United States · 1991–2020

Best time to visit
Blackwater.

May leads for comfortable weather in Blackwater: typically 23.6°C by day, 13.9°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.6°C

Typical low13.9°C

Rain in May95 mm

Comfort

May

May · September · October

83climate match

Beach

August

August · July · June

78climate match

Outdoors

October

October · April · May

81climate match

The weakest month is January, scoring 5 against May’s 83 — days reach only 7.1°C, 17° below the 24°C the score treats as ideal.

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

57.1° / -1.7°

Feb

118.4° / -0.8°

Mar

2612.5° / 2.8°

Apr

5818.8° / 8.3°

May

8323.6° / 13.9°

Jun

6328.4° / 18.9°

Jul

5130.7° / 21.5°

Aug

5629.5° / 20.6°

Sep

7626.3° / 17.2°

Oct

6820.5° / 10.8°

Nov

4114.4° / 4.8°

Dec

159.9° / 1.1°

Monthly climate evidence for Blackwater — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 20 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	7.1°C	-1.7°C	71 mm	7.4	3.6°C	9 h 46	5	Strong coverage
February	8.4°C	-0.8°C	74 mm	7.4	2.7°C	10 h 42	11	Strong coverage
March	12.5°C	2.8°C	101 mm	8.9	4.4°C	11 h 50	26	Strong coverage
April	18.8°C	8.3°C	92 mm	8.5	8.6°C	13 h 08	58	Strong coverage
May	23.6°C	13.9°C	95 mm	9.3	14.1°C	14 h 14	83	Strong coverage
June	28.4°C	18.9°C	109 mm	8.7	20.2°C	14 h 49	63	Strong coverage
July	30.7°C	21.5°C	113 mm	7.8	24.8°C	14 h 35	51	Strong coverage
August	29.5°C	20.6°C	122 mm	7.1	25.7°C	13 h 39	56	Strong coverage
September	26.3°C	17.2°C	102 mm	6.3	23.5°C	12 h 23	76	Strong coverage
October	20.5°C	10.8°C	105 mm	6.6	18.6°C	11 h 08	68	Strong coverage
November	14.4°C	4.8°C	79 mm	6.5	12.6°C	10 h 02	41	Strong coverage
December	9.9°C	1.1°C	92 mm	8.7	7.4°C	9 h 30	15	Strong coverage

What has changed

Blackwater runs +1.5°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.8

Feb

+2.3

Mar

+1.3

Apr

+2.0

May

+1.4

Jun

+1.5

Jul

+1.6

Aug

+0.7

Sep

+1.3

Oct

+1.8

Nov

+0.4

Dec

+2.2

May daytime highs, 2011–2025. Last recorded: 25.1°C.

Records at PATUXENT RIVER NAS, 1945–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	27.8°C1 Jan 2019	-19.4°C17 Jan 1965	67 mm28 Jan 1998	175 mm1987 · driest 12 mm in 1981	77
February	27.2°C24 Feb 1985	-18.8°C21 Feb 2015	90 mm4 Feb 1998	192 mm1998 · driest 11 mm in 2009	78
March	31.1°C29 Mar 1989	-12.7°C6 Mar 2015	92 mm2 Mar 1994	316 mm1994 · driest 11 mm in 2016	79
April	33.9°C26 Apr 1990	-3.8°C6 Apr 2016	122 mm30 Apr 1996	243 mm2004 · driest 11 mm in 1985	79
May	37.8°C20 May 1996	2.2°C10 May 2020	110 mm29 May 1984	286 mm1990 · driest 13 mm in 1965	79
June	38.9°C28 Jun 2010	6.7°C5 Jun 1997	150 mm20 Jun 1983	251 mm2015 · driest 6 mm in 1954	78
July	40.0°C25 Jul 2010	12.2°C25 Jul 1997	117 mm30 Jul 1960	394 mm1945 · driest 20 mm in 2007	80
August	39.4°C20 Aug 1983	11.1°C24 Aug 1985	203 mm27 Aug 2011	362 mm2020 · driest 16 mm in 1966	79
September	37.2°C11 Sep 1983	6.7°C26 Sep 2001	299 mm30 Sep 2010	368 mm2010 · driest 2 mm in 1978	79
October	37.8°C2 Oct 2019	-1.1°C29 Oct 1965	153 mm29 Oct 2012	229 mm2012 · driest 0 mm in 1963	80
November	29.4°C2 Nov 1968	-8.9°C29 Nov 1955	107 mm2 Nov 1956	202 mm1956 · driest 6 mm in 2001	79
December	27.2°C7 Dec 1998	-14.4°C24 Dec 1983	81 mm24 Dec 1986	182 mm2009 · driest 12 mm in 1965	78

Typical days per month at PATUXENT RIVER NAS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	<1	0	20	3	2
February	<1	0	17	3	2
March	1	<1	10	3	<1
April	5	1	<1	3	0
May	13	4	0	3	0
June	25	11	0	3	0
July	30	19	0	3	0
August	29	14	0	4	0
September	20	6	0	3	0
October	5	<1	<1	3	0
November	<1	0	5	2	0
December	<1	0	14	3	<1

How often, not how much — every day in PATUXENT RIVER NAS’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%	9%	28%	3.6–10.1°C
February	4%	27%	9%	32%	4.7–11.2°C
March	10%	28%	10%	31%	9.7–15.8°C
April	28%	27%	10%	31%	16.3–20.7°C
May	56%	30%	11%	36%	21.0–25.2°C
June	73%	27%	10%	27%	26.1–29.5°C
July	73%	27%	11%	31%	28.5–32.3°C
August	77%	24%	10%	21%	27.5–31.0°C
September	75%	21%	9%	21%	24.5–28.0°C
October	45%	20%	8%	18%	17.9–22.5°C
November	12%	23%	9%	19%	12.1–16.8°C
December	3%	26%	10%	27%	5.6–12.7°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.

1946Each stripe is one year’s mean temperature against the 73-year average. Warmest: 2024. Coolest: 1988.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4348877
NOAA station: USW00013721 · PATUXENT RIVER NAS
Station distance: 25.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 38.39°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 20 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 PATUXENT RIVER NAS is what differs

Lexington Park→Fishing Creek→Andrews→Applegarth (historical)→Bishops Head→Cedar Cove→

Or put two places side by side: Blackwater vs Lexington Park

Best time to visitBlackwater.

May

August

October

The whole year,without the guesswork.

Blackwater runs +1.5°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Blackwater.

The whole year,
without the guesswork.

Blackwater runs +1.5°C
on the 1961–1990 baseline.

Nearby, measured,
and named.