Climate and monthly weather forecast
Thomson, IL

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Weather in January

January, the same as December, in Thomson, Illinois, is a freezing cold winter month, with an average temperature fluctuating between 13.5°F (-10.3°C) and 26.1°F (-3.3°C). January, noted for its average high-temperature of 26.1°F (-3.3°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 Thomson, Illinois, with temperature in the range of an average high of 30.4°F (-0.9°C) and an average low of 16.9°F (-8.4°C). The transition into February is marked with an average high-temperature of a still freezing cold 30.4°F (-0.9°C), showing an insignificant shift from January's 26.1°F (-3.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Thomson, Illinois, with an average temperature varying between 44.6°F (7°C) and 29.8°F (-1.2°C). In Thomson, the average high-temperature in March increases from a freezing cold 30.4°F (-0.9°C) in February to a chilly 44.6°F (7°C). Weather in March »

Weather in April

April is a refreshing spring month in Thomson, Illinois, with an average temperature fluctuating between 40.6°F (4.8°C) and 56.7°F (13.7°C). The rise of average high-temperatures is seen in April, with an increase from a chilly 44.6°F (7°C) in March to a refreshing 56.7°F (13.7°C). Weather in April »

Weather in May

May, the last month of the spring in Thomson, is a pleasant month, with an average temperature ranging between min 51.6°F (10.9°C) and max 68.5°F (20.3°C). The start of May brings a shift in the average high-temperature, increasing from April's mild 56.7°F (13.7°C) to a pleasant 68.5°F (20.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Thomson, Illinois, with an average temperature fluctuating between 60.8°F (16°C) and 77.4°F (25.2°C). June's arrival brings a slight change in high-temperatures, adjusting from a pleasant 68.5°F (20.3°C) in May to a moderately hot 77.4°F (25.2°C). Weather in June »

Weather in July

July, like June, in Thomson, Illinois, is a moderately hot summer month, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 63.5°F (17.5°C). In Thomson, July is identified by the highest average temperatures, reaching a peak of 80.1°F (26.7°C) and a low of 63.5°F (17.5°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Thomson, Illinois, with an average temperature fluctuating between 61.2°F (16.2°C) and 79.2°F (26.2°C). The ushering in of August brings an average high-temperature of a still moderately hot 79.2°F (26.2°C), closely mirroring the 80.1°F (26.7°C) of July. Weather in August »

Weather in September

September, the first month of the autumn in Thomson, is still a warm month, with an average temperature fluctuating between 73.4°F (23°C) and 54.5°F (12.5°C). The onset of September brings a small shift in high-temperatures, falling from 79.2°F (26.2°C) in August to a still warm 73.4°F (23°C). Weather in September »

Weather in October

October, the same as September, in Thomson, Illinois, is another refreshing autumn month, with an average temperature ranging between min 43.5°F (6.4°C) and max 59.7°F (15.4°C). The beginning of October marks a decrease in the average high-temperature, transitioning from a warm 73.4°F (23°C) in September to a refreshing 59.7°F (15.4°C). Weather in October »

Weather in November

November, the last month of the autumn in Thomson, is also a frosty month, with an average temperature ranging between min 31.6°F (-0.2°C) and max 45.1°F (7.3°C). November indicates a noticeable reduction in the average high-temperature, moving down from a moderate 59.7°F (15.4°C) in October to a frosty 45.1°F (7.3°C). Weather in November »

Weather in December

The first month of the winter, December, is also an icy month in Thomson, Illinois, with an average temperature varying between 32.7°F (0.4°C) and 22.5°F (-5.3°C). During Thomson's transition into December, the average high-temperature lessens, moving from a chilly 45.1°F (7.3°C) in November to an icy 32.7°F (0.4°C). Weather in December »
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

January, noted for its average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 13.5°F (-10.3°C), is considered the coldest month.

What is the most humid month?

With an average relative humidity of 86%, January is the most humid month.

How much does it rain?

Throughout the year, there are 149.3 rainfall days, and 29.76" (756mm) of precipitation is accumulated.

When does it snow?

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

When does it snow the most?

The month with the most snowfall is January, when snow falls for 11.7 days and typically aggregates up to 5.12" (130mm) of snow.

How much does it snow?

In Thomson, during the entire year, snow falls for 41.2 days and aggregates up to 16.73" (425mm) of snow.

What is the month with the least sunshine?

The month with the least sunshine is January, with an average of 3.7h of sunshine.

When is the lowest UV index in Thomson?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the driest month?

February is the month with the least rainfall. Rain falls for 4.4 days and accumulates 1.38" (35mm) of precipitation.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Thomson, 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?

May is the month with the most rainfall. Rain falls for 18.5 days and accumulates 4.09" (104mm) of precipitation.

When it does not snow?

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

When are the longest days?

With an average of 15h and 12min of daylight, June has the longest days of the year.

What are the warmest months in Thomson?

July is the warmest month in Thomson, exhibiting average temperatures of 80.1°F (26.7°C) at the peak and 63.5°F (17.5°C) at the base.

What month has the most sunshine?

July has the most sunshine of the year in Thomson, Illinois, with an average of 9.8h of sunshine.

When is the highest UV index in Thomson?

July is the month with the highest UV index, with an average maximum UV index of 6.

What is the least humid month?

October is the least humid month, with an average relative humidity of 74%.

What is the month with the shortest days?

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

Average temperature
Thomson, IL

Average temperature - Thomson, IL

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (26.1°F).

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

Average pressure
Thomson, IL

Average pressure - Thomson, IL

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed
Thomson, IL

Average wind speed - Thomson, IL

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity
Thomson, IL

Average humidity - Thomson, IL

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).

Average rainfall
Thomson, IL

Average rainfall - Thomson, IL

The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is February (1.38").

Average rainfall days
Thomson, IL

Average rainfall days - Thomson, IL

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is February (4.4 days).

Average snowfall
Thomson, IL

Average snowfall - Thomson, IL

The month with the highest snowfall is January (5.12").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Thomson, IL

Average snowfall days - Thomson, IL

The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Thomson, IL

Average daylight / Average sunshine - Thomson, IL

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: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days
Thomson, IL

Average sunshine days - Thomson, IL

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (9.6 days).

Average visibility
Thomson, IL

Average visibility - Thomson, IL

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).

Thomson, Illinois, USA

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