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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, like December, is another subzero cold winter month in Colchester, Illinois, with an average temperature ranging between max 31.1°F (-0.5°C) and min 19°F (-7.2°C). The coldest temperatures occur during January, when averages reach a peak of 31.1°F (-0.5°C) and a low of 19°F (-7.2°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Colchester, Illinois, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 36.1°F (2.3°C). The arrival of February brings an average high-temperature of an icy 36.1°F (2.3°C), subtly diverging from January's 31.1°F (-0.5°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Colchester, Illinois, with an average temperature ranging between max 49.6°F (9.8°C) and min 34.3°F (1.3°C). The arrival of March brings a temperature shift, with the average high-temperature escalating from a wintry 36.1°F (2.3°C) in February to a frosty 49.6°F (9.8°C). Weather in March »
Weather in April
April is a comfortable spring month in Colchester, Illinois, with an average temperature varying between 44.2°F (6.8°C) and 61.3°F (16.3°C). An increase in the average high-temperature marks April, moving from March's frosty 49.6°F (9.8°C) to a refreshing 61.3°F (16.3°C). Weather in April »
Weather in May
May, the last month of the spring in Colchester, is a pleasant month, with an average temperature ranging between min 54.9°F (12.7°C) and max 71.6°F (22°C). May brings an increase in the average high-temperature, progressing from an enjoyable 61.3°F (16.3°C) in April to a pleasant 71.6°F (22°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Colchester, Illinois, with temperature in the range of an average low of 63.7°F (17.6°C) and an average high of 80.4°F (26.9°C). The arrival of June brings a soft temperature shift, with the average high-temperature nudging from an agreeable 71.6°F (22°C) in May to a warm 80.4°F (26.9°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Colchester, Illinois, with an average temperature ranging between max 82.6°F (28.1°C) and min 66.2°F (19°C). July is Colchester's warmest month, registering average high temperatures of 82.6°F (28.1°C) and lows of 66.2°F (19°C). During July, the heat index is calculated to be a tropical 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Colchester, is also a moderately hot month, with an average temperature varying between 63.7°F (17.6°C) and 82°F (27.8°C). August's arrival brings an average high-temperature of a still moderately hot 82°F (27.8°C), demonstrating subtle variation from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Colchester, is still a warm month, with an average temperature fluctuating between 76.8°F (24.9°C) and 57.6°F (14.2°C). September reports an average high-temperature of a still warm 76.8°F (24.9°C), slightly varied from August's 82°F (27.8°C). Weather in September »
Weather in October
October, like September, in Colchester, Illinois, is another enjoyable autumn month, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 63°F (17.2°C). October's onset brings a reduction in the average high-temperature, from a warm 76.8°F (24.9°C) in September to a comfortable 63°F (17.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Colchester, Illinois, with an average temperature fluctuating between 49.1°F (9.5°C) and 34.7°F (1.5°C). As November begins, there is a decrease in the average high-temperature, falling from a refreshing 63°F (17.2°C) in October to a frosty 49.1°F (9.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Colchester, Illinois, with an average temperature ranging between min 25.9°F (-3.4°C) and max 37°F (2.8°C). The shift to December brings a decrease in the average high-temperature, falling from a chilly 49.1°F (9.5°C) in November to an icy 37°F (2.8°C). Weather in December »
Updated: Aug 24, 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 month is the coldest?
The lowest temperatures are recorded in January, with averages reaching a high of 31.1°F (-0.5°C) and a low of 19°F (-7.2°C).
How many days does it rain?
Throughout the year, there are 94.4 rainfall days, and 7.76" (197mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
When does it snow the most in Colchester?
January is the month with the most snowfall. Snow falls for 6.3 days and accumulates 0.67" (17mm) of snow.
How many days does it snow?
In Colchester, during the entire year, snow falls for 20.5 days and aggregates up to 2.44" (62mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.1h of sunshine.
When is the lowest UV index?
The month with the lowest UV index is January, with an average maximum UV index of 1.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Colchester, 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?
The month with the most rainfall is May, when the rain falls for 12.3 days and typically aggregates up to 1.1" (28mm) of precipitation.
When it does not snow?
In Colchester, snow does not fall in May through September.
When are the longest days?
June has the longest days of the year, with an average of 15h and 0min of daylight.
What are the months with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.2h of sunshine.
When is the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months?
July stands out as Colchester's warmest month, with temperatures ranging between an average high of 82.6°F (28.1°C) and a low of 66.2°F (19°C).
What is the most humid month in Colchester?
July is the most humid month, with an average relative humidity of 83%.
What is the least humid month?
October is the least humid month, with an average relative humidity of 71%.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 4.3 days and typically collects 0.35" (9mm) of precipitation.
What is the month with the shortest days in Colchester?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Colchester, IL
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (31.1°F).
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure
Colchester, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Colchester, IL
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.2mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Colchester, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Colchester, IL
- Average rainfall in January:
0.39" - Average rainfall in February:
0.39" - Average rainfall in March:
0.59" - Average rainfall in April:
0.79" - Average rainfall in May:
1.1" - Average rainfall in June:
0.83"
- Average rainfall in July:
0.67" - Average rainfall in August:
0.59" - Average rainfall in September:
0.87" - Average rainfall in October:
0.71" - Average rainfall in November:
0.47" - Average rainfall in December:
0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days
Colchester, IL
- Average rainfall days in January:
3.3 days - Average rainfall days in February:
3.6 days - Average rainfall days in March:
8.7 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
12.3 days - Average rainfall days in June:
11.8 days
- Average rainfall days in July:
10 days - Average rainfall days in August:
8.9 days - Average rainfall days in September:
7.7 days - Average rainfall days in October:
7.5 days - Average rainfall days in November:
5.4 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (3.3 days).
Average snowfall
Colchester, IL
The month with the highest snowfall is January (0.67").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Colchester, IL
- Average snowfall days in January:
6.3 days - Average snowfall days in February:
5.7 days - Average snowfall days in March:
2.3 days - Average snowfall days in April:
0.7 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:
0.3 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Colchester, IL
- Average daylight in January:
9h and 4min - 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 2min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 1min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Colchester, IL
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
20.5 days - Average sunshine days in March:
19.8 days - Average sunshine days in April:
17.5 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
13.9 days
- Average sunshine days in July:
15.3 days - Average sunshine days in August:
18.2 days - Average sunshine days in September:
20.4 days - Average sunshine days in October:
20.7 days - Average sunshine days in November:
21.8 days - Average sunshine days in December:
23.5 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is June (13.9 days).
Average UV index
Colchester, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Colchester, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Colchester, 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).
Colchester, Illinois, USA
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