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Monthly climate in Harleysville, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Harleysville features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (34 °F) and 25 °C (78 °F) through the year, but rarely can drop to -20 °C (-3 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1338 mm (52.7 inches) and receives 133 rainy days on the 1 mm (0.04 inches) threshold annually.Harleysville enjoys an average of 2934 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 57 minutes per day.

Monthly average temperatures in Harleysville, Pennsylvania, United States §

The warmest months in Harleysville are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 3 °C (34 - 38 °F) throughout the day. On average each year, Harleysville experiences 93 days above 25 °C (77.0 °F) and 75 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Harleysville, 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 19°C
(66°F)		 26°C
(79°F)		 27°C
(81°F)		 30°C
(87°F)		 34°C
(93°F)		 36°C
(96°F)		 36°C
(97°F)		 34°C
(94°F)		 34°C
(94°F)		 34°C
(93°F)		 24°C
(76°F)		 18°C
(65°F)
Mean maximum 15°C
(60°F)		 19°C
(67°F)		 23°C
(74°F)		 27°C
(82°F)		 32°C
(90°F)		 34°C
(93°F)		 35°C
(96°F)		 34°C
(93°F)		 32°C
(90°F)		 28°C
(83°F)		 23°C
(73°F)		 16°C
(62°F)
Average high 5°C
(41°F)		 7°C
(45°F)		 11°C
(51°F)		 17°C
(62°F)		 22°C
(72°F)		 27°C
(81°F)		 30°C
(86°F)		 29°C
(84°F)		 25°C
(78°F)		 20°C
(68°F)		 12°C
(53°F)		 7°C
(45°F)
Daily mean 1°C
(34°F)		 3°C
(37°F)		 6°C
(43°F)		 12°C
(53°F)		 17°C
(63°F)		 22°C
(72°F)		 25°C
(78°F)		 24°C
(75°F)		 21°C
(69°F)		 15°C
(60°F)		 7°C
(45°F)		 3°C
(38°F)
Average low -2°C
(28°F)		 -1°C
(30°F)		 1°C
(35°F)		 7°C
(44°F)		 12°C
(54°F)		 17°C
(63°F)		 21°C
(69°F)		 20°C
(68°F)		 16°C
(62°F)		 11°C
(52°F)		 2°C
(37°F)		 -1°C
(31°F)
Mean minimum -12°C
(10°F)		 -11°C
(13°F)		 -8°C
(18°F)		 -1°C
(31°F)		 5°C
(41°F)		 11°C
(53°F)		 15°C
(60°F)		 14°C
(58°F)		 9°C
(48°F)		 3°C
(37°F)		 -6°C
(22°F)		 -9°C
(16°F)
Minimum -18°C
(-0°F)		 -17°C
(2°F)		 -20°C
(-3°F)		 -2°C
(28°F)		 1°C
(33°F)		 9°C
(48°F)		 13°C
(55°F)		 13°C
(55°F)		 5°C
(41°F)		 1°C
(34°F)		 -9°C
(16°F)		 -15°C
(6°F)

Compare climate in Harleysville with other places

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

Monthly average precipitation in Harleysville, Pennsylvania, United States §

Harleysville usually has the most precipitation in May, July and August, with an average of 14 rainy days and 151 mm (6.0 inches) of precipitation per month.The driest months in Harleysville are January, September and November. On average, 85 mm (3.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Harleysville, 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) 67 (2.7) 106 (4.2) 105 (4.1) 104 (4.1) 144 (5.7) 111 (4.4) 147 (5.8) 163 (6.4) 100 (4.0) 102 (4.0) 86 (3.4) 101 (4.0)
Average precipitation days (≥ 1 mm) 8 12 11 11 14 12 14 14 9 10 8 10

Monthly sunshine hours in Harleysville, Pennsylvania, United States §

The sunniest months in Harleysville are June, July and August, when the sun shines an average of 10 hours 32 minutes a day.Least sunny months in Harleysville: 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 Harleysville, 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 40m 10h 41m 11h 58m 13h 17m 14h 24m 14h 57m 14h 39m 13h 40m 12h 24m 11h 5m 9h 56m 9h 21m

Solar UV radiation in Harleysville, Pennsylvania, United States §

Harleysville 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 Harleysville UV Index data.

Average daily maximum UV levels by month for Harleysville, 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