United States · 1991–2020

Best time to visit
Lanham.

May leads for comfortable weather in Lanham: typically 24.3°C by day, 10.1°C at night, with 100 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high24.3°C

Typical low10.1°C

Rain in May100 mm

Comfort

May

May · September · June

77climate match

Beach

August

August · July · June

72climate match

Outdoors

October

October · April · May

80climate match

The weakest month is January, scoring 5 against May’s 77 — days reach only 7.2°C, 17° below the 24°C the score treats as ideal, and nights drop to -4.6°C.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

57.2° / -4.6°

Feb

88.9° / -4°

Mar

2113° / -0.7°

Apr

5819.8° / 5°

May

7724.3° / 10.1°

Jun

6828.8° / 15.7°

Jul

5531.3° / 18.5°

Aug

6230.7° / 17.7°

Sep

7526.4° / 13.5°

Oct

6220.2° / 6.1°

Nov

3514.5° / 1.5°

Dec

99° / -2.8°

Monthly climate evidence for Lanham — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 44 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	7.2°C	-4.6°C	79 mm	7.3	3.4°C	9 h 43	5	Good coverage
February	8.9°C	-4°C	70 mm	6.1	2.4°C	10 h 40	8	Good coverage
March	13°C	-0.7°C	104 mm	8.1	4.2°C	11 h 50	21	Good coverage
April	19.8°C	5°C	78 mm	7.5	8.5°C	13 h 10	58	Good coverage
May	24.3°C	10.1°C	100 mm	7.7	14.2°C	14 h 17	77	Good coverage
June	28.8°C	15.7°C	110 mm	7.8	20.2°C	14 h 53	68	Good coverage
July	31.3°C	18.5°C	103 mm	8.2	24.7°C	14 h 39	55	Good coverage
August	30.7°C	17.7°C	91 mm	6.7	25.7°C	13 h 41	62	Good coverage
September	26.4°C	13.5°C	110 mm	7	23.4°C	12 h 24	75	Good coverage
October	20.2°C	6.1°C	87 mm	5.8	18.3°C	11 h 07	62	Good coverage
November	14.5°C	1.5°C	81 mm	5.8	12.1°C	9 h 59	35	Good coverage
December	9°C	-2.8°C	80 mm	6.4	7.0°C	9 h 27	9	Good coverage

Records at GLENN DALE BELL STN, 1921–2007
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C25 Jan 1950	-30.6°C28 Jan 1935	61 mm28 Jan 1922	213 mm1979 · driest 7 mm in 1955	87
February	28.3°C25 Feb 1930	-27.2°C8 Feb 1936	76 mm23 Feb 2003	188 mm2003 · driest 12 mm in 1968	86
March	35.0°C30 Mar 1998	-21.1°C11 Mar 1960	86 mm20 Mar 1958	227 mm1994 · driest 2 mm in 2006	87
April	35.0°C18 Apr 1976	-13.3°C1 Apr 1923	121 mm26 Apr 1937	231 mm1937 · driest 8 mm in 1985	87
May	36.7°C22 May 1941	-4.4°C10 May 1947	132 mm26 May 1997	261 mm1989 · driest 13 mm in 1939	87
June	38.9°C15 Jun 1994	0.0°C1 Jun 1930	149 mm20 Jun 1983	286 mm1983 · driest 11 mm in 1940	86
July	41.1°C10 Jul 1936	4.4°C1 Jul 1988	98 mm27 Jul 1988	312 mm1945 · driest 15 mm in 1998	86
August	40.0°C16 Aug 1997	3.3°C29 Aug 1986	177 mm13 Aug 1955	406 mm1955 · driest 8 mm in 1930	86
September	38.9°C1 Sep 1930	-1.7°C29 Sep 1942	121 mm2 Sep 2006	319 mm1934 · driest 5 mm in 1967	85
October	35.6°C5 Oct 1941	-8.9°C21 Oct 1930	147 mm9 Oct 2005	250 mm1942 · driest 0 mm in 1963	86
November	30.6°C1 Nov 1950	-17.2°C29 Nov 1930	98 mm13 Nov 1937	207 mm1952 · driest 2 mm in 1997	85
December	26.1°C7 Dec 1998	-27.2°C21 Dec 1942	61 mm18 Dec 1977	183 mm1969 · driest 6 mm in 1955	85

Typical days per month at GLENN DALE BELL STN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	23	3	<1
February	<1	0	22	2	<1
March	1	<1	17	3	<1
April	7	2	6	3	0
May	14	5	<1	3	0
June	24	14	0	3	0
July	29	20	0	3	0
August	29	19	0	3	0
September	20	7	0	3	0
October	6	<1	4	3	0
November	1	0	14	2	<1
December	<1	0	21	3	<1

How often, not how much — every day in GLENN DALE BELL STN’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	2%	26%	10%	25%	3.8–10.5°C
February	4%	26%	9%	28%	5.3–11.4°C
March	14%	28%	10%	35%	10.4–16.9°C
April	38%	29%	10%	35%	17.5–22.3°C
May	61%	30%	12%	35%	22.9–26.9°C
June	74%	26%	10%	27%	27.1–30.5°C
July	73%	27%	11%	29%	29.8–32.9°C
August	74%	26%	11%	25%	28.8–31.7°C
September	74%	23%	9%	23%	25.3–29.1°C
October	50%	20%	8%	18%	18.8–22.9°C
November	16%	23%	9%	21%	12.2–17.1°C
December	3%	24%	9%	27%	5.4–11.8°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1921Each stripe is one year’s mean temperature against the 83-year average. Warmest: 1998. Coolest: 1940.2005

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4360321
NOAA station: USC00183675 · GLENN DALE BELL STN
Station distance: 5.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 38.97°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 44 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from GLENN DALE BELL STN is what differs

Bowie→Crofton→Lanham-Seabrook→Seabrook→Glenn Dale→New Carrollton→

Or put two places side by side: Lanham vs Bowie

Best time to visitLanham.

May

August

October

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Lanham.

The whole year,
without the guesswork.

Nearby, measured,
and named.