Climate and monthly weather forecast
Bethlehem, PA

A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania
A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania

Weather in January

January, like December, in Bethlehem, Pennsylvania, is a wintry winter month, with an average temperature ranging between min 21.6°F (-5.8°C) and max 34°F (1.1°C). January is the coldest month, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 21.6°F (-5.8°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Bethlehem, Pennsylvania, with an average temperature fluctuating between 37.8°F (3.2°C) and 23.4°F (-4.8°C). In Bethlehem, Pennsylvania, the average high-temperature in February is relatively the same as in January - a still cold 37.8°F (3.2°C). Weather in February »

Weather in March

March, the first month of the spring in Bethlehem, is a frosty month, with an average temperature varying between 30°F (-1.1°C) and 46°F (7.8°C). In March, the average high-temperature marginally rises from a cold 37.8°F (3.2°C) in February to a frosty 46°F (7.8°C). Weather in March »

Weather in April

April in Bethlehem, Pennsylvania, is a mild spring month, with an average temperature fluctuating between 40.6°F (4.8°C) and 58.6°F (14.8°C). In April, the average high-temperature rises from a frosty 46°F (7.8°C) in March to a mild 58.6°F (14.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Bethlehem, Pennsylvania, with an average temperature varying between 69.6°F (20.9°C) and 50.5°F (10.3°C). In Bethlehem, Pennsylvania, the average high-temperature in May increases from a moderate 58.6°F (14.8°C) in April to a pleasant 69.6°F (20.9°C). Weather in May »

Weather in June

June, the first month of the summer in Bethlehem, is a moderately hot month, with an average temperature ranging between max 77.4°F (25.2°C) and min 57.9°F (14.4°C). In June, the average high-temperature slightly increases from a pleasant 69.6°F (20.9°C) in May to a moderately hot 77.4°F (25.2°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Bethlehem, Pennsylvania, with an average temperature fluctuating between 83.5°F (28.6°C) and 63.5°F (17.5°C). July is the warmest month, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 63.5°F (17.5°C). The average heat index in July is estimated at a tropical 91.2°F (32.9°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Bethlehem, Pennsylvania, with an average temperature fluctuating between 81°F (27.2°C) and 61.5°F (16.4°C). In August, the average high-temperature is almost the same as in July - a still warm 81°F (27.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Bethlehem, Pennsylvania, with an average temperature fluctuating between 55°F (12.8°C) and 74.3°F (23.5°C). In September, the average high-temperature slightly decreases from 81°F (27.2°C) in August to a still warm 74.3°F (23.5°C). Weather in September »

Weather in October

October, like September, in Bethlehem, Pennsylvania, is another enjoyable autumn month, with an average temperature ranging between min 46.2°F (7.9°C) and max 62.1°F (16.7°C). In October, the average high-temperature drops from a warm 74.3°F (23.5°C) in September to an enjoyable 62.1°F (16.7°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Bethlehem, Pennsylvania, with an average temperature fluctuating between 50°F (10°C) and 35.4°F (1.9°C). In November, the average high-temperature decreases from an enjoyable 62.1°F (16.7°C) in October to a cool 50°F (10°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Bethlehem, Pennsylvania, with temperature in the range of an average low of 28.8°F (-1.8°C) and an average high of 40.1°F (4.5°C). In Bethlehem, the average high-temperature in December drops from a fresh 50°F (10°C) in November to a wintry 40.1°F (4.5°C). Weather in December »
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FAQ

What is the coldest month in Bethlehem?

The coldest month is January, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 21.6°F (-5.8°C).

How much does it rain in Bethlehem?

Throughout the year, in Bethlehem, Pennsylvania, there are 153 rainfall days, and 26.81" (681mm) of precipitation is accumulated.

When does it snow in Bethlehem?

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

How many days does it snow in Bethlehem?

In Bethlehem, Pennsylvania, during the entire year, snow falls for 26.7 days and aggregates up to 14.49" (368mm) of snow.

What is the month with the lowest UV index in Bethlehem?

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

What is the most humid month in Bethlehem?

February is the most humid month in Bethlehem, with an average relative humidity of 82%.

What is the month with the least sunshine in Bethlehem?

The month with the least sunshine in Bethlehem, Pennsylvania, is February, with an average of 4.5h of sunshine.

When does it snow the most in Bethlehem?

March is the month with the most snowfall in Bethlehem. Snow falls for 5 days and accumulates 4.13" (105mm) of snow.

When is Daylight Saving Time (DST) in Bethlehem?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

What are the least humid months in Bethlehem?

The months with the lowest humidity are April and July, with an average relative humidity of 76%.

When is the highest UV index in Bethlehem?

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

When it does not snow in Bethlehem?

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

When are the longest days in Bethlehem?

With an average of 15h and 2min of daylight, June has the longest days of the year.

What is the warmest month in Bethlehem?

The warmest month is July, with an average high-temperature of 83.5°F (28.6°C) and an average low-temperature of 63.5°F (17.5°C).

What is the rainiest month in Bethlehem?

The month with the most rainfall in Bethlehem is July, when the rain falls for 16.2 days and typically aggregates up to 2.91" (74mm) of precipitation.

What month has the most sunshine in Bethlehem?

The month with the most sunshine in Bethlehem is July, with an average of 10.4h of sunshine.

What is the driest month in Bethlehem?

The month with the least rainfall is September, when the rain falls for 11.8 days and typically collects 1.57" (40mm) of precipitation.

What is the month with the shortest days in Bethlehem?

With an average of 9h and 19min of daylight, December has the shortest days of the year in Bethlehem, Pennsylvania.

Average pressure
Bethlehem, PA

Average pressure - Bethlehem, 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
Bethlehem, PA

Average wind speed - Bethlehem, PA

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity
Bethlehem, PA

Average humidity - Bethlehem, PA

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

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Average rainfall
Bethlehem, PA

Average rainfall - Bethlehem, PA

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days
Bethlehem, PA

Average rainfall days - Bethlehem, PA

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall
Bethlehem, PA

Average snowfall - Bethlehem, PA

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Bethlehem, PA

Average snowfall days - Bethlehem, PA

The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Bethlehem, PA

Average daylight / Average sunshine - Bethlehem, PA

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

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).

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Average sunshine days
Bethlehem, PA

Average sunshine days - Bethlehem, PA

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

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Average UV index
Bethlehem, PA

Average UV index - Bethlehem, 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).

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Average visibility
Bethlehem, PA

Average visibility - Bethlehem, PA

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

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