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Monthly climate in Belfast, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Belfast features a humid continental climate (Dfa).Temperatures typically range between 0 °C (32 °F) and 25 °C (76 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 1323 mm (52.1 inches) and receives 132 rainy days on the 1 mm (0.04 inches) threshold annually.Belfast enjoys an average of 2837 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 1 minutes per day.

Monthly average temperatures in Belfast, Pennsylvania, United States §

The warmest months in Belfast are June, July and August, with daily mean temperatures ranging from 21 to 25 °C (70 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 2 °C (32 - 36 °F) throughout the day. On average each year, Belfast experiences 84 days above 25 °C (77.0 °F) and 91 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Belfast, 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
(64°F)		 25°C
(77°F)		 26°C
(78°F)		 29°C
(85°F)		 33°C
(91°F)		 35°C
(94°F)		 36°C
(96°F)		 34°C
(94°F)		 33°C
(92°F)		 33°C
(91°F)		 24°C
(75°F)		 17°C
(63°F)
Mean maximum 14°C
(57°F)		 18°C
(65°F)		 22°C
(71°F)		 26°C
(79°F)		 31°C
(88°F)		 33°C
(92°F)		 35°C
(95°F)		 33°C
(92°F)		 32°C
(89°F)		 28°C
(82°F)		 22°C
(72°F)		 16°C
(60°F)
Average high 3°C
(38°F)		 6°C
(43°F)		 9°C
(49°F)		 16°C
(60°F)		 21°C
(71°F)		 26°C
(80°F)		 30°C
(86°F)		 28°C
(83°F)		 25°C
(77°F)		 19°C
(66°F)		 11°C
(52°F)		 6°C
(43°F)
Daily mean -0°C
(32°F)		 1°C
(35°F)		 5°C
(40°F)		 10°C
(51°F)		 16°C
(62°F)		 21°C
(70°F)		 25°C
(76°F)		 23°C
(74°F)		 20°C
(68°F)		 14°C
(58°F)		 6°C
(43°F)		 2°C
(36°F)
Average low -4°C
(25°F)		 -3°C
(27°F)		 -0°C
(32°F)		 5°C
(42°F)		 11°C
(52°F)		 16°C
(61°F)		 20°C
(67°F)		 19°C
(66°F)		 15°C
(59°F)		 10°C
(50°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -14°C
(7°F)		 -13°C
(9°F)		 -10°C
(15°F)		 -2°C
(28°F)		 4°C
(39°F)		 10°C
(50°F)		 14°C
(58°F)		 12°C
(55°F)		 7°C
(45°F)		 1°C
(35°F)		 -7°C
(19°F)		 -10°C
(14°F)
Minimum -20°C
(-4°F)		 -19°C
(-1°F)		 -20°C
(-4°F)		 -4°C
(25°F)		 0°C
(32°F)		 6°C
(43°F)		 13°C
(55°F)		 11°C
(52°F)		 3°C
(37°F)		 1°C
(34°F)		 -13°C
(9°F)		 -14°C
(8°F)

Compare climate in Belfast with other places

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

Monthly average precipitation in Belfast, Pennsylvania, United States §

Belfast usually has the most precipitation in May, July and August, with an average of 12 rainy days and 135 mm (5.3 inches) of precipitation per month.The driest months in Belfast are January, March and November. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Belfast, 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) 72 (2.8) 108 (4.2) 98 (3.9) 108 (4.2) 139 (5.5) 102 (4.0) 127 (5.0) 140 (5.5) 109 (4.3) 123 (4.8) 91 (3.6) 108 (4.2)
Average precipitation days (≥ 1 mm) 8 12 11 12 13 12 12 13 9 10 9 11

Monthly sunshine hours in Belfast, Pennsylvania, United States §

The sunniest months in Belfast are June, July and August, when the sun shines an average of 10 hours 12 minutes a day.Least sunny months in Belfast: January, February and December receive an average of 5 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Belfast, 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 136 172 239 235 265 304 333 300 265 211 202 169
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 27m 15h 1m 14h 43m 13h 42m 12h 24m 11h 4m 9h 53m 9h 17m

Solar UV radiation in Belfast, Pennsylvania, United States §

Belfast 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 Belfast UV Index data.

Average daily maximum UV levels by month for Belfast, 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 8 10 10 10 9 8 6 4 2