Climate and monthly weather forecastWheaton, IL
Climate and monthly weather forecast
The climate of Wheaton
Set within the Midwest of the United States in the state of Illinois, Wheaton features a Dfa - Humid Continental climate classification according to Köppen climatic zones. Essentially, this climate type is characterized by no dry season with hot summers bringing an inviting contrast to the cold winters.Throughout the year, there's a significant variation in the temperature spectrum of Wheaton, Illinois. The highest temperatures are enjoyed in the summer months with averages reaching the peak of 81.7°F (27.6°C) in July, while the coldest averages are experienced in the heart of winter, dipping to a chilly 16.7°F (-8.5°C) in January.
A diversity is certainly prevalent when discussing the humidity levels of Wheaton. Levels fluctuate from 73% in October to a high of 83% in the beginning months of the year, January and February. Precipitation in the area spreads fairly equally throughout the year but is most frequent during the summer months, reaching its highest point in May with 4.45" (113mm) of rain. The sun shines brightest during high summer, with July and August boasting 9.8 to 9.9 hours of light-beaming days on average.
Unique weather conditions in Wheaton are surely represented by the snowfall. Although this weather phenomenon nearly disappears from May to September, snow showers highlight some months, with January displaying the heaviest snowfall reaching up to 5.87" (149mm).
The Best Time to Visit Wheaton
Visitors who appreciate warm weather should aim for a visit between June and August. The temperatures in these months comfortably sit within the range of 78.1°F (25.6°C) to 81.7°F (27.6°C). Additionally, these months also provide the longest daylight hours, amounting to 14.6 to 15.2 hours.For those enamored by the sight of snowfall, January or February would be the ideal time to visit, given that these months encompass the majority of Wheaton's snowfall with 5.87" (149mm) and 5.12" (130mm) respectively.
The Worst Time to Visit Wheaton
January represents the coldest month in Wheaton with an average low temperature of 16.7°F (-8.5°C). Alongside this, it’s the month that witnesses the heaviest snowfall which could diminish outdoor activities. Hence it is not ideal for those who are not winter enthusiasts.Spring Weather in Wheaton
When spring steps in from March to May, Wheaton experiences mild climatic conditions. The average high temperature escalates from 45°F (7.2°C) in March to reach 68.5°F (20.3°C) in May. Rainfall during this period registers from 1.97 to 4.45" (113mm). This season has the most rain, topping at an average of 19.2 days in May. Overall, it is a season that merges blooming nature with a refreshing climate.Summer Weather in Wheaton
Summers in Wheaton, from June to August, are relatively warm with average high temperatures hitting between 78.1°F (25.6°C) and 81.7°F (27.6°C). Sunshine lasts from 8.5 to 9.8 hours and days are the longest of the year, offering abundant daylight from 14.9 to 15.2 hours. Rain occurs frequently; June sees the highest average rain with 4.29" (109mm). All the while, relative humidity ranges from 78% to 78%.Autumn Weather in Wheaton
Autumn brings mellow weather in Wheaton between September and November. The average high temperature retreats from 73.6°F (23.1°C) to 45.5°F (7.5°C) as the season progresses. Rainfall lessens to 2.48" (63mm) in September before rising slightly to 2.83" (72mm) in October. September also hosts the highest temperature of the season while November welcomes the first snow of the season with 1.65" (42mm).Winter Weather in Wheaton
Winters in Wheaton from December through to February are notable for their significant chill. The average high temperature fluctuates from 34.3°F (1.3°C) to 28°F (-2.2°C) while the average low temperature drifts between 24.3°F (-4.3°C) and 16.7°F (-8.5°C). Snow is a regular feature with February displaying up to 5.12" (130mm). These months also have the shortest sunlight period, ranging from 9.2 hours in December and dwindling further to 9.5 hours in January. Although winter may be bitter and layered in snow, its idyllic winter scenes create a beautiful and serene atmosphere.Weather in January
Cold temperatures are the hallmark of Wheaton’s January weather. The temperature fluctuates between a chilling 28°F (-2.2°C) and a colder 16.7°F (-8.5°C), making it the coldest month of the year. The inclement weather extends to high snowfall levels, with residents experiencing a majority of the yearly snowfall this month. Weather in January »Weather in February
February, the last month of the winter in Wheaton, is a wintry month, with an average temperature fluctuating between 32.2°F (0.1°C) and 19.8°F (-6.8°C). The initiation of February sees an average high-temperature of an icy 32.2°F (0.1°C), showing minor variations from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Wheaton, Illinois, with an average temperature varying between 30.7°F (-0.7°C) and 45°F (7.2°C). Wheaton's transition into March sees a rise in the average high-temperature, advancing from an icy 32.2°F (0.1°C) in February to a chilly 45°F (7.2°C). Weather in March »Weather in April
April in Wheaton is known for a significant rise in temperatures, high rainfall, and longer daylight hours. It features an apparent spike in rainfall, with 3.78" (96mm), ushering in the refreshing showers of springtime. As the temperatures steer clear of the freezing point, snowfall ceases. Weather in April »Weather in May
May sees the full bloom of spring in Wheaton, with warmer temperatures and increasingly longer days. It marks the break from the cold weather, as temperatures range in the more pleasant high 60s°F. Sunlight envelopes most of the day, and a significant increase in UV index is noted. Weather in May »Weather in June
June in Wheaton signals the start of summer, with hot temperatures and extended daylight hours. June experiences the highest UV index of 6, necessitating sun protection gear during outdoor activities. Rainfall in June remains slightly lesser than in May. Weather in June »Weather in July
The peak of summer arrives in Wheaton in July. This month records the highest temperatures, ranging from 81.7°F (27.6°C) to 65.3°F (18.5°C). Relative humidity levels and daylight hours pretty much maintain the trend set in June. Weather in July »Weather in August
August in Wheaton remains in the throes of summer with high temperatures, though there is a subtle drop from July. Rainfall diminishes by a small fraction, signaling the gradual end of the wet season. The beginning of the month usually enjoys long daylight hours, gradually decreasing towards the end of the month. Weather in August »Weather in September
The arrival of autumn is noticeable in the September weather of Wheaton. A marked decrease occurs in temperature, taking a dip from summer's highs into the 70s°F. Rainfall continues to decrease from August, and September ranks the lowest in terms of rainfall quantity. Weather in September »Weather in October
October in Wheaton is characterized by cooling temperatures, colorful fall foliage, and diminishing rainfall. October experiences the highest wind speed, with an average wind speed of 8.7mph (14km/h). Leaves changing colors and falling, combined with the crisp weather, do create a classic fall ambiance. Weather in October »Weather in November
Winter begins to set its foot in November in Wheaton, with a notable drop in temperatures. November experiences a resurgence in rainfall, with a monthly average of 1.65" (42mm) of precipitation. The onset of the colder months brings a decline in the number of sunshine hours. Weather in November »Weather in December
December in Wheaton brings about full-fledged winter conditions. The snow-filled, chilly December weather is characterized by temperatures alternating between a high of 34.3°F (1.3°C) and a low of 24.3°F (-4.3°C). Snowfall becomes a regular occurrence again, with December's average snowfall at 3.03" (77mm). Weather in December »Updated: Aug 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With average temperatures fluctuating between a high of 28°F (-2.2°C) and a low of 16.7°F (-8.5°C), January stands out as the coldest month.
January and February, with an average relative humidity of 83%, are most humid months.
In Wheaton, Illinois, during the entire year, the rain falls for 164.3 days and collects up to 33.78" (858mm) of precipitation.
January through May, October through December are months with snowfall.
January is the month with the most snowfall. Snow falls for 13.1 days and accumulates 5.87" (149mm) of snow.
In Wheaton, during the entire year, snow falls for 47 days and aggregates up to 20.2" (513mm) of snow.
January has the least sunshine of the year in Wheaton, with an average of 3.7h of sunshine.
The month with the lowest UV index is January, with an average maximum UV index of 1.
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.
May is the month with the most rainfall. Rain falls for 19.2 days and accumulates 4.45" (113mm) of precipitation.
In Wheaton, snow does not fall in June through September.
June has the longest days of the year, with an average of 15h and 12min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
The month of July, characterized by an average high of 81.7°F (27.6°C) and a low of 65.3°F (18.5°C), is recognized as the warmest.
With an average of 9.9h of sunshine, August has the most sunshine of the year.
With an average relative humidity of 73%, October is the least humid month.
The months with the least rainfall are November and December Rain falls for 10.2 days and accumulates 1.65" (42mm) of rain.
The month with the shortest days is December, with an average of 9h and 12min of daylight.
Average temperature
Wheaton, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure
Wheaton, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Wheaton, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.6mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6mph - Average wind speed in September:
7mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Wheaton, IL
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Wheaton, IL
- Average rainfall in January:
1.81" - Average rainfall in February:
1.81" - Average rainfall in March:
1.97" - Average rainfall in April:
3.78" - Average rainfall in May:
4.45" - Average rainfall in June:
4.29"
- Average rainfall in July:
3.7" - Average rainfall in August:
3.35" - Average rainfall in September:
2.48" - Average rainfall in October:
2.83" - Average rainfall in November:
1.65" - Average rainfall in December:
1.65"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").
Average rainfall days
Wheaton, IL
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
12.1 days - Average rainfall days in April:
17 days - Average rainfall days in May:
19.2 days - Average rainfall days in June:
19.3 days
- Average rainfall days in July:
20.1 days - Average rainfall days in August:
17.9 days - Average rainfall days in September:
14.6 days - Average rainfall days in October:
13.9 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
7.8 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Wheaton, IL
- Average snowfall in January:
5.87" - Average snowfall in February:
5.12" - Average snowfall in March:
1.54" - Average snowfall in April:
2.6" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Wheaton, IL
- Average snowfall days in January:
13.1 days - Average snowfall days in February:
11.5 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 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:
0.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
9.7 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Wheaton, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Wheaton, IL
- Average sunshine days in January:
14.3 days - Average sunshine days in February:
12.2 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
9.4 days - Average sunshine days in May:
9.4 days - Average sunshine days in June:
8.4 days
- Average sunshine days in July:
8.2 days - Average sunshine days in August:
9.3 days - Average sunshine days in September:
12.3 days - Average sunshine days in October:
13.8 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).
Average UV index
Wheaton, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Wheaton, IL
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility
Wheaton, IL
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
