Climate and monthly weather forecast
Berwyn, IL

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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 »
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Frequently asked questions

What time of the year is the coldest in Berwyn?

January, with its average high-temperature of 29.1°F (-1.6°C) and an average low-temperature of 19.2°F (-7.1°C), holds the record as the coldest month.

What is the most humid month in Berwyn?

January and February, with an average relative humidity of 82%, are most humid months in Berwyn, Illinois.

How many days does it rain in Berwyn?

Throughout the year, in Berwyn, there are 92 rainfall days, and 7.4" (188mm) of precipitation is accumulated.

When does it snow in Berwyn?

January through April, October through December are months with snowfall.

How many days does it snow in Berwyn?

Throughout the year, in Berwyn, Illinois, there are 26.5 snowfall days, and 4.06" (103mm) of snow is accumulated.

What is the month with the least sunshine in Berwyn?

January has the least sunshine of the year in Berwyn, with an average of 3.8h of sunshine.

What are the months with the lowest UV index in Berwyn?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the driest month in Berwyn?

February, March, November and December are months with the least rain in Berwyn when the rain falls for 3.3 days and typically aggregates up to 0.39" (10mm) of rain.

When does it snow the most in Berwyn?

The month with the most snowfall in Berwyn, Illinois, is February, when snow falls for 7.3 days and typically aggregates up to 1.38" (35mm) of snow.

When is Daylight Saving Time (DST) in Berwyn?

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.

What is the wettest month in Berwyn?

The month with the most rainfall in Berwyn is May, when the rain falls for 11.3 days and typically aggregates up to 1.1" (28mm) of precipitation.

When it does not snow in Berwyn?

May through September are months without snowfall.

When are the longest days in Berwyn?

June has the longest days of the year, with an average of 15h and 12min of daylight.

What are the months with the highest UV index in Berwyn?

The months with the highest UV index in Berwyn are June through August, with an average maximum UV index of 6.

What part of the year is the hottest in Berwyn?

July, with average temperatures reaching a high of 80.4°F (26.9°C) and a low of 67.1°F (19.5°C), is the warmest month in Berwyn.

What month has the most sunshine in Berwyn?

August has the most sunshine of the year in Berwyn, with an average of 10.6h of sunshine.

What is the least humid month in Berwyn?

The least humid month in Berwyn, Illinois, is October, with an average relative humidity of 72%.

What is the month with the shortest days in Berwyn?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

Average temperature
Berwyn, IL

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).

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Average pressure
Berwyn, IL

Average pressure - Berwyn, IL

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Berwyn, IL

Average wind speed - Berwyn, IL

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).

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Average humidity
Berwyn, IL

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%).

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Average rainfall
Berwyn, IL

Average rainfall - Berwyn, IL

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").

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Average rainfall days
Berwyn, IL

Average rainfall days - Berwyn, IL

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).

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Average snowfall
Berwyn, IL

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").

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Average snowfall days
Berwyn, IL

Average snowfall days - Berwyn, IL

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).

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Average daylight / Average sunshine
Berwyn, IL

Average daylight / Average sunshine - Berwyn, IL

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).

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).

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Average sunshine days
Berwyn, IL

Average sunshine days - Berwyn, IL

The month with the most sunshine days is December (23.7 days).
The month with the least sunshine days is June (14.3 days).

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Average visibility
Berwyn, IL

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).

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Berwyn, Illinois, USA

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