Climate and monthly weather forecast
Chester, PA

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The climate of Chester

Located in the state of Pennsylvania, USA, Chester features a unique blend of weather conditions throughout the year. The city has a Koppen climate classification of Cfa which indicates a humid subtropical climate with no dry season. This geographical placement assigns Chester with distinct weather changes across four notable seasons.

From the periodic data, interesting trends become evident. Clear climate parameters shape Chester's weather, with temperature fluctuations, distinctive humidity levels, and rainfall serving as key indicators. Among them, alterations in temperature stand out. Low averages from 25.7°F (-3.5°C) to 68.7°F (20.4°C) and high averages between 37.4°F (3°C) and 85.6°F (29.8°C) show a prominent range. These fluctuations manifest distinctly across different months, making each season unique.

Relative humidity remains fairly steady, with values ranging between 71% and 77%. Rainfall indicates variability, with monthly averages of 1.61" (41mm) to 3.11" (79mm) and number of days with rain fluctuating from 7.1 to 17.

A singular feature of Chester's climate is its periodical mix of rain and snow, noticeable from the recorded data. The presence of snow is particularly interesting with monthly averages showing values from 0.16" (4mm) to 2.32" (59mm), translated into the number of days with snow varying from a blip of 0.1 to a significant 3.8 days.

The best time to visit Chester

One might consider the warm period from May to September as an ideal time to visit Chester. During this period, high averages of 72°F (22.2°C) to 85.6°F (29.8°C) and comfortable humidity levels around 73% to 76% create a pleasant climate. Daylight hours peak up to around 15 hours as the longest period of the year. Yet, visitors should prepare for some rainfall with the highest amount of 3.11" (79mm) in August and a maximum of 17 rainy days in July.

The worst time to visit Chester

The colder months of Chester, specifically January and February, can be challenging for visitors. With low averages dropping to 25.7°F (-3.5°C) and 27.9°F (-2.3°C) respectively, these months bring a significant chill. Additionally, these months present the least daylight hours, bottoming at around 9.7 hours.

Spring weather in Chester

Spring in Chester unfolds from March to May with temperatures climbing from an average low of 34.9°F (1.6°C) to a comfortable high of 72°F (22.2°C). A gradual increase in daylight hours from 12 to 14.4 hours might entice outdoor explorations. Nonetheless, the spring months experience a considerable increase in rainfall, with averages rising from 2.28" (58mm) in March to 2.32" (59mm) in May.

Summer weather in Chester

Starting in June and concluding in August, summer in Chester stands out as the warmest season. With temperatures averaging a high of 85.6°F (29.8°C) in July, coupled with the most substantial brightness, approximately 15 hours of daylight, summer indeed shines bright. The occasional rainfall does cool off the region, with rainfall peaking at 3.11" (79mm) in August.

Autumn weather in Chester

Seasonal transitions mark autumn months in Chester, from September to November. Temperatures start to drop slowly from a high of 76.6°F (24.8°C) in September to a modest 52.7°F (11.5°C) in November. Rainfall sees a noticeable decline, with November inviting fewer rainy days, around 8.7 days. Daylight hours also begin to retract, dipping from 12.4 hours in September to 10 hours in November.

Winter weather in Chester

Winter engulfs Chester from December to February, presenting markedly colder temperatures. A high of 44.1°F (6.7°C) in December gradually slips to a low of 25.7°F (-3.5°C) in January. The days grow shorter with the least daylight hours around 9.4 in December. The presence of snow during winter adds a frosty touch, reaching a peak of 2.32 in March. Despite its cold embrace, the winter season holds its unique charm and tranquillity.

Weather in January

Chester, Pennsylvania welcomes the new year with the brisk chill of winter. This month is colder than December, but slightly higher in temperature relation to February. The city experiences snowfall, witnessing an average of 1.73" (44mm). Weather in January »

Weather in February

February is the coldest month in Chester, Pennsylvania, but there is a slight increase in daily sunshine hours when compared with January. The city receives a lesser amount of snowfall, 1.61" (41mm), compared to the previous month. Weather in February »

Weather in March

The month of March signals the transition from winter to spring in Chester. The climate begins to warm up with an uptick in the average temperatures. However, the city does experience the highest snowfall of the year at 2.32" (59mm), the start of the month still clings to winter's edge. Weather in March »

Weather in April

April is characterized by a significant leap in temperatures, helping to shake off the lingering chill of winter. Chester experiences rainfall around 2.01" (51mm), with the recurrence of rain affecting the relative humidity. Despite the showers, the amount of sunshine per day increases, indicating the progression towards the brighter, warmer months. Weather in April »

Weather in May

May is the start of the warmer period in Chester, with temperatures climbing steadily. A small increase in rainfall to 2.32" (59mm) marks the late arrival of spring showers. Despite the increased precipitation, this month is generally pleasant with the increase in daylight hours and temperatures paving the way for outdoor activities. Weather in May »

Weather in June

The arrival of June marks the beginning of summer in Chester, Pennsylvania. The weather is reliably warm, with the longest daylight hours throughout the year. However, this month sees the most amounts of rainfall at 2.28" (58mm), but it comes with an increased amount of sunshine per day. Weather in June »

Weather in July

In Chester, July is the warmest month of the year, characterized by its high temperatures and extended daylight hours. This month sees the highest average humidity relative to the rest of the year, making the heat ambience prominent. Weather in July »

Weather in August

August in Chester brings together high temperatures and increased rainfall, which peaks at 3.11" (79mm). While the temperatures just slightly dip from July, the diminished daylight hours hint towards the approaching end of summer. Weather in August »

Weather in September

September marks a significant change in Chester's climate as temperatures begin to cool. A drop in rainfall to 1.73" (44mm) signifies the arrival of early autumn. The city eagerly welcomes autumn as the leaves begin to change color, offering a spectacular canvas of hues. Weather in September »

Weather in October

October brings a crisp chill to Chester as autumn sets in firmly. The trees are in their full fall glory, offering an exquisite view of the colorful canopy. Rainfall and temperatures continue to drop from September, but even with the cooler conditions, the city remains visually stunning. Weather in October »

Weather in November

In November, Chester moves deeper into the fall season with a further drop in temperatures. The onset of the winter chill is evident with the return of snowfall at approximately 0.35" (9mm). The fallen leaves transform the landscape, wrapping the city in a cascade of vibrant hues. Weather in November »

Weather in December

Chester, Pennsylvania welcomes December with winter's cool embrace. This month receives the most snowfall at about 0.91" (23mm). Despite the dark, cold days, the city is lit up by holiday lights, creating a festive atmosphere. It is a time of quietness and calm, as Chester wraps up the year awaiting another round of changing seasons. December in Chester signifies a minor drop in average high-temperature, transitioning from a fresh 52.7°F (11.5°C) in November to a frosty 44.1°F (6.7°C). Weather in December »
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Frequently asked questions

What is the coldest month in Chester?

Chester records the coldest temperatures in January, averaging a high of 37.4°F (3°C) and a low of 25.7°F (-3.5°C).

What is the driest month in Chester?

January is the month with the least rainfall in Chester. Rain falls for 7.1 days and accumulates 1.61" (41mm) of precipitation.

How many days does it rain in Chester?

Throughout the year, in Chester, Pennsylvania, there are 148.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.

When does it snow in Chester?

Months with snowfall are January through May, November and December.

How much does it snow in Chester?

Throughout the year, there are 12.6 snowfall days, and 7.28" (185mm) of snow is accumulated.

When is the lowest UV index in Chester?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Chester.

What is the most humid month in Chester?

February, October and December, with an average relative humidity of 77%, are most humid months.

What is the month with the least sunshine in Chester?

With an average of 4.9h of sunshine, February has the least sunshine of the year.

What is the snowiest month in Chester?

March is the month with the most snowfall. Snow falls for 3 days and accumulates 2.32" (59mm) of snow.

When is Daylight Saving Time (DST) in Chester?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Chester, Pennsylvania, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Chester?

With an average relative humidity of 71%, April is the least humid month in Chester.

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

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

When it does not snow in Chester?

In Chester, Pennsylvania, snow does not fall in June through October.

When are the longest days in Chester?

With an average of 15h and 0min of daylight, June has the longest days of the year in Chester, Pennsylvania.

What time of the year is the hottest in Chester?

July, with an average high of 85.6°F (29.8°C) and a low of 68.7°F (20.4°C), signifies the warmest month of the year in Chester.

What month has the most sunshine in Chester?

The month with the most sunshine in Chester, Pennsylvania, is July, with an average of 10.7h of sunshine.

What is the rainiest month in Chester?

August is the month with the most rainfall. Rain falls for 16.1 days and accumulates 3.11" (79mm) of precipitation.

What is the month with the shortest days in Chester?

With an average of 9h and 24min of daylight, December has the shortest days of the year in Chester, Pennsylvania.

Average temperature
Chester, PA

Average temperature - Chester, PA

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).

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Average pressure
Chester, PA

Average pressure - Chester, PA

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed
Chester, PA

Average wind speed - Chester, PA

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity
Chester, PA

Average humidity - Chester, PA

The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).

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Average rainfall
Chester, PA

Average rainfall - Chester, PA

The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").

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Average rainfall days
Chester, PA

Average rainfall days - Chester, PA

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).

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Average snowfall
Chester, PA

Average snowfall - Chester, PA

The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days
Chester, PA

Average snowfall days - Chester, PA

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Chester, PA

Average daylight / Average sunshine - Chester, PA

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).

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days
Chester, PA

Average sunshine days - Chester, PA

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).

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Average UV index
Chester, PA

Average UV index - Chester, PA

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Chester, PA

Average visibility - Chester, PA

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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Chester, Pennsylvania, USA

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