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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 Andover, Illinois, with temperature in the range of an average high of 28.2°F (-2.1°C) and an average low of 16.5°F (-8.6°C). Temperature readings reach their annual highs in January, averaging 28.2°F (-2.1°C) and a minimum average of 16.5°F (-8.6°C). Weather in January »
Weather in February
The last month of the winter, February, is a wintry month in Andover, Illinois, with an average temperature varying between 33.3°F (0.7°C) and 20.3°F (-6.5°C). As January transitions into February, Andover records an average high-temperature of a wintry 33.3°F (0.7°C), showing a gentle shift from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Andover, is a frosty month, with an average temperature varying between 47.1°F (8.4°C) and 32.4°F (0.2°C). Andover in March shows a temperature shift, moving from an average high of a cold 33.3°F (0.7°C) in February to a chilly 47.1°F (8.4°C). Weather in March »
Weather in April
April is a moderate spring month in Andover, Illinois, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 59.2°F (15.1°C). April brings a rise in Andover's average high-temperature, moving from a frosty 47.1°F (8.4°C) in March to a mild 59.2°F (15.1°C). Weather in April »
Weather in May
May, the last month of the spring in Andover, is an agreeable month, with an average temperature varying between 70.7°F (21.5°C) and 53.4°F (11.9°C). With the onset of May, Andover sees a temperature rise, with the average high-temperature moving from April's mild 59.2°F (15.1°C) to an agreeable 70.7°F (21.5°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Andover, Illinois, with an average temperature varying between 78.8°F (26°C) and 62.2°F (16.8°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's agreeable 70.7°F (21.5°C) to a moderately hot 78.8°F (26°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Andover, Illinois, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64.9°F (18.3°C). Andover reaches its highest average temperatures in July, measuring 81.1°F (27.3°C) at the peak and 64.9°F (18.3°C) at the lowest. July's mean heat index is calculated to be a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Andover, is also a moderately hot month, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 80.2°F (26.8°C). August's climate shows a minor adjustment in average high-temperatures to a still moderately hot 80.2°F (26.8°C) from July's 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Andover, Illinois, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 75.4°F (24.1°C). The transition into September notes an average high-temperature of a still moderately hot 75.4°F (24.1°C), revealing a mild distinction from the 80.2°F (26.8°C) in August. Weather in September »
Weather in October
October, like September, in Andover, Illinois, is another comfortable autumn month, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 45.5°F (7.5°C). Andover's October weather comes with a decrease in average high-temperatures, moving from a moderately hot 75.4°F (24.1°C) in September to a comfortable 61.3°F (16.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Andover, Illinois, with temperature in the range of an average high of 46.9°F (8.3°C) and an average low of 33.3°F (0.7°C). November signals a considerable drop in Andover's average high-temperature, reducing from a comfortable 61.3°F (16.3°C) in October to a frosty 46.9°F (8.3°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Andover, Illinois, with an average temperature varying between 24.1°F (-4.4°C) and 34.7°F (1.5°C). With the beginning of December, the average high-temperature shows a decrease, transitioning from a frosty 46.9°F (8.3°C) in November to a wintry 34.7°F (1.5°C). Weather in December »
Updated: Jul 28, 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?
With an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 16.5°F (-8.6°C), January is the coldest month.
How many days does it rain?
Throughout the year, there are 127.7 rainfall days, and 17.8" (452mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 10.5 days and accumulates 2.17" (55mm) of snow.
How many days does it snow?
In Andover, during the entire year, snow falls for 35.5 days and aggregates up to 7.95" (202mm) of snow.
What is the month with the least sunshine in Andover?
January has the least sunshine of the year, with an average of 4h of sunshine.
What is the month with the lowest UV index?
January is the month with the lowest UV index, 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, 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 rainiest month?
The month with the most rainfall is May, when the rain falls for 16.5 days and typically aggregates up to 2.76" (70mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days in Andover?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the month with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.1h of sunshine.
When is the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What is the hottest time of year?
July is the month when Andover experiences its warmest temperatures, averaging a high of 81.1°F (27.3°C) and a low of 64.9°F (18.3°C).
What is the most humid month?
With an average relative humidity of 84%, July is the most humid month.
What is the least humid month?
With an average relative humidity of 72%, October is the least humid month.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 0.71" (18mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Andover, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.2°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure
Andover, IL
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"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:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Andover, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9.1mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Andover, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Andover, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
0.94" - Average rainfall in March:
1.14" - Average rainfall in April:
2.2" - Average rainfall in May:
2.76" - Average rainfall in June:
2.01"
- Average rainfall in July:
1.89" - Average rainfall in August:
1.42" - Average rainfall in September:
1.26" - Average rainfall in October:
1.69" - Average rainfall in November:
1.02" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days
Andover, IL
- Average rainfall days in January:
4 days - Average rainfall days in February:
4.7 days - Average rainfall days in March:
10.6 days - Average rainfall days in April:
14.1 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
14.7 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
9.9 days - Average rainfall days in October:
11 days - Average rainfall days in November:
7.7 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (4 days).
Average snowfall
Andover, IL
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Andover, IL
- Average snowfall days in January:
10.5 days - Average snowfall days in February:
8.7 days - Average snowfall days in March:
4.4 days - Average snowfall days in April:
1.5 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:
0.6 days - Average snowfall days in November:
2.4 days - Average snowfall days in December:
7.4 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Andover, 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 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - 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 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - 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 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Andover, IL
- Average sunshine days in January:
16.8 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
16 days - Average sunshine days in April:
13.2 days - Average sunshine days in May:
11.6 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
11.2 days - Average sunshine days in August:
13.5 days - Average sunshine days in September:
18 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
19.7 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).
Average UV index
Andover, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Andover, IL
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility
Andover, IL
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
Andover, Illinois, USA
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