Climate and monthly weather forecast
Cornwall, PA

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Weather in January

January, the same as December, is an icy winter month in Cornwall, Pennsylvania, with an average temperature varying between 33.8°F (1°C) and 21.6°F (-5.8°C). Cornwall's coldest temperatures are experienced in January, with average high temperatures of 33.8°F (1°C) and lows of 21.6°F (-5.8°C). Weather in January »

Weather in February

February, the last month of the winter in Cornwall, is also a wintry month, with an average temperature varying between 37.9°F (3.3°C) and 23.5°F (-4.7°C). At the onset of February, Cornwall records an average high-temperature of a still icy 37.9°F (3.3°C), showing little deviation from the preceding month. Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Cornwall, Pennsylvania, with an average temperature varying between 31.1°F (-0.5°C) and 46.9°F (8.3°C). March witnesses an increase in the average high-temperature, moving from a cold 37.9°F (3.3°C) in February to a chilly 46.9°F (8.3°C). Weather in March »

Weather in April

April in Cornwall, Pennsylvania, is a mild spring month, with an average temperature varying between 59.4°F (15.2°C) and 41.4°F (5.2°C). April's arrival signals a temperature shift, moving from a chilly 46.9°F (8.3°C) in March to a refreshing 59.4°F (15.2°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Cornwall, Pennsylvania, with an average temperature ranging between max 68.7°F (20.4°C) and min 51.1°F (10.6°C). An increase in the average high-temperature marks May, moving from April's refreshing 59.4°F (15.2°C) to a pleasant 68.7°F (20.4°C). Weather in May »

Weather in June

June, the first month of the summer in Cornwall, is a moderately hot month, with an average temperature fluctuating between 76.6°F (24.8°C) and 58.6°F (14.8°C). Cornwall's transition into June sees a mild rise in the average high-temperature, edging from an agreeable 68.7°F (20.4°C) in May to a moderately hot 76.6°F (24.8°C). Weather in June »

Weather in July

July, like June, in Cornwall, Pennsylvania, is a moderately hot summer month, with an average temperature varying between 82°F (27.8°C) and 63.1°F (17.3°C). July, on average, is the warmest month, registering a high temperature of 82°F (27.8°C) and a low of 63.1°F (17.3°C). The heat index value during July is computed to be a tropical 87.8°F (31°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Cornwall, Pennsylvania, with an average temperature ranging between max 79.9°F (26.6°C) and min 61.7°F (16.5°C). The average high-temperature during August is a still warm 79.9°F (26.6°C), almost matching the conditions of the preceding month. Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Cornwall, Pennsylvania, with temperature in the range of an average high of 73.8°F (23.2°C) and an average low of 55.4°F (13°C). September is marked by a subtle drop in average high-temperatures, transitioning from 79.9°F (26.6°C) in August to a still warm 73.8°F (23.2°C). Weather in September »

Weather in October

October, the same as September, is another refreshing autumn month in Cornwall, Pennsylvania, with an average temperature ranging between min 46°F (7.8°C) and max 61.7°F (16.5°C). Cornwall's transition into October involves a shift in temperature, receding from a warm 73.8°F (23.2°C) in September to a comfortable 61.7°F (16.5°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Cornwall, Pennsylvania, with an average temperature varying between 49.5°F (9.7°C) and 34.9°F (1.6°C). The onset of November coincides with a reduction in the average high-temperature, falling from a refreshing 61.7°F (16.5°C) in October to a chilly 49.5°F (9.7°C). Weather in November »

Weather in December

December, the first month of the winter in Cornwall, is also a wintry month, with an average temperature fluctuating between 29.3°F (-1.5°C) and 40.3°F (4.6°C). Stepping into December, Cornwall observes a temperature decline, with the average high falling from November's frosty 49.5°F (9.7°C) to a wintry 40.3°F (4.6°C). Weather in December »

Frequently asked questions

What month is the coldest?

The lowest temperatures are recorded in January, with averages reaching a high of 33.8°F (1°C) and a low of 21.6°F (-5.8°C).

How much does it rain?

In Cornwall, during the entire year, the rain falls for 137.4 days and collects up to 16.26" (413mm) of precipitation.

When does it snow?

Months with snowfall are January through May, October through December.

When does it snow the most in Cornwall?

January is the month with the most snowfall. Snow falls for 5.2 days and accumulates 1.97" (50mm) of snow.

How much does it snow?

Throughout the year, there are 19.5 snowfall days, and 6.69" (170mm) of snow is accumulated.

When is the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What are the most humid months?

February, May and October, with an average relative humidity of 81%, are most humid months.

What is the driest month?

The month with the least rainfall is February, when the rain falls for 7.8 days and typically collects 0.94" (24mm) of precipitation.

What is the month with the least sunshine?

February has the least sunshine of the year, with an average of 4.5h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, 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 Cornwall?

With an average relative humidity of 76%, April is the least humid month.

What are the months with the highest UV index?

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

When it does not snow?

In Cornwall, snow does not fall in June through September.

When are the longest days?

The month with the longest days is June, with an average of 15h and 0min of daylight.

What are the warmest months?

Cornwall notes the warmest temperatures in July, with a average high of 82°F (27.8°C) and a low of 63.1°F (17.3°C).

What month has the most sunshine?

July has the most sunshine of the year, with an average of 10.4h of sunshine.

What is the wettest month?

The month with the most rainfall is August, when the rain falls for 14.7 days and typically aggregates up to 2.13" (54mm) of precipitation.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

Average temperature
Cornwall, PA

Average temperature - Cornwall, PA

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure
Cornwall, PA

Average pressure - Cornwall, PA

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed
Cornwall, PA

Average wind speed - Cornwall, PA

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity
Cornwall, PA

Average humidity - Cornwall, PA

The months with the highest relative humidity are February, May and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall
Cornwall, PA

Average rainfall - Cornwall, PA

The wettest month (with the highest rainfall) is August (2.13").
The driest month (with the least rainfall) is February (0.94").

Average rainfall days
Cornwall, PA

Average rainfall days - Cornwall, PA

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (6.7 days).

Average snowfall
Cornwall, PA

Average snowfall - Cornwall, PA

The month with the highest snowfall is January (1.97").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Cornwall, PA

Average snowfall days - Cornwall, PA

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Cornwall, PA

Average daylight / Average sunshine - Cornwall, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days
Cornwall, PA

Average sunshine days - Cornwall, PA

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is May (11.5 days).

Average UV index
Cornwall, PA

Average UV index - Cornwall, PA

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

Average visibility
Cornwall, PA

Average visibility - Cornwall, PA

The months with the highest visibility are January, February, March, April, June, July, November and December (6mi).
The months with the lowest visibility are May, August, September and October (5mi).

Cornwall, Pennsylvania, USA

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