United States · 1991–2020

Best time to visit
Grasonville.

May leads for comfortable weather in Grasonville: typically 22.8°C by day, 14.5°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high22.8°C

Typical low14.5°C

Rain in May94 mm

Comfort

May

May · September · October

82climate match

Beach

August

August · July · June

78climate match

Outdoors

April

April · October · May

77climate match

The weakest month is January, scoring 5 against May’s 82 — days reach only 6°C, 18° 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

56° / -1.4°

Feb

87.3° / -0.6°

Mar

2811.8° / 3.3°

Apr

5718° / 8.9°

May

8222.8° / 14.5°

Jun

6227.7° / 19.8°

Jul

5030.2° / 22.6°

Aug

5529.1° / 21.9°

Sep

7425.7° / 18.5°

Oct

6519.6° / 11.8°

Nov

4113.7° / 5.8°

Dec

128.7° / 1.5°

Monthly climate evidence for Grasonville — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 17 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	6°C	-1.4°C	63 mm	7.3	3.4°C	9 h 43	5	Good coverage
February	7.3°C	-0.6°C	68 mm	7.7	2.4°C	10 h 40	8	Good coverage
March	11.8°C	3.3°C	83 mm	7.8	4.2°C	11 h 50	28	Good coverage
April	18°C	8.9°C	89 mm	8.1	8.5°C	13 h 10	57	Good coverage
May	22.8°C	14.5°C	94 mm	8.9	14.2°C	14 h 17	82	Good coverage
June	27.7°C	19.8°C	120 mm	9.2	20.2°C	14 h 53	62	Good coverage
July	30.2°C	22.6°C	113 mm	8.2	24.7°C	14 h 39	50	Good coverage
August	29.1°C	21.9°C	119 mm	7.6	25.7°C	13 h 41	55	Good coverage
September	25.7°C	18.5°C	111 mm	6.3	23.4°C	12 h 24	74	Good coverage
October	19.6°C	11.8°C	110 mm	7.5	18.3°C	11 h 07	65	Good coverage
November	13.7°C	5.8°C	76 mm	6.3	12.1°C	9 h 59	41	Good coverage
December	8.7°C	1.5°C	92 mm	8.1	7.0°C	9 h 27	12	Good coverage

Records at ANNAPOLIS US NAVAL ACADEMY ASO, 1945–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.0°C26 Jan 2024	-14.9°C7 Jan 2014	57 mm9 Jan 2024	150 mm2024 · driest 4 mm in 2023	41
February	28.3°C21 Feb 2018	-16.1°C2 Feb 1961	56 mm22 Feb 2003	176 mm1961 · driest 8 mm in 2009	41
March	29.4°C16 Mar 1945	-9.9°C7 Mar 2015	61 mm23 Mar 2005	172 mm1958 · driest 3 mm in 2006	42
April	32.8°C27 Apr 2009	-4.4°C14 Apr 1950	69 mm15 Apr 2007	185 mm1952 · driest 39 mm in 2016	42
May	34.4°C29 May 2019	2.8°C9 May 2020	83 mm12 May 2008	269 mm2008 · driest 20 mm in 1957	42
June	37.8°C29 Jun 1959	9.4°C6 Jun 1945	110 mm25 Jun 2006	331 mm2006 · driest 20 mm in 1949	42
July	39.4°C7 Jul 2012	15.0°C3 Jul 1957	152 mm18 Jul 1945	301 mm1945 · driest 9 mm in 2009	42
August	38.9°C31 Aug 1953	13.3°C31 Aug 1946	125 mm27 Aug 2011	272 mm1955 · driest 22 mm in 2025	41
September	35.6°C4 Sep 2023	6.7°C21 Sep 1956	224 mm30 Sep 2010	285 mm2010 · driest 2 mm in 2005	41
October	34.4°C2 Oct 2019	-1.1°C21 Oct 1952	149 mm29 Oct 2012	228 mm2012 · driest 8 mm in 2024	42
November	27.2°C3 Nov 2016	-7.8°C29 Nov 1955	70 mm21 Nov 1952	200 mm2018 · driest 13 mm in 2016	42
December	23.9°C1 Dec 2006	-13.2°C24 Dec 2022	74 mm7 Dec 2011	202 mm2023 · driest 10 mm in 1955	42

Typical days per month at ANNAPOLIS US NAVAL ACADEMY ASO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	20	2
February	<1	0	17	2
March	<1	0	7	2
April	3	<1	<1	3
May	11	2	0	3
June	24	9	0	4
July	30	17	0	4
August	29	13	0	4
September	19	4	0	3
October	4	<1	0	3
November	<1	0	2	3
December	0	0	13	4

How often, not how much — every day in ANNAPOLIS US NAVAL ACADEMY ASO’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	1%	25%	7%	26%	2.5–8.8°C
February	2%	26%	8%	32%	3.3–9.9°C
March	8%	27%	9%	28%	8.7–14.5°C
April	26%	27%	10%	30%	15.8–19.8°C
May	52%	32%	11%	40%	20.3–24.5°C
June	71%	28%	10%	32%	25.6–28.9°C
July	73%	27%	11%	31%	27.8–31.3°C
August	75%	25%	11%	25%	27.0–30.0°C
September	74%	22%	9%	21%	23.8–26.8°C
October	39%	22%	9%	20%	17.9–21.2°C
November	8%	22%	7%	20%	11.5–15.5°C
December	1%	25%	10%	26%	4.1–10.9°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 40-year average. Warmest: 2012. Coolest: 1958.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4356634
NOAA station: USW00013752 · ANNAPOLIS US NAVAL ACADEMY ASO
Station distance: 24.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 38.96°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 17 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 ANNAPOLIS US NAVAL ACADEMY ASO is what differs

Annapolis→Cape Saint Claire→Mayo→Stevensville→Shady Side→Naval Academy→

Or put two places side by side: Grasonville vs Annapolis

Best time to visitGrasonville.

May

August

April

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Grasonville.

The whole year,
without the guesswork.

Nearby, measured,
and named.