Willow Grove climate — normals and trends

Q: What is the climate of Willow Grove?

Willow Grove has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.2 °C and it receives 1,146 mm of precipitation per year.

Q: What is the hottest day ever recorded in Willow Grove?

The hottest day measured in Willow Grove between 1940 and 2025 was 22 July 2011, reaching 40.3 °C.

Q: What is the coldest day in Willow Grove?

The coldest day measured in Willow Grove between 1940 and 2025 was 22 January 1984, at -25.4 °C.

Q: Does it snow in Willow Grove?

Yes. Willow Grove gets on average 58.7 cm of snow per year and has around 85 frost days.

Q: Has the climate of Willow Grove warmed?

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

Q: What is the wettest day in Willow Grove?

The wettest day measured in Willow Grove between 1940 and 2025 was 16 September 1999, with 146 mm of rain in 24 hours.

Q: What was the windiest day in Willow Grove?

The windiest day measured in Willow Grove between 1940 and 2025 was 25 November 1950, with winds reaching 50.6 km/h.

Q: What is the warmest month in Willow Grove?

The warmest month in Willow Grove is July (24.4 °C on average); the coldest is January (-0.2 °C).

Q: How much does it rain in Willow Grove?

Willow Grove receives on average 1,146 mm of precipitation per year, spread over about 121 rainy days.

Q: Is it sunny in Willow Grove?

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

Willow Grove (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.2 °C and it receives 1,146 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 (24.4 °C on average) and the coldest is January (-0.2 °C). Rainfall peaks in July.

Willow Grove averages 85 frost days, 35 hot days (≥ 30 °C) and 121 rainy days per year.

Willow Grove has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.

The number of frost days there went from about 94 to 76 per year over the period.

The hottest day of the period reached 40.3 °C (on 22 July 2011) and the coldest -25.4 °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

Willow GrovePennsylvania

coords: 40.14°, -75.12°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

12.2°C

Average daily high

16.9°C

Average daily low

7.8°C

Annual rainfall

1,146mm

Sunshine / day

8.7h

Mean relative humidity

67%

Average peak wind

16.4km/h

Seasonal range

24.6°C

Frost days (< 0 °C)

85 d/yr

Hot days (≥ 30 °C)

35 d/yr

Rainy days (≥ 1 mm)

121 d/yr

Annual snowfall

58.7 cm

Average feels-like high

15.5 °C

Average feels-like low

5.4 °C

Average peak gust

38.0 km/h

Tropical nights (≥ 20 °C)

40 d/yr

Solar radiation

14.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.8 °C

since 1940

+0.2 °C per decade · r² = 0.42 · 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

40.3 °C

22 July 2011

Coldest day

-25.4 °C

22 January 1984

Wettest day

146 mm

16 September 1999

Windiest day

50.6 km/h

25 November 1950

Strongest gust

142.6 km/h

25 November 1950

Hottest feels-like

44.8 °C

22 July 2011

Coldest feels-like

-30.5 °C

22 January 1984

Snowiest day

36.3 cm

23 January 2016

Sunniest day

14.1 h

22 June 1949

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.6 °C24 June 2025	-13.8 °C22 January 2025	12.9 °C	1,018 mm	42	90
2024	36.2 °C16 July 2024	-14.8 °C23 December 2024	13.7 °C	1,149 mm	43	61
2023	34.7 °C2 June 2023	-12.6 °C4 February 2023	13.8 °C	1,213 mm	33	54
2022	35.9 °C9 August 2022	-14.6 °C24 December 2022	13.3 °C	1,237 mm	52	92
2021	35.8 °C30 June 2021	-9.6 °C8 February 2021	13.6 °C	1,145 mm	46	74
2020	35.9 °C3 July 2020	-11.5 °C19 December 2020	13.7 °C	1,258 mm	47	55
2019	36.6 °C21 July 2019	-16.2 °C31 January 2019	13.1 °C	1,295 mm	42	87
2018	35.2 °C2 July 2018	-16.9 °C7 January 2018	13.0 °C	1,555 mm	47	79
2017	35.5 °C13 June 2017	-14.5 °C9 January 2017	13.4 °C	1,153 mm	36	69
2016	35.8 °C23 July 2016	-15.2 °C14 February 2016	13.5 °C	963 mm	56	70
2015	34.6 °C19 July 2015	-17.3 °C20 February 2015	13.1 °C	1,006 mm	50	86
2014	33.7 °C2 July 2014	-20.4 °C4 January 2014	11.6 °C	1,099 mm	25	94
2013	34.8 °C18 July 2013	-12.4 °C23 January 2013	12.3 °C	1,118 mm	27	90
2012	39.2 °C18 July 2012	-11.7 °C4 January 2012	13.9 °C	941 mm	49	64
2011	40.3 °C22 July 2011	-15.0 °C24 January 2011	13.4 °C	1,556 mm	44	83
2010	39.0 °C6 July 2010	-12.5 °C30 December 2010	13.5 °C	1,039 mm	74	83
2009	33.9 °C10 August 2009	-14.6 °C17 January 2009	12.2 °C	1,269 mm	18	84
2008	37.2 °C10 June 2008	-12.6 °C11 February 2008	12.7 °C	1,202 mm	35	86
2007	35.9 °C8 August 2007	-13.3 °C26 January 2007	12.8 °C	1,062 mm	46	86
2006	36.4 °C3 August 2006	-10.8 °C19 February 2006	13.5 °C	1,289 mm	41	63
2005	36.2 °C27 July 2005	-18.0 °C29 January 2005	12.6 °C	1,040 mm	48	85
2004	33.5 °C9 June 2004	-17.2 °C16 January 2004	12.2 °C	1,249 mm	24	85
2003	34.6 °C5 July 2003	-15.9 °C14 February 2003	11.6 °C	1,369 mm	28	91
2002	36.9 °C4 July 2002	-10.7 °C7 December 2002	13.1 °C	1,104 mm	52	74
2001	38.7 °C9 August 2001	-15.4 °C23 January 2001	12.9 °C	792 mm	35	82
2000	34.1 °C10 July 2000	-14.8 °C18 January 2000	11.8 °C	1,012 mm	18	93
1999	37.1 °C5 July 1999	-11.9 °C2 January 1999	12.9 °C	1,127 mm	46	75
1998	34.9 °C22 July 1998	-13.3 °C1 January 1998	13.6 °C	1,006 mm	40	53
1997	36.2 °C17 July 1997	-16.4 °C19 January 1997	12.0 °C	973 mm	37	77
1996	34.6 °C20 May 1996	-18.9 °C5 February 1996	11.5 °C	1,485 mm	10	81
1995	38.8 °C15 July 1995	-16.3 °C8 February 1995	12.4 °C	1,016 mm	46	94
1994	36.1 °C19 June 1994	-20.8 °C19 January 1994	12.4 °C	1,248 mm	38	85
1993	36.7 °C10 July 1993	-17.1 °C7 February 1993	12.3 °C	1,221 mm	46	83
1992	36.0 °C14 July 1992	-12.7 °C19 January 1992	11.6 °C	1,007 mm	23	84
1991	37.0 °C23 July 1991	-13.2 °C22 January 1991	13.3 °C	1,101 mm	58	81
1990	35.5 °C4 July 1990	-13.8 °C26 February 1990	13.3 °C	1,151 mm	31	63
1989	33.9 °C10 September 1989	-15.2 °C23 December 1989	11.7 °C	1,396 mm	27	97
1988	36.7 °C17 July 1988	-22.8 °C11 January 1988	11.7 °C	1,012 mm	53	92
1987	35.2 °C21 July 1987	-21.8 °C28 January 1987	12.1 °C	1,289 mm	38	78
1986	36.4 °C7 July 1986	-13.4 °C15 January 1986	12.1 °C	1,258 mm	31	88
1985	34.4 °C14 August 1985	-22.0 °C21 January 1985	12.2 °C	975 mm	20	91
1984	34.6 °C8 June 1984	-25.4 °C22 January 1984	11.9 °C	1,340 mm	27	83
1983	36.4 °C20 August 1983	-17.5 °C25 December 1983	12.2 °C	1,536 mm	49	76
1982	34.3 °C19 July 1982	-20.5 °C17 January 1982	11.6 °C	1,003 mm	12	91
1981	34.4 °C9 July 1981	-23.1 °C12 January 1981	11.6 °C	1,035 mm	31	91
1980	37.1 °C21 July 1980	-16.5 °C25 December 1980	11.7 °C	886 mm	49	96
1979	33.8 °C10 August 1979	-22.7 °C18 February 1979	11.9 °C	1,369 mm	21	79
1978	35.7 °C23 July 1978	-19.2 °C5 February 1978	10.7 °C	1,371 mm	26	100
1977	35.9 °C19 July 1977	-19.8 °C17 January 1977	11.8 °C	1,254 mm	31	92
1976	32.9 °C18 April 1976	-17.3 °C23 January 1976	11.5 °C	996 mm	32	99
1975	35.1 °C2 August 1975	-9.7 °C10 February 1975	12.5 °C	1,314 mm	25	83
1974	34.6 °C9 July 1974	-13.5 °C14 January 1974	12.3 °C	1,064 mm	31	85
1973	35.2 °C28 August 1973	-14.4 °C17 February 1973	12.6 °C	1,304 mm	35	69
1972	34.7 °C23 July 1972	-16.0 °C23 February 1972	11.5 °C	1,502 mm	30	90
1971	35.7 °C8 July 1971	-17.6 °C1 February 1971	12.2 °C	1,304 mm	28	76
1970	34.2 °C23 September 1970	-16.7 °C9 January 1970	11.9 °C	988 mm	37	94
1969	34.8 °C17 July 1969	-12.8 °C25 December 1969	11.6 °C	1,232 mm	26	103
1968	37.2 °C1 July 1968	-19.4 °C12 January 1968	11.8 °C	968 mm	41	92
1967	34.3 °C16 June 1967	-21.5 °C13 February 1967	11.1 °C	1,124 mm	21	91
1966	40.2 °C3 July 1966	-16.3 °C29 January 1966	11.6 °C	953 mm	46	93
1965	34.3 °C25 July 1965	-18.0 °C15 January 1965	11.4 °C	725 mm	35	91
1964	36.3 °C30 June 1964	-16.9 °C15 January 1964	11.8 °C	974 mm	42	92
1963	36.0 °C27 June 1963	-20.2 °C29 January 1963	11.2 °C	949 mm	22	99
1962	34.6 °C19 May 1962	-18.5 °C11 February 1962	11.0 °C	1,003 mm	26	108
1961	33.6 °C2 July 1961	-23.1 °C22 January 1961	11.5 °C	1,194 mm	37	87
1960	32.3 °C29 August 1960	-19.5 °C23 December 1960	11.3 °C	1,233 mm	19	105
1959	36.0 °C29 June 1959	-13.9 °C23 December 1959	12.6 °C	1,132 mm	51	94
1958	33.1 °C2 July 1958	-15.2 °C17 February 1958	11.0 °C	1,321 mm	26	85
1957	36.6 °C22 July 1957	-18.9 °C18 January 1957	12.3 °C	955 mm	36	77
1956	35.5 °C2 July 1956	-9.0 °C18 March 1956	11.6 °C	1,171 mm	28	79
1955	37.5 °C22 July 1955	-17.6 °C3 February 1955	12.2 °C	976 mm	47	98
1954	37.3 °C31 July 1954	-18.4 °C18 January 1954	12.2 °C	982 mm	31	87
1953	38.6 °C2 September 1953	-9.9 °C18 December 1953	13.0 °C	1,085 mm	44	64
1952	37.2 °C26 June 1952	-13.0 °C30 January 1952	12.3 °C	1,330 mm	36	79
1951	33.7 °C27 July 1951	-15.4 °C17 December 1951	12.2 °C	1,157 mm	32	77
1950	33.2 °C26 June 1950	-13.6 °C27 December 1950	11.6 °C	1,076 mm	22	98
1949	36.3 °C4 July 1949	-13.3 °C20 March 1949	13.1 °C	936 mm	44	73
1948	36.5 °C26 August 1948	-19.3 °C19 January 1948	11.4 °C	1,299 mm	24	92
1947	33.9 °C14 August 1947	-14.2 °C5 February 1947	11.7 °C	1,046 mm	20	101
1946	32.8 °C20 July 1946	-15.1 °C23 January 1946	12.4 °C	1,023 mm	16	74
1945	34.0 °C30 June 1945	-18.8 °C25 January 1945	11.6 °C	1,420 mm	18	86
1944	35.2 °C5 August 1944	-13.6 °C22 December 1944	11.6 °C	1,187 mm	40	102
1943	34.2 °C25 June 1943	-17.0 °C15 February 1943	11.2 °C	958 mm	38	106
1942	34.0 °C19 July 1942	-19.7 °C11 January 1942	11.5 °C	1,230 mm	20	93
1941	34.9 °C28 July 1941	-14.2 °C10 February 1941	11.8 °C	991 mm	30	98
1940	34.1 °C26 July 1940	-15.7 °C20 January 1940	10.6 °C	1,283 mm	13	100

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

17.6 °C

+0.7 °C

Hot days (≥ 30 °C)

42 d/yr

Frost days (< 0 °C)

90 d/yr

Annual rainfall

1018 mm

-128 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.4 °C	-1.2 °C	27 mm	-57 mm
Feb	5.6 °C	+0.3 °C	76 mm	-4 mm
Mar	14.8 °C	+4.6 °C	101 mm	-3 mm
Apr	18.2 °C	+1.7 °C	99 mm	-1 mm
May	21.8 °C	-0.2 °C	163 mm	+60 mm
Jun	27.7 °C	+0.8 °C	75 mm	-20 mm
Jul	30.9 °C	+1.6 °C	170 mm	+59 mm
Aug	27.6 °C	-0.5 °C	21 mm	-88 mm
Sep	26.1 °C	+1.7 °C	89 mm	-5 mm
Oct	19.2 °C	+0.8 °C	76 mm	-9 mm
Nov	12.1 °C	+0.1 °C	53 mm	-36 mm
Dec	4.0 °C	-1.9 °C	69 mm	-27 mm

The year's extremes

Hottest day

37.6 °C

24 Jun 2025

Coldest day

-13.8 °C

22 Jan 2025

Wettest day

48.8 mm

31 Jul 2025

Windiest day

35.0 km/h

16 Feb 2025

Strongest gust

81.7 km/h

16 Feb 2025

Hottest feels-like

42.4 °C

23 Jun 2025

Coldest feels-like

-18.6 °C

22 Jan 2025

Snowiest day

8.3 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 Willow Grove?

Willow Grove has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.2 °C and it receives 1,146 mm of precipitation per year.

What is the hottest day ever recorded in Willow Grove?

The hottest day measured in Willow Grove between 1940 and 2025 was 22 July 2011, reaching 40.3 °C.

What is the coldest day in Willow Grove?

The coldest day measured in Willow Grove between 1940 and 2025 was 22 January 1984, at -25.4 °C.

Does it snow in Willow Grove?

Yes. Willow Grove gets on average 58.7 cm of snow per year and has around 85 frost days.

Has the climate of Willow Grove warmed?

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

What is the wettest day in Willow Grove?

The wettest day measured in Willow Grove between 1940 and 2025 was 16 September 1999, with 146 mm of rain in 24 hours.

What was the windiest day in Willow Grove?

The windiest day measured in Willow Grove between 1940 and 2025 was 25 November 1950, with winds reaching 50.6 km/h.

What is the warmest month in Willow Grove?

The warmest month in Willow Grove is July (24.4 °C on average); the coldest is January (-0.2 °C).

How much does it rain in Willow Grove?

Willow Grove receives on average 1,146 mm of precipitation per year, spread over about 121 rainy days.

Is it sunny in Willow Grove?

Willow Grove 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 Willow Grove?

The heaviest 24-hour snowfall measured in Willow Grove between 1940 and 2025 was 23 January 2016, with 36.3 cm.

Are there tropical nights in Willow Grove?

Yes: Willow Grove has on average 40 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Willow Grove?

In Willow Grove, between 1940 and 2025, the highest apparent temperature reached 44.8 °C on 22 July 2011, and the lowest was -30.5 °C on 22 January 1984.

Compare Willow Grove with another city

Pick a second city: its normals will be set against these, indicator by indicator.

Nearby cities

The climate around Willow Grove

Other cities — United States

All cities in United States →