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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, the same as December, is another cold winter month in Fairfield, Illinois, with an average temperature ranging between min 25°F (-3.9°C) and max 37.8°F (3.2°C). January proves to be the coldest month, recording an average maximum temperature of 37.8°F (3.2°C) and a minimum temperature of 25°F (-3.9°C). Weather in January »
Weather in February
The last month of the winter, February, is also an icy month in Fairfield, Illinois, with an average temperature varying between 29.1°F (-1.6°C) and 42.6°F (5.9°C). The advent of February brings an average high-temperature of a still icy 42.6°F (5.9°C), exhibiting minor difference from the previous month. Weather in February »
Weather in March
March, the first month of the spring in Fairfield, is a fresh month, with an average temperature varying between 38.7°F (3.7°C) and 54.1°F (12.3°C). An upsurge in temperatures occurs as February gives way to March, with average highs shifting from an icy 42.6°F (5.9°C) to a cool 54.1°F (12.3°C). Weather in March »
Weather in April
April in Fairfield, Illinois, is an enjoyable spring month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 48.2°F (9°C). April marks a rise in the average high-temperature, moving from March's cool 54.1°F (12.3°C) to an enjoyable 64.9°F (18.3°C). Weather in April »
Weather in May
The last month of the spring, May, is a warm month in Fairfield, Illinois, with temperature in the range of an average high of 74.5°F (23.6°C) and an average low of 58.1°F (14.5°C). May indicates a change in the average high-temperature, moving up from a refreshing 64.9°F (18.3°C) in April to a warm 74.5°F (23.6°C). Weather in May »
Weather in June
The first month of the summer, June, is also a moderately hot month in Fairfield, Illinois, with an average temperature varying between 83.3°F (28.5°C) and 66.6°F (19.2°C). As May transitions into June, Fairfield notices a gentle rise in the average high-temperature, transitioning from a warm 74.5°F (23.6°C) to a still moderately hot 83.3°F (28.5°C). Weather in June »
Weather in July
July, like June, in Fairfield, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 67.6°F (19.8°C) and an average high of 85.1°F (29.5°C). July tends to be the warmest month, with temperatures averaging a daily high of 85.1°F (29.5°C) and a low of 67.6°F (19.8°C). During July, the heat index is computed to be a fiery hot 96.8°F (36°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Fairfield, Illinois, with an average temperature varying between 65.8°F (18.8°C) and 83.8°F (28.8°C). Upon the onset of August, Fairfield witnesses an average high-temperature of a still warm 83.8°F (28.8°C), showing a close resemblance to the prior month. Weather in August »
Weather in September
September, the first month of the autumn in Fairfield, is still a warm month, with an average temperature fluctuating between 79°F (26.1°C) and 60.4°F (15.8°C). September experiences an average high-temperature of a still moderately hot 79°F (26.1°C), barely different from August's 83.8°F (28.8°C). Weather in September »
Weather in October
October, like September, in Fairfield, Illinois, is another refreshing autumn month, with an average temperature ranging between max 66.7°F (19.3°C) and min 49.6°F (9.8°C). October brings a drop in Fairfield's average high-temperature, falling from a warm 79°F (26.1°C) in September to an enjoyable 66.7°F (19.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Fairfield, is also a fresh month, with an average temperature varying between 38.1°F (3.4°C) and 52.9°F (11.6°C). Arrival of November comes with a reduction in the average high-temperature, falling from a refreshing 66.7°F (19.3°C) in October to a fresh 52.9°F (11.6°C). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in Fairfield, Illinois, with an average temperature fluctuating between 43.2°F (6.2°C) and 31.1°F (-0.5°C). December's onset corresponds with a shift in the average high-temperature, moving from a fresh 52.9°F (11.6°C) in November to a chilly 43.2°F (6.2°C). Weather in December »
Updated: Jun 7, 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 time of the year is the coldest?
January proves to be the coldest month, recording an average maximum temperature of 37.8°F (3.2°C) and a minimum temperature of 25°F (-3.9°C).
How many days does it rain?
Throughout the year, there are 166.4 rainfall days, and 37.32" (948mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, November and December.
What is the snowiest month in Fairfield?
The months with the most snowfall are January and February, with an average 2.01" (51mm) of accumulated snow.
How much does it snow?
Throughout the year, there are 21.2 snowfall days, and 6.97" (177mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 4.4h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
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 wettest month?
April is the month with the most rainfall. Rain falls for 16.5 days and accumulates 4.96" (126mm) of precipitation.
What are the most humid months?
The months with the highest humidity are May and July, with an average relative humidity of 79%.
When it does not snow?
In Fairfield, Illinois, snow does not fall in May through October.
What are the months with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
June has the longest days of the year, with an average of 14h and 48min of daylight.
What month has the most sunshine?
June has the most sunshine of the year, with an average of 10.5h of sunshine.
What is the hottest time of year in Fairfield?
July, with average temperatures reaching a high of 85.1°F (29.5°C) and a low of 67.6°F (19.8°C), is the warmest month.
What is the driest month?
The month with the least rainfall is September, when the rain falls for 13.5 days and typically collects 2.05" (52mm) of precipitation.
What is the least humid month?
With an average relative humidity of 70%, October is the least humid month.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Fairfield, IL
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (37.8°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 (25°F).
Average pressure
Fairfield, 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:
29.95"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:
30.04"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
Fairfield, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.9mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
6mph - Average wind speed in September:
6.7mph - Average wind speed in October:
8.4mph - Average wind speed in November:
8.9mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity
Fairfield, IL
The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Fairfield, IL
- Average rainfall in January:
2.44" - Average rainfall in February:
2.32" - Average rainfall in March:
3.23" - Average rainfall in April:
4.96" - Average rainfall in May:
4.13" - Average rainfall in June:
3.94"
The wettest month (with the highest rainfall) is April (4.96").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days
Fairfield, IL
- Average rainfall days in January:
8.7 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
15.3 days - Average rainfall days in April:
16.5 days - Average rainfall days in May:
19.8 days - Average rainfall days in June:
17.1 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
15.6 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
11 days - Average rainfall days in December:
10.9 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.7 days).
Average snowfall
Fairfield, IL
The months with the highest snowfall are January and February (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Fairfield, IL
- Average snowfall days in January:
6.7 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
0.4 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:
0.2 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
4.1 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Fairfield, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - 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:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 3min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 3min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 1min - Average sunshine in October:
6h and 4min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days
Fairfield, IL
- Average sunshine days in January:
16.1 days - Average sunshine days in February:
13.1 days - Average sunshine days in March:
13.5 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
9 days - Average sunshine days in June:
9.5 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
17.9 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
17.6 days
The month with the most sunshine days is October (17.9 days).
The month with the least sunshine days is May (9 days).
Average UV index
Fairfield, 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
Fairfield, IL
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility
Fairfield, 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).
Fairfield, Illinois, USA
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