Radnor climate — normals and trends

Q: What is the climate of Radnor?

Radnor has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,095 mm of precipitation per year.

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

The hottest day measured in Radnor between 1940 and 2025 was 22 July 2011, reaching 41.0 °C.

Q: What is the coldest day in Radnor?

The coldest day measured in Radnor between 1940 and 2025 was 22 January 1984, at -25.5 °C.

Q: Does it snow in Radnor?

Yes. Radnor gets on average 52.1 cm of snow per year and has around 79 frost days.

Q: Has the climate of Radnor warmed?

Yes: Radnor warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Radnor?

The wettest day measured in Radnor between 1940 and 2025 was 16 September 1999, with 147 mm of rain in 24 hours.

Q: What was the windiest day in Radnor?

The windiest day measured in Radnor between 1940 and 2025 was 15 October 1954, with winds reaching 53.8 km/h.

Q: What is the warmest month in Radnor?

The warmest month in Radnor is July (24.9 °C on average); the coldest is January (0.3 °C).

Q: How much does it rain in Radnor?

Radnor receives on average 1,095 mm of precipitation per year, spread over about 116 rainy days.

Q: Is it sunny in Radnor?

Radnor gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

Radnor (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.7 °C and it receives 1,095 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 (24.9 °C on average) and the coldest is January (0.3 °C). Rainfall peaks in July.

Radnor averages 79 frost days, 41 hot days (≥ 30 °C) and 116 rainy days per year.

Radnor has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The number of frost days there went from about 87 to 71 per year over the period.

The hottest day of the period reached 41.0 °C (on 22 July 2011) and the coldest -25.5 °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

RadnorPennsylvania

coords: 40.05°, -75.36°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

12.7°C

Average daily high

17.4°C

Average daily low

8.4°C

Annual rainfall

1,095mm

Sunshine / day

8.9h

Mean relative humidity

66%

Average peak wind

17.2km/h

Seasonal range

24.6°C

Frost days (< 0 °C)

79 d/yr

Hot days (≥ 30 °C)

41 d/yr

Rainy days (≥ 1 mm)

116 d/yr

Annual snowfall

52.1 cm

Average feels-like high

16.0 °C

Average feels-like low

6.1 °C

Average peak gust

37.4 km/h

Tropical nights (≥ 20 °C)

49 d/yr

Solar radiation

14.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.40 · 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

41.0 °C

22 July 2011

Coldest day

-25.5 °C

22 January 1984

Wettest day

147 mm

16 September 1999

Windiest day

53.8 km/h

15 October 1954

Strongest gust

134.3 km/h

25 November 1950

Hottest feels-like

45.7 °C

15 July 1995

Coldest feels-like

-30.5 °C

22 January 1984

Snowiest day

36.9 cm

20 March 1958

Sunniest day

14.1 h

24 June 2024

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.7 °C24 June 2025	-13.0 °C22 January 2025	13.4 °C	954 mm	49	83
2024	36.8 °C16 July 2024	-13.7 °C23 December 2024	14.2 °C	1,124 mm	50	58
2023	35.8 °C6 September 2023	-10.9 °C4 February 2023	14.4 °C	1,127 mm	46	38
2022	35.9 °C9 August 2022	-14.2 °C24 December 2022	13.7 °C	1,260 mm	52	89
2021	35.6 °C30 June 2021	-9.7 °C8 February 2021	14.1 °C	1,077 mm	52	65
2020	36.5 °C3 July 2020	-12.2 °C19 December 2020	14.2 °C	1,295 mm	51	55
2019	37.4 °C21 July 2019	-15.4 °C31 January 2019	13.8 °C	1,198 mm	50	76
2018	35.5 °C2 July 2018	-17.2 °C7 January 2018	13.6 °C	1,547 mm	51	70
2017	36.5 °C13 June 2017	-12.9 °C9 January 2017	14.0 °C	1,071 mm	46	61
2016	36.2 °C14 August 2016	-14.0 °C14 February 2016	14.0 °C	913 mm	60	69
2015	35.2 °C20 July 2015	-16.5 °C20 February 2015	13.7 °C	998 mm	56	76
2014	34.2 °C18 June 2014	-20.1 °C23 January 2014	12.1 °C	1,068 mm	28	89
2013	35.9 °C18 July 2013	-12.0 °C23 January 2013	12.9 °C	1,029 mm	39	85
2012	39.2 °C18 July 2012	-11.0 °C4 January 2012	14.4 °C	915 mm	52	55
2011	41.0 °C22 July 2011	-13.2 °C23 January 2011	13.9 °C	1,421 mm	49	78
2010	39.2 °C6 July 2010	-12.7 °C30 December 2010	13.9 °C	1,003 mm	76	79
2009	34.1 °C10 August 2009	-14.2 °C17 January 2009	12.7 °C	1,224 mm	19	82
2008	37.3 °C10 June 2008	-11.6 °C11 February 2008	13.3 °C	1,097 mm	50	80
2007	36.4 °C8 August 2007	-12.7 °C26 January 2007	13.3 °C	1,037 mm	52	81
2006	36.3 °C17 July 2006	-10.4 °C19 February 2006	13.9 °C	1,223 mm	45	59
2005	37.2 °C27 July 2005	-16.6 °C28 January 2005	13.0 °C	992 mm	52	79
2004	33.8 °C9 June 2004	-16.2 °C16 January 2004	12.8 °C	1,130 mm	30	78
2003	35.4 °C5 July 2003	-14.1 °C18 January 2003	12.2 °C	1,368 mm	34	86
2002	37.5 °C4 July 2002	-11.6 °C7 December 2002	13.7 °C	1,088 mm	57	69
2001	39.4 °C9 August 2001	-15.0 °C23 January 2001	13.5 °C	772 mm	38	78
2000	35.4 °C11 June 2000	-14.5 °C30 January 2000	12.4 °C	982 mm	22	89
1999	37.8 °C6 July 1999	-11.0 °C2 January 1999	13.4 °C	1,068 mm	52	70
1998	35.7 °C22 July 1998	-11.6 °C1 January 1998	14.1 °C	957 mm	43	47
1997	36.4 °C17 July 1997	-15.6 °C19 January 1997	12.5 °C	953 mm	39	71
1996	35.4 °C20 May 1996	-18.3 °C5 February 1996	12.1 °C	1,406 mm	16	78
1995	39.0 °C15 July 1995	-15.6 °C6 February 1995	13.0 °C	966 mm	51	83
1994	37.1 °C19 June 1994	-20.5 °C19 January 1994	13.0 °C	1,140 mm	51	81
1993	37.2 °C10 July 1993	-17.7 °C7 February 1993	12.8 °C	1,131 mm	50	77
1992	36.6 °C14 July 1992	-11.9 °C19 January 1992	12.2 °C	972 mm	26	80
1991	37.6 °C23 July 1991	-12.2 °C22 January 1991	13.8 °C	1,064 mm	61	72
1990	36.3 °C4 July 1990	-11.9 °C26 February 1990	13.9 °C	1,042 mm	36	55
1989	34.4 °C27 June 1989	-14.4 °C23 December 1989	12.2 °C	1,303 mm	31	94
1988	37.2 °C17 July 1988	-17.8 °C11 January 1988	12.3 °C	914 mm	56	89
1987	36.0 °C21 July 1987	-21.1 °C28 January 1987	12.6 °C	1,170 mm	43	75
1986	37.2 °C7 July 1986	-13.1 °C28 January 1986	12.7 °C	1,075 mm	41	82
1985	35.2 °C14 August 1985	-22.1 °C21 January 1985	12.8 °C	905 mm	28	86
1984	35.4 °C9 June 1984	-25.5 °C22 January 1984	12.5 °C	1,302 mm	34	79
1983	36.5 °C16 July 1983	-17.6 °C25 December 1983	12.7 °C	1,512 mm	57	71
1982	35.2 °C19 July 1982	-21.0 °C17 January 1982	12.1 °C	986 mm	21	84
1981	34.7 °C9 July 1981	-21.9 °C12 January 1981	12.1 °C	982 mm	33	84
1980	37.5 °C16 July 1980	-15.8 °C25 December 1980	12.3 °C	831 mm	61	91
1979	34.5 °C10 August 1979	-22.4 °C18 February 1979	12.4 °C	1,285 mm	28	75
1978	35.7 °C22 July 1978	-17.6 °C5 February 1978	11.3 °C	1,334 mm	32	95
1977	36.7 °C19 July 1977	-20.1 °C17 January 1977	12.3 °C	1,204 mm	42	86
1976	33.2 °C18 April 1976	-15.6 °C23 January 1976	12.0 °C	958 mm	34	96
1975	35.5 °C2 August 1975	-10.5 °C8 February 1975	13.0 °C	1,318 mm	29	79
1974	35.1 °C9 July 1974	-11.1 °C5 February 1974	12.8 °C	970 mm	37	79
1973	36.1 °C28 August 1973	-13.8 °C17 February 1973	13.2 °C	1,260 mm	41	61
1972	35.5 °C23 July 1972	-15.0 °C16 January 1972	12.1 °C	1,412 mm	31	87
1971	36.1 °C8 July 1971	-14.1 °C19 January 1971	12.8 °C	1,309 mm	36	73
1970	34.5 °C23 September 1970	-18.2 °C23 January 1970	12.4 °C	987 mm	46	85
1969	36.4 °C17 July 1969	-11.2 °C28 January 1969	12.2 °C	1,198 mm	35	98
1968	38.2 °C1 July 1968	-19.2 °C2 January 1968	12.3 °C	923 mm	44	87
1967	34.2 °C16 June 1967	-20.4 °C13 February 1967	11.6 °C	1,062 mm	25	89
1966	40.9 °C3 July 1966	-16.1 °C29 January 1966	12.0 °C	914 mm	49	90
1965	34.9 °C25 July 1965	-17.2 °C15 January 1965	11.9 °C	707 mm	38	89
1964	36.7 °C30 June 1964	-16.6 °C15 January 1964	12.3 °C	974 mm	51	87
1963	36.5 °C27 June 1963	-20.3 °C29 January 1963	11.7 °C	944 mm	32	90
1962	35.2 °C19 May 1962	-18.3 °C11 February 1962	11.6 °C	948 mm	31	99
1961	34.1 °C13 June 1961	-22.6 °C22 January 1961	12.1 °C	1,135 mm	45	83
1960	33.0 °C30 August 1960	-18.4 °C23 December 1960	11.9 °C	1,119 mm	23	104
1959	37.8 °C29 June 1959	-13.5 °C23 December 1959	13.2 °C	990 mm	64	86
1958	34.0 °C2 July 1958	-15.4 °C17 February 1958	11.6 °C	1,277 mm	33	83
1957	37.7 °C22 July 1957	-17.3 °C18 January 1957	12.9 °C	938 mm	53	70
1956	36.8 °C2 July 1956	-10.1 °C28 January 1956	12.3 °C	1,128 mm	34	69
1955	37.8 °C22 July 1955	-17.3 °C3 February 1955	12.8 °C	928 mm	51	92
1954	37.9 °C31 July 1954	-19.6 °C18 January 1954	12.8 °C	969 mm	34	80
1953	38.5 °C2 September 1953	-9.2 °C18 December 1953	13.5 °C	1,050 mm	50	64
1952	38.2 °C26 June 1952	-16.9 °C30 January 1952	12.9 °C	1,308 mm	42	65
1951	34.2 °C27 July 1951	-18.0 °C17 December 1951	12.7 °C	1,089 mm	41	72
1950	33.8 °C26 June 1950	-13.2 °C27 December 1950	12.2 °C	1,038 mm	31	89
1949	37.5 °C5 July 1949	-11.9 °C20 March 1949	13.7 °C	835 mm	47	65
1948	37.1 °C26 August 1948	-20.5 °C19 January 1948	11.9 °C	1,243 mm	28	85
1947	34.2 °C14 August 1947	-13.9 °C5 February 1947	12.2 °C	1,012 mm	24	94
1946	32.5 °C19 July 1946	-14.3 °C23 January 1946	13.0 °C	969 mm	19	67
1945	35.7 °C1 July 1945	-18.0 °C25 January 1945	12.2 °C	1,356 mm	24	80
1944	35.4 °C5 August 1944	-10.5 °C9 January 1944	12.3 °C	1,161 mm	44	94
1943	34.8 °C25 June 1943	-18.7 °C16 February 1943	11.9 °C	899 mm	48	96
1942	35.1 °C19 July 1942	-18.0 °C11 January 1942	12.2 °C	1,217 mm	27	85
1941	35.9 °C28 July 1941	-10.5 °C30 January 1941	12.4 °C	967 mm	40	94
1940	35.1 °C26 July 1940	-15.4 °C20 January 1940	11.3 °C	1,206 mm	19	90

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

18.1 °C

+0.7 °C

Hot days (≥ 30 °C)

49 d/yr

Frost days (< 0 °C)

83 d/yr

Annual rainfall

954 mm

-141 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.7 °C	-1.4 °C	31 mm	-51 mm
Feb	6.1 °C	+0.3 °C	67 mm	-11 mm
Mar	15.3 °C	+4.5 °C	95 mm	-6 mm
Apr	18.8 °C	+1.7 °C	91 mm	-5 mm
May	22.6 °C	0.0 °C	137 mm	+40 mm
Jun	28.6 °C	+1.2 °C	62 mm	-27 mm
Jul	31.5 °C	+1.7 °C	179 mm	+77 mm
Aug	27.8 °C	-0.9 °C	21 mm	-78 mm
Sep	26.3 °C	+1.3 °C	85 mm	-5 mm
Oct	19.4 °C	+0.6 °C	73 mm	-9 mm
Nov	12.5 °C	0.0 °C	49 mm	-37 mm
Dec	4.4 °C	-2.0 °C	65 mm	-28 mm

The year's extremes

Hottest day

38.7 °C

24 Jun 2025

Coldest day

-13.0 °C

22 Jan 2025

Wettest day

54.4 mm

31 Jul 2025

Windiest day

36.3 km/h

16 Feb 2025

Strongest gust

85.3 km/h

16 Feb 2025

Hottest feels-like

42.9 °C

23 Jun 2025

Coldest feels-like

-18.1 °C

22 Jan 2025

Snowiest day

8.5 cm

14 Dec 2025

Sunniest day

14.0 h

5 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 Radnor?

Radnor has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,095 mm of precipitation per year.

What is the hottest day ever recorded in Radnor?

The hottest day measured in Radnor between 1940 and 2025 was 22 July 2011, reaching 41.0 °C.

What is the coldest day in Radnor?

The coldest day measured in Radnor between 1940 and 2025 was 22 January 1984, at -25.5 °C.

Does it snow in Radnor?

Yes. Radnor gets on average 52.1 cm of snow per year and has around 79 frost days.

Has the climate of Radnor warmed?

Yes: Radnor warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Radnor?

The wettest day measured in Radnor between 1940 and 2025 was 16 September 1999, with 147 mm of rain in 24 hours.

What was the windiest day in Radnor?

The windiest day measured in Radnor between 1940 and 2025 was 15 October 1954, with winds reaching 53.8 km/h.

What is the warmest month in Radnor?

The warmest month in Radnor is July (24.9 °C on average); the coldest is January (0.3 °C).

How much does it rain in Radnor?

Radnor receives on average 1,095 mm of precipitation per year, spread over about 116 rainy days.

Is it sunny in Radnor?

Radnor gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

What is the biggest single-day snowfall in Radnor?

The heaviest 24-hour snowfall measured in Radnor between 1940 and 2025 was 20 March 1958, with 36.9 cm.

Are there tropical nights in Radnor?

Yes: Radnor has on average 49 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Radnor?

In Radnor, between 1940 and 2025, the highest apparent temperature reached 45.7 °C on 15 July 1995, and the lowest was -30.5 °C on 22 January 1984.

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