United States · 1991–2020

Best time to visit
Annapolis.

August leads for comfortable weather in Annapolis: typically 20°C by day, 8.6°C at night, with 3 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high20°C

Typical low8.6°C

Rain in August3 mm

Comfort

August

August · September · July

75climate match

Beach

August

August · September · July

38climate match

Outdoors

August

August · September · July

97climate match

The weakest month is January, scoring 24 against August’s 75 — days reach only 14.4°C, 10° below the 24°C the score treats as ideal, and 178 mm of rain falls.

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

2414.4° / 5.1°

Feb

3115.4° / 5°

Mar

3815.6° / 5.3°

Apr

5116.3° / 5.6°

May

6317.6° / 6.7°

Jun

7019.1° / 7.3°

Jul

7319.2° / 8.7°

Aug

7520° / 8.6°

Sep

7520.1° / 8.5°

Oct

6819.1° / 7.5°

Nov

4816.5° / 6.1°

Dec

2514.6° / 4.9°

Monthly climate evidence for Annapolis — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 11 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	14.4°C	5.1°C	178 mm	10.7	11.6°C	9 h 44	24	Good coverage
February	15.4°C	5°C	163 mm	8.9	11.7°C	10 h 41	31	Good coverage
March	15.6°C	5.3°C	122 mm	8.3	11.4°C	11 h 50	38	Good coverage
April	16.3°C	5.6°C	65 mm	5.7	10.8°C	13 h 09	51	Strong coverage
May	17.6°C	6.7°C	35 mm	3.6	10.7°C	14 h 16	63	Strong coverage
June	19.1°C	7.3°C	18 mm	1	10.7°C	14 h 51	70	Strong coverage
July	19.2°C	8.7°C	2 mm	0.3	11.3°C	14 h 37	73	Strong coverage
August	20°C	8.6°C	3 mm	0.4	12.1°C	13 h 40	75	Good coverage
September	20.1°C	8.5°C	4 mm	1	12.8°C	12 h 23	75	Strong coverage
October	19.1°C	7.5°C	46 mm	3.4	12.7°C	11 h 07	68	Strong coverage
November	16.5°C	6.1°C	92 mm	6.5	12.4°C	10 h 01	48	Good coverage
December	14.6°C	4.9°C	171 mm	10	11.9°C	9 h 28	25	Good coverage

What has changed

Annapolis runs +0.2°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

+1.5

Feb

+0.6

Mar

-0.2

Apr

+0.1

May

+0.1

Jun

+0.2

Jul

-0.7

Aug

+0.1

Sep

-0.4

Oct

+0.2

Nov

+0.5

Dec

+0.8

August daytime highs, 2011–2025. Last recorded: 18.7°C.

Records at FT ROSS, 1897–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	28.3°C26 Jan 1899	-5.6°C16 Jan 1987	145 mm14 Jan 1956	529 mm1899 · driest 3 mm in 2007	83
February	26.1°C7 Feb 1987	-6.7°C9 Feb 2020	198 mm28 Feb 2019	642 mm1902 · driest 1 mm in 2020	81
March	25.6°C7 Mar 1953	-6.1°C9 Mar 2020	165 mm10 Mar 1904	667 mm1904 · driest 5 mm in 2026	82
April	30.0°C2 Apr 2000	-3.3°C26 Apr 1994	107 mm27 Apr 1953	218 mm2018 · driest 3 mm in 1964	87
May	29.4°C18 May 1997	-3.3°C4 May 2020	93 mm31 May 1899	193 mm1898 · driest 0 mm in 1982	85
June	31.7°C12 Jun 2019	-0.6°C7 Jun 2020	66 mm8 Jun 2005	99 mm1906 · driest 0 mm in 2018	84
July	31.1°C1 Jul 1898	1.7°C10 Jul 1991	64 mm8 Jul 1974	64 mm1974 · driest 0 mm in 1982	83
August	33.3°C28 Aug 2017	-1.7°C8 Aug 2020	35 mm20 Aug 1997	62 mm1954 · driest 0 mm in 1902	80
September	36.1°C3 Sep 1950	-1.1°C11 Sep 2020	85 mm18 Sep 1959	107 mm1904 · driest 0 mm in 1998	83
October	33.9°C29 Oct 2003	-3.9°C29 Oct 2020	105 mm9 Oct 1957	257 mm1957 · driest 0 mm in 1995	84
November	31.1°C6 Nov 2019	-4.4°C29 Nov 2019	128 mm9 Nov 1902	461 mm1973 · driest 2 mm in 1959	83
December	24.4°C14 Dec 1958	-6.7°C8 Dec 1972	144 mm30 Dec 1904	502 mm1955 · driest 0 mm in 1989	83

Typical days per month at FT ROSS, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	2	5
February	0	2	4
March	0	<1	4
April	<1	<1	2
May	<1	<1	1
June	<1	<1	<1
July	<1	0	0
August	<1	<1	0
September	2	<1	0
October	2	<1	2
November	<1	<1	3
December	0	2	4

How often, not how much — every day in FT ROSS’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%	36%	19%	45%	12.3–15.3°C
February	4%	36%	19%	44%	13.1–16.4°C
March	6%	31%	15%	37%	13.4–17.3°C
April	8%	20%	8%	20%	14.2–17.5°C
May	12%	11%	4%	9%	15.4–18.7°C
June	29%	5%	2%	2%	17.0–20.1°C
July	36%	1%	<1%	0%	17.7–20.8°C
August	45%	2%	<1%	<1%	18.1–21.0°C
September	49%	6%	2%	4%	18.2–21.8°C
October	33%	14%	6%	15%	17.2–20.7°C
November	11%	27%	13%	33%	15.0–18.0°C
December	2%	33%	18%	41%	12.8–15.8°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.

1899Each stripe is one year’s mean temperature against the 55-year average. Warmest: 1958. Coolest: 1975.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5324069
NOAA station: USC00043191 · FT ROSS
Station distance: 25.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 38.72°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 11 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 FT ROSS is what differs

Sea Ranch→Cazadero→Anchor Bay→Jenner→Camp Thayer→Dorr Place→

Or put two places side by side: Annapolis vs Sea Ranch

Best time to visitAnnapolis.

August

August

August

The whole year,without the guesswork.

Annapolis runs +0.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Annapolis.

The whole year,
without the guesswork.

Annapolis runs +0.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.