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Harrisburg, Pennsylvania climate

Cfa Humid subtropical

Harrisburg has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 88°F, while the coldest is January averaging around 25°F at night. Precipitation is fairly even year-round, totalling about 41 inches.

☀️ Summers

Hot

Highs near 88°F in July.

About 24 days a year above 90 °F

❄️ Winters

Cold

Lows near 25°F in January.

About 96 freezing nights a year

🌧️ Rain

Wet

About 41 in of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+2.2 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Harrisburg climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	40	43	53	65	75	83	88	85	79	67	55	44
Avg temp (°F)	33	35	43	54	64	73	78	75	69	57	46	37
Avg low (°F)	25	26	34	43	53	63	67	66	58	47	37	30
Precipitation (in)	2.6	2.4	3.4	3.7	3.5	3.7	4.3	3.7	4.1	3.7	2.8	3.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	40	43	53	65	75	83
Avg temp (°F)	33	35	43	54	64	73
Avg low (°F)	25	26	34	43	53	63
Precipitation (in)	2.6	2.4	3.4	3.7	3.5	3.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	88	85	79	67	55	44
Avg temp (°F)	78	75	69	57	46	37
Avg low (°F)	67	66	58	47	37	30
Precipitation (in)	4.3	3.7	4.1	3.7	2.8	3.2

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	9	10	12	13	11	11	11	9	10	8	10
Days with high ≥ 90°F (days)	—	—	—	0.1	1	4	10	6	2	0.1	—	—
Days with low ≤ 32°F (days)	24	22	15	3	0.0	—	—	—	—	1	9	21
Days with snowfall ≥ 1 in (days)	0.0	—	0.1	—	—	—	—	—	—	—	—	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	9	9	10	12	13	11
Days with high ≥ 90°F (days)	—	—	—	0.1	1	4
Days with low ≤ 32°F (days)	24	22	15	3	0.0	—
Days with snowfall ≥ 1 in (days)	0.0	—	0.1	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	11	11	9	10	8	10
Days with high ≥ 90°F (days)	10	6	2	0.1	—	—
Days with low ≤ 32°F (days)	—	—	—	1	9	21
Days with snowfall ≥ 1 in (days)	—	—	—	—	—	—

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	68	67	66	65	65	61	57	57	57	59	64	69
Clear days (≤ 30% cloud)	3	4	5	6	5	5	7	7	8	7	5	3
Partly cloudy days (30–70%)	11	10	10	8	11	12	12	12	10	10	10	10
Cloudy days (≥ 70%)	16	15	16	16	15	13	11	12	12	13	15	17
Relative humidity (%)	86	84	81	78	78	74	68	68	71	77	81	85
Wind speed (mph)	4.0	4.2	4.1	3.5	2.8	2.5	2.3	2.2	2.4	2.6	2.8	3.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	68	67	66	65	65	61
Clear days (≤ 30% cloud)	3	4	5	6	5	5
Partly cloudy days (30–70%)	11	10	10	8	11	12
Cloudy days (≥ 70%)	16	15	16	16	15	13
Relative humidity (%)	86	84	81	78	78	74
Wind speed (mph)	4.0	4.2	4.1	3.5	2.8	2.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	57	57	57	59	64	69
Clear days (≤ 30% cloud)	7	7	8	7	5	3
Partly cloudy days (30–70%)	12	12	10	10	10	10
Cloudy days (≥ 70%)	11	12	12	13	15	17
Relative humidity (%)	68	68	71	77	81	85
Wind speed (mph)	2.3	2.2	2.4	2.6	2.8	3.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Harrisburg Capital City AP (NOAA GHCN station USW00014751), about 7 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →