourishing green environment. Weather in March »
Weather in April
Bidding goodbye to March's dampness, drier conditions hallmark April in Nampa. The doorway to summer gets widened with spring at its peak, leading to warmer days and cooler nights. Blossoming flora is a treat for sightseeing and photography during this month. Weather in April »
Weather in May
May signifies the end of spring and commencement of summer in Nampa. As does the transition of seasons, temperatures also rise leading to increasingly warm days. Long daylight hours provide an excellent chance to partake in various outdoor events, celebrating the start of the summer. Weather in May »
Weather in June
June is the beacon of summer's arrival in Nampa. The city begins to experience even longer days and a warmer environment. The noticeable increase in the UV index advises the use of potent sun-protective measures to avoid sun-related harm. Weather in June »
Weather in July
July in Nampa reels under the peak summer heat, making it the hottest month of the year with maximum temperatures reaching up to 91°F (32.8°C). Despite the heat, the city showcases a distinctive charm with clear skies enhancing visibility. Weather in July »
Weather in August
As August rolls in, there is a slight reprieve from July's peak temperatures in Nampa. However, summer continues to reign with warm, sunny days and cooler nights. The city graces itself with a host of exciting outdoor events. Despite the degree of warmth decreasing slightly, the overall high temperatures persist and hydration remains crucial. Weather in August »
Weather in September
September brings the departure of summer and welcomes the onset of autumn in Nampa. A subtle drop in temperature brings relief from the scorching heat of previous months. With declining UV index and temperatures, the evening becomes pleasant accentuating the beauty of the city. Weather in September »
Weather in October
October in Nampa is recognized by the arrival of autumn in its full charm. This month brings a noticeable change in visual aesthetics with the foliage transforming into a beautiful palette of red, orange, and golden hues. As October progresses, the days become shorter, and the nights colder. Weather in October »
Weather in November
November witnesses a further drop in temperature in Nampa, paving the way for winter's arrival. It brings a different mood to the cityscape, replacing the autumn colors with a pallor caused by falling leaves. The days become even shorter, marking a noticeable decrease in daylight in comparison to October. Weather in November »
Weather in December
With winter truly setting in, December in Nampa displays its snowy winter coat. Though outdoor activities are limited due to the cold, the holiday festivities make this month vibrant and lively. Snowfall takes center stage, with 3.15" (80mm) being the average accumulation for this month alone. 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 Nampa?
January is the most humid month in Nampa, Idaho, with an average relative humidity of 78%.
How many days does it rain in Nampa?
In Nampa, during the entire year, the rain falls for 98.5 days and collects up to 9.69" (246mm) of precipitation.
When does it snow in Nampa?
Months with snowfall are January through April, November and December.
What is the snowiest month in Nampa?
The month with the most snowfall is January, when snow falls for 6.1 days and typically aggregates up to 3.23" (82mm) of snow.
How much does it snow in Nampa?
In Nampa, Idaho, during the entire year, snow falls for 22.5 days and aggregates up to 10.55" (268mm) of snow.
What are the months with the least sunshine in Nampa?
The months with the least sunshine in Nampa are January and December, with an average of 5.8h of sunshine.
What is the month with the lowest UV index in Nampa?
The months with the lowest UV index in Nampa are January, February, November and December, with an average maximum UV index of 2.
What is the rainiest month in Nampa?
The month with the most rainfall in Nampa is March, when the rain falls for 14.3 days and typically aggregates up to 1.46" (37mm) of precipitation.
When is Daylight Saving Time (DST) in Nampa?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Nampa, Idaho, 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 Nampa?
May through October are months without snowfall.
When are the longest days in Nampa?
The month with the longest days is June, with an average of 15h and 24min of daylight.
What time of the year is the hottest in Nampa?
July, on average, is the warmest month in Nampa, Idaho, registering a high temperature of 91°F (32.8°C) and a low of 62.8°F (17.1°C).
What is the least humid month in Nampa?
The months with the lowest humidity are July and August, with an average relative humidity of 29%.
What is the driest month in Nampa?
July and August are months with the least rain when the rain falls for 3.3 days and typically aggregates up to 0.12" (3mm) of rain.
What month has the most sunshine in Nampa?
With an average of 12h of sunshine, July has the most sunshine of the year in Nampa.
What is the month with the highest UV index in Nampa?
With an average maximum UV index of 7, July is the month with the highest UV index in Nampa.
What part of the year is the coldest in Nampa?
December, recording an average high temperature of 36.5°F (2.5°C) and a low temperature of 25.7°F (-3.5°C), is Nampa's coldest month.
What is the month with the shortest days in Nampa?
The month with the shortest days in Nampa is December, with an average of 9h and 0min of daylight.
Average temperature
Nampa, ID
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (36.5°F).
The month with the highest average low temperature is August (63.3°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure
Nampa, ID
- Average pressure in January:
30.25"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.21"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Nampa, ID
- Average wind speed in January:
5.8mph - Average wind speed in February:
6.9mph - Average wind speed in March:
7.8mph - Average wind speed in April:
7.9mph - Average wind speed in May:
7mph - Average wind speed in June:
6.8mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6mph - Average wind speed in October:
6mph - Average wind speed in November:
6.6mph - Average wind speed in December:
6.5mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is January (5.8mph).
Average humidity
Nampa, ID
The month with the highest relative humidity is January (78%).
The months with the lowest relative humidity are July and August (29%).
Average rainfall
Nampa, ID
- Average rainfall in January:
1.38" - Average rainfall in February:
1.14" - Average rainfall in March:
1.46" - Average rainfall in April:
0.83" - Average rainfall in May:
0.87" - Average rainfall in June:
0.75"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.12" - Average rainfall in September:
0.2" - Average rainfall in October:
0.67" - Average rainfall in November:
0.75" - Average rainfall in December:
1.42"
The wettest month (with the highest rainfall) is March (1.46").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days
Nampa, ID
- Average rainfall days in January:
9.9 days - Average rainfall days in February:
9.7 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
9.4 days - Average rainfall days in June:
7.3 days
- Average rainfall days in July:
3.3 days - Average rainfall days in August:
3.1 days - Average rainfall days in September:
4.9 days - Average rainfall days in October:
7.7 days - Average rainfall days in November:
8.3 days - Average rainfall days in December:
9.3 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is August (3.1 days).
Average snowfall
Nampa, ID
The month with the highest snowfall is January (3.23").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Nampa, ID
- Average snowfall days in January:
6.1 days - Average snowfall days in February:
5.4 days - Average snowfall days in March:
1.7 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
2.3 days - Average snowfall days in December:
6.6 days
The month with the highest number of snowfall days is December (6.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Nampa, ID
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - 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 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
5h and 5min - Average sunshine in February:
7h and 5min - Average sunshine in March:
8h and 0min - Average sunshine in April:
9h and 3min - Average sunshine in May:
11h and 1min - Average sunshine in June:
11h and 3min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 2min - Average sunshine in September:
9h and 3min - Average sunshine in October:
8h and 1min - Average sunshine in November:
6h and 4min - Average sunshine in December:
5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 48min).
Average sunshine days
Nampa, ID
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
14 days - Average sunshine days in April:
16.3 days - Average sunshine days in May:
19.6 days - Average sunshine days in June:
20.3 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
25.2 days - Average sunshine days in September:
23.3 days - Average sunshine days in October:
21.8 days - Average sunshine days in November:
18.9 days - Average sunshine days in December:
17.6 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (14 days).
Average UV index
Nampa, ID
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Nampa, ID
The months with the most cloud cover are January and December (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility
Nampa, ID
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Nampa, Idaho, USA
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