Climate and monthly weather forecastFrederick, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Frederick, Illinois, is a wintry winter month, with an average temperature ranging between max 32.7°F (0.4°C) and min 20.5°F (-6.4°C). January stands out as Frederick's coldest month, with temperatures ranging between an average high of 32.7°F (0.4°C) and a low of 20.5°F (-6.4°C). Weather in January »Weather in February
The last month of the winter, February, is also a wintry month in Frederick, Illinois, with temperature in the range of an average low of 24.3°F (-4.3°C) and an average high of 37.9°F (3.3°C). The beginning of February records an average high-temperature of a still icy 37.9°F (3.3°C), almost echoing the conditions of the previous month. Weather in February »Weather in March
March, the first month of the spring in Frederick, is a fresh month, with temperature in the range of an average low of 35.2°F (1.8°C) and an average high of 51.3°F (10.7°C). An escalation in the average high-temperature is seen with the onset of March, moving from a cold 37.9°F (3.3°C) in February to a fresh 51.3°F (10.7°C). Weather in March »Weather in April
April is a comfortable spring month in Frederick, Illinois, with an average temperature ranging between min 45.9°F (7.7°C) and max 63.1°F (17.3°C). An increase in the average high-temperature marks April, moving from March's cool 51.3°F (10.7°C) to an enjoyable 63.1°F (17.3°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Frederick, Illinois, with an average temperature varying between 72.7°F (22.6°C) and 55.9°F (13.3°C). The onset of May marks an increase in the average high-temperature, moving from a comfortable 63.1°F (17.3°C) in April to an agreeable 72.7°F (22.6°C). Weather in May »Weather in June
June, the first month of the summer in Frederick, is a warm month, with an average temperature ranging between max 81°F (27.2°C) and min 64°F (17.8°C). The arrival of June brings a soft temperature shift, with the average high-temperature nudging from a pleasant 72.7°F (22.6°C) in May to a moderately hot 81°F (27.2°C). Weather in June »Weather in July
July, like June, in Frederick, Illinois, is another warm summer month, with an average temperature ranging between max 83.3°F (28.5°C) and min 66.6°F (19.2°C). Temperature readings reach their annual highs in July, averaging 83.3°F (28.5°C) and a minimum average of 66.6°F (19.2°C). July's mean heat index is computed to be a tropical 93.2°F (34°C). Weather in July »Weather in August
August, the last month of the summer in Frederick, is also a moderately hot month, with an average temperature fluctuating between 64.4°F (18°C) and 83.1°F (28.4°C). Frederick registers an average high-temperature of a still moderately hot 83.1°F (28.4°C) at the commencement of August, closely related to the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Frederick, Illinois, with an average temperature ranging between min 58.5°F (14.7°C) and max 77.9°F (25.5°C). The arrival of September brings an average high-temperature of a still warm 77.9°F (25.5°C), nearly identical to August's 83.1°F (28.4°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Frederick, Illinois, with temperature in the range of an average low of 47.3°F (8.5°C) and an average high of 63.9°F (17.7°C). The onset of October is marked by a decrease in temperature, transitioning from a moderately hot 77.9°F (25.5°C) in September to an enjoyable 63.9°F (17.7°C). Weather in October »Weather in November
November, the last month of the autumn in Frederick, is also a fresh month, with an average temperature ranging between min 35.8°F (2.1°C) and max 50.4°F (10.2°C). Frederick's weather in November involves a decrease in the average high-temperature, moving down from October's enjoyable 63.9°F (17.7°C) to a fresh 50.4°F (10.2°C). Weather in November »Weather in December
December, the first month of the winter in Frederick, is also a wintry month, with temperature in the range of an average high of 38.7°F (3.7°C) and an average low of 27.5°F (-2.5°C). Frederick's transition into December involves a shift in temperature, receding from a cool 50.4°F (10.2°C) in November to a cold 38.7°F (3.7°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
Temperature records mark January as the coldest month, with highs averaging 32.7°F (0.4°C) and lows at 20.5°F (-6.4°C).
In Frederick, during the entire year, the rain falls for 142.2 days and collects up to 27.95" (710mm) of precipitation.
January through April, October through December are months with snowfall in Frederick.
The month with the most snowfall in Frederick is January, when snow falls for 10.1 days and typically aggregates up to 4.21" (107mm) of snow.
In Frederick, Illinois, during the entire year, snow falls for 31.2 days and aggregates up to 11.85" (301mm) of snow.
January has the least sunshine of the year in Frederick, with an average of 4.2h of sunshine.
The months with the lowest UV index in Frederick are January, February, November and December, with an average maximum UV index of 2.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Frederick, 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 Frederick, Illinois, is May, when the rain falls for 17.9 days and typically aggregates up to 3.62" (92mm) of precipitation.
In Frederick, Illinois, snow does not fall in May through September.
June has the longest days of the year in Frederick, with an average of 15h and 0min of daylight.
June and July, with an average of 10.2h of sunshine, are months with the most sunshine in Frederick, Illinois.
The months with the highest UV index in Frederick, Illinois, are June through August, with an average maximum UV index of 6.
July is the month when Frederick's temperatures reach their peak, with averages of 83.3°F (28.5°C) and lows of 66.6°F (19.2°C).
The most humid month in Frederick is July, with an average relative humidity of 82%.
October is the least humid month, with an average relative humidity of 71%.
December is the month with the least rainfall in Frederick. Rain falls for 8.6 days and accumulates 1.61" (41mm) of precipitation.
The month with the shortest days in Frederick, Illinois, is December, with an average of 9h and 24min of daylight.
Average temperature
Frederick, IL
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (32.7°F).
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).
Average pressure
Frederick, 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:
29.91"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:
30.02"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 (29.91"Hg).
Average wind speed
Frederick, IL
- Average wind speed in January:
10.1mph - Average wind speed in February:
10.1mph - Average wind speed in March:
9.9mph - Average wind speed in April:
10.1mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.6mph
The windiest months (with the highest average wind speed) are January, February and April (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity
Frederick, IL
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Frederick, IL
- Average rainfall in January:
1.73" - Average rainfall in February:
1.73" - Average rainfall in March:
2.4" - Average rainfall in April:
3.27" - Average rainfall in May:
3.62" - Average rainfall in June:
2.91"
- Average rainfall in July:
2.09" - Average rainfall in August:
2.05" - Average rainfall in September:
2.28" - Average rainfall in October:
2.4" - Average rainfall in November:
1.85" - Average rainfall in December:
1.61"
The wettest month (with the highest rainfall) is May (3.62").
The driest month (with the least rainfall) is December (1.61").
Average rainfall days
Frederick, IL
- Average rainfall days in January:
7 days - Average rainfall days in February:
6.8 days - Average rainfall days in March:
13.7 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
17.9 days - Average rainfall days in June:
15.4 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
12.7 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
8.6 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (6.8 days).
Average snowfall
Frederick, IL
The month with the highest snowfall is January (4.21").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Frederick, IL
- Average snowfall days in January:
10.1 days - Average snowfall days in February:
8.1 days - Average snowfall days in March:
3.8 days - Average snowfall days in April:
0.8 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:
1.9 days - Average snowfall days in December:
6.3 days
The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Frederick, 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 24min - 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:
10h and 0min - Average daylight in December:
9h and 24min
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 24min).
- Average sunshine in January:
4h and 12min - Average sunshine in February:
4h and 24min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 6min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 24min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 42min
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 12min).
Average sunshine days
Frederick, IL
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
13.5 days - Average sunshine days in March:
13.6 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
10.9 days - Average sunshine days in June:
11 days
- Average sunshine days in July:
13.1 days - Average sunshine days in August:
16.7 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
18.7 days - Average sunshine days in November:
18.3 days - Average sunshine days in December:
17.2 days
The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is May (10.9 days).
Average UV index
Frederick, IL
The months with the highest UV index are 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
Frederick, IL
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility
Frederick, IL
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
