Pottstown climate — normals and trends

Q: What is the climate of Pottstown?

Pottstown has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,124 mm of precipitation per year.

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

The hottest day measured in Pottstown between 1940 and 2025 was 22 July 2011, reaching 40.4 °C.

Q: What is the coldest day in Pottstown?

The coldest day measured in Pottstown between 1940 and 2025 was 22 January 1984, at -26.8 °C.

Q: Does it snow in Pottstown?

Yes. Pottstown gets on average 65.1 cm of snow per year and has around 93 frost days.

Q: Has the climate of Pottstown warmed?

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

Q: What is the wettest day in Pottstown?

The wettest day measured in Pottstown between 1940 and 2025 was 16 September 1999, with 129 mm of rain in 24 hours.

Q: What was the windiest day in Pottstown?

The windiest day measured in Pottstown between 1940 and 2025 was 15 October 1954, with winds reaching 49.6 km/h.

Q: What is the warmest month in Pottstown?

The warmest month in Pottstown is July (24.1 °C on average); the coldest is January (-0.9 °C).

Q: How much does it rain in Pottstown?

Pottstown receives on average 1,124 mm of precipitation per year, spread over about 121 rainy days.

Q: Is it sunny in Pottstown?

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

Pottstown (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 1,124 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 (-0.9 °C). Rainfall peaks in July.

Pottstown averages 93 frost days, 35 hot days (≥ 30 °C) and 121 rainy days per year.

Pottstown 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 104 to 82 per year over the period.

The hottest day of the period reached 40.4 °C (on 22 July 2011) and the coldest -26.8 °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

PottstownPennsylvania

coords: 40.25°, -75.65°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

11.7°C

Average daily high

16.6°C

Average daily low

7.1°C

Annual rainfall

1,124mm

Sunshine / day

8.7h

Mean relative humidity

68%

Average peak wind

15.4km/h

Seasonal range

25.0°C

Frost days (< 0 °C)

93 d/yr

Hot days (≥ 30 °C)

35 d/yr

Rainy days (≥ 1 mm)

121 d/yr

Annual snowfall

65.1 cm

Average feels-like high

15.2 °C

Average feels-like low

4.8 °C

Average peak gust

37.2 km/h

Tropical nights (≥ 20 °C)

34 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 = 0.45 · 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

40.4 °C

22 July 2011

Coldest day

-26.8 °C

22 January 1984

Wettest day

129 mm

16 September 1999

Windiest day

49.6 km/h

15 October 1954

Strongest gust

125.6 km/h

25 November 1950

Hottest feels-like

44.7 °C

15 July 1995

Coldest feels-like

-32.1 °C

22 January 1984

Snowiest day

35.5 cm

23 January 2016

Sunniest day

14.2 h

24 June 2024

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.1 °C24 June 2025	-15.2 °C22 January 2025	12.5 °C	1,000 mm	42	92
2024	36.8 °C16 July 2024	-13.5 °C23 December 2024	13.4 °C	1,084 mm	41	63
2023	35.5 °C2 June 2023	-12.4 °C4 February 2023	13.6 °C	1,117 mm	37	59
2022	35.9 °C24 July 2022	-15.1 °C24 December 2022	12.8 °C	1,223 mm	51	96
2021	36.3 °C30 June 2021	-11.6 °C8 February 2021	13.2 °C	1,144 mm	52	82
2020	36.1 °C3 July 2020	-14.3 °C19 December 2020	13.4 °C	1,186 mm	46	64
2019	36.1 °C21 July 2019	-20.7 °C7 March 2019	12.7 °C	1,278 mm	42	95
2018	35.6 °C2 July 2018	-18.7 °C7 January 2018	12.6 °C	1,614 mm	45	86
2017	36.4 °C13 June 2017	-11.5 °C28 December 2017	13.1 °C	1,108 mm	39	72
2016	36.4 °C23 July 2016	-15.3 °C14 February 2016	13.2 °C	956 mm	64	80
2015	34.7 °C19 July 2015	-19.8 °C24 February 2015	12.6 °C	975 mm	52	91
2014	33.6 °C2 July 2014	-21.6 °C4 January 2014	11.2 °C	1,061 mm	27	99
2013	35.7 °C19 July 2013	-12.7 °C23 January 2013	12.0 °C	1,030 mm	32	98
2012	39.2 °C18 July 2012	-11.9 °C4 January 2012	13.6 °C	942 mm	50	70
2011	40.4 °C22 July 2011	-15.8 °C23 January 2011	12.8 °C	1,532 mm	39	92
2010	39.3 °C6 July 2010	-11.2 °C7 February 2010	13.1 °C	1,004 mm	73	89
2009	33.8 °C10 August 2009	-15.2 °C17 January 2009	11.8 °C	1,172 mm	18	88
2008	36.7 °C10 June 2008	-13.3 °C11 February 2008	12.2 °C	1,231 mm	37	90
2007	36.3 °C8 August 2007	-14.3 °C5 February 2007	12.5 °C	1,033 mm	55	90
2006	37.0 °C3 August 2006	-11.4 °C19 February 2006	13.1 °C	1,163 mm	46	69
2005	36.3 °C27 July 2005	-18.4 °C28 January 2005	12.3 °C	1,014 mm	58	90
2004	33.4 °C9 June 2004	-18.9 °C25 January 2004	11.8 °C	1,244 mm	19	93
2003	33.9 °C22 August 2003	-19.8 °C18 January 2003	11.1 °C	1,432 mm	21	98
2002	37.7 °C2 August 2002	-11.5 °C9 December 2002	12.7 °C	1,109 mm	52	81
2001	38.7 °C9 August 2001	-19.6 °C23 January 2001	12.5 °C	792 mm	36	87
2000	33.9 °C10 July 2000	-14.8 °C3 February 2000	11.3 °C	1,023 mm	15	96
1999	36.7 °C5 July 1999	-12.7 °C23 February 1999	12.4 °C	1,076 mm	42	83
1998	33.6 °C22 July 1998	-16.9 °C1 January 1998	13.2 °C	1,025 mm	39	65
1997	36.5 °C15 July 1997	-20.1 °C19 January 1997	11.6 °C	913 mm	37	87
1996	34.1 °C20 May 1996	-19.4 °C5 February 1996	10.9 °C	1,523 mm	7	93
1995	38.8 °C15 July 1995	-17.9 °C8 February 1995	12.0 °C	1,040 mm	48	101
1994	36.5 °C15 June 1994	-23.2 °C19 January 1994	11.8 °C	1,258 mm	40	93
1993	36.4 °C28 August 1993	-16.6 °C19 March 1993	11.8 °C	1,222 mm	55	95
1992	36.3 °C14 July 1992	-13.5 °C19 January 1992	11.2 °C	960 mm	24	93
1991	37.5 °C23 July 1991	-13.7 °C22 January 1991	13.0 °C	1,008 mm	66	86
1990	36.5 °C4 July 1990	-13.3 °C26 February 1990	12.8 °C	1,192 mm	28	77
1989	33.3 °C27 June 1989	-15.7 °C23 December 1989	11.1 °C	1,355 mm	23	103
1988	37.7 °C16 July 1988	-19.5 °C29 January 1988	11.4 °C	953 mm	54	107
1987	36.4 °C21 July 1987	-20.6 °C28 January 1987	11.8 °C	1,177 mm	40	93
1986	36.2 °C7 July 1986	-14.7 °C28 January 1986	11.7 °C	1,156 mm	34	94
1985	34.9 °C14 August 1985	-23.6 °C21 January 1985	11.7 °C	968 mm	21	95
1984	34.1 °C13 June 1984	-26.8 °C22 January 1984	11.4 °C	1,323 mm	21	93
1983	36.1 °C20 August 1983	-18.9 °C25 December 1983	11.6 °C	1,417 mm	52	90
1982	33.5 °C19 July 1982	-21.3 °C17 January 1982	11.1 °C	1,060 mm	17	97
1981	34.1 °C16 June 1981	-22.5 °C12 January 1981	11.2 °C	949 mm	30	94
1980	37.5 °C21 July 1980	-17.5 °C25 December 1980	11.4 °C	850 mm	52	101
1979	34.9 °C10 August 1979	-25.2 °C18 February 1979	11.5 °C	1,255 mm	27	87
1978	35.5 °C23 July 1978	-18.7 °C5 February 1978	10.4 °C	1,346 mm	25	104
1977	35.9 °C19 July 1977	-20.5 °C17 January 1977	11.3 °C	1,186 mm	36	101
1976	32.9 °C28 June 1976	-17.4 °C23 January 1976	11.0 °C	1,060 mm	31	108
1975	34.2 °C2 August 1975	-15.5 °C10 February 1975	11.9 °C	1,365 mm	21	92
1974	34.4 °C10 June 1974	-16.2 °C14 January 1974	11.7 °C	1,062 mm	24	94
1973	35.4 °C28 August 1973	-15.7 °C17 February 1973	12.1 °C	1,294 mm	28	79
1972	34.3 °C23 July 1972	-16.3 °C23 February 1972	11.0 °C	1,402 mm	22	96
1971	35.6 °C8 July 1971	-20.3 °C1 February 1971	11.7 °C	1,198 mm	34	89
1970	33.5 °C23 September 1970	-17.4 °C9 January 1970	11.4 °C	1,005 mm	38	104
1969	34.4 °C17 July 1969	-16.5 °C25 December 1969	11.1 °C	1,237 mm	20	113
1968	36.8 °C1 July 1968	-20.8 °C2 January 1968	11.4 °C	934 mm	47	99
1967	34.4 °C12 June 1967	-23.7 °C13 February 1967	10.7 °C	1,087 mm	27	102
1966	39.3 °C3 July 1966	-17.3 °C29 January 1966	11.0 °C	991 mm	47	102
1965	34.8 °C25 July 1965	-19.9 °C15 January 1965	10.9 °C	754 mm	31	100
1964	36.5 °C30 June 1964	-17.2 °C15 January 1964	11.3 °C	982 mm	40	104
1963	35.4 °C27 June 1963	-23.3 °C29 January 1963	10.5 °C	933 mm	25	106
1962	34.7 °C8 July 1962	-22.5 °C11 February 1962	10.6 °C	1,010 mm	28	117
1961	33.3 °C2 July 1961	-22.3 °C22 January 1961	11.0 °C	1,153 mm	29	96
1960	32.5 °C30 August 1960	-21.7 °C23 December 1960	10.8 °C	1,228 mm	18	117
1959	36.0 °C29 June 1959	-15.2 °C23 December 1959	12.2 °C	1,106 mm	49	98
1958	32.8 °C2 July 1958	-19.3 °C11 February 1958	10.5 °C	1,219 mm	21	92
1957	36.7 °C21 July 1957	-20.9 °C18 January 1957	11.8 °C	947 mm	36	87
1956	34.6 °C14 June 1956	-10.0 °C18 March 1956	11.2 °C	1,195 mm	24	91
1955	37.9 °C22 July 1955	-18.6 °C3 February 1955	11.8 °C	975 mm	45	105
1954	37.9 °C31 July 1954	-21.1 °C18 January 1954	11.8 °C	948 mm	34	93
1953	38.7 °C3 September 1953	-10.5 °C18 December 1953	12.5 °C	1,084 mm	45	80
1952	36.7 °C26 June 1952	-13.8 °C30 January 1952	11.8 °C	1,341 mm	37	87
1951	33.4 °C27 July 1951	-19.6 °C17 December 1951	11.6 °C	1,182 mm	25	88
1950	32.8 °C26 June 1950	-17.0 °C27 December 1950	11.1 °C	1,112 mm	17	108
1949	36.3 °C4 July 1949	-16.4 °C20 March 1949	12.6 °C	955 mm	40	81
1948	35.9 °C26 August 1948	-21.7 °C19 January 1948	10.9 °C	1,254 mm	22	100
1947	33.5 °C14 August 1947	-14.9 °C5 February 1947	11.1 °C	1,085 mm	17	108
1946	32.9 °C19 July 1946	-15.5 °C28 January 1946	11.9 °C	1,019 mm	16	84
1945	33.8 °C1 July 1945	-19.2 °C25 January 1945	11.0 °C	1,439 mm	17	98
1944	34.8 °C5 August 1944	-15.2 °C9 January 1944	11.1 °C	1,147 mm	38	110
1943	33.9 °C25 June 1943	-19.3 °C16 February 1943	10.6 °C	926 mm	35	117
1942	33.7 °C19 July 1942	-21.0 °C11 January 1942	11.0 °C	1,237 mm	15	105
1941	34.7 °C28 July 1941	-15.0 °C10 February 1941	11.2 °C	935 mm	25	112
1940	33.6 °C26 July 1940	-16.9 °C20 January 1940	10.0 °C	1,231 mm	12	112

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

17.4 °C

+0.8 °C

Hot days (≥ 30 °C)

42 d/yr

Frost days (< 0 °C)

92 d/yr

-1

Annual rainfall

1000 mm

-124 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	1.8 °C	-1.2 °C	27 mm	-54 mm
Feb	5.1 °C	+0.4 °C	72 mm	-6 mm
Mar	14.8 °C	+5.0 °C	85 mm	-14 mm
Apr	18.0 °C	+1.7 °C	91 mm	-8 mm
May	21.5 °C	-0.4 °C	171 mm	+68 mm
Jun	27.7 °C	+0.9 °C	98 mm	+1 mm
Jul	30.9 °C	+1.6 °C	169 mm	+61 mm
Aug	27.7 °C	-0.4 °C	17 mm	-82 mm
Sep	26.2 °C	+1.9 °C	78 mm	-17 mm
Oct	18.8 °C	+0.8 °C	84 mm	+1 mm
Nov	11.7 °C	+0.3 °C	47 mm	-40 mm
Dec	3.5 °C	-1.8 °C	60 mm	-32 mm

The year's extremes

Hottest day

37.1 °C

24 Jun 2025

Coldest day

-15.2 °C

22 Jan 2025

Wettest day

55.3 mm

31 Jul 2025

Windiest day

32.5 km/h

11 Nov 2025

Strongest gust

84.2 km/h

5 Mar 2025

Hottest feels-like

42.0 °C

23 Jun 2025

Coldest feels-like

-20.0 °C

21 Jan 2025

Snowiest day

6.9 cm

14 Dec 2025

Sunniest day

14.1 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 Pottstown?

Pottstown has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.7 °C and it receives 1,124 mm of precipitation per year.

What is the hottest day ever recorded in Pottstown?

The hottest day measured in Pottstown between 1940 and 2025 was 22 July 2011, reaching 40.4 °C.

What is the coldest day in Pottstown?

The coldest day measured in Pottstown between 1940 and 2025 was 22 January 1984, at -26.8 °C.

Does it snow in Pottstown?

Yes. Pottstown gets on average 65.1 cm of snow per year and has around 93 frost days.

Has the climate of Pottstown warmed?

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

What is the wettest day in Pottstown?

The wettest day measured in Pottstown between 1940 and 2025 was 16 September 1999, with 129 mm of rain in 24 hours.

What was the windiest day in Pottstown?

The windiest day measured in Pottstown between 1940 and 2025 was 15 October 1954, with winds reaching 49.6 km/h.

What is the warmest month in Pottstown?

The warmest month in Pottstown is July (24.1 °C on average); the coldest is January (-0.9 °C).

How much does it rain in Pottstown?

Pottstown receives on average 1,124 mm of precipitation per year, spread over about 121 rainy days.

Is it sunny in Pottstown?

Pottstown 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 Pottstown?

The heaviest 24-hour snowfall measured in Pottstown between 1940 and 2025 was 23 January 2016, with 35.5 cm.

Are there tropical nights in Pottstown?

Yes: Pottstown has on average 34 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Pottstown?

In Pottstown, between 1940 and 2025, the highest apparent temperature reached 44.7 °C on 15 July 1995, and the lowest was -32.1 °C on 22 January 1984.

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