Greater Upper Marlboro climate — normals and trends

Q: What is the climate of Greater Upper Marlboro?

Greater Upper Marlboro has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,061 mm of precipitation per year.

Q: What is the hottest day ever recorded in Greater Upper Marlboro?

The hottest day measured in Greater Upper Marlboro between 1940 and 2025 was 29 June 2012, reaching 40.6 °C.

Q: What is the coldest day in Greater Upper Marlboro?

The coldest day measured in Greater Upper Marlboro between 1940 and 2025 was 17 January 1982, at -20.3 °C.

Q: Does it snow in Greater Upper Marlboro?

Yes. Greater Upper Marlboro gets on average 37.7 cm of snow per year and has around 58 frost days.

Q: Has the climate of Greater Upper Marlboro warmed?

Yes: Greater Upper Marlboro warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Greater Upper Marlboro?

The wettest day measured in Greater Upper Marlboro between 1940 and 2025 was 16 September 1999, with 146 mm of rain in 24 hours.

Q: What was the windiest day in Greater Upper Marlboro?

The windiest day measured in Greater Upper Marlboro between 1940 and 2025 was 1 December 1974, with winds reaching 49.3 km/h.

Q: What is the warmest month in Greater Upper Marlboro?

The warmest month in Greater Upper Marlboro is July (25.7 °C on average); the coldest is January (1.9 °C).

Q: How much does it rain in Greater Upper Marlboro?

Greater Upper Marlboro receives on average 1,061 mm of precipitation per year, spread over about 117 rainy days.

Q: Is it sunny in Greater Upper Marlboro?

Greater Upper Marlboro gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.

Greater Upper Marlboro (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.0 °C and it receives 1,061 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 (25.7 °C on average) and the coldest is January (1.9 °C). Rainfall peaks in July.

Greater Upper Marlboro averages 58 frost days, 46 hot days (≥ 30 °C) and 117 rainy days per year.

Greater Upper Marlboro has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.

The number of frost days there went from about 66 to 50 per year over the period.

The hottest day of the period reached 40.6 °C (on 29 June 2012) and the coldest -20.3 °C (on 17 January 1982).

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

Greater Upper MarlboroMaryland

coords: 38.83°, -76.75°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJulyColdest monthJanuaryWettest monthJulyDriest monthFebruary

Mean daily temperature

14.0°C

Average daily high

18.4°C

Average daily low

10.1°C

Annual rainfall

1,061mm

Sunshine / day

9.1h

Mean relative humidity

69%

Average peak wind

16.2km/h

Seasonal range

23.8°C

Frost days (< 0 °C)

58 d/yr

Hot days (≥ 30 °C)

46 d/yr

Rainy days (≥ 1 mm)

117 d/yr

Annual snowfall

37.7 cm

Average feels-like high

17.7 °C

Average feels-like low

8.1 °C

Average peak gust

36.8 km/h

Tropical nights (≥ 20 °C)

71 d/yr

Solar radiation

15.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.5 °C

since 1940

+0.2 °C per decade · r² = 0.37 · 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

40.6 °C

29 June 2012

Coldest day

-20.3 °C

17 January 1982

Wettest day

146 mm

16 September 1999

Windiest day

49.3 km/h

1 December 1974

Strongest gust

121.0 km/h

18 September 2003

Hottest feels-like

45.4 °C

22 July 2011

Coldest feels-like

-27.3 °C

17 January 1982

Snowiest day

34.5 cm

20 March 1958

Sunniest day

14.1 h

5 July 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.1 °C24 June 2025	-13.0 °C23 January 2025	14.4 °C	1,188 mm	41	60
2024	38.1 °C16 July 2024	-9.3 °C22 January 2024	15.3 °C	1,059 mm	49	45
2023	37.3 °C27 July 2023	-8.3 °C4 February 2023	15.5 °C	1,031 mm	48	21
2022	35.6 °C17 June 2022	-12.3 °C24 December 2022	14.6 °C	1,315 mm	50	63
2021	35.8 °C30 June 2021	-4.6 °C30 January 2021	15.3 °C	1,020 mm	58	42
2020	37.4 °C20 July 2020	-6.3 °C15 February 2020	15.4 °C	1,495 mm	56	30
2019	37.6 °C21 July 2019	-12.9 °C31 January 2019	15.3 °C	1,082 mm	78	50
2018	35.0 °C3 July 2018	-13.7 °C7 January 2018	14.7 °C	1,683 mm	58	54
2017	35.6 °C13 July 2017	-9.6 °C28 December 2017	15.3 °C	1,037 mm	55	46
2016	36.9 °C14 August 2016	-11.2 °C14 February 2016	14.9 °C	1,145 mm	56	47
2015	36.3 °C23 June 2015	-16.4 °C20 February 2015	14.6 °C	1,021 mm	52	60
2014	36.3 °C18 June 2014	-15.8 °C23 January 2014	13.6 °C	995 mm	37	72
2013	35.1 °C19 July 2013	-9.3 °C23 January 2013	14.1 °C	1,165 mm	45	53
2012	40.6 °C29 June 2012	-8.8 °C4 January 2012	15.6 °C	893 mm	54	25
2011	39.0 °C9 June 2011	-10.4 °C24 January 2011	15.0 °C	1,260 mm	58	49
2010	38.7 °C24 July 2010	-10.2 °C31 January 2010	14.8 °C	1,016 mm	82	70
2009	36.0 °C10 August 2009	-14.2 °C17 January 2009	14.0 °C	1,299 mm	35	67
2008	38.7 °C10 June 2008	-8.6 °C21 January 2008	14.4 °C	1,021 mm	52	48
2007	37.7 °C8 August 2007	-12.3 °C6 February 2007	14.8 °C	809 mm	63	54
2006	37.0 °C3 August 2006	-10.1 °C19 February 2006	15.0 °C	1,120 mm	52	36
2005	38.0 °C27 July 2005	-11.4 °C24 January 2005	14.2 °C	1,002 mm	54	65
2004	33.8 °C5 July 2004	-12.5 °C10 January 2004	14.1 °C	1,109 mm	29	63
2003	34.2 °C5 July 2003	-11.8 °C18 January 2003	13.3 °C	1,399 mm	30	70
2002	36.3 °C4 July 2002	-8.9 °C7 December 2002	14.9 °C	953 mm	64	47
2001	35.4 °C9 August 2001	-5.7 °C23 February 2001	14.6 °C	894 mm	28	50
2000	34.4 °C11 June 2000	-11.0 °C22 January 2000	13.8 °C	950 mm	29	62
1999	37.9 °C5 July 1999	-8.1 °C6 January 1999	14.6 °C	1,018 mm	52	49
1998	35.6 °C26 June 1998	-6.3 °C1 January 1998	15.4 °C	959 mm	52	28
1997	36.3 °C15 July 1997	-13.9 °C19 January 1997	13.7 °C	952 mm	39	47
1996	33.2 °C20 May 1996	-17.5 °C5 February 1996	13.2 °C	1,379 mm	20	62
1995	38.6 °C15 July 1995	-13.4 °C6 February 1995	14.3 °C	998 mm	55	61
1994	36.9 °C15 June 1994	-20.2 °C19 January 1994	14.3 °C	1,098 mm	51	50
1993	37.8 °C10 July 1993	-11.0 °C19 February 1993	14.0 °C	1,081 mm	61	57
1992	36.9 °C14 July 1992	-9.1 °C19 January 1992	13.2 °C	1,027 mm	26	58
1991	37.5 °C23 July 1991	-7.6 °C16 February 1991	15.0 °C	965 mm	65	48
1990	37.6 °C5 July 1990	-9.8 °C26 February 1990	15.1 °C	1,070 mm	42	30
1989	36.2 °C11 July 1989	-15.2 °C22 December 1989	13.4 °C	1,375 mm	35	73
1988	38.5 °C16 July 1988	-15.4 °C16 January 1988	13.6 °C	892 mm	67	65
1987	38.4 °C21 July 1987	-13.1 °C27 January 1987	14.0 °C	996 mm	60	61
1986	36.8 °C7 July 1986	-10.5 °C28 January 1986	14.1 °C	880 mm	64	61
1985	36.6 °C14 August 1985	-19.1 °C21 January 1985	14.3 °C	954 mm	49	68
1984	34.6 °C9 June 1984	-16.7 °C22 January 1984	13.7 °C	1,138 mm	38	62
1983	39.2 °C20 August 1983	-16.7 °C25 December 1983	13.9 °C	1,251 mm	58	51
1982	34.3 °C26 July 1982	-20.3 °C17 January 1982	13.5 °C	1,053 mm	26	62
1981	36.2 °C25 June 1981	-14.4 °C13 January 1981	13.3 °C	788 mm	35	73
1980	37.0 °C20 July 1980	-12.5 °C26 December 1980	13.7 °C	861 mm	64	68
1979	34.8 °C10 August 1979	-18.0 °C18 February 1979	13.5 °C	1,234 mm	26	64
1978	36.3 °C23 July 1978	-10.9 °C10 January 1978	13.3 °C	1,167 mm	45	77
1977	36.4 °C21 July 1977	-18.9 °C17 January 1977	14.0 °C	925 mm	61	74
1976	33.8 °C27 June 1976	-12.5 °C19 January 1976	13.5 °C	931 mm	45	75
1975	34.9 °C4 August 1975	-8.4 °C19 December 1975	14.1 °C	1,231 mm	35	53
1974	34.7 °C15 July 1974	-7.3 °C10 February 1974	14.0 °C	991 mm	35	48
1973	35.7 °C28 August 1973	-11.8 °C17 February 1973	14.3 °C	1,073 mm	42	50
1972	35.1 °C21 July 1972	-15.7 °C16 January 1972	13.3 °C	1,226 mm	29	56
1971	33.8 °C8 July 1971	-12.3 °C2 February 1971	13.9 °C	1,187 mm	35	56
1970	36.3 °C4 July 1970	-16.6 °C9 January 1970	13.6 °C	870 mm	59	72
1969	36.3 °C5 July 1969	-10.6 °C5 January 1969	13.1 °C	1,107 mm	36	83
1968	37.1 °C25 August 1968	-15.5 °C12 January 1968	13.3 °C	940 mm	42	76
1967	33.4 °C25 June 1967	-11.8 °C8 February 1967	12.8 °C	1,000 mm	28	70
1966	38.3 °C3 July 1966	-13.8 °C29 January 1966	13.0 °C	916 mm	64	71
1965	34.8 °C27 May 1965	-14.9 °C18 January 1965	13.2 °C	677 mm	51	72
1964	36.7 °C10 June 1964	-16.3 °C15 January 1964	13.4 °C	1,018 mm	46	68
1963	35.3 °C19 July 1963	-13.8 °C24 January 1963	12.8 °C	878 mm	47	76
1962	37.1 °C20 August 1962	-13.3 °C11 February 1962	12.9 °C	1,030 mm	44	69
1961	34.1 °C22 July 1961	-16.3 °C26 January 1961	13.4 °C	1,108 mm	56	58
1960	34.8 °C23 July 1960	-16.8 °C23 December 1960	13.1 °C	1,042 mm	42	82
1959	38.7 °C29 June 1959	-11.0 °C6 January 1959	14.4 °C	955 mm	57	59
1958	34.4 °C3 July 1958	-15.0 °C17 February 1958	12.7 °C	1,234 mm	34	66
1957	38.9 °C21 July 1957	-17.4 °C18 January 1957	14.1 °C	1,042 mm	61	45
1956	37.1 °C2 July 1956	-7.6 °C25 January 1956	13.6 °C	1,124 mm	42	49
1955	36.0 °C22 July 1955	-12.2 °C3 February 1955	13.7 °C	1,000 mm	43	73
1954	38.3 °C31 July 1954	-12.0 °C18 January 1954	14.1 °C	854 mm	53	55
1953	38.1 °C31 August 1953	-7.3 °C18 December 1953	14.8 °C	1,014 mm	55	35
1952	38.3 °C26 June 1952	-8.7 °C30 January 1952	14.1 °C	1,299 mm	50	39
1951	34.6 °C23 July 1951	-10.4 °C3 February 1951	13.8 °C	982 mm	42	62
1950	34.4 °C24 June 1950	-9.7 °C27 December 1950	13.5 °C	1,012 mm	26	56
1949	36.5 °C10 August 1949	-5.1 °C30 January 1949	14.8 °C	913 mm	43	40
1948	35.6 °C29 August 1948	-13.8 °C31 January 1948	13.4 °C	1,297 mm	39	62
1947	33.6 °C14 August 1947	-12.1 °C5 February 1947	13.3 °C	916 mm	26	74
1946	32.7 °C18 June 1946	-9.9 °C28 January 1946	14.2 °C	947 mm	20	44
1945	36.2 °C1 July 1945	-11.3 °C25 January 1945	13.7 °C	1,197 mm	23	59
1944	35.4 °C30 July 1944	-6.7 °C9 January 1944	13.7 °C	1,085 mm	48	63
1943	35.7 °C14 August 1943	-12.9 °C15 February 1943	13.5 °C	823 mm	62	68
1942	35.6 °C19 July 1942	-13.0 °C21 December 1942	13.7 °C	1,262 mm	29	58
1941	35.6 °C28 July 1941	-8.6 °C18 March 1941	13.9 °C	888 mm	45	75
1940	35.6 °C26 July 1940	-13.9 °C27 January 1940	12.7 °C	1,122 mm	20	70

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

18.7 °C

+0.3 °C

Hot days (≥ 30 °C)

41 d/yr

-5

Frost days (< 0 °C)

60 d/yr

Annual rainfall

1188 mm

+127 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	3.6 °C	-2.1 °C	55 mm	-24 mm
Feb	7.9 °C	+0.4 °C	97 mm	+22 mm
Mar	16.5 °C	+4.2 °C	65 mm	-31 mm
Apr	20.4 °C	+2.1 °C	85 mm	+0 mm
May	23.3 °C	0.0 °C	187 mm	+92 mm
Jun	29.1 °C	+1.1 °C	141 mm	+52 mm
Jul	30.8 °C	+0.6 °C	286 mm	+179 mm
Aug	26.9 °C	-2.1 °C	23 mm	-76 mm
Sep	25.5 °C	0.0 °C	108 mm	+16 mm
Oct	19.5 °C	-0.2 °C	60 mm	-20 mm
Nov	14.0 °C	+0.4 °C	34 mm	-47 mm
Dec	6.6 °C	-1.3 °C	47 mm	-36 mm

The year's extremes

Hottest day

36.1 °C

24 Jun 2025

Coldest day

-13.0 °C

23 Jan 2025

Wettest day

52.2 mm

14 Jul 2025

Windiest day

36.7 km/h

16 Feb 2025

Strongest gust

80.3 km/h

16 Feb 2025

Hottest feels-like

43.0 °C

24 Jun 2025

Coldest feels-like

-17.3 °C

23 Jan 2025

Snowiest day

16.7 cm

6 Jan 2025

Sunniest day

14.1 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 Greater Upper Marlboro?

Greater Upper Marlboro has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,061 mm of precipitation per year.

What is the hottest day ever recorded in Greater Upper Marlboro?

The hottest day measured in Greater Upper Marlboro between 1940 and 2025 was 29 June 2012, reaching 40.6 °C.

What is the coldest day in Greater Upper Marlboro?

The coldest day measured in Greater Upper Marlboro between 1940 and 2025 was 17 January 1982, at -20.3 °C.

Does it snow in Greater Upper Marlboro?

Yes. Greater Upper Marlboro gets on average 37.7 cm of snow per year and has around 58 frost days.

Has the climate of Greater Upper Marlboro warmed?

Yes: Greater Upper Marlboro warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Greater Upper Marlboro?

The wettest day measured in Greater Upper Marlboro between 1940 and 2025 was 16 September 1999, with 146 mm of rain in 24 hours.

What was the windiest day in Greater Upper Marlboro?

The windiest day measured in Greater Upper Marlboro between 1940 and 2025 was 1 December 1974, with winds reaching 49.3 km/h.

What is the warmest month in Greater Upper Marlboro?

The warmest month in Greater Upper Marlboro is July (25.7 °C on average); the coldest is January (1.9 °C).

How much does it rain in Greater Upper Marlboro?

Greater Upper Marlboro receives on average 1,061 mm of precipitation per year, spread over about 117 rainy days.

Is it sunny in Greater Upper Marlboro?

Greater Upper Marlboro gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.

What is the biggest single-day snowfall in Greater Upper Marlboro?

The heaviest 24-hour snowfall measured in Greater Upper Marlboro between 1940 and 2025 was 20 March 1958, with 34.5 cm.

Are there tropical nights in Greater Upper Marlboro?

Yes: Greater Upper Marlboro has on average 71 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Greater Upper Marlboro?

In Greater Upper Marlboro, between 1940 and 2025, the highest apparent temperature reached 45.4 °C on 22 July 2011, and the lowest was -27.3 °C on 17 January 1982.

Compare Greater Upper Marlboro with another city

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