Summit climate — normals and trends

Q: What is the climate of Summit?

Summit has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,142 mm of precipitation per year.

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

The hottest day measured in Summit between 1940 and 2025 was 6 July 2010, reaching 39.2 °C.

Q: What is the coldest day in Summit?

The coldest day measured in Summit between 1940 and 2025 was 22 January 1984, at -24.7 °C.

Q: Does it snow in Summit?

Yes. Summit gets on average 68.4 cm of snow per year and has around 84 frost days.

Q: Has the climate of Summit warmed?

Yes: Summit warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Summit?

The wettest day measured in Summit between 1940 and 2025 was 16 September 1999, with 149 mm of rain in 24 hours.

Q: What was the windiest day in Summit?

The windiest day measured in Summit between 1940 and 2025 was 29 October 2012, with winds reaching 58.7 km/h.

Q: What is the warmest month in Summit?

The warmest month in Summit is July (24.2 °C on average); the coldest is January (-1.0 °C).

Q: How much does it rain in Summit?

Summit receives on average 1,142 mm of precipitation per year, spread over about 121 rainy days.

Q: Is it sunny in Summit?

Summit gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.

Summit (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 1,142 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 (24.2 °C on average) and the coldest is January (-1.0 °C). Rainfall peaks in July.

Summit averages 84 frost days, 24 hot days (≥ 30 °C) and 121 rainy days per year.

Summit has warmed by +1.8 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The number of frost days there went from about 94 to 74 per year over the period.

The hottest day of the period reached 39.2 °C (on 6 July 2010) and the coldest -24.7 °C (on 22 January 1984).

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

SummitNew Jersey

coords: 40.72°, -74.36°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

11.7°C

Average daily high

15.9°C

Average daily low

7.9°C

Annual rainfall

1,142mm

Sunshine / day

8.8h

Mean relative humidity

70%

Average peak wind

17.1km/h

Seasonal range

25.2°C

Frost days (< 0 °C)

84 d/yr

Hot days (≥ 30 °C)

24 d/yr

Rainy days (≥ 1 mm)

121 d/yr

Annual snowfall

68.4 cm

Average feels-like high

14.4 °C

Average feels-like low

5.5 °C

Average peak gust

35.8 km/h

Tropical nights (≥ 20 °C)

43 d/yr

Solar radiation

14.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.8 °C

since 1940

+0.2 °C per decade · r² = 0.45 · 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

39.2 °C

6 July 2010

Coldest day

-24.7 °C

22 January 1984

Wettest day

149 mm

16 September 1999

Windiest day

58.7 km/h

29 October 2012

Strongest gust

139.0 km/h

25 November 1950

Hottest feels-like

43.1 °C

26 August 1948

Coldest feels-like

-30.0 °C

22 January 1984

Snowiest day

30.2 cm

23 January 2016

Sunniest day

14.2 h

19 June 2022

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.3 °C24 June 2025	-15.2 °C22 January 2025	12.5 °C	995 mm	36	89
2024	35.8 °C16 July 2024	-13.5 °C23 December 2024	13.3 °C	1,129 mm	29	58
2023	33.7 °C7 September 2023	-15.2 °C4 February 2023	13.4 °C	1,300 mm	23	49
2022	35.6 °C9 August 2022	-15.5 °C31 January 2022	12.9 °C	1,135 mm	42	90
2021	35.9 °C30 June 2021	-9.4 °C8 February 2021	13.2 °C	1,316 mm	32	67
2020	34.3 °C27 July 2020	-11.6 °C15 February 2020	13.2 °C	1,151 mm	37	55
2019	35.5 °C21 July 2019	-16.8 °C31 January 2019	12.5 °C	1,268 mm	30	89
2018	35.1 °C1 July 2018	-17.6 °C7 January 2018	12.6 °C	1,496 mm	37	77
2017	35.1 °C13 June 2017	-15.1 °C9 January 2017	12.9 °C	1,137 mm	28	70
2016	34.7 °C23 July 2016	-17.2 °C14 February 2016	13.2 °C	939 mm	44	69
2015	34.1 °C19 July 2015	-20.6 °C24 February 2015	12.5 °C	1,011 mm	35	83
2014	32.8 °C8 July 2014	-19.2 °C4 January 2014	11.3 °C	1,028 mm	20	94
2013	35.1 °C18 July 2013	-12.7 °C10 February 2013	12.0 °C	1,068 mm	23	88
2012	38.6 °C18 July 2012	-12.2 °C16 January 2012	13.5 °C	964 mm	35	53
2011	37.5 °C22 July 2011	-16.9 °C24 January 2011	12.8 °C	1,559 mm	33	78
2010	39.2 °C6 July 2010	-10.7 °C10 January 2010	13.1 °C	1,106 mm	57	79
2009	33.3 °C26 April 2009	-15.8 °C17 January 2009	11.7 °C	1,224 mm	15	86
2008	36.9 °C10 June 2008	-12.0 °C11 February 2008	12.3 °C	1,260 mm	26	85
2007	34.4 °C8 August 2007	-13.4 °C5 February 2007	12.3 °C	1,084 mm	30	85
2006	36.9 °C3 August 2006	-10.1 °C19 February 2006	13.1 °C	1,241 mm	31	59
2005	36.8 °C27 July 2005	-18.9 °C29 January 2005	12.2 °C	1,165 mm	41	87
2004	33.4 °C9 June 2004	-17.6 °C15 January 2004	11.7 °C	1,256 mm	11	85
2003	33.4 °C26 June 2003	-16.0 °C18 January 2003	11.1 °C	1,423 mm	17	92
2002	36.9 °C4 July 2002	-8.6 °C7 December 2002	12.8 °C	1,048 mm	46	72
2001	37.5 °C9 August 2001	-13.2 °C23 January 2001	12.5 °C	817 mm	20	78
2000	32.0 °C11 June 2000	-16.2 °C18 January 2000	11.3 °C	1,016 mm	13	88
1999	36.5 °C5 July 1999	-12.9 °C2 January 1999	12.5 °C	1,126 mm	32	71
1998	33.4 °C22 July 1998	-11.8 °C1 January 1998	13.1 °C	1,027 mm	17	48
1997	35.2 °C17 July 1997	-16.9 °C19 January 1997	11.6 °C	1,003 mm	22	74
1996	32.5 °C20 May 1996	-19.4 °C5 February 1996	11.1 °C	1,492 mm	5	78
1995	37.6 °C15 July 1995	-16.4 °C6 February 1995	12.0 °C	941 mm	31	89
1994	34.3 °C19 June 1994	-20.1 °C19 January 1994	11.8 °C	1,313 mm	21	86
1993	37.0 °C10 July 1993	-20.0 °C7 February 1993	11.9 °C	1,137 mm	37	83
1992	34.4 °C14 July 1992	-12.8 °C19 January 1992	11.1 °C	1,085 mm	11	82
1991	35.6 °C21 July 1991	-13.5 °C22 January 1991	12.8 °C	1,120 mm	36	71
1990	34.1 °C4 July 1990	-14.8 °C26 February 1990	12.8 °C	1,168 mm	13	63
1989	33.2 °C5 August 1989	-15.4 °C24 December 1989	11.3 °C	1,454 mm	21	96
1988	36.4 °C11 July 1988	-21.4 °C11 January 1988	11.4 °C	986 mm	40	89
1987	34.0 °C25 July 1987	-18.1 °C28 January 1987	11.7 °C	1,191 mm	32	80
1986	36.3 °C6 July 1986	-15.3 °C15 January 1986	11.8 °C	1,158 mm	18	87
1985	33.6 °C15 August 1985	-20.4 °C21 January 1985	11.9 °C	955 mm	13	84
1984	33.7 °C13 June 1984	-24.7 °C22 January 1984	11.6 °C	1,283 mm	19	79
1983	35.5 °C20 August 1983	-15.8 °C25 December 1983	12.1 °C	1,511 mm	45	72
1982	34.6 °C19 July 1982	-20.8 °C18 January 1982	11.3 °C	924 mm	12	85
1981	34.7 °C9 July 1981	-23.0 °C12 January 1981	11.4 °C	938 mm	23	90
1980	37.0 °C21 July 1980	-18.3 °C25 December 1980	11.3 °C	885 mm	35	101
1979	32.9 °C10 August 1979	-22.8 °C18 February 1979	11.4 °C	1,396 mm	11	75
1978	35.4 °C23 July 1978	-16.0 °C5 February 1978	10.5 °C	1,264 mm	15	98
1977	35.2 °C21 July 1977	-19.4 °C17 January 1977	11.4 °C	1,287 mm	27	89
1976	32.9 °C22 August 1976	-18.6 °C23 January 1976	11.1 °C	1,019 mm	18	104
1975	35.0 °C2 August 1975	-14.3 °C10 February 1975	12.1 °C	1,264 mm	12	75
1974	33.8 °C9 July 1974	-17.0 °C10 February 1974	11.7 °C	1,085 mm	16	82
1973	34.1 °C28 August 1973	-14.2 °C17 February 1973	12.2 °C	1,369 mm	21	65
1972	33.7 °C23 July 1972	-17.0 °C23 February 1972	11.0 °C	1,561 mm	19	90
1971	35.2 °C8 July 1971	-17.8 °C19 January 1971	11.7 °C	1,215 mm	21	77
1970	34.3 °C23 September 1970	-17.1 °C9 January 1970	11.3 °C	980 mm	25	98
1969	33.8 °C28 June 1969	-13.7 °C25 December 1969	11.3 °C	1,224 mm	16	107
1968	35.1 °C25 August 1968	-18.9 °C9 January 1968	11.2 °C	1,038 mm	27	91
1967	32.2 °C16 June 1967	-23.2 °C13 February 1967	10.5 °C	1,147 mm	12	95
1966	37.3 °C3 July 1966	-16.4 °C20 February 1966	11.2 °C	962 mm	29	86
1965	33.3 °C23 June 1965	-19.0 °C15 January 1965	10.9 °C	713 mm	23	95
1964	35.3 °C1 July 1964	-16.4 °C15 January 1964	11.2 °C	927 mm	21	97
1963	35.2 °C1 July 1963	-17.7 °C29 January 1963	10.7 °C	938 mm	17	100
1962	32.7 °C8 July 1962	-17.8 °C11 February 1962	10.5 °C	994 mm	16	97
1961	32.7 °C1 September 1961	-22.1 °C22 January 1961	11.0 °C	1,213 mm	19	90
1960	32.1 °C29 August 1960	-18.0 °C23 December 1960	10.8 °C	1,216 mm	7	110
1959	33.7 °C29 June 1959	-14.1 °C2 February 1959	12.1 °C	1,209 mm	28	89
1958	32.6 °C15 July 1958	-16.7 °C18 February 1958	10.5 °C	1,256 mm	14	82
1957	35.4 °C22 July 1957	-19.6 °C15 January 1957	11.9 °C	921 mm	22	78
1956	33.7 °C2 July 1956	-11.6 °C2 January 1956	11.1 °C	1,137 mm	14	81
1955	35.3 °C2 August 1955	-16.9 °C3 February 1955	11.7 °C	1,073 mm	33	96
1954	36.4 °C31 July 1954	-17.7 °C18 January 1954	11.6 °C	1,066 mm	16	85
1953	36.0 °C2 September 1953	-9.6 °C18 December 1953	12.6 °C	1,163 mm	31	60
1952	35.9 °C26 June 1952	-14.0 °C30 January 1952	11.9 °C	1,250 mm	25	75
1951	33.2 °C27 July 1951	-15.0 °C17 December 1951	11.7 °C	1,173 mm	14	83
1950	32.1 °C26 June 1950	-15.5 °C28 December 1950	11.1 °C	1,080 mm	10	94
1949	35.6 °C10 August 1949	-14.2 °C20 March 1949	12.6 °C	978 mm	32	76
1948	35.2 °C26 August 1948	-19.7 °C31 January 1948	10.9 °C	1,190 mm	16	91
1947	34.3 °C13 August 1947	-13.1 °C5 February 1947	11.2 °C	1,036 mm	11	98
1946	32.5 °C19 July 1946	-13.2 °C23 January 1946	11.9 °C	965 mm	11	74
1945	33.1 °C30 June 1945	-19.5 °C25 January 1945	11.2 °C	1,407 mm	15	86
1944	34.5 °C5 August 1944	-13.8 °C22 December 1944	11.1 °C	1,241 mm	31	104
1943	34.0 °C26 June 1943	-19.7 °C16 February 1943	10.7 °C	982 mm	26	109
1942	32.6 °C19 July 1942	-19.3 °C21 December 1942	11.0 °C	1,246 mm	6	95
1941	33.6 °C2 July 1941	-14.7 °C6 February 1941	11.2 °C	968 mm	13	102
1940	33.3 °C26 July 1940	-14.9 °C20 January 1940	10.2 °C	1,251 mm	9	98

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

16.7 °C

+0.8 °C

Hot days (≥ 30 °C)

36 d/yr

+12

Frost days (< 0 °C)

89 d/yr

Annual rainfall

995 mm

-147 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	1.8 °C	-0.8 °C	28 mm	-57 mm
Feb	4.3 °C	+0.3 °C	84 mm	+3 mm
Mar	12.7 °C	+4.0 °C	107 mm	+2 mm
Apr	16.9 °C	+1.7 °C	96 mm	-3 mm
May	20.6 °C	-0.2 °C	165 mm	+64 mm
Jun	26.9 °C	+1.1 °C	65 mm	-26 mm
Jul	30.9 °C	+2.4 °C	128 mm	+20 mm
Aug	27.1 °C	-0.3 °C	37 mm	-65 mm
Sep	25.2 °C	+1.7 °C	75 mm	-19 mm
Oct	18.3 °C	+0.8 °C	84 mm	-4 mm
Nov	11.2 °C	0.0 °C	55 mm	-37 mm
Dec	3.4 °C	-1.7 °C	71 mm	-26 mm

The year's extremes

Hottest day

37.3 °C

24 Jun 2025

Coldest day

-15.2 °C

22 Jan 2025

Wettest day

34.3 mm

30 Oct 2025

Windiest day

34.4 km/h

17 Feb 2025

Strongest gust

76.0 km/h

16 Mar 2025

Hottest feels-like

42.4 °C

23 Jun 2025

Coldest feels-like

-20.4 °C

22 Jan 2025

Snowiest day

7.3 cm

14 Dec 2025

Sunniest day

14.1 h

24 Jun 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 Summit?

Summit has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,142 mm of precipitation per year.

What is the hottest day ever recorded in Summit?

The hottest day measured in Summit between 1940 and 2025 was 6 July 2010, reaching 39.2 °C.

What is the coldest day in Summit?

The coldest day measured in Summit between 1940 and 2025 was 22 January 1984, at -24.7 °C.

Does it snow in Summit?

Yes. Summit gets on average 68.4 cm of snow per year and has around 84 frost days.

Has the climate of Summit warmed?

Yes: Summit warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Summit?

The wettest day measured in Summit between 1940 and 2025 was 16 September 1999, with 149 mm of rain in 24 hours.

What was the windiest day in Summit?

The windiest day measured in Summit between 1940 and 2025 was 29 October 2012, with winds reaching 58.7 km/h.

What is the warmest month in Summit?

The warmest month in Summit is July (24.2 °C on average); the coldest is January (-1.0 °C).

How much does it rain in Summit?

Summit receives on average 1,142 mm of precipitation per year, spread over about 121 rainy days.

Is it sunny in Summit?

Summit gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.

What is the biggest single-day snowfall in Summit?

The heaviest 24-hour snowfall measured in Summit between 1940 and 2025 was 23 January 2016, with 30.2 cm.

Are there tropical nights in Summit?

Yes: Summit has on average 43 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Summit?

In Summit, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 26 August 1948, and the lowest was -30.0 °C on 22 January 1984.

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