Climate and monthly weather forecastSimpson, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Simpson, Illinois, with an average temperature fluctuating between 40.1°F (4.5°C) and 27°F (-2.8°C). The month of January, characterized by an average high of 40.1°F (4.5°C) and a low of 27°F (-2.8°C), is recognized as the coldest. Weather in January »Weather in February
February, the last month of the winter in Simpson, is a chilly month, with an average temperature varying between 30.7°F (-0.7°C) and 45.1°F (7.3°C). As Simpson transitions from January to February, the average high-temperatures adjust to a frosty 45.1°F (7.3°C), nearly the same as the previous 40.1°F (4.5°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). With the arrival of March, the average high-temperature transitions 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 in Simpson, Illinois, is a comfortable spring month, with an average temperature varying between 66.6°F (19.2°C) and 48.9°F (9.4°C). Simpson's April weather shows an increase in high-temperatures, moving from March's refreshing 55.8°F (13.2°C) to a comfortable 66.6°F (19.2°C). Weather in April »Weather in May
The last month of the spring, May, is a warm month in Simpson, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 75.7°F (24.3°C). May's onset witnesses a shift in the average high-temperature, moving from a refreshing 66.6°F (19.2°C) in April to a warm 75.7°F (24.3°C). Weather in May »Weather in June
June, the first month of the summer in Simpson, is still a warm month, with an average temperature fluctuating between 66.2°F (19°C) and 85.6°F (29.8°C). June signals a shift in the average high-temperature, moving from May's 75.7°F (24.3°C) to a still moderately hot 85.6°F (29.8°C). Weather in June »Weather in July
July in Simpson, Illinois, is a tropical summer month, with temperature in the range of an average low of 68.5°F (20.3°C) and an average high of 88°F (31.1°C). July is the month when Simpson experiences its warmest temperatures, averaging a high of 88°F (31.1°C) and a low of 68.5°F (20.3°C). For most parts of July, the heat index is evaluated at a blisteringly 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 temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 86.5°F (30.3°C). The arrival of August coincides with an average high-temperature of a still tropical 86.5°F (30.3°C), indicating a minimal shift from July's 88°F (31.1°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Simpson, Illinois, with an average temperature varying between 60.6°F (15.9°C) and 81.1°F (27.3°C). September's arrival subtly correlates with a reduction in the average high-temperature, down 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, the same as September, is another comfortable autumn month in Simpson, Illinois, with an average temperature ranging between min 49.6°F (9.8°C) and max 67.8°F (19.9°C). Arrival of October comes with a reduction in the average high-temperature, falling from a warm 81.1°F (27.3°C) in September to an enjoyable 67.8°F (19.9°C). Weather in October »Weather in November
November, the last month of the autumn in Simpson, is also a fresh month, with temperature in the range of an average low of 38.8°F (3.8°C) and an average high of 54.5°F (12.5°C). Transition into November marks a drop in the average high-temperature, moving 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 ranging between max 44.8°F (7.1°C) and min 32.7°F (0.4°C). The arrival of December corresponds with a reduction in the average high-temperature, down from November's cool 54.5°F (12.5°C) to a chilly 44.8°F (7.1°C). 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
Simpson's coldest month, January, generally records average temperatures ranging from a high of 40.1°F (4.5°C) to a low of 27°F (-2.8°C).
In Simpson, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.
Months with snowfall in Simpson are January through March, November and December.
In Simpson, during the entire year, snow falls for 11 days and aggregates up to 1.57" (40mm) of snow.
The months with the least sunshine are January and February, with an average of 4.6h of sunshine.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Simpson, Illinois.
February is the month with the most snowfall in Simpson. Snow falls for 3.2 days and accumulates 0.67" (17mm) of snow.
March and May, with an average relative humidity of 79%, are most humid months.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Simpson, Illinois, 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.
In Simpson, Illinois, snow does not fall in April through October.
The months with the highest UV index in Simpson are May through August, with an average maximum UV index of 6.
The month with the most rainfall in Simpson is June, when the rain falls for 12.5 days and typically aggregates up to 1.5" (38mm) of precipitation.
With an average of 14h and 42min of daylight, June has the longest days of the year in Simpson.
The months with the most sunshine in Simpson are June and July, with an average of 10.4h of sunshine.
During the warmest month in Simpson, July, temperatures average a high of 88°F (31.1°C) and a low of 68.5°F (20.3°C).
September is the month with the least rainfall in Simpson, Illinois. Rain falls for 8.3 days and accumulates 0.47" (12mm) of precipitation.
October is the least humid month, with an average relative humidity of 71%.
The month with the shortest days in Simpson, Illinois, is December, with an average of 9h and 36min of daylight.
Average temperature
Simpson, IL
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure
Simpson, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed
Simpson, IL
- Average wind speed in January:
9mph - Average wind speed in February:
9mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.7mph - Average wind speed in September:
6.3mph - Average wind speed in October:
7.6mph - Average wind speed in November:
8.2mph - Average wind speed in December:
8.5mph
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).
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%).
Average rainfall
Simpson, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
1.14" - Average rainfall in March:
1.22" - Average rainfall in April:
1.22" - Average rainfall in May:
1.34" - Average rainfall in June:
1.5"
- Average rainfall in July:
1.42" - Average rainfall in August:
1.3" - Average rainfall in September:
0.47" - Average rainfall in October:
0.98" - Average rainfall in November:
0.91" - Average rainfall in December:
0.79"
The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").
Average rainfall days
Simpson, IL
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
11.6 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
12.7 days - Average rainfall days in June:
12.5 days
- Average rainfall days in July:
13.1 days - Average rainfall days in August:
11.9 days - Average rainfall days in September:
8.3 days - Average rainfall days in October:
7.5 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
7.3 days
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).
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").
Average snowfall days
Simpson, IL
- Average snowfall days in January:
3.3 days - Average snowfall days in February:
3.2 days - Average snowfall days in March:
1.3 days - Average snowfall days in April:
0.2 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:
1 days - Average snowfall days in December:
1.9 days
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).
Average daylight / Average sunshine
Simpson, IL
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 24min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 36min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 30min - Average sunshine in May:
9h and 6min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 24min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 48min
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).
Average sunshine days
Simpson, IL
- Average sunshine days in January:
21.4 days - Average sunshine days in February:
17.5 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
16.7 days - Average sunshine days in May:
15.3 days - Average sunshine days in June:
14.8 days
- Average sunshine days in July:
15.1 days - Average sunshine days in August:
16.3 days - Average sunshine days in September:
19.1 days - Average sunshine days in October:
21.5 days - Average sunshine days in November:
20.8 days - Average sunshine days in December:
21.2 days
The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).
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).
Average cloud cover
Simpson, IL
The months with the most cloud cover are January and February (Cloud cover 51).
The month with the least cloud cover is September (Cloud cover 28).
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).
