Climate and monthly weather forecast
Simpson, IL

Weather in January

January, like December, in Simpson, Illinois, is a wintry winter month, with an average temperature ranging between min 27°F (-2.8°C) and max 40.1°F (4.5°C). The coldest month is January, with an average high-temperature of 40.1°F (4.5°C) and an average low-temperature of 27°F (-2.8°C). Weather in January »

Weather in February

The last month of the winter, February, is a frosty month in Simpson, Illinois, with an average temperature ranging between min 30.7°F (-0.7°C) and max 45.1°F (7.3°C). In February, the average high-temperature is relatively the same as in January - a chilly 45.1°F (7.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a moderate month in Simpson, Illinois, with temperature in the range of an average low of 39.7°F (4.3°C) and an average high of 55.8°F (13.2°C). In Simpson, Illinois, the average high-temperature in March increases from a frosty 45.1°F (7.3°C) in February to a mild 55.8°F (13.2°C). Weather in March »

Weather in April

April is a comfortable spring month in Simpson, Illinois, with temperature in the range of an average high of 66.6°F (19.2°C) and an average low of 48.9°F (9.4°C). In Simpson, the average high-temperature in April increases from a mild 55.8°F (13.2°C) in March to a comfortable 66.6°F (19.2°C). Weather in April »

Weather in May

May, the last month of the spring in Simpson, is a moderately hot month, with an average temperature varying between 57.9°F (14.4°C) and 75.7°F (24.3°C). In Simpson, the average high-temperature in May increases from an enjoyable 66.6°F (19.2°C) in April to a moderately hot 75.7°F (24.3°C). Weather in May »

Weather in June

June, the first month of the summer in Simpson, is also a moderately hot month, with an average temperature ranging between min 66.2°F (19°C) and max 85.6°F (29.8°C). In June, the average high-temperature rises from 75.7°F (24.3°C) in May to a still warm 85.6°F (29.8°C). Weather in June »

Weather in July

July is a tropical summer month in Simpson, Illinois, with an average temperature varying between 68.5°F (20.3°C) and 88°F (31.1°C). With an average high-temperature of 88°F (31.1°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month. In July, the average heat index is appraised at an extremely hot 104°F (40°C). Weather in July »

Weather in August

August, the last month of the summer in Simpson, is also a hot month, with an average temperature ranging between min 66.7°F (19.3°C) and max 86.5°F (30.3°C). In Simpson, the average high-temperature in August is practically the same as in July - a still tropical 86.5°F (30.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Simpson, Illinois, with an average temperature fluctuating between 60.6°F (15.9°C) and 81.1°F (27.3°C). In Simpson, Illinois, the average high-temperature in September marginally drops from a hot 86.5°F (30.3°C) in August to a moderately hot 81.1°F (27.3°C). Weather in September »

Weather in October

October, like September, in Simpson, Illinois, is another comfortable autumn month, with an average temperature fluctuating between 49.6°F (9.8°C) and 67.8°F (19.9°C). In Simpson, the average high-temperature in October drops from a moderately hot 81.1°F (27.3°C) in September to an enjoyable 67.8°F (19.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Simpson, Illinois, with an average temperature ranging between min 38.8°F (3.8°C) and max 54.5°F (12.5°C). In Simpson, the average high-temperature in November drops from an enjoyable 67.8°F (19.9°C) in October to a fresh 54.5°F (12.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a frosty month in Simpson, Illinois, with an average temperature fluctuating between 44.8°F (7.1°C) and 32.7°F (0.4°C). In Simpson, the average high-temperature in December drops from a cool 54.5°F (12.5°C) in November to a chilly 44.8°F (7.1°C). Weather in December »
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FAQ

What is the coldest month in Simpson?

January is the coldest month, with an average high-temperature of 40.1°F (4.5°C) and an average low-temperature of 27°F (-2.8°C).

How much does it rain in Simpson?

Throughout the year, there are 118.3 rainfall days, and 13.03" (331mm) of precipitation is accumulated.

When does it snow in Simpson?

January through March, November and December are months with snowfall.

How much does it snow in Simpson?

Throughout the year, in Simpson, there are 11 snowfall days, and 1.57" (40mm) of snow is accumulated.

What is the month with the least sunshine in Simpson?

The months with the least sunshine in Simpson are January and February, with an average of 4.6h of sunshine.

What are the months with the lowest UV index in Simpson?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Simpson, Illinois.

When does it snow the most in Simpson?

The month with the most snowfall is February, when snow falls for 3.2 days and typically aggregates up to 0.67" (17mm) of snow.

What is the most humid month in Simpson?

The months with the highest humidity in Simpson are March and May, with an average relative humidity of 79%.

When is Daylight Saving Time (DST) in Simpson?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Simpson, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow in Simpson?

April through October are months without snowfall in Simpson, Illinois.

What are the months with the highest UV index in Simpson?

May through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the wettest month in Simpson?

The month with the most rainfall in Simpson, Illinois, is June, when the rain falls for 12.5 days and typically aggregates up to 1.5" (38mm) of precipitation.

When are the longest days in Simpson?

The month with the longest days in Simpson, Illinois, is June, with an average of 14h and 43min of daylight.

What are the months with the most sunshine in Simpson?

June and July, with an average of 10.4h of sunshine, are months with the most sunshine in Simpson.

What is the warmest month in Simpson?

The warmest month in Simpson is July, with an average high-temperature of 88°F (31.1°C) and an average low-temperature of 68.5°F (20.3°C).

What is the driest month in Simpson?

September is the month with the least rainfall. Rain falls for 8.3 days and accumulates 0.47" (12mm) of precipitation.

What is the least humid month in Simpson?

October is the least humid month in Simpson, with an average relative humidity of 71%.

What is the month with the shortest days in Simpson?

With an average of 9h and 38min of daylight, December has the shortest days of the year in Simpson.

Average pressure
Simpson, IL

Average pressure - Simpson, IL

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed
Simpson, IL

Average wind speed - Simpson, IL

The windiest months (with the highest average wind speed) are January and February (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity
Simpson, IL

Average humidity - Simpson, IL

The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (71%).

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Average rainfall
Simpson, IL

Average rainfall - Simpson, IL

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

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Average rainfall days
Simpson, IL

Average rainfall days - Simpson, IL

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

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Average snowfall
Simpson, IL

Average snowfall - Simpson, IL

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Simpson, IL

Average snowfall days - Simpson, IL

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Simpson, IL

Average daylight / Average sunshine - Simpson, IL

The month with the longest days is June (Average daylight: 14h and 43min).
The month with the shortest days is December (Average daylight: 9h and 38min).

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

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Average sunshine days
Simpson, IL

Average sunshine days - Simpson, IL

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

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Average UV index
Simpson, IL

Average UV index - Simpson, IL

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average visibility
Simpson, IL

Average visibility - Simpson, IL

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).

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