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Monthly climate in Jefferson, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Jefferson 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 -17 °C (2 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1311 mm (51.6 inches) and receives 133 rainy days on the 1 mm (0.04 inches) threshold annually.Jefferson enjoys an average of 3022 hours of sunshine throughout the year, and daylight varies from 9 hours 22 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Jefferson, Pennsylvania, United States §

The warmest months in Jefferson are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (73 - 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, Jefferson experiences 98 days above 25 °C (77.0 °F) and 72 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Jefferson, 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 20°C
(68°F)		 26°C
(80°F)		 26°C
(79°F)		 30°C
(86°F)		 33°C
(92°F)		 34°C
(94°F)		 36°C
(98°F)		 35°C
(95°F)		 33°C
(92°F)		 34°C
(93°F)		 24°C
(75°F)		 18°C
(64°F)
Mean maximum 16°C
(61°F)		 20°C
(68°F)		 24°C
(75°F)		 27°C
(81°F)		 32°C
(89°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(93°F)		 32°C
(89°F)		 29°C
(84°F)		 22°C
(73°F)		 16°C
(61°F)
Average high 5°C
(41°F)		 8°C
(46°F)		 11°C
(52°F)		 17°C
(63°F)		 22°C
(73°F)		 27°C
(81°F)		 30°C
(87°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
(38°F)		 6°C
(44°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(73°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
(31°F)		 2°C
(35°F)		 7°C
(45°F)		 13°C
(55°F)		 18°C
(64°F)		 21°C
(70°F)		 20°C
(68°F)		 16°C
(62°F)		 11°C
(52°F)		 3°C
(37°F)		 -0°C
(32°F)
Mean minimum -11°C
(12°F)		 -11°C
(13°F)		 -8°C
(19°F)		 -1°C
(31°F)		 4°C
(40°F)		 11°C
(52°F)		 16°C
(61°F)		 14°C
(58°F)		 9°C
(48°F)		 2°C
(36°F)		 -5°C
(23°F)		 -9°C
(17°F)
Minimum -16°C
(4°F)		 -17°C
(2°F)		 -15°C
(6°F)		 -2°C
(28°F)		 1°C
(33°F)		 8°C
(47°F)		 14°C
(58°F)		 13°C
(56°F)		 5°C
(41°F)		 1°C
(33°F)		 -6°C
(21°F)		 -12°C
(10°F)

Compare climate in Jefferson with other places

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

Monthly average precipitation in Jefferson, Pennsylvania, United States §

Jefferson usually has the most precipitation in May, July and August, with an average of 14 rainy days and 144 mm (5.7 inches) of precipitation per month.The driest months in Jefferson are January, November and December. On average, 81 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Jefferson, 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) 60 (2.4) 97 (3.8) 96 (3.8) 100 (4.0) 139 (5.5) 115 (4.5) 145 (5.7) 148 (5.8) 123 (4.9) 103 (4.1) 90 (3.6) 93 (3.6)
Average precipitation days (≥ 1 mm) 8 11 11 11 14 13 13 16 10 10 7 9

Monthly sunshine hours in Jefferson, Pennsylvania, United States §

The sunniest months in Jefferson are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Jefferson: January, February and December receive an average of 5 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Jefferson, 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 142 178 253 252 275 326 353 317 275 240 221 185
Mean daily daylight hours 9h 41m 10h 41m 11h 58m 13h 17m 14h 23m 14h 56m 14h 38m 13h 39m 12h 23m 11h 5m 9h 57m 9h 22m

Solar UV radiation in Jefferson, Pennsylvania, United States §

Jefferson 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 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 Jefferson UV Index data.

Average daily maximum UV levels by month for Jefferson, 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 7 9 10 10 10 9 8 7 4 3