Mason climate — normals and trends

Q: What is the climate of Mason?

Mason has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,056 mm of precipitation per year.

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

The hottest day measured in Mason between 1940 and 2025 was 14 July 1954, reaching 39.7 °C.

Q: What is the coldest day in Mason?

The coldest day measured in Mason between 1940 and 2025 was 19 January 1994, at -31.1 °C.

Q: Does it snow in Mason?

Yes. Mason gets on average 46.1 cm of snow per year and has around 90 frost days.

Q: Has the climate of Mason warmed?

Yes: Mason warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Mason?

The wettest day measured in Mason between 1940 and 2025 was 9 March 1964, with 94 mm of rain in 24 hours.

Q: What was the windiest day in Mason?

The windiest day measured in Mason between 1940 and 2025 was 27 September 2024, with winds reaching 46.9 km/h.

Q: What is the warmest month in Mason?

The warmest month in Mason is July (24.3 °C on average); the coldest is January (-0.9 °C).

Q: How much does it rain in Mason?

Mason receives on average 1,056 mm of precipitation per year, spread over about 127 rainy days.

Q: Is it sunny in Mason?

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

Mason (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.3 °C and it receives 1,056 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 (24.3 °C on average) and the coldest is January (-0.9 °C). Rainfall peaks in March.

Mason averages 90 frost days, 38 hot days (≥ 30 °C) and 127 rainy days per year.

Mason has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.

The number of frost days there went from about 102 to 78 per year over the period.

The hottest day of the period reached 39.7 °C (on 14 July 1954) and the coldest -31.1 °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

MasonOhio

coords: 39.36°, -84.31°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthJulyColdest monthJanuaryWettest monthMarchDriest monthSeptember

Mean daily temperature

12.3°C

Average daily high

17.2°C

Average daily low

7.7°C

Annual rainfall

1,056mm

Sunshine / day

8.7h

Mean relative humidity

69%

Average peak wind

16.5km/h

Seasonal range

25.2°C

Frost days (< 0 °C)

90 d/yr

Hot days (≥ 30 °C)

38 d/yr

Rainy days (≥ 1 mm)

127 d/yr

Annual snowfall

46.1 cm

Average feels-like high

15.8 °C

Average feels-like low

5.5 °C

Average peak gust

36.3 km/h

Tropical nights (≥ 20 °C)

43 d/yr

Solar radiation

14.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.6 °C

since 1940

+0.2 °C per decade · r² = 0.32 · 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

39.7 °C

14 July 1954

Coldest day

-31.1 °C

19 January 1994

Wettest day

94 mm

9 March 1964

Windiest day

46.9 km/h

27 September 2024

Strongest gust

104.8 km/h

30 January 2013

Hottest feels-like

42.8 °C

30 July 1999

Coldest feels-like

-36.6 °C

19 January 1994

Snowiest day

28.5 cm

22 March 1968

Sunniest day

14.8 h

18 June 1952

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.9 °C23 June 2025	-22.2 °C15 December 2025	12.9 °C	1,169 mm	45	85
2024	35.1 °C30 August 2024	-16.2 °C21 January 2024	14.1 °C	1,113 mm	51	56
2023	33.8 °C3 June 2023	-8.6 °C4 February 2023	14.0 °C	926 mm	37	60
2022	35.9 °C22 June 2022	-22.1 °C23 December 2022	13.1 °C	1,035 mm	46	87
2021	33.6 °C24 August 2021	-16.6 °C17 February 2021	13.5 °C	1,174 mm	39	80
2020	33.3 °C5 July 2020	-9.7 °C20 January 2020	13.4 °C	1,228 mm	43	63
2019	34.5 °C13 September 2019	-21.1 °C21 January 2019	13.3 °C	1,344 mm	59	82
2018	34.2 °C17 June 2018	-24.1 °C2 January 2018	13.1 °C	1,446 mm	53	85
2017	32.4 °C23 September 2017	-17.3 °C6 January 2017	13.7 °C	1,181 mm	31	69
2016	33.3 °C24 July 2016	-18.4 °C13 January 2016	13.7 °C	1,002 mm	55	84
2015	32.8 °C14 June 2015	-28.3 °C20 February 2015	12.8 °C	1,233 mm	31	78
2014	32.4 °C17 June 2014	-25.0 °C22 January 2014	11.4 °C	1,004 mm	21	96
2013	33.4 °C28 August 2013	-17.0 °C12 December 2013	12.3 °C	1,051 mm	26	101
2012	39.0 °C7 July 2012	-10.2 °C20 January 2012	14.2 °C	795 mm	61	71
2011	37.2 °C21 July 2011	-23.3 °C22 January 2011	13.2 °C	1,517 mm	58	80
2010	34.7 °C4 August 2010	-16.1 °C15 December 2010	12.8 °C	805 mm	63	92
2009	32.6 °C19 June 2009	-22.3 °C16 January 2009	12.2 °C	1,026 mm	21	81
2008	34.1 °C2 September 2008	-19.3 °C21 February 2008	12.2 °C	1,163 mm	37	100
2007	36.2 °C23 August 2007	-21.1 °C16 February 2007	13.4 °C	940 mm	70	86
2006	33.8 °C2 August 2006	-14.7 °C19 February 2006	13.1 °C	1,052 mm	32	71
2005	34.7 °C12 August 2005	-20.8 °C24 January 2005	12.8 °C	935 mm	46	86
2004	32.5 °C22 July 2004	-25.4 °C31 January 2004	12.4 °C	1,223 mm	15	87
2003	32.9 °C21 August 2003	-25.2 °C27 January 2003	11.8 °C	1,116 mm	21	97
2002	35.6 °C2 August 2002	-14.1 °C4 March 2002	13.1 °C	1,169 mm	64	92
2001	33.4 °C8 August 2001	-18.2 °C3 January 2001	13.0 °C	1,034 mm	31	73
2000	32.3 °C9 August 2000	-19.8 °C21 January 2000	12.1 °C	1,123 mm	19	90
1999	37.2 °C30 July 1999	-23.5 °C10 January 1999	13.0 °C	906 mm	48	83
1998	35.0 °C6 September 1998	-12.0 °C23 December 1998	13.8 °C	1,043 mm	37	67
1997	35.1 °C27 July 1997	-18.2 °C17 January 1997	11.6 °C	1,130 mm	22	88
1996	33.4 °C30 June 1996	-19.3 °C4 February 1996	11.5 °C	1,467 mm	33	102
1995	34.8 °C14 July 1995	-23.4 °C12 February 1995	12.1 °C	1,144 mm	46	100
1994	35.2 °C17 June 1994	-31.1 °C19 January 1994	12.5 °C	947 mm	39	80
1993	35.3 °C28 July 1993	-20.7 °C19 February 1993	11.9 °C	1,155 mm	43	94
1992	33.1 °C13 July 1992	-19.3 °C16 January 1992	11.9 °C	933 mm	12	74
1991	36.7 °C2 August 1991	-15.2 °C16 February 1991	13.4 °C	858 mm	56	87
1990	34.6 °C6 September 1990	-11.9 °C24 December 1990	13.4 °C	1,314 mm	31	67
1989	34.9 °C10 July 1989	-29.8 °C22 December 1989	11.6 °C	1,133 mm	29	98
1988	38.4 °C9 July 1988	-18.0 °C13 February 1988	12.1 °C	967 mm	56	100
1987	35.6 °C2 August 1987	-15.2 °C24 January 1987	13.1 °C	786 mm	58	83
1986	34.9 °C25 July 1986	-17.4 °C13 February 1986	12.9 °C	928 mm	50	81
1985	34.0 °C8 September 1985	-28.5 °C20 January 1985	12.1 °C	1,186 mm	24	90
1984	34.5 °C10 July 1984	-25.1 °C21 January 1984	12.2 °C	1,176 mm	43	83
1983	38.2 °C20 August 1983	-23.2 °C24 December 1983	12.5 °C	1,172 mm	71	84
1982	32.6 °C7 July 1982	-26.6 °C17 January 1982	12.2 °C	1,024 mm	18	94
1981	33.3 °C8 July 1981	-22.3 °C20 December 1981	11.8 °C	1,054 mm	29	98
1980	37.5 °C15 July 1980	-23.5 °C3 March 1980	11.7 °C	1,023 mm	54	101
1979	32.6 °C8 August 1979	-23.2 °C15 January 1979	11.2 °C	1,307 mm	14	101
1978	36.4 °C27 June 1978	-20.8 °C11 January 1978	11.0 °C	1,130 mm	37	92
1977	34.5 °C19 July 1977	-29.6 °C17 January 1977	12.0 °C	1,198 mm	45	91
1976	33.5 °C23 July 1976	-21.1 °C9 January 1976	11.3 °C	902 mm	21	110
1975	33.4 °C31 July 1975	-18.1 °C10 February 1975	12.6 °C	1,091 mm	43	92
1974	33.5 °C14 July 1974	-16.3 °C2 January 1974	12.2 °C	1,153 mm	25	78
1973	34.4 °C2 September 1973	-17.4 °C22 December 1973	13.0 °C	1,256 mm	41	81
1972	33.5 °C23 July 1972	-23.8 °C16 January 1972	11.4 °C	1,076 mm	21	94
1971	34.6 °C27 June 1971	-19.6 °C2 February 1971	12.4 °C	806 mm	31	91
1970	34.7 °C30 June 1970	-26.5 °C22 January 1970	12.1 °C	997 mm	39	89
1969	35.0 °C5 July 1969	-16.4 °C4 January 1969	11.5 °C	920 mm	30	106
1968	33.9 °C24 August 1968	-22.8 °C8 January 1968	11.6 °C	1,037 mm	35	93
1967	32.7 °C25 July 1967	-18.8 °C25 February 1967	11.6 °C	1,006 mm	20	92
1966	35.9 °C10 July 1966	-22.0 °C30 January 1966	11.5 °C	953 mm	50	97
1965	35.2 °C24 July 1965	-22.2 °C17 January 1965	12.1 °C	1,039 mm	26	99
1964	36.1 °C3 August 1964	-20.8 °C14 January 1964	12.4 °C	990 mm	49	97
1963	34.1 °C3 August 1963	-27.0 °C28 January 1963	11.0 °C	786 mm	24	100
1962	36.9 °C20 August 1962	-21.6 °C10 January 1962	11.8 °C	876 mm	46	105
1961	33.1 °C1 July 1961	-23.2 °C25 January 1961	11.7 °C	1,059 mm	33	96
1960	33.5 °C8 September 1960	-22.0 °C23 December 1960	11.3 °C	930 mm	34	115
1959	34.9 °C14 August 1959	-21.2 °C5 January 1959	12.8 °C	963 mm	67	100
1958	32.4 °C4 July 1958	-24.7 °C10 December 1958	10.9 °C	1,058 mm	23	106
1957	33.8 °C22 July 1957	-22.1 °C17 January 1957	12.5 °C	1,171 mm	37	85
1956	34.9 °C5 August 1956	-14.9 °C26 January 1956	12.3 °C	1,095 mm	28	87
1955	34.4 °C20 August 1955	-18.8 °C29 January 1955	12.6 °C	944 mm	58	98
1954	39.7 °C14 July 1954	-14.6 °C13 January 1954	13.0 °C	776 mm	58	83
1953	37.3 °C2 September 1953	-19.3 °C18 December 1953	13.2 °C	765 mm	65	78
1952	36.5 °C29 June 1952	-14.2 °C30 January 1952	12.8 °C	921 mm	56	88
1951	35.8 °C31 August 1951	-25.1 °C2 February 1951	11.8 °C	1,232 mm	39	94
1950	33.2 °C26 June 1950	-16.3 °C25 November 1950	11.4 °C	1,394 mm	12	113
1949	34.6 °C4 July 1949	-15.5 °C30 January 1949	13.0 °C	1,153 mm	45	79
1948	35.7 °C27 August 1948	-22.4 °C28 January 1948	12.1 °C	1,226 mm	36	81
1947	34.3 °C6 August 1947	-17.3 °C5 February 1947	11.3 °C	877 mm	32	113
1946	33.2 °C19 July 1946	-14.0 °C27 January 1946	12.6 °C	1,096 mm	12	80
1945	33.4 °C31 August 1945	-20.8 °C2 February 1945	11.6 °C	1,112 mm	31	97
1944	35.7 °C11 July 1944	-14.1 °C13 February 1944	12.1 °C	790 mm	44	105
1943	35.6 °C1 September 1943	-22.5 °C8 March 1943	11.0 °C	757 mm	34	117
1942	35.6 °C2 August 1942	-24.2 °C8 January 1942	11.4 °C	1,033 mm	20	106
1941	34.2 °C30 July 1941	-15.3 °C18 March 1941	11.6 °C	846 mm	25	108
1940	35.3 °C29 July 1940	-25.3 °C27 January 1940	10.4 °C	967 mm	33	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

17.9 °C

+0.7 °C

Hot days (≥ 30 °C)

45 d/yr

Frost days (< 0 °C)

85 d/yr

-5

Annual rainfall

1169 mm

+113 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	0.6 °C	-2.6 °C	61 mm	-23 mm
Feb	6.1 °C	+0.6 °C	134 mm	+51 mm
Mar	15.9 °C	+4.8 °C	123 mm	+15 mm
Apr	19.2 °C	+1.6 °C	148 mm	+41 mm
May	21.5 °C	-1.3 °C	119 mm	+11 mm
Jun	29.0 °C	+1.5 °C	124 mm	+31 mm
Jul	30.6 °C	+1.4 °C	147 mm	+59 mm
Aug	27.7 °C	-0.9 °C	37 mm	-34 mm
Sep	27.4 °C	+2.2 °C	59 mm	-9 mm
Oct	19.7 °C	+0.9 °C	87 mm	+18 mm
Nov	11.2 °C	-0.2 °C	61 mm	-27 mm
Dec	5.7 °C	+0.3 °C	69 mm	-19 mm

The year's extremes

Hottest day

34.9 °C

23 Jun 2025

Coldest day

-22.2 °C

15 Dec 2025

Wettest day

43.8 mm

16 Feb 2025

Windiest day

36.1 km/h

15 Apr 2025

Strongest gust

96.5 km/h

16 Mar 2025

Hottest feels-like

39.3 °C

26 Jul 2025

Coldest feels-like

-27.3 °C

15 Dec 2025

Snowiest day

9.8 cm

6 Jan 2025

Sunniest day

14.7 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 Mason?

Mason has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 1,056 mm of precipitation per year.

What is the hottest day ever recorded in Mason?

The hottest day measured in Mason between 1940 and 2025 was 14 July 1954, reaching 39.7 °C.

What is the coldest day in Mason?

The coldest day measured in Mason between 1940 and 2025 was 19 January 1994, at -31.1 °C.

Does it snow in Mason?

Yes. Mason gets on average 46.1 cm of snow per year and has around 90 frost days.

Has the climate of Mason warmed?

Yes: Mason warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Mason?

The wettest day measured in Mason between 1940 and 2025 was 9 March 1964, with 94 mm of rain in 24 hours.

What was the windiest day in Mason?

The windiest day measured in Mason between 1940 and 2025 was 27 September 2024, with winds reaching 46.9 km/h.

What is the warmest month in Mason?

The warmest month in Mason is July (24.3 °C on average); the coldest is January (-0.9 °C).

How much does it rain in Mason?

Mason receives on average 1,056 mm of precipitation per year, spread over about 127 rainy days.

Is it sunny in Mason?

Mason 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 Mason?

The heaviest 24-hour snowfall measured in Mason between 1940 and 2025 was 22 March 1968, with 28.5 cm.

Are there tropical nights in Mason?

Yes: Mason has on average 43 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Mason?

In Mason, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 30 July 1999, and the lowest was -36.6 °C on 19 January 1994.

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