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Monthly climate in Allentown, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Allentown features a humid continental climate (Dfa).Temperatures typically range between 1 °C (33 °F) and 25 °C (77 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 37 °C (98 °F).The average annual precipitation amounts to about 1307 mm (51.5 inches) and receives 133 rainy days on the 1 mm (0.04 inches) threshold annually.Allentown enjoys an average of 2934 hours of sunshine throughout the year, and daylight varies from 9 hours 18 minutes to 15 hours 0 minutes per day.

Monthly average temperatures in Allentown, Pennsylvania, United States §

The warmest months in Allentown are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (33 - 37 °F) throughout the day. On average each year, Allentown experiences 92 days above 25 °C (77.0 °F) and 84 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Allentown, Pennsylvania, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 18°C
(65°F)		 26°C
(79°F)		 26°C
(80°F)		 30°C
(86°F)		 34°C
(93°F)		 35°C
(96°F)		 37°C
(98°F)		 35°C
(96°F)		 34°C
(94°F)		 34°C
(93°F)		 24°C
(76°F)		 18°C
(64°F)
Mean maximum 15°C
(59°F)		 19°C
(66°F)		 23°C
(73°F)		 27°C
(81°F)		 32°C
(89°F)		 34°C
(93°F)		 36°C
(96°F)		 34°C
(93°F)		 32°C
(90°F)		 28°C
(83°F)		 22°C
(73°F)		 16°C
(61°F)
Average high 4°C
(40°F)		 7°C
(44°F)		 10°C
(51°F)		 16°C
(62°F)		 22°C
(72°F)		 27°C
(81°F)		 30°C
(87°F)		 29°C
(84°F)		 25°C
(78°F)		 19°C
(67°F)		 11°C
(53°F)		 6°C
(44°F)
Daily mean 1°C
(33°F)		 2°C
(36°F)		 5°C
(42°F)		 11°C
(52°F)		 17°C
(63°F)		 22°C
(72°F)		 25°C
(77°F)		 24°C
(75°F)		 20°C
(69°F)		 15°C
(59°F)		 7°C
(44°F)		 3°C
(37°F)
Average low -3°C
(27°F)		 -2°C
(29°F)		 1°C
(33°F)		 6°C
(43°F)		 12°C
(54°F)		 16°C
(62°F)		 20°C
(69°F)		 19°C
(67°F)		 16°C
(61°F)		 10°C
(51°F)		 2°C
(35°F)		 -1°C
(30°F)
Mean minimum -13°C
(9°F)		 -12°C
(11°F)		 -9°C
(17°F)		 -2°C
(29°F)		 4°C
(40°F)		 11°C
(52°F)		 15°C
(59°F)		 13°C
(56°F)		 8°C
(46°F)		 2°C
(35°F)		 -6°C
(21°F)		 -10°C
(15°F)
Minimum -19°C
(-2°F)		 -18°C
(0°F)		 -20°C
(-4°F)		 -3°C
(27°F)		 0°C
(33°F)		 7°C
(46°F)		 13°C
(56°F)		 12°C
(54°F)		 4°C
(40°F)		 1°C
(33°F)		 -10°C
(13°F)		 -15°C
(6°F)

Compare climate in Allentown with other places

Compare temperature, precipitation, sunshine, UV index in Allentown, Pennsylvania, United States with other places around the world.

Monthly average precipitation in Allentown, Pennsylvania, United States §

Allentown usually has the most precipitation in May, July and August, with an average of 13 rainy days and 141 mm (5.5 inches) of precipitation per month.The driest months in Allentown are January, September and November. On average, 86 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Allentown, Pennsylvania, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 69 (2.7) 107 (4.2) 102 (4.0) 106 (4.2) 140 (5.5) 102 (4.0) 136 (5.4) 146 (5.8) 100 (3.9) 106 (4.2) 88 (3.5) 103 (4.1)
Average precipitation days (≥ 1 mm) 8 12 11 11 13 13 14 13 9 11 8 10

Monthly sunshine hours in Allentown, Pennsylvania, United States §

The sunniest months in Allentown are June, July and August, when the sun shines an average of 10 hours 32 minutes a day.Least sunny months in Allentown: January, February and December receive an average of 5 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Allentown, Pennsylvania, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 140 173 242 248 273 312 345 310 270 221 216 177
Mean daily daylight hours 9h 38m 10h 39m 11h 58m 13h 18m 14h 26m 15h 0m 14h 42m 13h 41m 12h 24m 11h 4m 9h 54m 9h 18m

Solar UV radiation in Allentown, Pennsylvania, United States §

Allentown experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Allentown UV Index data.

Average daily maximum UV levels by month for Allentown, Pennsylvania, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 6 9 10 10 10 9 8 6 4 2