Allentown, PA Weather by Month and Climate Averages

How much rain does Allentown get?

Allentown gets 47.4 in of precipitation in an average year, spread over about 129 days with measurable rain. That is more rainy days than 85% of the US.

July is the wettest month, with 5.3 in. February is the driest, with 2.8 in. May has the most rainy days, about 12.

The longest dry spell in the last five years lasted 22 days, to June 11, 2023.

See where Allentown ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Pennsylvania.

Does it snow in Allentown?

Yes. Allentown gets about 33.1 in of snow in an average season, measured at the reporting station.

The snowiest winter on record is 1993–94, with 75.4 in.

The most recent measurable snow at the station fell on February 23, 2026.

See where Allentown ranks: snowiest cities in the US.

Allentown weather by month

Allentown weather in January

In January, Allentown averages a high of 38°F and a low of 21°F. It gets 3.3 in of precipitation over about 11 rainy days. The sun is out about 36% of daylight hours. The January record high is 70°F (2007) and the record low is -15°F (1994).

Allentown weather in February

In February, Allentown averages a high of 41°F and a low of 23°F. It gets 2.8 in of precipitation over about 10 rainy days. The sun is out about 40% of daylight hours. The February record high is 81°F (2018) and the record low is -8°F (1996).

Allentown weather in March

In March, Allentown averages a high of 50°F and a low of 30°F. It gets 3.6 in of precipitation over about 11 rainy days. The sun is out about 42% of daylight hours. The March record high is 87°F (1998) and the record low is 0°F (2015).

Allentown weather in April

In April, Allentown averages a high of 63°F and a low of 40°F. It gets 3.7 in of precipitation over about 12 rainy days. The sun is out about 39% of daylight hours. The April record high is 93°F (1976) and the record low is 16°F (1982). April is one of the most comfortable months to visit.

Allentown weather in May

In May, Allentown averages a high of 72°F and a low of 50°F. It gets 3.6 in of precipitation over about 12 rainy days. The sun is out about 38% of daylight hours. The May record high is 94°F (2026) and the record low is 29°F (1996). May is one of the most comfortable months to visit.

Allentown weather in June

In June, Allentown averages a high of 81°F and a low of 59°F. It gets 4.4 in of precipitation over about 11 rainy days. The sun is out about 43% of daylight hours. The June record high is 98°F (2024) and the record low is 39°F (1972).

Allentown weather in July

In July, Allentown averages a high of 85°F and a low of 64°F. It gets 5.3 in of precipitation over about 11 rainy days. The sun is out about 43% of daylight hours. The July record high is 104°F (2011) and the record low is 46°F (2001).

Allentown weather in August

In August, Allentown averages a high of 83°F and a low of 62°F. It gets 4.6 in of precipitation over about 10 rainy days. The sun is out about 43% of daylight hours. The August record high is 99°F (2002) and the record low is 41°F (1986).

Allentown weather in September

In September, Allentown averages a high of 76°F and a low of 55°F. It gets 4.8 in of precipitation over about 10 rainy days. The sun is out about 47% of daylight hours. The September record high is 99°F (1980) and the record low is 32°F (1974). September is one of the most comfortable months to visit.

Allentown weather in October

In October, Allentown averages a high of 65°F and a low of 43°F. It gets 4.1 in of precipitation over about 10 rainy days. The sun is out about 49% of daylight hours. The October record high is 93°F (2019) and the record low is 21°F (1988). October is one of the most comfortable months to visit.

Allentown weather in November

In November, Allentown averages a high of 53°F and a low of 33°F. It gets 3.2 in of precipitation over about 9 rainy days. The sun is out about 54% of daylight hours. The November record high is 79°F (1982) and the record low is 11°F (2018).

Allentown weather in December

In December, Allentown averages a high of 42°F and a low of 26°F. It gets 3.9 in of precipitation over about 12 rainy days. The sun is out about 39% of daylight hours. The December record high is 72°F (2006) and the record low is -5°F (1989).

Sunshine, humidity and wind in Allentown

November is the sunniest month in Allentown, with sunshine about 54% of daylight hours. January is the cloudiest, at 36%. Over the year the sun shines about 43% of daylight hours. Allentown is cloudier than 76% of the US.

Humidity peaks in September at 69% and is lowest in March at 56%.

Wind averages 7 mph over the year, and March is the windiest month at 9 mph.

Allentown has about 17 days a year above 90°F. Allentown is cooler than 65% of the US.

Thunderstorms occur on about 25 days a year.

See where Allentown ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.

First and last freeze in Allentown

The first fall freeze in Allentown typically comes around October 19, and the last spring freeze around April 22. That leaves a frost-free growing season of about 180 days.

Allentown weather records

The hottest temperature on record at the Allentown station is 104°F, on July 22, 2011. The coldest is -15°F, on January 21, 1994.

The wettest day on record brought 8.7 in of rain, on October 8, 2005.

46 all-time records have been set at the station since 1970.

The annual mean temperature has changed by +0.4°F per decade since 1970.

The best time to visit Allentown

The most comfortable time to visit is typically April to May and September to October, when daytime highs sit near 69°F.

Winter (December–February) is chilly, with average highs around 40°F and lows near 23°F. Snow is possible.

Spring (March–May) is mild, with average highs around 62°F and lows near 40°F.

Summer (June–August) is hot, with average highs around 83°F and lows near 62°F.

Autumn (September–November) is mild, with average highs around 65°F and lows near 44°F.

Allentown climate questions

How much rain does Allentown get?

Allentown gets 47.4 in of precipitation in an average year, over about 129 rainy days.

What is the wettest month in Allentown?

July is the wettest month in Allentown, with 5.3 in. February is the driest, with 2.8 in.

How many rainy days does Allentown have a year?

Allentown has about 129 days with measurable rain in an average year. May has the most, about 12.

Does it snow in Allentown?

Yes. Allentown gets about 33.1 in of snow in an average season. The snowiest winter on record is 1993–94, with 75.4 in.

What is the hottest month in Allentown?

July is the warmest month in Allentown, with an average high of 85°F.

What is the coldest month in Allentown?

January is the coldest month in Allentown, with an average low of 21°F.

What is the record high temperature in Allentown?

The record high at the Allentown station is 104°F, set on July 22, 2011. The record low is -15°F, on January 21, 1994.

What is the sunniest month in Allentown?

November is the sunniest month in Allentown, with sunshine about 54% of daylight hours. January is the cloudiest.

When is the first frost in Allentown?

The first fall freeze in Allentown typically comes around October 19. The last spring freeze is around April 22.

What is the best time to visit Allentown?

The most comfortable time to visit is typically April to May and September to October, when daytime highs sit near 69°F.