Saint Charles climate — normals and trends

Q: What is the climate of Saint Charles?

Saint Charles has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,010 mm of precipitation per year.

Q: What is the hottest day ever recorded in Saint Charles?

The hottest day measured in Saint Charles between 1940 and 2025 was 8 July 2012, reaching 39.1 °C.

Q: What is the coldest day in Saint Charles?

The coldest day measured in Saint Charles between 1940 and 2025 was 19 January 1994, at -19.5 °C.

Q: Does it snow in Saint Charles?

Yes. Saint Charles gets on average 35.6 cm of snow per year and has around 53 frost days.

Q: Has the climate of Saint Charles warmed?

Yes: Saint Charles warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Saint Charles?

The wettest day measured in Saint Charles between 1940 and 2025 was 16 September 1999, with 142 mm of rain in 24 hours.

Q: What was the windiest day in Saint Charles?

The windiest day measured in Saint Charles between 1940 and 2025 was 15 October 1954, with winds reaching 49.0 km/h.

Q: What is the warmest month in Saint Charles?

The warmest month in Saint Charles is July (25.9 °C on average); the coldest is January (2.1 °C).

Q: How much does it rain in Saint Charles?

Saint Charles receives on average 1,010 mm of precipitation per year, spread over about 114 rainy days.

Q: Is it sunny in Saint Charles?

Saint Charles gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.

Saint Charles (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.2 °C and it receives 1,010 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 (25.9 °C on average) and the coldest is January (2.1 °C). Rainfall peaks in July.

Saint Charles averages 53 frost days, 44 hot days (≥ 30 °C) and 114 rainy days per year.

Saint Charles has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The number of frost days there went from about 61 to 45 per year over the period.

The hottest day of the period reached 39.1 °C (on 8 July 2012) and the coldest -19.5 °C (on 19 January 1994).

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

Saint CharlesMaryland

coords: 38.60°, -76.94°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

14.2°C

Average daily high

18.5°C

Average daily low

10.5°C

Annual rainfall

1,010mm

Sunshine / day

9.2h

Mean relative humidity

70%

Average peak wind

15.2km/h

Seasonal range

23.8°C

Frost days (< 0 °C)

53 d/yr

Hot days (≥ 30 °C)

44 d/yr

Rainy days (≥ 1 mm)

114 d/yr

Annual snowfall

35.6 cm

Average feels-like high

17.8 °C

Average feels-like low

8.9 °C

Average peak gust

33.9 km/h

Tropical nights (≥ 20 °C)

77 d/yr

Solar radiation

15.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.4 °C

since 1940

+0.2 °C per decade · r² = 0.34 · 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

8 July 2012

Coldest day

-19.5 °C

19 January 1994

Wettest day

142 mm

16 September 1999

Windiest day

49.0 km/h

15 October 1954

Strongest gust

121.0 km/h

18 September 2003

Hottest feels-like

43.9 °C

27 June 1952

Coldest feels-like

-26.1 °C

19 January 1994

Snowiest day

33.3 cm

19 December 2009

Sunniest day

14.2 h

4 July 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.5 °C24 June 2025	-12.9 °C23 January 2025	14.6 °C	1,084 mm	43	58
2024	37.5 °C16 July 2024	-7.2 °C17 January 2024	15.5 °C	1,009 mm	51	38
2023	37.2 °C29 July 2023	-7.5 °C4 February 2023	15.8 °C	946 mm	50	17
2022	35.8 °C17 June 2022	-11.6 °C24 December 2022	14.9 °C	1,194 mm	54	60
2021	35.6 °C11 August 2021	-4.4 °C30 January 2021	15.5 °C	936 mm	58	34
2020	36.7 °C21 July 2020	-5.3 °C15 February 2020	15.7 °C	1,491 mm	56	23
2019	37.7 °C20 July 2019	-12.2 °C31 January 2019	15.6 °C	964 mm	77	43
2018	35.1 °C3 July 2018	-14.2 °C7 January 2018	15.0 °C	1,468 mm	57	44
2017	35.8 °C20 July 2017	-9.0 °C28 December 2017	15.5 °C	978 mm	54	39
2016	36.2 °C25 July 2016	-10.8 °C14 February 2016	15.1 °C	1,122 mm	56	45
2015	36.0 °C23 June 2015	-15.7 °C20 February 2015	14.8 °C	949 mm	52	56
2014	35.6 °C18 June 2014	-13.3 °C30 January 2014	13.8 °C	910 mm	34	66
2013	34.3 °C19 July 2013	-8.1 °C23 January 2013	14.3 °C	1,162 mm	43	48
2012	39.1 °C8 July 2012	-7.6 °C4 January 2012	15.7 °C	859 mm	51	18
2011	37.8 °C9 June 2011	-10.4 °C24 January 2011	15.2 °C	1,251 mm	52	47
2010	38.4 °C6 July 2010	-9.5 °C31 January 2010	15.0 °C	941 mm	83	68
2009	35.2 °C10 August 2009	-14.0 °C17 January 2009	14.2 °C	1,200 mm	36	62
2008	37.9 °C10 June 2008	-7.7 °C21 January 2008	14.7 °C	960 mm	45	45
2007	37.4 °C8 August 2007	-12.2 °C6 February 2007	14.9 °C	748 mm	59	49
2006	35.6 °C3 August 2006	-9.3 °C19 February 2006	15.1 °C	1,086 mm	45	26
2005	37.2 °C27 July 2005	-10.1 °C24 January 2005	14.4 °C	986 mm	49	59
2004	33.0 °C5 July 2004	-11.3 °C10 January 2004	14.3 °C	1,088 mm	31	58
2003	33.5 °C5 July 2003	-11.9 °C28 January 2003	13.6 °C	1,341 mm	29	65
2002	35.9 °C13 August 2002	-9.2 °C7 December 2002	15.0 °C	883 mm	59	45
2001	34.7 °C10 August 2001	-6.1 °C3 January 2001	14.7 °C	867 mm	22	47
2000	33.1 °C13 May 2000	-10.3 °C29 January 2000	13.9 °C	909 mm	24	60
1999	37.3 °C1 August 1999	-7.9 °C6 January 1999	14.8 °C	994 mm	50	40
1998	36.0 °C26 June 1998	-5.7 °C1 January 1998	15.6 °C	935 mm	53	19
1997	35.4 °C15 July 1997	-14.0 °C19 January 1997	13.9 °C	954 mm	35	39
1996	33.7 °C7 July 1996	-16.7 °C5 February 1996	13.5 °C	1,292 mm	23	61
1995	36.4 °C5 August 1995	-12.6 °C6 February 1995	14.5 °C	937 mm	57	53
1994	36.3 °C15 June 1994	-19.5 °C19 January 1994	14.5 °C	1,063 mm	48	49
1993	37.1 °C9 July 1993	-9.9 °C19 February 1993	14.3 °C	1,033 mm	61	51
1992	36.9 °C14 July 1992	-8.1 °C19 January 1992	13.5 °C	965 mm	25	52
1991	36.7 °C23 July 1991	-7.4 °C16 February 1991	15.2 °C	938 mm	58	44
1990	36.5 °C5 July 1990	-8.8 °C26 February 1990	15.3 °C	1,039 mm	40	27
1989	35.7 °C11 July 1989	-14.9 °C22 December 1989	13.7 °C	1,296 mm	37	69
1988	37.9 °C16 July 1988	-14.0 °C12 January 1988	13.7 °C	874 mm	60	59
1987	38.0 °C21 July 1987	-12.7 °C27 January 1987	14.2 °C	945 mm	57	53
1986	36.8 °C18 July 1986	-9.8 °C28 January 1986	14.3 °C	803 mm	63	57
1985	35.8 °C15 August 1985	-18.8 °C21 January 1985	14.5 °C	932 mm	44	66
1984	34.2 °C7 June 1984	-14.8 °C20 January 1984	13.9 °C	1,099 mm	38	60
1983	38.1 °C20 August 1983	-16.0 °C25 December 1983	14.1 °C	1,213 mm	59	48
1982	33.9 °C19 July 1982	-19.4 °C17 January 1982	13.8 °C	1,042 mm	28	57
1981	36.4 °C25 June 1981	-14.4 °C13 January 1981	13.5 °C	737 mm	29	67
1980	36.7 °C20 July 1980	-12.4 °C26 December 1980	13.9 °C	793 mm	63	60
1979	33.8 °C10 August 1979	-17.9 °C18 February 1979	13.7 °C	1,226 mm	22	63
1978	36.5 °C23 July 1978	-10.6 °C10 January 1978	13.6 °C	1,062 mm	51	77
1977	35.6 °C17 July 1977	-18.5 °C17 January 1977	14.2 °C	854 mm	56	73
1976	33.8 °C24 July 1976	-12.6 °C19 January 1976	13.7 °C	913 mm	40	68
1975	35.0 °C4 August 1975	-7.7 °C19 December 1975	14.4 °C	1,195 mm	34	47
1974	34.5 °C15 July 1974	-6.0 °C5 February 1974	14.3 °C	983 mm	31	42
1973	34.8 °C29 August 1973	-11.4 °C17 February 1973	14.5 °C	1,001 mm	42	48
1972	34.4 °C21 July 1972	-14.9 °C16 January 1972	13.5 °C	1,192 mm	25	54
1971	33.2 °C8 July 1971	-12.0 °C2 February 1971	14.1 °C	1,154 mm	30	59
1970	35.9 °C4 July 1970	-16.6 °C9 January 1970	13.8 °C	784 mm	55	70
1969	36.0 °C18 July 1969	-10.8 °C5 January 1969	13.3 °C	1,034 mm	38	75
1968	36.7 °C25 August 1968	-15.4 °C12 January 1968	13.5 °C	914 mm	42	75
1967	34.7 °C25 June 1967	-10.9 °C25 February 1967	13.0 °C	934 mm	27	68
1966	35.9 °C3 July 1966	-13.1 °C29 January 1966	13.2 °C	866 mm	56	64
1965	35.6 °C19 August 1965	-11.3 °C17 January 1965	13.4 °C	671 mm	45	68
1964	36.3 °C10 June 1964	-15.9 °C15 January 1964	13.7 °C	959 mm	44	63
1963	34.4 °C19 July 1963	-13.7 °C29 January 1963	13.1 °C	856 mm	37	73
1962	36.0 °C20 August 1962	-12.4 °C11 January 1962	13.2 °C	1,036 mm	42	67
1961	33.8 °C23 July 1961	-15.6 °C26 January 1961	13.6 °C	1,062 mm	56	55
1960	34.4 °C3 July 1960	-15.9 °C23 December 1960	13.4 °C	998 mm	42	75
1959	37.6 °C29 June 1959	-10.9 °C6 January 1959	14.6 °C	949 mm	53	55
1958	33.6 °C3 July 1958	-14.3 °C17 February 1958	12.9 °C	1,185 mm	37	62
1957	36.5 °C22 July 1957	-15.4 °C18 January 1957	14.4 °C	1,073 mm	59	41
1956	35.3 °C2 July 1956	-6.6 °C28 January 1956	13.9 °C	1,030 mm	40	44
1955	35.1 °C2 August 1955	-11.1 °C28 January 1955	14.0 °C	985 mm	35	72
1954	37.8 °C14 July 1954	-10.2 °C13 January 1954	14.3 °C	803 mm	50	50
1953	38.3 °C31 August 1953	-6.7 °C18 December 1953	15.1 °C	956 mm	57	30
1952	37.5 °C26 June 1952	-8.0 °C30 January 1952	14.4 °C	1,198 mm	53	29
1951	34.7 °C23 July 1951	-9.9 °C3 February 1951	14.1 °C	976 mm	42	55
1950	34.0 °C24 June 1950	-9.2 °C27 December 1950	13.8 °C	955 mm	24	49
1949	35.4 °C29 July 1949	-4.7 °C16 December 1949	15.0 °C	889 mm	44	36
1948	35.9 °C28 August 1948	-13.5 °C31 January 1948	13.7 °C	1,201 mm	36	58
1947	34.3 °C11 June 1947	-10.5 °C5 February 1947	13.6 °C	859 mm	24	68
1946	32.9 °C18 June 1946	-9.3 °C28 January 1946	14.5 °C	871 mm	21	39
1945	36.0 °C1 July 1945	-10.7 °C24 December 1945	14.0 °C	1,121 mm	21	60
1944	34.9 °C30 July 1944	-5.9 °C9 January 1944	14.0 °C	1,051 mm	45	55
1943	35.2 °C14 August 1943	-11.3 °C15 February 1943	13.8 °C	769 mm	64	59
1942	34.8 °C19 July 1942	-12.7 °C21 December 1942	14.1 °C	1,190 mm	29	55
1941	35.2 °C28 July 1941	-7.6 °C18 March 1941	14.2 °C	837 mm	44	64
1940	35.4 °C28 July 1940	-13.6 °C27 January 1940	13.0 °C	1,097 mm	19	58

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

18.8 °C

+0.3 °C

Hot days (≥ 30 °C)

43 d/yr

-1

Frost days (< 0 °C)

58 d/yr

Annual rainfall

1084 mm

+74 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	3.7 °C	-2.2 °C	59 mm	-18 mm
Feb	7.9 °C	+0.3 °C	110 mm	+36 mm
Mar	16.6 °C	+4.1 °C	62 mm	-31 mm
Apr	20.5 °C	+2.0 °C	83 mm	+1 mm
May	23.4 °C	0.0 °C	173 mm	+84 mm
Jun	29.2 °C	+1.2 °C	123 mm	+40 mm
Jul	30.8 °C	+0.7 °C	236 mm	+139 mm
Aug	26.9 °C	-2.1 °C	16 mm	-75 mm
Sep	25.6 °C	+0.1 °C	99 mm	+12 mm
Oct	19.6 °C	0.0 °C	43 mm	-33 mm
Nov	14.1 °C	+0.5 °C	32 mm	-48 mm
Dec	6.8 °C	-1.2 °C	47 mm	-34 mm

The year's extremes

Hottest day

35.5 °C

24 Jun 2025

Coldest day

-12.9 °C

23 Jan 2025

Wettest day

37.1 mm

13 May 2025

Windiest day

34.4 km/h

16 Feb 2025

Strongest gust

74.5 km/h

16 Feb 2025

Hottest feels-like

42.8 °C

25 Jun 2025

Coldest feels-like

-17.4 °C

23 Jan 2025

Snowiest day

16.9 cm

6 Jan 2025

Sunniest day

14.2 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 Saint Charles?

Saint Charles has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,010 mm of precipitation per year.

What is the hottest day ever recorded in Saint Charles?

The hottest day measured in Saint Charles between 1940 and 2025 was 8 July 2012, reaching 39.1 °C.

What is the coldest day in Saint Charles?

The coldest day measured in Saint Charles between 1940 and 2025 was 19 January 1994, at -19.5 °C.

Does it snow in Saint Charles?

Yes. Saint Charles gets on average 35.6 cm of snow per year and has around 53 frost days.

Has the climate of Saint Charles warmed?

Yes: Saint Charles warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Saint Charles?

The wettest day measured in Saint Charles between 1940 and 2025 was 16 September 1999, with 142 mm of rain in 24 hours.

What was the windiest day in Saint Charles?

The windiest day measured in Saint Charles between 1940 and 2025 was 15 October 1954, with winds reaching 49.0 km/h.

What is the warmest month in Saint Charles?

The warmest month in Saint Charles is July (25.9 °C on average); the coldest is January (2.1 °C).

How much does it rain in Saint Charles?

Saint Charles receives on average 1,010 mm of precipitation per year, spread over about 114 rainy days.

Is it sunny in Saint Charles?

Saint Charles gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.

What is the biggest single-day snowfall in Saint Charles?

The heaviest 24-hour snowfall measured in Saint Charles between 1940 and 2025 was 19 December 2009, with 33.3 cm.

Are there tropical nights in Saint Charles?

Yes: Saint Charles has on average 77 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Saint Charles?

In Saint Charles, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 27 June 1952, and the lowest was -26.1 °C on 19 January 1994.

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