Climate and monthly weather forecastJerseyville, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Jerseyville, Illinois, is a wintry winter month, with an average temperature ranging between min 22.6°F (-5.2°C) and max 35.6°F (2°C). Jerseyville's temperature records reveal January as the coldest month, marked by average highs of 35.6°F (2°C) and lows of 22.6°F (-5.2°C). Weather in January »Weather in February
The last month of the winter, February, is another cold month in Jerseyville, Illinois, with an average temperature varying between 40.6°F (4.8°C) and 26.4°F (-3.1°C). Jerseyville, Illinois, in February witnesses an average high-temperature of a still cold 40.6°F (4.8°C), indicating a slight variation from January's 35.6°F (2°C). Weather in February »Weather in March
The first month of the spring, March, is a cool month in Jerseyville, Illinois, with an average temperature fluctuating between 52.5°F (11.4°C) and 37°F (2.8°C). The shift into March brings an increase in the average high-temperature, moving from a wintry 40.6°F (4.8°C) in February to a fresh 52.5°F (11.4°C). Weather in March »Weather in April
April in Jerseyville, Illinois, is a comfortable spring month, with an average temperature fluctuating between 46.8°F (8.2°C) and 64.2°F (17.9°C). The shift into April is marked by a rise in the average high-temperature, moving from March's fresh 52.5°F (11.4°C) to a refreshing 64.2°F (17.9°C). Weather in April »Weather in May
May, the last month of the spring in Jerseyville, is a warm month, with an average temperature fluctuating between 56.7°F (13.7°C) and 73.9°F (23.3°C). As May arrives, a rise in the average high-temperature is observed, moving from a comfortable 64.2°F (17.9°C) in April to a warm 73.9°F (23.3°C). Weather in May »Weather in June
June, the first month of the summer in Jerseyville, is still a warm month, with an average temperature ranging between min 65.7°F (18.7°C) and max 82.8°F (28.2°C). June's arrival coincides with a marginal rise in the average high-temperature, moving from May's warm 73.9°F (23.3°C) to a still moderately hot 82.8°F (28.2°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Jerseyville, Illinois, with an average temperature varying between 84.7°F (29.3°C) and 67.6°F (19.8°C). Jerseyville's temperature records reveal July as the warmest month, marked by average highs of 84.7°F (29.3°C) and lows of 67.6°F (19.8°C). The heat index value during July is computed to be a fiery hot 96.8°F (36°C). Weather in July »Weather in August
August, the last month of the summer in Jerseyville, is another warm month, with an average temperature ranging between max 83.7°F (28.7°C) and min 65.5°F (18.6°C). The beginning of August reveals an average high-temperature of a still moderately hot 83.7°F (28.7°C), showing minimal deviation from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Jerseyville, is still a warm month, with an average temperature fluctuating between 59.4°F (15.2°C) and 78.4°F (25.8°C). September's advent presents an average high-temperature of a still warm 78.4°F (25.8°C), indicating a slight variation from the conditions of the previous month. Weather in September »Weather in October
October, like September, in Jerseyville, Illinois, is another comfortable autumn month, with an average temperature varying between 65.3°F (18.5°C) and 48.2°F (9°C). Jerseyville in October demonstrates a small temperature transition, adjusting from an average high of a warm 78.4°F (25.8°C) in September to a refreshing 65.3°F (18.5°C). Weather in October »Weather in November
November, the last month of the autumn in Jerseyville, is another cool month, with an average temperature ranging between max 51.8°F (11°C) and min 36.9°F (2.7°C). November's arrival coincides with a drop in the average high-temperature, decreasing from October's enjoyable 65.3°F (18.5°C) to a cool 51.8°F (11°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Jerseyville, Illinois, with an average temperature ranging between max 40.6°F (4.8°C) and min 29.3°F (-1.5°C). The onset of December is marked by a decrease in temperature, transitioning from a fresh 51.8°F (11°C) in November to a wintry 40.6°F (4.8°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
The coldest period in Jerseyville, Illinois, tends to be January, when average temperatures fluctuate between a high of 35.6°F (2°C) and a low of 22.6°F (-5.2°C).
The month with the least rainfall in Jerseyville is January, when the rain falls for 5.9 days and typically collects 1.06" (27mm) of precipitation.
Throughout the year, in Jerseyville, there are 136.5 rainfall days, and 23.11" (587mm) of precipitation is accumulated.
Months with snowfall in Jerseyville are January through March, November and December.
In Jerseyville, Illinois, during the entire year, snow falls for 20.9 days and aggregates up to 6.26" (159mm) of snow.
The month with the least sunshine is January, with an average of 4.5h of sunshine.
The months with the lowest UV index in Jerseyville are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall in Jerseyville. Snow falls for 5.9 days and accumulates 2.17" (55mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Jerseyville, 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 Jerseyville, Illinois, snow does not fall in April through October.
The months with the highest UV index in Jerseyville, Illinois, are May through August, with an average maximum UV index of 6.
The month with the most rainfall in Jerseyville, Illinois, is June, when the rain falls for 14.3 days and typically aggregates up to 3.07" (78mm) of precipitation.
June has the longest days of the year, with an average of 14h and 54min of daylight.
With an average of 10.4h of sunshine, June has the most sunshine of the year.
With average high temperatures of 84.7°F (29.3°C) and lows of 67.6°F (19.8°C), July is the warmest month in Jerseyville, Illinois.
The most humid month in Jerseyville, Illinois, is July, with an average relative humidity of 80%.
With an average relative humidity of 71%, October is the least humid month.
December has the shortest days of the year in Jerseyville, with an average of 9h and 30min of daylight.
Average temperature
Jerseyville, IL
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.6°F).
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure
Jerseyville, 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:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Jerseyville, IL
- Average wind speed in January:
9.6mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.4mph - Average wind speed in May:
7.6mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.3mph - Average wind speed in October:
8.2mph - Average wind speed in November:
9mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity
Jerseyville, IL
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Jerseyville, IL
- Average rainfall in January:
1.06" - Average rainfall in February:
1.18" - Average rainfall in March:
1.77" - Average rainfall in April:
2.64" - Average rainfall in May:
2.68" - Average rainfall in June:
3.07"
- Average rainfall in July:
2.32" - Average rainfall in August:
2.52" - Average rainfall in September:
1.57" - Average rainfall in October:
1.65" - Average rainfall in November:
1.34" - Average rainfall in December:
1.3"
The wettest month (with the highest rainfall) is June (3.07").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days
Jerseyville, IL
- Average rainfall days in January:
5.9 days - Average rainfall days in February:
6.7 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
14.1 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
15.9 days - Average rainfall days in August:
13 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (5.9 days).
Average snowfall
Jerseyville, IL
The month with the highest snowfall is February (2.17").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Jerseyville, IL
- Average snowfall days in January:
6.2 days - Average snowfall days in February:
5.9 days - Average snowfall days in March:
2.6 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:
1.5 days - Average snowfall days in December:
4.4 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Jerseyville, IL
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 30min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 30min - Average sunshine in May:
9h and 18min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 6min - Average sunshine in September:
9h and 30min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 54min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days
Jerseyville, IL
- Average sunshine days in January:
20.3 days - Average sunshine days in February:
16.2 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
14.3 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
13.1 days - Average sunshine days in August:
15.1 days - Average sunshine days in September:
16.6 days - Average sunshine days in October:
20.2 days - Average sunshine days in November:
18.9 days - Average sunshine days in December:
19.4 days
The month with the most sunshine days is January (20.3 days).
The months with the least sunshine days are May and June (12.3 days).
Average UV index
Jerseyville, 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, November and December (UV index 2).
Average cloud cover
Jerseyville, IL
The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are August and September (Cloud cover 28).
Average visibility
Jerseyville, 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).
