St. Marys climate — normals and trends

Q: What is the climate of St. Marys?

St. Marys has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.3 °C and it receives 1,073 mm of precipitation per year.

Q: What is the hottest day ever recorded in St. Marys?

The hottest day measured in St. Marys between 1940 and 2025 was 24 June 1944, reaching 39.4 °C.

Q: What is the coldest day in St. Marys?

The coldest day measured in St. Marys between 1940 and 2025 was 21 January 1985, at -11.3 °C.

Q: Does it snow in St. Marys?

Almost never: St. Marys sees virtually no snow, with about 3 frost days per year.

Q: Has the climate of St. Marys warmed?

Yes: St. Marys warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in St. Marys?

The wettest day measured in St. Marys between 1940 and 2025 was 7 October 2016, with 168 mm of rain in 24 hours.

Q: What was the windiest day in St. Marys?

The windiest day measured in St. Marys between 1940 and 2025 was 11 September 2017, with winds reaching 72.4 km/h.

Q: What is the warmest month in St. Marys?

The warmest month in St. Marys is July (27.1 °C on average); the coldest is January (12.3 °C).

Q: How much does it rain in St. Marys?

St. Marys receives on average 1,073 mm of precipitation per year, spread over about 137 rainy days.

Q: Is it sunny in St. Marys?

St. Marys gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

St. Marys (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 20.3 °C and it receives 1,073 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 (27.1 °C on average) and the coldest is January (12.3 °C). Rainfall peaks in August.

St. Marys averages 3 frost days, 65 hot days (≥ 30 °C) and 137 rainy days per year.

St. Marys has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.

The hottest day of the period reached 39.4 °C (on 24 June 1944) and the coldest -11.3 °C (on 21 January 1985).

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

St. MarysGeorgia

coords: 30.73°, -81.55°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthAugustDriest monthNovember

Mean daily temperature

20.3°C

Average daily high

24.1°C

Average daily low

17.1°C

Annual rainfall

1,073mm

Sunshine / day

9.9h

Mean relative humidity

76%

Average peak wind

18.9km/h

Seasonal range

14.8°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

65 d/yr

Rainy days (≥ 1 mm)

137 d/yr

Annual snowfall

0.1 cm

Average feels-like high

25.5 °C

Average feels-like low

17.1 °C

Average peak gust

35.0 km/h

Tropical nights (≥ 20 °C)

157 d/yr

Solar radiation

17.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.8 °C

since 1940

+0.1 °C per decade · r² = 0.14 · 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

39.4 °C

24 June 1944

Coldest day

-11.3 °C

21 January 1985

Wettest day

168 mm

7 October 2016

Windiest day

72.4 km/h

11 September 2017

Strongest gust

152.3 km/h

11 September 2017

Hottest feels-like

44.1 °C

1 August 1999

Coldest feels-like

-19.0 °C

21 January 1985

Snowiest day

6.6 cm

23 December 1989

Sunniest day

13.3 h

26 June 1944

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.5 °C29 July 2025	-0.3 °C25 January 2025	20.7 °C	1,278 mm	81	2
2024	34.3 °C9 June 2024	-0.6 °C17 January 2024	21.2 °C	1,243 mm	87	2
2023	35.8 °C21 July 2023	1.9 °C15 January 2023	21.5 °C	1,093 mm	78	0
2022	36.4 °C23 June 2022	-3.6 °C24 December 2022	21.0 °C	1,028 mm	79	4
2021	33.8 °C31 July 2021	1.3 °C4 February 2021	20.8 °C	1,146 mm	57	0
2020	34.1 °C28 June 2020	-0.3 °C26 December 2020	21.6 °C	1,091 mm	76	1
2019	34.8 °C27 May 2019	1.7 °C30 January 2019	21.6 °C	1,179 mm	90	0
2018	34.1 °C14 September 2018	-2.6 °C18 January 2018	20.9 °C	1,126 mm	81	5
2017	32.9 °C28 May 2017	-0.3 °C8 January 2017	21.5 °C	1,180 mm	74	1
2016	36.0 °C8 July 2016	0.1 °C24 January 2016	21.4 °C	1,169 mm	92	0
2015	34.9 °C19 June 2015	-2.0 °C20 February 2015	21.3 °C	1,009 mm	71	3
2014	35.1 °C28 July 2014	-3.9 °C7 January 2014	20.1 °C	1,139 mm	70	1
2013	33.6 °C13 August 2013	0.6 °C17 February 2013	20.6 °C	1,002 mm	56	0
2012	33.5 °C30 June 2012	-1.6 °C12 February 2012	20.7 °C	1,203 mm	53	2
2011	34.7 °C20 June 2011	-1.9 °C13 January 2011	20.9 °C	847 mm	103	2
2010	35.4 °C30 July 2010	-3.2 °C14 December 2010	19.7 °C	745 mm	94	16
2009	35.5 °C21 June 2009	-3.1 °C5 February 2009	20.3 °C	1,017 mm	71	5
2008	33.5 °C6 August 2008	-0.9 °C3 January 2008	20.1 °C	982 mm	68	1
2007	34.6 °C10 August 2007	-0.1 °C17 February 2007	20.6 °C	938 mm	67	1
2006	34.8 °C11 August 2006	-0.1 °C13 February 2006	20.4 °C	793 mm	73	1
2005	34.0 °C27 July 2005	-2.2 °C24 January 2005	20.0 °C	1,213 mm	71	1
2004	34.6 °C31 May 2004	-1.2 °C20 December 2004	20.2 °C	1,122 mm	66	1
2003	33.9 °C9 July 2003	-4.9 °C24 January 2003	20.0 °C	1,010 mm	42	5
2002	35.8 °C3 June 2002	-1.8 °C28 February 2002	20.5 °C	1,097 mm	66	4
2001	33.6 °C9 July 2001	-2.1 °C4 January 2001	20.3 °C	868 mm	67	6
2000	36.1 °C20 July 2000	-3.7 °C20 December 2000	19.9 °C	795 mm	77	5
1999	37.9 °C2 August 1999	-2.2 °C6 January 1999	20.5 °C	810 mm	65	2
1998	36.6 °C30 June 1998	1.4 °C1 January 1998	21.2 °C	1,088 mm	81	0
1997	33.9 °C4 July 1997	-1.3 °C18 January 1997	20.4 °C	1,252 mm	69	3
1996	34.4 °C21 July 1996	-4.1 °C5 February 1996	19.7 °C	1,031 mm	57	8
1995	34.3 °C18 August 1995	-3.2 °C9 February 1995	20.3 °C	1,143 mm	65	3
1994	32.7 °C1 September 1994	-1.9 °C19 January 1994	20.6 °C	1,295 mm	52	2
1993	35.1 °C17 July 1993	-0.8 °C14 March 1993	20.2 °C	1,132 mm	83	1
1992	34.0 °C10 July 1992	-0.5 °C17 January 1992	19.9 °C	1,156 mm	55	1
1991	33.8 °C4 June 1991	-2.6 °C16 February 1991	20.8 °C	1,165 mm	71	1
1990	35.1 °C1 July 1990	2.9 °C13 January 1990	21.3 °C	704 mm	91	0
1989	34.3 °C6 August 1989	-6.0 °C24 December 1989	20.2 °C	1,048 mm	60	5
1988	33.6 °C15 July 1988	0.0 °C13 December 1988	19.5 °C	1,050 mm	65	0
1987	34.9 °C23 July 1987	0.3 °C27 January 1987	20.1 °C	1,035 mm	88	0
1986	37.1 °C20 July 1986	-6.1 °C28 January 1986	20.9 °C	992 mm	91	2
1985	35.6 °C2 June 1985	-11.3 °C21 January 1985	20.4 °C	1,088 mm	57	8
1984	33.6 °C15 August 1984	-0.6 °C7 December 1984	20.0 °C	1,087 mm	57	2
1983	35.3 °C22 July 1983	-8.0 °C25 December 1983	19.6 °C	1,402 mm	55	4
1982	34.5 °C10 June 1982	-6.1 °C11 January 1982	20.5 °C	1,204 mm	60	3
1981	36.2 °C15 July 1981	-4.7 °C13 January 1981	19.5 °C	714 mm	70	10
1980	36.7 °C13 July 1980	-3.6 °C3 March 1980	19.9 °C	948 mm	71	2
1979	33.4 °C5 July 1979	-3.5 °C3 January 1979	19.8 °C	1,309 mm	50	7
1978	34.3 °C2 July 1978	-1.9 °C7 February 1978	19.8 °C	997 mm	50	8
1977	34.5 °C8 July 1977	-4.5 °C19 January 1977	19.7 °C	873 mm	80	7
1976	34.5 °C16 July 1976	-2.2 °C18 January 1976	19.4 °C	998 mm	38	5
1975	33.5 °C6 June 1975	-1.2 °C19 December 1975	20.6 °C	951 mm	61	1
1974	32.8 °C23 June 1974	-2.0 °C26 February 1974	20.6 °C	985 mm	40	1
1973	33.1 °C5 July 1973	-1.7 °C22 December 1973	20.2 °C	1,243 mm	57	2
1972	34.1 °C29 July 1972	-0.2 °C5 February 1972	20.5 °C	1,111 mm	58	1
1971	34.6 °C15 June 1971	-3.9 °C20 January 1971	20.2 °C	1,245 mm	57	7
1970	35.0 °C19 June 1970	-6.2 °C9 January 1970	19.6 °C	1,071 mm	64	9
1969	33.4 °C11 July 1969	-0.3 °C15 November 1969	19.1 °C	1,440 mm	49	1
1968	34.4 °C28 July 1968	-1.7 °C16 December 1968	19.2 °C	971 mm	61	6
1967	32.2 °C15 May 1967	-3.6 °C26 February 1967	19.6 °C	830 mm	46	2
1966	33.2 °C5 July 1966	-6.1 °C30 January 1966	19.2 °C	1,064 mm	39	7
1965	32.6 °C4 July 1965	-2.3 °C18 January 1965	19.8 °C	968 mm	49	4
1964	35.2 °C16 June 1964	-3.9 °C14 January 1964	19.8 °C	1,467 mm	53	3
1963	34.9 °C14 June 1963	-4.0 °C24 January 1963	19.5 °C	1,000 mm	65	5
1962	33.6 °C26 May 1962	-7.1 °C13 December 1962	19.8 °C	909 mm	72	7
1961	33.6 °C31 July 1961	-3.5 °C22 January 1961	19.7 °C	837 mm	56	3
1960	33.5 °C3 July 1960	-2.7 °C23 January 1960	19.3 °C	1,168 mm	56	10
1959	34.2 °C29 June 1959	-4.1 °C17 January 1959	20.0 °C	1,469 mm	45	5
1958	33.7 °C14 June 1958	-5.8 °C18 February 1958	19.2 °C	937 mm	73	13
1957	33.8 °C12 August 1957	-3.8 °C12 December 1957	20.4 °C	1,307 mm	53	4
1956	33.6 °C6 August 1956	-0.8 °C9 January 1956	19.8 °C	870 mm	66	1
1955	33.3 °C22 August 1955	-3.0 °C12 February 1955	20.1 °C	865 mm	64	6
1954	36.2 °C6 August 1954	-0.9 °C21 December 1954	20.1 °C	671 mm	76	1
1953	35.0 °C4 August 1953	-0.7 °C18 December 1953	20.3 °C	1,314 mm	56	1
1952	36.1 °C24 July 1952	-0.8 °C16 December 1952	20.2 °C	1,002 mm	69	2
1951	33.9 °C8 August 1951	-2.5 °C2 February 1951	20.2 °C	857 mm	80	6
1950	36.1 °C26 June 1950	-4.8 °C25 November 1950	20.3 °C	1,187 mm	51	2
1949	34.1 °C28 July 1949	0.8 °C1 January 1949	21.0 °C	1,052 mm	67	0
1948	33.6 °C25 June 1948	-4.5 °C15 January 1948	20.9 °C	1,406 mm	62	2
1947	34.7 °C4 August 1947	-2.1 °C5 February 1947	20.3 °C	1,520 mm	42	2
1946	33.0 °C20 June 1946	2.9 °C2 January 1946	20.7 °C	1,349 mm	33	0
1945	36.3 °C1 June 1945	0.3 °C20 December 1945	21.1 °C	1,373 mm	68	0
1944	39.4 °C24 June 1944	2.5 °C15 December 1944	21.0 °C	1,294 mm	59	0
1943	34.8 °C5 June 1943	0.5 °C15 February 1943	20.6 °C	976 mm	58	0
1942	36.7 °C21 July 1942	0.5 °C11 January 1942	20.7 °C	838 mm	69	0
1941	37.0 °C11 June 1941	2.5 °C1 March 1941	20.6 °C	886 mm	79	0
1940	34.7 °C26 July 1940	-2.3 °C27 January 1940	20.0 °C	962 mm	43	6

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

24.7 °C

+0.6 °C

Hot days (≥ 30 °C)

81 d/yr

+16

Frost days (< 0 °C)

2 d/yr

-1

Annual rainfall

1278 mm

+205 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	14.2 °C	-2.3 °C	116 mm	+44 mm
Feb	19.9 °C	+2.1 °C	53 mm	-17 mm
Mar	21.3 °C	+0.7 °C	105 mm	+25 mm
Apr	25.6 °C	+1.6 °C	26 mm	-31 mm
May	29.4 °C	+1.9 °C	143 mm	+78 mm
Jun	30.2 °C	+0.4 °C	117 mm	0 mm
Jul	31.7 °C	+1.0 °C	83 mm	-45 mm
Aug	30.2 °C	0.0 °C	329 mm	+177 mm
Sep	28.4 °C	0.0 °C	88 mm	-55 mm
Oct	24.4 °C	-0.7 °C	155 mm	+74 mm
Nov	22.5 °C	+1.4 °C	1 mm	-49 mm
Dec	18.3 °C	+0.5 °C	64 mm	+4 mm

The year's extremes

Hottest day

35.5 °C

29 Jul 2025

Coldest day

-0.3 °C

25 Jan 2025

Wettest day

51.6 mm

3 Aug 2025

Windiest day

37.7 km/h

6 Jan 2025

Strongest gust

77.4 km/h

6 Jan 2025

Hottest feels-like

42.7 °C

29 Jul 2025

Coldest feels-like

-6.5 °C

22 Jan 2025

Snowiest day

0.8 cm

22 Jan 2025

Sunniest day

13.2 h

21 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 St. Marys?

St. Marys has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.3 °C and it receives 1,073 mm of precipitation per year.

What is the hottest day ever recorded in St. Marys?

The hottest day measured in St. Marys between 1940 and 2025 was 24 June 1944, reaching 39.4 °C.

What is the coldest day in St. Marys?

The coldest day measured in St. Marys between 1940 and 2025 was 21 January 1985, at -11.3 °C.

Does it snow in St. Marys?

Almost never: St. Marys sees virtually no snow, with about 3 frost days per year.

Has the climate of St. Marys warmed?

Yes: St. Marys warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in St. Marys?

The wettest day measured in St. Marys between 1940 and 2025 was 7 October 2016, with 168 mm of rain in 24 hours.

What was the windiest day in St. Marys?

The windiest day measured in St. Marys between 1940 and 2025 was 11 September 2017, with winds reaching 72.4 km/h.

What is the warmest month in St. Marys?

The warmest month in St. Marys is July (27.1 °C on average); the coldest is January (12.3 °C).

How much does it rain in St. Marys?

St. Marys receives on average 1,073 mm of precipitation per year, spread over about 137 rainy days.

Is it sunny in St. Marys?

St. Marys gets on average 9.9 hours of sunshine per day, roughly 3,614 hours per year over 1940-2025.

What is the biggest single-day snowfall in St. Marys?

The heaviest 24-hour snowfall measured in St. Marys between 1940 and 2025 was 23 December 1989, with 6.6 cm.

Are there tropical nights in St. Marys?

Yes: St. Marys has on average 157 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in St. Marys?

In St. Marys, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 1 August 1999, and the lowest was -19.0 °C on 21 January 1985.

Compare St. Marys with another city

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