Climate and monthly weather forecast
Jefferson, IA

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Weather in January

January, like December, is another subzero cold winter month in Jefferson, Iowa, with an average temperature ranging between min 13.5°F (-10.3°C) and max 26.8°F (-2.9°C). January brings the lowest temperatures, with an average high of 26.8°F (-2.9°C) and an average low of 13.5°F (-10.3°C). 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 varying between 16.9°F (-8.4°C) and 30.6°F (-0.8°C). The shift into February records an average high-temperature of a still subzero cold 30.6°F (-0.8°C), subtly varied 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 fluctuating between 46°F (7.8°C) and 31.1°F (-0.5°C). March is marked by a distinct increase in the average high-temperature, climbing from a freezing cold 30.6°F (-0.8°C) in February to a frosty 46°F (7.8°C). Weather in March »

Weather in April

April is a mild spring month in Jefferson, Iowa, with an average temperature ranging between max 58.5°F (14.7°C) and min 42.1°F (5.6°C). The arrival of April brings a change in Jefferson's weather, with average high-temperatures moving from March's frosty 46°F (7.8°C) to a moderate 58.5°F (14.7°C). Weather in April »

Weather in May

May, the last month of the spring in Jefferson, is a pleasant month, with an average temperature ranging between min 53.1°F (11.7°C) and max 69.4°F (20.8°C). Jefferson's weather shows a temperature rise with the arrival of May, moving from a mild 58.5°F (14.7°C) in April to an agreeable 69.4°F (20.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Jefferson, Iowa, with an average temperature fluctuating between 79.3°F (26.3°C) and 62.8°F (17.1°C). As June arrives, Jefferson's weather shows an increase in high-temperatures, moving from May's pleasant 69.4°F (20.8°C) 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 fluctuating between 82°F (27.8°C) and 64.6°F (18.1°C). Temperature records mark July as the warmest month, with highs averaging 82°F (27.8°C) and lows at 64.6°F (18.1°C). July's 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 another warm month in Jefferson, Iowa, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 61.5°F (16.4°C). The commencement of August notes an average high-temperature of a still warm 80.1°F (26.7°C), exhibiting little difference from the previous month. Weather in August »

Weather in September

September, the first month of the autumn in Jefferson, is also a moderately hot month, with temperature in the range of an average low of 55.8°F (13.2°C) and an average high of 74.8°F (23.8°C). The advent of September brings an average high-temperature of a still warm 74.8°F (23.8°C), almost identical to the preceding month. Weather in September »

Weather in October

October, the same as September, in Jefferson, Iowa, is another refreshing autumn month, with temperature in the range of an average low of 43.9°F (6.6°C) and an average high of 59.9°F (15.5°C). The onset of October witnesses a clear shift in the average high-temperature, dropping from a warm 74.8°F (23.8°C) in September to a moderate 59.9°F (15.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Jefferson, Iowa, with an average temperature fluctuating between 32.5°F (0.3°C) and 45.9°F (7.7°C). Onset of November comes with a temperature decline, the average high falling from a moderate 59.9°F (15.5°C) in October to a chilly 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 ranging between max 32°F (0°C) and min 21°F (-6.1°C). December brings a decrease in the average high-temperature, falling from November's frosty 45.9°F (7.7°C) to a cold 32°F (0°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Jefferson?

With average high temperatures of 26.8°F (-2.9°C) and lows of 13.5°F (-10.3°C), January is the coldest month in Jefferson.

What is the most humid month in Jefferson?

With an average relative humidity of 84%, January is the most humid month in Jefferson.

What is the driest month in Jefferson?

January is the month with the least rainfall in Jefferson. Rain falls for 3.8 days and accumulates 0.87" (22mm) of precipitation.

How many days does it rain in Jefferson?

Throughout the year, in Jefferson, Iowa, there are 125.7 rainfall days, and 26.5" (673mm) of precipitation is accumulated.

When does it snow in Jefferson?

Months with snowfall are January through May, October through December.

What is the snowiest month in Jefferson?

January is the month with the most snowfall. Snow falls for 9.8 days and accumulates 4.29" (109mm) of snow.

How many days does it snow in Jefferson?

Throughout the year, there are 38.1 snowfall days, and 15.31" (389mm) of snow is accumulated.

What is the month with the least sunshine in Jefferson?

The month with the least sunshine is January, with an average of 4.2h of sunshine.

What is the month with the lowest UV index in Jefferson?

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) in Jefferson?

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 in Jefferson?

In Jefferson, snow does not fall in June through September.

When are the longest days in Jefferson?

June has the longest days of the year in Jefferson, Iowa, with an average of 15h and 12min of daylight.

When is the highest UV index in Jefferson?

June and July, with an average maximum UV index of 6, are months with the highest UV index.

What part of the year is the hottest in Jefferson?

The warmest temperatures in Jefferson, Iowa, occur during July, when averages reach a peak of 82°F (27.8°C) and a low of 64.6°F (18.1°C).

What month has the most sunshine in Jefferson?

The month with the most sunshine in Jefferson, Iowa, is July, with an average of 10.2h of sunshine.

What is the least humid month in Jefferson?

October is the least humid month, with an average relative humidity of 69%.

What is the month with the shortest days in Jefferson?

December has the shortest days of the year in Jefferson, with an average of 9h and 12min of daylight.

Average pressure
Jefferson, IA

Average pressure - Jefferson, IA

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed
Jefferson, IA

Average wind speed - Jefferson, IA

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).

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Average rainfall
Jefferson, IA

Average rainfall - Jefferson, IA

The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").

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Average rainfall days
Jefferson, IA

Average rainfall days - Jefferson, IA

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).

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Average snowfall
Jefferson, IA

Average snowfall - Jefferson, IA

The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Jefferson, IA

Average snowfall days - Jefferson, IA

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).

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Average daylight / Average sunshine
Jefferson, IA

Average daylight / Average sunshine - Jefferson, IA

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).

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).

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Average sunshine days
Jefferson, IA

Average sunshine days - Jefferson, IA

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index
Jefferson, IA

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).

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Average visibility
Jefferson, IA

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).

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Jefferson, Iowa, USA

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