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Monthly climate in Allentown, New Jersey, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Allentown features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (35 °F) and 26 °C (79 °F) through the year, but rarely can drop to -17 °C (1 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1285 mm (50.6 inches) and receives 132 rainy days on the 1 mm (0.04 inches) threshold annually.Allentown enjoys an average of 3024 hours of sunshine throughout the year, and daylight varies from 9 hours 19 minutes to 14 hours 59 minutes per day.

Monthly average temperatures in Allentown, New Jersey, United States §

The warmest months in Allentown are June, July and August, with daily mean temperatures ranging from 23 to 26 °C (73 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 4 °C (35 - 39 °F) throughout the day. On average each year, Allentown experiences 97 days above 25 °C (77.0 °F) and 68 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, New Jersey, 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 20°C
(69°F)		 26°C
(79°F)		 28°C
(83°F)		 31°C
(88°F)		 35°C
(95°F)		 36°C
(98°F)		 37°C
(99°F)		 36°C
(97°F)		 35°C
(95°F)		 35°C
(96°F)		 25°C
(77°F)		 19°C
(67°F)
Mean maximum 17°C
(62°F)		 20°C
(68°F)		 24°C
(75°F)		 28°C
(82°F)		 33°C
(91°F)		 35°C
(94°F)		 36°C
(97°F)		 34°C
(94°F)		 33°C
(91°F)		 29°C
(85°F)		 23°C
(75°F)		 17°C
(63°F)
Average high 5°C
(42°F)		 8°C
(47°F)		 11°C
(52°F)		 17°C
(63°F)		 22°C
(72°F)		 28°C
(82°F)		 31°C
(87°F)		 29°C
(85°F)		 26°C
(79°F)		 20°C
(69°F)		 13°C
(55°F)		 8°C
(46°F)
Daily mean 2°C
(35°F)		 3°C
(39°F)		 6°C
(44°F)		 12°C
(54°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(79°F)		 25°C
(76°F)		 21°C
(71°F)		 16°C
(61°F)		 8°C
(47°F)		 4°C
(39°F)
Average low -2°C
(29°F)		 -1°C
(31°F)		 2°C
(36°F)		 7°C
(45°F)		 12°C
(55°F)		 18°C
(64°F)		 21°C
(71°F)		 21°C
(69°F)		 17°C
(63°F)		 12°C
(53°F)		 3°C
(38°F)		 0°C
(32°F)
Mean minimum -12°C
(11°F)		 -11°C
(12°F)		 -7°C
(20°F)		 0°C
(32°F)		 5°C
(42°F)		 12°C
(54°F)		 16°C
(61°F)		 15°C
(60°F)		 10°C
(50°F)		 3°C
(38°F)		 -5°C
(22°F)		 -9°C
(17°F)
Minimum -17°C
(1°F)		 -16°C
(3°F)		 -10°C
(13°F)		 -2°C
(29°F)		 1°C
(35°F)		 9°C
(48°F)		 13°C
(56°F)		 14°C
(58°F)		 6°C
(43°F)		 1°C
(34°F)		 -10°C
(15°F)		 -12°C
(11°F)

Compare climate in Allentown with other places

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

Monthly average precipitation in Allentown, New Jersey, United States §

Allentown usually has the most precipitation in July, August and October, with an average of 12 rainy days and 134 mm (5.3 inches) of precipitation per month.The driest months in Allentown are January, September and November. On average, 78 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Allentown, New Jersey, 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) 63 (2.5) 109 (4.3) 107 (4.2) 107 (4.2) 127 (5.0) 97 (3.8) 138 (5.4) 131 (5.2) 88 (3.5) 132 (5.2) 83 (3.3) 102 (4.0)
Average precipitation days (≥ 1 mm) 8 11 10 12 13 12 14 14 10 10 9 9

Monthly sunshine hours in Allentown, New Jersey, United States §

The sunniest months in Allentown are June, July and August, when the sun shines an average of 10 hours 47 minutes a day.Least sunny months in Allentown: January, February and December receive an average of 5 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Allentown, New Jersey, 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 152 180 254 250 283 321 352 319 279 231 218 181
Mean daily daylight hours 9h 39m 10h 40m 11h 58m 13h 18m 14h 25m 14h 59m 14h 41m 13h 41m 12h 24m 11h 4m 9h 55m 9h 19m

Solar UV radiation in Allentown, New Jersey, 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, New Jersey, 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 8 10 10 10 9 8 6 4 2