Climate and monthly weather forecastFarmington, IL
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Farmington, Illinois, with an average temperature varying between 18.3°F (-7.6°C) and 30.4°F (-0.9°C). The coldest period tends to be January, when average temperatures fluctuate between a high of 30.4°F (-0.9°C) and a low of 18.3°F (-7.6°C). Weather in January »Weather in February
February, the last month of the winter in Farmington, is a cold month, with an average temperature varying between 35.2°F (1.8°C) and 22.3°F (-5.4°C). Transitioning into February, Farmington records an average high-temperature of a wintry 35.2°F (1.8°C), almost identical to January's 30.4°F (-0.9°C). Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Farmington, Illinois, with an average temperature varying between 48.6°F (9.2°C) and 33.6°F (0.9°C). The shift from February to March brings an increase in the average high-temperature, moving from an icy 35.2°F (1.8°C) to a frosty 48.6°F (9.2°C). Weather in March »Weather in April
April in Farmington, Illinois, is a refreshing spring month, with temperature in the range of an average low of 44.2°F (6.8°C) and an average high of 60.4°F (15.8°C). Farmington's weather in April shows a rise in the average high-temperature, moving up from March's frosty 48.6°F (9.2°C) to a mild 60.4°F (15.8°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Farmington, Illinois, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 71.4°F (21.9°C). A shift in the average high-temperature is noticeable in May, changing from a refreshing 60.4°F (15.8°C) in April to a pleasant 71.4°F (21.9°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Farmington, Illinois, with an average temperature varying between 63.1°F (17.3°C) and 79.9°F (26.6°C). Farmington, Illinois, observes a slight ascent in average high-temperatures during June, adjusting from a pleasant 71.4°F (21.9°C) in May to a warm 79.9°F (26.6°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Farmington, Illinois, with an average temperature fluctuating between 65.1°F (18.4°C) and 82°F (27.8°C). July, with an average high of 82°F (27.8°C) and a low of 65.1°F (18.4°C), signifies the warmest month of the year. The heat index for July is appraised at a tropical 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Farmington, is also a moderately hot month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 63.3°F (17.4°C). The transition from July to August sees average high-temperatures adjusting to a still warm 81.1°F (27.3°C), from a not significantly different 82°F (27.8°C). Weather in August »Weather in September
September, the first month of the autumn in Farmington, is still a warm month, with an average temperature ranging between min 57°F (13.9°C) and max 76.3°F (24.6°C). With the transition into September, Farmington notes an average high-temperature of a still moderately hot 76.3°F (24.6°C), closely resembling August. Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in Farmington, Illinois, with temperature in the range of an average high of 62.1°F (16.7°C) and an average low of 46°F (7.8°C). Onset of October witnesses a reduction in the average high-temperature, falling from a moderately hot 76.3°F (24.6°C) in September to a comfortable 62.1°F (16.7°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Farmington, Illinois, with an average temperature ranging between min 34.2°F (1.2°C) and max 48°F (8.9°C). With November's arrival, Farmington's weather changes as the average high-temperature falls from a refreshing 62.1°F (16.7°C) in October to a chilly 48°F (8.9°C). Weather in November »Weather in December
December, the first month of the winter in Farmington, is also an icy month, with an average temperature fluctuating between 36.5°F (2.5°C) and 25.7°F (-3.5°C). Farmington's transition into December involves a shift in temperature, receding from a frosty 48°F (8.9°C) in November to a cold 36.5°F (2.5°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
Farmington's January weather, with an average high temperature of 30.4°F (-0.9°C) and an average low temperature of 18.3°F (-7.6°C), tends to be the coldest of the year.
In Farmington, during the entire year, the rain falls for 145.3 days and collects up to 28.62" (727mm) of precipitation.
Months with snowfall in Farmington, Illinois, are January through April, October through December.
January is the month with the most snowfall in Farmington. Snow falls for 10.6 days and accumulates 3.78" (96mm) of snow.
Throughout the year, in Farmington, Illinois, there are 30.9 snowfall days, and 11.3" (287mm) of snow is accumulated.
With an average of 4h of sunshine, January has the least sunshine of the year in Farmington, Illinois.
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
February and December are months with the least rain in Farmington when the rain falls for 5.8 days and typically aggregates up to 1.42" (36mm) of rain.
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.
The month with the most rainfall in Farmington, Illinois, is May, when the rain falls for 18 days and typically aggregates up to 4.29" (109mm) of precipitation.
In Farmington, snow does not fall in May through September.
June has the longest days of the year, with an average of 15h and 0min of daylight.
With an average of 10.2h of sunshine, June has the most sunshine of the year.
June and July, with an average maximum UV index of 6, are months with the highest UV index in Farmington.
In Farmington, the peak average temperatures are observed in July, with a high of 82°F (27.8°C) and a low of 65.1°F (18.4°C).
With an average relative humidity of 84%, July is the most humid month in Farmington.
With an average relative humidity of 72%, October is the least humid month.
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Farmington, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (30.4°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure
Farmington, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"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:
30.01"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Farmington, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.3mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Farmington, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Farmington, IL
- Average rainfall in January:
1.46" - Average rainfall in February:
1.42" - Average rainfall in March:
2.13" - Average rainfall in April:
3.5" - Average rainfall in May:
4.29" - Average rainfall in June:
3.07"
- Average rainfall in July:
2.4" - Average rainfall in August:
1.89" - Average rainfall in September:
2.48" - Average rainfall in October:
2.83" - Average rainfall in November:
1.73" - Average rainfall in December:
1.42"
The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.42").
Average rainfall days
Farmington, IL
- Average rainfall days in January:
6.1 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
12.3 days - Average rainfall days in April:
16.1 days - Average rainfall days in May:
18 days - Average rainfall days in June:
16.6 days
- Average rainfall days in July:
17.1 days - Average rainfall days in August:
13.7 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Farmington, IL
The month with the highest snowfall is January (3.78").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Farmington, IL
- Average snowfall days in January:
10.6 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
3.1 days - Average snowfall days in April:
1 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:
1.8 days - Average snowfall days in December:
6 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Farmington, IL
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
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 0min - Average sunshine in February:
4h and 18min - Average sunshine in March:
6h and 36min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 18min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Farmington, IL
- Average sunshine days in January:
15.4 days - Average sunshine days in February:
14.7 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
11.6 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
11.3 days
- Average sunshine days in July:
12.1 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
16.8 days - Average sunshine days in October:
17.3 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
17.8 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index
Farmington, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Farmington, 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
Farmington, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
