Climate and monthly weather forecastDowners Grove, IL
Climate and monthly weather forecast
The climate of Downers Grove
Downers Grove is situated within the state of Illinois, in the United States of America. An assessment of the town’s weather pattern reveals that it belongs to the Dfa category of the Köppen climate classification. In the context of this classification, it means that Downers Grove experiences a humid continental climate, with no dry season and hot summers.Analysis of the weather data throughout the year shows significant variation in different parameters. Temperatures vary widely from a low of 17.1°F (-8.3°C) in January to a peak of 82.4°F (28°C) in July. Humidity shows a slight variation, remaining more or less stable around 75% with slight increases to 82% in January and February. Rainfall is somewhat distributed throughout the year, with the highest seen in May, 1.97" (50mm), and the lowest in December, 0.63" (16mm). The number of rainfall days is also highest in May with 14.9 days and lowest in December with 4.9 days.
Snowfall, primarily happening between December to March, contributes to lower visibility during these months. The amount of sunlight available also varies with the shorter days in December receiving 9.2 hours of daylight and 4.1 hours of sunshine, compared to the longest days in June with 15.2 hours of daylight and 9.6 hours of sunshine.
The best time to visit Downers Grove
Considering the temperate variations and relative humidity conditions, the period from June to September presents the best time to visit Downers Grove. This period offers warm temperatures averaging between 68.9°F (20.5°C) to 81.1°F (27.3°C) and reduced rainfall. Also, greater sunshine duration, peaking at 9.6 hours in June, provides longer days for outdoor activities. The UV index is elevated though during these summer months, visitors should take necessary precautions against sunburn.The worst time to visit Downers Grove
Winter months from December to February may not be the ideal time to visit Downers Grove. The temperatures drop dramatically to lows of 17.1°F (-8.3°C) to 19.9°F (-6.7°C). Along with the cold temperatures, the area receives significant snowfall, reaching 2.28" (58mm) in February. The number of daylight hours is also diminished significantly in comparison to other months. Coupled with cloud cover, it leads to reduced sunshine hours, dropping to a low of 4.1 in December.Spring weather in Downers Grove
In Downers Grove, spring season spans March through May. The town observes a gradual rise in temperature, starting from a brisk 45.1°F (7.3°C) in March and concluding at a pleasant 68.9°F (20.5°C) in May. Correspondingly the low-temperature averages also escalate from 31.5°F (-0.3°C) to 52.2°F (11.2°C). Rainfall reaches its highest point, with May receiving 1.97" (50mm) spread over almost 15 days. However, the number of sunshine hours steadily increases, providing adequate intervals for outdoor enjoyment.Summer weather in Downers Grove
Summer, from June to August, is characterized by warm temperatures. The town observes average high temperatures range from 74.3°F (23.5°C) to 82.4°F (28°C) and low temperatures from 57.9°F (14.4°C) to 66.4°F (19.1°C). Despite the increase in temperature, relative humidity levels stay within a comfortable range. Rainfall rates slow down, and sunshine duration spikes with June offering up to 9.6 hours of sunshine each day.Autumn weather in Downers Grove
Autumn in Downers Grove stretches from September to November, presenting a mix of balmy and cool temperatures. Average high temperatures start decreasing from September’s 74.3°F (23.5°C) reaching to November’s 45.7°F (7.6°C). At the same time, nights get progressively cooler, moving from 57.9°F (14.4°C) to 33.6°F (0.9°C). Rainfall rates dip, and the amount of sunshine hours gradually decreases.Winter weather in Downers Grove
The winter months in Downers Grove are December to February. In this frigid season, the town faces low temperatures ranging from 25°F (-3.9°C) to 19.9°F (-6.7°C) with the coldest month being January. High temperatures do not exceed 34.5°F (1.4°C) creating frosty conditions. Notable snowfall is observed, specifically maximum in February with 2.28" (58mm). Short day lengths reduce the available sunshine hours, achieving the lowest duration of 4.1 hours in December.Weather in January
Brisk cold reigns in January in Downers Grove, marking the onset of the year with snowfall as high as 1.81" (46mm). The chilly January weather is somewhat harsher relative to December, and certainly more intense than the coming month of February. Weather in January »Weather in February
February welcomes an easing in the icy grip of January, signaling a gradual transition toward lighter weather. Despite its reputation as a winter month, February experiences a lesser degree of snowfall at 2.28" (58mm), compared to January. Weather in February »Weather in March
With spring in sight, March represents a significant warming period in Downers Grove compared to February. The month's weather showcases a rather abrupt shift from the dormant cold of winter, with snowfall dwindling to just 0.59" (15mm). Weather in March »Weather in April
April ushers in a distinct switch from winter's remnants to spring's vibrancy in Downers Grove. With temperatures scaling upward from March, April becomes more generous with daylight at 13.4 hours, benefiting all the sun-seekers. Weather in April »Weather in May
Serving as a harbinger of summer, May brings a pleasant change to the weather of Downers Grove from April. The town experiences a significant rise in daily sunshine of 8.5 hours, painting vivid hues of summer in the landscape. The month witnesses a steady increase in temperature, fostering a comfortable environment for outdoor activities. Weather in May »Weather in June
June kicks off the summer season in Downers Grove with an unprecedented increase in temperature from May. This month sees trendy weather patterns, showing characteristics such as the longest daylight hours of the year at 15.2 hours. Weather in June »Weather in July
In Downers Grove, July signifies the height of summer, standing as the hottest month with peak temperatures reaching up to 82.4°F (28°C). Weather markers like humidity and pressure hold steady from June, emphasising the stillness of days filled with heat. Weather in July »Weather in August
August offers somewhat of a reprieve in Downers Grove from July's potent warmth. The decline in peak temperature by 1.3°F (-17.1°C) indicates a move towards cooler seasons. The relative humidity remains steady, a sign that the season's fiery touch is softening. Weather in August »Weather in September
September in Downers Grove marks the onset of fall, with a decrease in temperature from August. The month begins to reel back the long days of summer, replacing them with shorter daylight hours of 12.5. It further transitions the weather pattern by producing slightly less rainfall than August. Weather in September »Weather in October
October brings with it a definitive shift to autumn in Downers Grove. The temperature continues to descend from September, prompting residents to welcome heavier clothing. A further decrease in daylight hours to 11.1 signals the approaching winter. Weather in October »Weather in November
November is a brief transition period for Downers Grove with weather conditions between those of the fall season and the upcoming winter. A significant drop in temperature from October ushers in the crisp winter chill that November is well-known for. Weather in November »Weather in December
December in Downers Grove is notably colder, rounding out the year with the arrival of winter. Mostly characterized by a further decline in temperature from November, this month sees a surge in snowfall to 0.75" (19mm). The daylight hours shrink significantly, resulting in noticeably shorter days and longer nights. Weather in December »Updated: Aug 18, 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 28.8°F (-1.8°C) and lows at 17.1°F (-8.3°C).
The months with the highest humidity are January and February, with an average relative humidity of 82%.
In Downers Grove, during the entire year, the rain falls for 118.5 days and collects up to 13.74" (349mm) of precipitation.
January through April, October through December are months with snowfall in Downers Grove.
Throughout the year, there are 34.9 snowfall days, and 7.2" (183mm) of snow is accumulated.
January has the least sunshine of the year, 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.
The month with the most snowfall is February, when snow falls for 8.6 days and typically aggregates up to 2.28" (58mm) of snow.
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 is May, when the rain falls for 14.9 days and typically aggregates up to 1.97" (50mm) of precipitation.
May through September are months without snowfall.
The month with the longest days is June, with an average of 15h and 12min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
July is the warmest month, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C).
August has the most sunshine of the year, with an average of 10h of sunshine.
With an average relative humidity of 72%, October is the least humid month in Downers Grove.
The month with the least rainfall in Downers Grove is December, when the rain falls for 4.9 days and typically collects 0.63" (16mm) of precipitation.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Downers Grove, IL
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure
Downers Grove, 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:
30.1"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
Downers Grove, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.4mph - Average wind speed in May:
8mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.1mph - Average wind speed in September:
7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9mph
The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity
Downers Grove, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Downers Grove, IL
- Average rainfall in January:
0.67" - Average rainfall in February:
0.71" - Average rainfall in March:
0.75" - Average rainfall in April:
1.38" - Average rainfall in May:
1.97" - Average rainfall in June:
1.61"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.34" - Average rainfall in September:
1.18" - Average rainfall in October:
1.22" - Average rainfall in November:
0.67" - Average rainfall in December:
0.63"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").
Average rainfall days
Downers Grove, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
9.1 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
4.9 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).
Average snowfall
Downers Grove, IL
The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Downers Grove, IL
- Average snowfall days in January:
9.7 days - Average snowfall days in February:
8.6 days - Average snowfall days in March:
4.9 days - Average snowfall days in April:
1.4 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:
0.4 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
7.2 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Downers Grove, IL
- Average daylight in January:
9h and 36min - 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 0min - 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 54min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 42min - 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: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Downers Grove, IL
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
16.1 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
20.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).
Average UV index
Downers Grove, 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
Downers Grove, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Downers Grove, 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).
