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Contents
- 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
Weather in January
January, the same as December, in Jefferson, Iowa, is a freezing cold winter month, with temperature in the range of an average high of 26.8°F (-2.9°C) and an average low of 13.5°F (-10.3°C). January, noted for its average high-temperature of 26.8°F (-2.9°C) and an average low-temperature of 13.5°F (-10.3°C), is considered the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Jefferson, Iowa, with an average temperature ranging between min 16.9°F (-8.4°C) and max 30.6°F (-0.8°C). Entering February, the average high-temperature is recorded at a still freezing cold 30.6°F (-0.8°C), exhibiting a minimal shift from January's 26.8°F (-2.9°C). Weather in February »
Weather in March
March, the first month of the spring in Jefferson, is a chilly month, with an average temperature varying between 46°F (7.8°C) and 31.1°F (-0.5°C). A clear rise in the average high-temperature is observed during March, increasing from a subzero cold 30.6°F (-0.8°C) in February to a frosty 46°F (7.8°C). Weather in March »
Weather in April
April in Jefferson, Iowa, is a refreshing spring month, with temperature in the range of an average low of 42.1°F (5.6°C) and an average high of 58.5°F (14.7°C). In Jefferson, the average high-temperature in April rises, from a frosty 46°F (7.8°C) in March, to a mild 58.5°F (14.7°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Jefferson, Iowa, with an average temperature fluctuating between 69.4°F (20.8°C) and 53.1°F (11.7°C). Jefferson's weather shows a temperature rise with the arrival of May, moving from a moderate 58.5°F (14.7°C) in April to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
June, the first month of the summer in Jefferson, is a moderately hot month, with an average temperature fluctuating between 62.8°F (17.1°C) and 79.3°F (26.3°C). June's onset is marked by a temperature increase, moving from a pleasant 69.4°F (20.8°C) in May to a warm 79.3°F (26.3°C). Weather in June »
Weather in July
July, like June, in Jefferson, Iowa, is another warm summer month, with an average temperature ranging between max 82°F (27.8°C) and min 64.6°F (18.1°C). July, with its average high-temperature of 82°F (27.8°C) and an average low-temperature of 64.6°F (18.1°C), holds the record as the warmest month. For July, the heat index is appraised at a tropical 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Jefferson, Iowa, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 80.1°F (26.7°C). August's onset sees an average high-temperature of a still moderately hot 80.1°F (26.7°C), exhibiting a slight fluctuation from the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Jefferson, Iowa, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 55.8°F (13.2°C). Jefferson ushers in September with an average high-temperature of a still moderately hot 74.8°F (23.8°C), showing a close resemblance to the previous month. Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Jefferson, Iowa, with an average temperature fluctuating between 43.9°F (6.6°C) and 59.9°F (15.5°C). In Jefferson, the average high-temperature in October significantly decreases from a moderately hot 74.8°F (23.8°C) in September to a refreshing 59.9°F (15.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Jefferson, is also a frosty month, with temperature in the range of an average low of 32.5°F (0.3°C) and an average high of 45.9°F (7.7°C). November implies a gentle temperature shift, with average high-temperatures reducing from October's refreshing 59.9°F (15.5°C) to a frosty 45.9°F (7.7°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Jefferson, Iowa, with an average temperature varying between 32°F (0°C) and 21°F (-6.1°C). December indicates a shift in the average high-temperature, from November's frosty 45.9°F (7.7°C) to a wintry 32°F (0°C). Weather in December »
Updated: Jul 11, 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 are the coldest months?
In Jefferson, January records the average lowest temperatures, peaking at 26.8°F (-2.9°C) and reaching a low of 13.5°F (-10.3°C).
What is the most humid month?
With an average relative humidity of 84%, January is the most humid month.
What is the driest month?
January is the month with the least rainfall. Rain falls for 3.8 days and accumulates 0.87" (22mm) of precipitation.
How much does it rain in Jefferson?
Throughout the year, there are 125.7 rainfall days, and 26.5" (673mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall in Jefferson. Snow falls for 9.8 days and accumulates 4.29" (109mm) of snow.
How much does it snow in Jefferson?
In Jefferson, during the entire year, snow falls for 38.1 days and aggregates up to 15.31" (389mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.2h of sunshine.
When is the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month in Jefferson?
May is the month with the most rainfall. Rain falls for 16.2 days and accumulates 4.06" (103mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
With an average of 15h and 12min of daylight, June has the longest days of the year in Jefferson.
When is the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What is the warmest month in Jefferson?
July, known for its average high temperature of 82°F (27.8°C) and an average low temperature of 64.6°F (18.1°C), is the warmest month.
What month has the most sunshine?
With an average of 10.2h of sunshine, July has the most sunshine of the year.
What is the least humid month?
October is the least humid month, with an average relative humidity of 69%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 12min of daylight.
Average temperature
Jefferson, IA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure
Jefferson, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Jefferson, IA
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9.1mph - Average wind speed in June:
8.3mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7.1mph - Average wind speed in September:
8.3mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.2mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity
Jefferson, IA
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall
Jefferson, IA
- Average rainfall in January:
0.87" - Average rainfall in February:
1.02" - Average rainfall in March:
1.54" - Average rainfall in April:
2.76" - Average rainfall in May:
4.06" - Average rainfall in June:
3.94"
- Average rainfall in July:
2.28" - Average rainfall in August:
2.44" - Average rainfall in September:
2.91" - Average rainfall in October:
2.2" - Average rainfall in November:
1.14" - Average rainfall in December:
1.34"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").
Average rainfall days
Jefferson, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.4 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
16.2 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
14.1 days - Average rainfall days in August:
13 days - Average rainfall days in September:
11.2 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
4.8 days
The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).
Average snowfall
Jefferson, IA
- Average snowfall in January:
4.29" - Average snowfall in February:
3.66" - Average snowfall in March:
1.89" - Average snowfall in April:
1.26" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Jefferson, IA
- Average snowfall days in January:
9.8 days - Average snowfall days in February:
8.8 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
1.7 days - Average snowfall days in May:
0.3 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:
0.6 days - Average snowfall days in November:
3.4 days - Average snowfall days in December:
8.3 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Jefferson, IA
- 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 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - 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 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 5min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 4min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Jefferson, IA
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
16.5 days - Average sunshine days in March:
16 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
11.1 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
16.3 days - Average sunshine days in September:
17.2 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
19.4 days - Average sunshine days in December:
18.8 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index
Jefferson, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover
Jefferson, IA
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility
Jefferson, IA
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Jefferson, Iowa, USA
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