Climate and monthly weather forecastBerwyn, IL
Climate and monthly weather forecast
The climate of Berwyn
Berwyn, Illinois, experiences a variety of weather conditions due to its location in the humid continental climate zone, classified as Dfa by Köppen climate classification. This classification typically features hot summers with no dry season and cold winters. In Berwyn, these factors combine to produce a climate with stark contrasts each season, where temperatures fluctuate and precipitation varies.The highest average temperatures occur from June to August, peaking at 80.4°F (26.9°C) in July. On the colder end of the spectrum, January is typically the coldest month, with temperatures dipping as low as 19.2°F (-7.1°C). The occurrence of humidity also follows a pattern, hitting the maximum level at 82% relative humidity in January and February, while achieving the lowest at 72% in October.
Rainfall averages from 0.39" (10mm) in the drier months of February, March, November, and December, up to 1.1" (28mm) in May. The months with the highest average snowfall are January and February, bringing in 1.06" (27mm) and 1.38" (35mm) of snow respectively. A combination of such weather parameters portrays an annual pattern in Berwyn where each season brings its unique touch, be it the heat and humidity of summer or the chill and snow of winter.
The best time to visit Berwyn
In deciding the best time to visit Berwyn, the period from late spring to early summer proves advantageous. The weather is most appealing during May when temperatures are relatively warm, averaging between 51.4°F (10.8°C) to 64.9°F (18.3°C), and the rainfall is at its annual peak of 1.1" (28mm). Similarly, in June, temperatures lie between 61.3°F (16.3°C) and 75°F (23.9°C) with a manageable average rainfall of 0.83" (21mm). The day’s length extends to 15.2 hours, making it the year's longest daylight period, thus providing ample time for outdoor activities.The worst time to visit Berwyn
The time that might be considered unfavorable for a visit to Berwyn is in the winter season, particularly in January. During this month, temperatures can fall to a frigid 19.2°F (-7.1°C), with the highest temperature hovering comparatively low at 29.1°F (-1.6°C). Combined with the highest average humidity of 82% and snowfall of 1.06" (27mm), conditions can be harsh for outdoor activities.Spring weather in Berwyn
In Berwyn, the spring season commences from March and extends through May. During this time, an increase in temperatures from 32.2°F (0.1°C) to 51.4°F (10.8°C) and a rise in daylight from 12 hours to 14.6 hours are observed. Alongside, rainfall increases, peaking at 1.1" (28mm) in May, marking the arrival of wetter weather. Simultaneously, the occurrence of snow is significantly reduced, almost disappearing by the end of the season.Summer weather in Berwyn
Berwyn's summer periods from June to August are marked by the year’s warmest temperatures, with averages extending from 61.3°F (16.3°C) to 80.4°F (26.9°C). Evenings can be relatively cooler, falling to between 61.3°F (16.3°C) and 67.1°F (19.5°C). Peaks of the annual daylight hours, up to 15.2 hours, are enjoyed in June adding more vigor to the warm summer days. Rainfall is experienced consistently, but with a slight dip from the spring, averaging around 0.91" (23mm).Autumn weather in Berwyn
Autumn in Berwyn lasts from September to November. A gradual decrease in temperature is evident across these months, with highs dropping from 72.9°F (22.7°C) in September to 46°F (7.8°C) in November. Despite this dip, daylight still extends to 9.8 hours even in late November. With average rainfall being around 0.52" (13mm), these conditions make Autumn an enjoyable season in Berwyn.Winter weather in Berwyn
Winter in Berwyn starts in December and ends in February. During this time, temperatures often drop sharply, accompanied by the lowest daylight hours of the year, shrinking to 9.2 hours in December. The lowest temperatures of the year occur in January with averages falling to as low as 19.2°F (-7.1°C). The presence of 1.38" (35mm) of snowfall in February correlates to the chilly winter experienced in Berwyn.Weather in January
Berwyn begins its year with wintry weather conditions characterized by cold temperatures, regular snowfall, and limited sunlight. Weather patterns in January reveal lower temperatures compared to those in the ensuing month of February. Weather in January »Weather in February
February paints a somewhat similar picture to January; however, a slight break in the harsh winter conditions is evident, paving the way for an upcoming spring season in Berwyn. Slight increases in temperatures can be felt as the town edges closer towards the end of winter. Weather in February »Weather in March
March witnesses the transition from winter to spring, as significantly milder weather begins to take over in Berwyn. Comparatively, temperatures are higher than those in February, hinting at a brighter season ahead. Remarkably, rainfall increases to 0.39" (10mm) in March, equating to an average of 7.8 rainy days. Weather in March »Weather in April
April signifies a continuation of spring's mild weather, offering the inhabitants of Berwyn a refreshing break from the winter chills. This month experiences warmer weather compared to March, paving the way for increased outdoor engagement. Weather in April »Weather in May
In May, Berwyn experiences further upliftment in temperature, marking a transit towards the forthcoming summer season. As the temperatures soar compared to April, locals start preparing for the hotter months ahead. The highlight of weather conditions in May is its maximum temperature averaging around 64.9°F (18.3°C). Weather in May »Weather in June
Summer begins to stake its claim over Berwyn in June, as temperatures rise steadily, coinciding with the year's longest days. The substantial increase in temperature from May makes June a markedly warmer month. The average maximum UV index in June stands at 6, necessitating precautions against sunburns and skin damage. Weather in June »Weather in July
Mid-year, July heralds the peak of summer in Berwyn, exhibiting the highest temperatures of the year. The heat experienced in June escalates, resulting in July becoming the hottest month. An important characteristic of July's weather is the peak average temperature, which measures around 80.4°F (26.9°C). Weather in July »Weather in August
August largely mirrors the hot weather of July, demonstrating a continuation of the summer season in Berwyn. Comparatively, August records only slightly lower temperatures than the preceding month of July. One of the salient features of August is its noteworthy pressure readings, which average around 29.98" (761mm). Weather in August »Weather in September
September signals the advent of autumn in Berwyn, with temperatures starting to slide down from their summer highs. The temperature in this month is less intense compared to August, but September maintains a moderately warm climate. Weather in September »Weather in October
In October, Berwyn fully embraces the autumn season, featuring a calm and relaxed atmosphere. The town observes a significant reduction in temperature from September, paving the way for more pleasant weather. A noticeable weather parameter for October is the rise in wind speed, with an average of 9.9mph (15.9km/h). Weather in October »Weather in November
November marks the onset of winter in Berwyn, as temperatures drop significantly from the mild conditions observed in October. The shift in weather patterns is clear, with colder days and even colder nights becoming the norm. Notably, November sees a significant increase in snowfall, recording an average of 0.43" (11mm). Weather in November »Weather in December
December welcomes the peak winter season in Berwyn, characterized by the lowest temperatures of the year and frequent snowfall. The month is significantly colder compared to November, leading to much shorter days and longer nights. Weather in December »Updated: Aug 16, 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
Berwyn's January weather reaches an average high of 29.1°F (-1.6°C) and an average low of 19.2°F (-7.1°C), making it the coldest month.
January and February, with an average relative humidity of 82%, are most humid months.
In Berwyn, during the entire year, the rain falls for 92 days and collects up to 7.4" (188mm) of precipitation.
January through April, October through December are months with snowfall.
In Berwyn, Illinois, during the entire year, snow falls for 26.5 days and aggregates up to 4.06" (103mm) of snow.
The month with the least sunshine is January, with an average of 3.8h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
February, March, November and December are months with the least rain when the rain falls for 3.3 days and typically aggregates up to 0.39" (10mm) of rain.
The month with the most snowfall is February, when snow falls for 7.3 days and typically aggregates up to 1.38" (35mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Berwyn, 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 11.3 days and typically aggregates up to 1.1" (28mm) of precipitation.
May through September are months without snowfall.
The month with the longest days in Berwyn is June, 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 temperatures reach their highest averages in July, with highs of 80.4°F (26.9°C) and lows of 67.1°F (19.5°C).
With an average of 10.6h of sunshine, August has the most sunshine of the year.
The least humid month is October, with an average relative humidity of 72%.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Berwyn, IL
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (29.1°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).
Average pressure
Berwyn, 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
Berwyn, IL
- Average wind speed in January:
10.9mph - Average wind speed in February:
10.6mph - Average wind speed in March:
9.9mph - Average wind speed in April:
10.1mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.9mph - Average wind speed in August:
6.8mph - Average wind speed in September:
8.1mph - Average wind speed in October:
9.9mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity
Berwyn, 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
Berwyn, IL
- Average rainfall in January:
0.43" - Average rainfall in February:
0.39" - Average rainfall in March:
0.39" - Average rainfall in April:
0.75" - Average rainfall in May:
1.1" - Average rainfall in June:
0.83"
- Average rainfall in July:
0.91" - Average rainfall in August:
0.63" - Average rainfall in September:
0.51" - Average rainfall in October:
0.67" - Average rainfall in November:
0.39" - Average rainfall in December:
0.39"
The wettest month (with the highest rainfall) is May (1.1").
The driest months (with the least rainfall) are February, March, November and December (0.39").
Average rainfall days
Berwyn, IL
- Average rainfall days in January:
3.1 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
7.8 days - Average rainfall days in April:
10.5 days - Average rainfall days in May:
11.3 days - Average rainfall days in June:
11.7 days
- Average rainfall days in July:
10.8 days - Average rainfall days in August:
9.5 days - Average rainfall days in September:
7.5 days - Average rainfall days in October:
6.7 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is June (11.7 days).
The month with the least rainy days is January (3.1 days).
Average snowfall
Berwyn, IL
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Berwyn, IL
- Average snowfall days in January:
7.2 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
4.3 days - Average snowfall days in April:
1.3 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:
0.1 days - Average snowfall days in November:
1.8 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Berwyn, 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 48min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 36min - Average sunshine in September:
9h and 6min - Average sunshine in October:
5h and 48min - 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 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Berwyn, IL
- Average sunshine days in January:
22.1 days - Average sunshine days in February:
20.3 days - Average sunshine days in March:
19.4 days - Average sunshine days in April:
16.3 days - Average sunshine days in May:
15.4 days - Average sunshine days in June:
14.3 days
- Average sunshine days in July:
14.6 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
19.9 days - Average sunshine days in October:
22.4 days - Average sunshine days in November:
22.5 days - Average sunshine days in December:
23.7 days
The month with the most sunshine days is December (23.7 days).
The month with the least sunshine days is June (14.3 days).
Average UV index
Berwyn, 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 and December (UV index 1).
Average cloud cover
Berwyn, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Berwyn, 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).
