Harrisburg climate — normals and trends

Q: What is the climate of Harrisburg?

Harrisburg has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,049 mm of precipitation per year.

Q: What is the hottest day ever recorded in Harrisburg?

The hottest day measured in Harrisburg between 1940 and 2025 was 22 July 2011, reaching 39.1 °C.

Q: What is the coldest day in Harrisburg?

The coldest day measured in Harrisburg between 1940 and 2025 was 29 January 1963, at -25.8 °C.

Q: Does it snow in Harrisburg?

Yes. Harrisburg gets on average 72.3 cm of snow per year and has around 91 frost days.

Q: Has the climate of Harrisburg warmed?

Yes: Harrisburg warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Harrisburg?

The wettest day measured in Harrisburg between 1940 and 2025 was 22 June 1972, with 156 mm of rain in 24 hours.

Q: What was the windiest day in Harrisburg?

The windiest day measured in Harrisburg between 1940 and 2025 was 3 April 1975, with winds reaching 42.5 km/h.

Q: What is the warmest month in Harrisburg?

The warmest month in Harrisburg is July (24.1 °C on average); the coldest is January (-1.0 °C).

Q: How much does it rain in Harrisburg?

Harrisburg receives on average 1,049 mm of precipitation per year, spread over about 118 rainy days.

Q: Is it sunny in Harrisburg?

Harrisburg gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.

Harrisburg (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.7 °C and it receives 1,049 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is July (24.1 °C on average) and the coldest is January (-1.0 °C). Rainfall peaks in May.

Harrisburg averages 91 frost days, 36 hot days (≥ 30 °C) and 118 rainy days per year.

Harrisburg has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.

The number of frost days there went from about 103 to 79 per year over the period.

The hottest day of the period reached 39.1 °C (on 22 July 2011) and the coldest -25.8 °C (on 29 January 1963).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

HarrisburgPennsylvania

coords: 40.27°, -76.88°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthMayDriest monthFebruary

Mean daily temperature

11.7°C

Average daily high

16.6°C

Average daily low

7.3°C

Annual rainfall

1,049mm

Sunshine / day

8.7h

Mean relative humidity

68%

Average peak wind

15.2km/h

Seasonal range

25.1°C

Frost days (< 0 °C)

91 d/yr

Hot days (≥ 30 °C)

36 d/yr

Rainy days (≥ 1 mm)

118 d/yr

Annual snowfall

72.3 cm

Average feels-like high

15.1 °C

Average feels-like low

5.0 °C

Average peak gust

36.5 km/h

Tropical nights (≥ 20 °C)

35 d/yr

Solar radiation

14.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.47 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

39.1 °C

22 July 2011

Coldest day

-25.8 °C

29 January 1963

Wettest day

156 mm

22 June 1972

Windiest day

42.5 km/h

3 April 1975

Strongest gust

126.4 km/h

25 November 1950

Hottest feels-like

44.2 °C

15 July 1995

Coldest feels-like

-31.4 °C

21 January 1985

Snowiest day

43.8 cm

13 March 1993

Sunniest day

14.4 h

2 July 2007

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.9 °C24 June 2025	-17.3 °C22 January 2025	12.5 °C	969 mm	39	89
2024	38.5 °C16 July 2024	-12.0 °C23 December 2024	13.5 °C	1,061 mm	49	61
2023	34.5 °C4 September 2023	-11.2 °C4 February 2023	13.6 °C	1,049 mm	34	51
2022	36.7 °C24 July 2022	-15.9 °C24 December 2022	12.8 °C	1,052 mm	53	92
2021	35.5 °C12 August 2021	-12.6 °C8 February 2021	13.4 °C	1,011 mm	48	66
2020	36.8 °C27 July 2020	-8.7 °C15 February 2020	13.5 °C	1,028 mm	50	56
2019	36.2 °C21 July 2019	-18.5 °C7 March 2019	12.9 °C	1,117 mm	60	91
2018	36.5 °C2 July 2018	-15.6 °C7 January 2018	12.5 °C	1,640 mm	41	83
2017	34.4 °C13 June 2017	-12.0 °C28 December 2017	13.1 °C	1,070 mm	38	66
2016	36.0 °C23 July 2016	-14.1 °C14 February 2016	13.2 °C	976 mm	64	77
2015	35.7 °C19 July 2015	-22.2 °C24 February 2015	12.7 °C	877 mm	51	87
2014	34.8 °C23 July 2014	-18.6 °C7 January 2014	11.4 °C	842 mm	26	102
2013	35.7 °C18 July 2013	-12.4 °C23 January 2013	12.1 °C	922 mm	38	97
2012	37.4 °C18 July 2012	-12.0 °C4 January 2012	13.5 °C	864 mm	51	67
2011	39.1 °C22 July 2011	-15.3 °C22 January 2011	12.7 °C	1,517 mm	39	90
2010	37.6 °C7 July 2010	-10.9 °C10 January 2010	12.8 °C	1,055 mm	56	91
2009	34.6 °C10 August 2009	-15.8 °C17 January 2009	11.7 °C	1,062 mm	19	89
2008	34.9 °C10 June 2008	-13.5 °C11 February 2008	12.1 °C	1,091 mm	28	88
2007	35.5 °C9 July 2007	-15.3 °C5 February 2007	12.5 °C	901 mm	54	96
2006	36.3 °C3 August 2006	-12.1 °C19 February 2006	13.0 °C	982 mm	42	67
2005	35.9 °C4 August 2005	-18.5 °C28 January 2005	12.3 °C	909 mm	51	89
2004	33.0 °C9 June 2004	-20.0 °C25 January 2004	11.9 °C	1,176 mm	21	93
2003	33.4 °C22 August 2003	-21.8 °C28 January 2003	10.9 °C	1,288 mm	21	100
2002	37.3 °C2 August 2002	-10.8 °C10 December 2002	12.6 °C	1,070 mm	52	80
2001	36.2 °C9 August 2001	-18.0 °C23 January 2001	12.4 °C	737 mm	27	84
2000	32.1 °C2 June 2000	-15.9 °C29 December 2000	11.4 °C	952 mm	11	90
1999	36.3 °C6 July 1999	-13.9 °C10 January 1999	12.4 °C	951 mm	47	76
1998	32.9 °C26 June 1998	-13.7 °C1 January 1998	13.2 °C	1,005 mm	27	60
1997	35.7 °C15 July 1997	-22.8 °C19 January 1997	11.4 °C	875 mm	29	87
1996	33.9 °C20 May 1996	-21.1 °C5 February 1996	10.9 °C	1,537 mm	10	95
1995	38.0 °C15 July 1995	-16.3 °C8 February 1995	11.7 °C	1,108 mm	39	101
1994	36.0 °C15 June 1994	-24.3 °C19 January 1994	11.7 °C	1,121 mm	44	94
1993	35.6 °C27 August 1993	-18.7 °C19 February 1993	11.7 °C	1,114 mm	53	88
1992	35.0 °C14 July 1992	-12.7 °C19 January 1992	11.2 °C	967 mm	20	85
1991	36.4 °C23 July 1991	-12.4 °C22 January 1991	13.0 °C	914 mm	63	84
1990	36.2 °C4 July 1990	-13.0 °C26 February 1990	12.9 °C	1,129 mm	32	71
1989	33.8 °C10 July 1989	-16.6 °C22 December 1989	11.2 °C	1,236 mm	23	100
1988	38.2 °C16 July 1988	-16.9 °C29 January 1988	11.5 °C	892 mm	52	96
1987	36.0 °C21 July 1987	-20.3 °C28 January 1987	11.9 °C	1,106 mm	43	89
1986	34.5 °C7 July 1986	-19.5 °C29 January 1986	11.7 °C	1,097 mm	31	88
1985	34.4 °C15 August 1985	-24.5 °C21 January 1985	11.8 °C	946 mm	25	91
1984	34.3 °C13 June 1984	-25.0 °C22 January 1984	11.4 °C	1,125 mm	27	89
1983	36.4 °C20 August 1983	-20.3 °C25 December 1983	11.7 °C	1,185 mm	57	79
1982	33.9 °C18 July 1982	-23.0 °C17 January 1982	11.2 °C	955 mm	22	95
1981	34.4 °C16 June 1981	-17.7 °C13 January 1981	11.2 °C	918 mm	20	93
1980	38.8 °C20 July 1980	-17.9 °C25 December 1980	11.6 °C	790 mm	62	98
1979	34.0 °C15 July 1979	-23.5 °C18 February 1979	11.3 °C	1,118 mm	23	92
1978	34.8 °C23 July 1978	-16.8 °C5 February 1978	10.7 °C	1,218 mm	27	99
1977	35.6 °C16 July 1977	-20.2 °C17 January 1977	11.6 °C	984 mm	41	94
1976	32.6 °C18 April 1976	-15.6 °C2 February 1976	11.0 °C	1,047 mm	26	106
1975	35.0 °C2 August 1975	-15.7 °C10 February 1975	11.9 °C	1,337 mm	26	94
1974	34.3 °C9 July 1974	-14.1 °C14 January 1974	11.7 °C	1,077 mm	27	90
1973	35.3 °C28 August 1973	-17.0 °C17 February 1973	12.1 °C	1,274 mm	35	80
1972	34.1 °C21 July 1972	-17.0 °C8 February 1972	11.1 °C	1,362 mm	28	95
1971	34.1 °C8 July 1971	-21.3 °C1 February 1971	11.5 °C	1,135 mm	29	84
1970	33.1 °C27 July 1970	-17.9 °C9 January 1970	11.2 °C	1,004 mm	43	98
1969	35.9 °C28 June 1969	-16.2 °C25 December 1969	11.3 °C	968 mm	33	113
1968	34.8 °C1 July 1968	-18.4 °C12 January 1968	11.3 °C	820 mm	44	100
1967	33.5 °C12 June 1967	-19.4 °C8 February 1967	10.8 °C	1,035 mm	24	94
1966	38.5 °C3 July 1966	-17.9 °C29 January 1966	11.0 °C	944 mm	49	99
1965	35.0 °C24 July 1965	-19.4 °C4 February 1965	11.0 °C	799 mm	38	96
1964	35.7 °C30 June 1964	-17.0 °C15 January 1964	11.4 °C	890 mm	44	97
1963	35.1 °C27 June 1963	-25.8 °C29 January 1963	10.6 °C	807 mm	34	103
1962	35.8 °C8 July 1962	-21.9 °C11 February 1962	10.7 °C	973 mm	35	115
1961	34.0 °C2 July 1961	-19.9 °C2 February 1961	11.1 °C	1,079 mm	41	93
1960	32.4 °C29 August 1960	-18.7 °C23 December 1960	10.8 °C	1,033 mm	21	114
1959	36.2 °C29 June 1959	-16.2 °C19 January 1959	12.2 °C	1,062 mm	57	96
1958	33.0 °C15 July 1958	-19.5 °C11 February 1958	10.5 °C	1,068 mm	23	100
1957	36.0 °C21 July 1957	-19.0 °C17 January 1957	11.7 °C	909 mm	33	86
1956	33.9 °C13 June 1956	-10.2 °C25 January 1956	11.2 °C	1,052 mm	21	90
1955	36.9 °C22 July 1955	-18.5 °C3 February 1955	11.9 °C	966 mm	42	105
1954	38.1 °C31 July 1954	-19.2 °C18 January 1954	11.9 °C	897 mm	32	90
1953	38.7 °C3 September 1953	-9.9 °C18 December 1953	12.4 °C	1,000 mm	48	77
1952	37.3 °C26 June 1952	-12.3 °C30 January 1952	11.9 °C	1,246 mm	46	85
1951	34.0 °C27 July 1951	-20.5 °C17 December 1951	11.5 °C	1,135 mm	33	92
1950	33.2 °C26 June 1950	-16.7 °C28 December 1950	11.0 °C	1,214 mm	17	106
1949	35.3 °C10 August 1949	-17.0 °C3 February 1949	12.7 °C	978 mm	45	73
1948	36.9 °C26 August 1948	-20.6 °C19 January 1948	11.0 °C	1,091 mm	30	95
1947	32.8 °C20 August 1947	-15.1 °C5 February 1947	11.2 °C	973 mm	20	110
1946	33.5 °C19 July 1946	-15.7 °C22 January 1946	11.8 °C	1,044 mm	19	83
1945	33.7 °C1 July 1945	-19.1 °C25 January 1945	10.9 °C	1,392 mm	15	96
1944	34.9 °C12 August 1944	-16.8 °C22 December 1944	11.0 °C	1,064 mm	39	106
1943	33.8 °C12 August 1943	-20.3 °C16 February 1943	10.5 °C	882 mm	33	113
1942	34.0 °C19 July 1942	-20.5 °C8 January 1942	10.9 °C	1,262 mm	19	109
1941	35.3 °C28 July 1941	-18.1 °C10 February 1941	11.1 °C	804 mm	28	109
1940	34.5 °C30 July 1940	-19.4 °C20 January 1940	10.0 °C	1,082 mm	15	109

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

17.2 °C

+0.6 °C

Hot days (≥ 30 °C)

39 d/yr

Frost days (< 0 °C)

89 d/yr

-2

Annual rainfall

969 mm

-80 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	1.5 °C	-1.3 °C	29 mm	-50 mm
Feb	4.9 °C	+0.3 °C	65 mm	-10 mm
Mar	15.0 °C	+5.1 °C	65 mm	-31 mm
Apr	18.1 °C	+1.5 °C	82 mm	-12 mm
May	21.5 °C	-0.5 °C	198 mm	+97 mm
Jun	27.8 °C	+1.0 °C	127 mm	+39 mm
Jul	30.4 °C	+1.1 °C	131 mm	+41 mm
Aug	27.0 °C	-1.2 °C	46 mm	-38 mm
Sep	26.1 °C	+1.8 °C	41 mm	-51 mm
Oct	18.7 °C	+0.7 °C	87 mm	+7 mm
Nov	11.6 °C	+0.4 °C	33 mm	-52 mm
Dec	3.7 °C	-1.4 °C	64 mm	-20 mm

The year's extremes

Hottest day

35.9 °C

24 Jun 2025

Coldest day

-17.3 °C

22 Jan 2025

Wettest day

53.0 mm

30 Oct 2025

Windiest day

31.6 km/h

11 Nov 2025

Strongest gust

82.4 km/h

16 Mar 2025

Hottest feels-like

41.2 °C

23 Jun 2025

Coldest feels-like

-22.4 °C

22 Jan 2025

Snowiest day

8.3 cm

2 Dec 2025

Sunniest day

14.4 h

4 Jul 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Harrisburg?

Harrisburg has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,049 mm of precipitation per year.

What is the hottest day ever recorded in Harrisburg?

The hottest day measured in Harrisburg between 1940 and 2025 was 22 July 2011, reaching 39.1 °C.

What is the coldest day in Harrisburg?

The coldest day measured in Harrisburg between 1940 and 2025 was 29 January 1963, at -25.8 °C.

Does it snow in Harrisburg?

Yes. Harrisburg gets on average 72.3 cm of snow per year and has around 91 frost days.

Has the climate of Harrisburg warmed?

Yes: Harrisburg warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Harrisburg?

The wettest day measured in Harrisburg between 1940 and 2025 was 22 June 1972, with 156 mm of rain in 24 hours.

What was the windiest day in Harrisburg?

The windiest day measured in Harrisburg between 1940 and 2025 was 3 April 1975, with winds reaching 42.5 km/h.

What is the warmest month in Harrisburg?

The warmest month in Harrisburg is July (24.1 °C on average); the coldest is January (-1.0 °C).

How much does it rain in Harrisburg?

Harrisburg receives on average 1,049 mm of precipitation per year, spread over about 118 rainy days.

Is it sunny in Harrisburg?

Harrisburg gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.

What is the biggest single-day snowfall in Harrisburg?

The heaviest 24-hour snowfall measured in Harrisburg between 1940 and 2025 was 13 March 1993, with 43.8 cm.

Are there tropical nights in Harrisburg?

Yes: Harrisburg has on average 35 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Harrisburg?

In Harrisburg, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 15 July 1995, and the lowest was -31.4 °C on 21 January 1985.

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