United States · 1991–2020

Best time to visit
Aberdeen Proving Ground.

May leads for comfortable weather in Aberdeen Proving Ground: typically 23.4°C by day, 12.1°C at night, with 85 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high23.4°C

Typical low12.1°C

Rain in May85 mm

Comfort

May

May · September · June

82climate match

Beach

August

August · July · June

77climate match

Outdoors

October

October · April · May

85climate match

The weakest month is January, scoring 5 against May’s 82 — days reach only 5.9°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

55.9° / -2.6°

Feb

97.5° / -2.1°

Mar

2511.8° / 1.3°

Apr

5918.7° / 6.8°

May

8223.4° / 12.1°

Jun

6828.3° / 17.4°

Jul

5330.7° / 20.4°

Aug

6029.6° / 19.3°

Sep

7926.1° / 15.5°

Oct

6519.8° / 8.7°

Nov

3713.5° / 3.5°

Dec

87.9° / -0.3°

Monthly climate evidence for Aberdeen Proving Ground — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 43 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	5.9°C	-2.6°C	64 mm	5.9	3.2°C	9 h 40	5	Strong coverage
February	7.5°C	-2.1°C	60 mm	5.9	2.3°C	10 h 39	9	Strong coverage
March	11.8°C	1.3°C	86 mm	6.5	4.2°C	11 h 49	25	Strong coverage
April	18.7°C	6.8°C	72 mm	6.6	8.5°C	13 h 11	59	Strong coverage
May	23.4°C	12.1°C	85 mm	7.8	14.2°C	14 h 19	82	Strong coverage
June	28.3°C	17.4°C	98 mm	8	20.2°C	14 h 56	68	Strong coverage
July	30.7°C	20.4°C	115 mm	7.9	24.7°C	14 h 42	53	Strong coverage
August	29.6°C	19.3°C	105 mm	7.1	25.7°C	13 h 43	60	Strong coverage
September	26.1°C	15.5°C	104 mm	6.5	23.3°C	12 h 24	79	Strong coverage
October	19.8°C	8.7°C	86 mm	5.8	18.2°C	11 h 05	65	Strong coverage
November	13.5°C	3.5°C	72 mm	5.8	11.9°C	9 h 57	37	Strong coverage
December	7.9°C	-0.3°C	90 mm	6.7	6.8°C	9 h 24	8	Strong coverage

What has changed

Aberdeen Proving Ground runs +0.0°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

+0.5

Feb

+0.5

Mar

-0.5

Apr

-0.6

May

-0.4

Jun

-0.1

Jul

+0.6

Aug

-0.3

Sep

0.0

Oct

+0.2

Nov

-0.4

Dec

+0.9

May daytime highs, 2011–2025. Last recorded: 22.6°C.

Records at ABERDEEN PHILLIPS FLD, 1919–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C26 Jan 1950	-24.4°C28 Jan 1935	60 mm1 Jan 1976	178 mm1936 · driest 1 mm in 2026	98
February	27.2°C25 Feb 1930	-25.0°C28 Feb 1934	70 mm24 Feb 2003	158 mm2003 · driest 7 mm in 2009	98
March	31.1°C30 Mar 1998	-16.1°C12 Mar 1934	79 mm21 Mar 2000	186 mm1983 · driest 4 mm in 2006	98
April	34.4°C17 Apr 2002	-10.6°C1 Apr 1923	88 mm16 Apr 2007	215 mm1983 · driest 5 mm in 2019	98
May	36.1°C23 May 1925	-0.6°C9 May 1947	152 mm1 May 2014	213 mm2014 · driest 5 mm in 1999	97
June	38.3°C25 Jun 2025	4.4°C3 Jun 1986	257 mm22 Jun 1972	368 mm1972 · driest 4 mm in 1954	100
July	40.6°C10 Jul 1936	8.9°C1 Jul 1988	93 mm9 Jul 1935	240 mm1919 · driest 0 mm in 1983	100
August	38.9°C31 Aug 1953	8.9°C24 Aug 1971	184 mm28 Aug 2009	357 mm1971 · driest 0 mm in 1995	99
September	36.7°C12 Sep 1983	1.1°C23 Sep 1947	162 mm3 Sep 1969	288 mm2021 · driest 2 mm in 2019	99
October	35.0°C6 Oct 1941	-6.1°C24 Oct 1969	140 mm1 Oct 2010	218 mm1976 · driest 0 mm in 1994	99
November	29.4°C1 Nov 1950	-13.3°C29 Nov 1930	147 mm2 Nov 1956	232 mm1956 · driest 4 mm in 1990	99
December	23.3°C7 Dec 1998	-17.8°C21 Dec 1942	85 mm18 Dec 2023	222 mm1969 · driest 5 mm in 1995	98

Typical days per month at ABERDEEN PHILLIPS FLD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	18	2	2
February	0	0	16	2	2
March	<1	<1	12	3	<1
April	4	<1	2	2	0
May	11	3	0	2	0
June	22	10	0	3	0
July	26	17	0	3	0
August	25	13	0	3	0
September	16	5	0	3	0
October	4	<1	<1	2	0
November	<1	0	8	2	<1
December	0	0	15	3	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 85); on 2011–2025 it is May (86). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in ABERDEEN PHILLIPS FLD’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%	23%	8%	21%	2.1–8.7°C
February	2%	23%	8%	21%	3.3–10.1°C
March	9%	24%	9%	25%	8.3–14.7°C
April	29%	25%	9%	26%	15.1–20.4°C
May	56%	28%	10%	31%	21.1–25.1°C
June	71%	27%	11%	26%	26.3–29.6°C
July	75%	24%	11%	22%	28.8–31.9°C
August	74%	25%	11%	23%	27.4–30.6°C
September	74%	21%	9%	18%	23.9–27.7°C
October	42%	19%	8%	15%	17.6–21.6°C
November	9%	21%	8%	18%	10.8–15.8°C
December	<1%	23%	9%	22%	4.2–10.1°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.

1920Each stripe is one year’s mean temperature against the 93-year average. Warmest: 1998. Coolest: 1926.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 7257914
NOAA station: USW00013701 · ABERDEEN PHILLIPS FLD
Station distance: 3.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 39.47°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 43 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 ABERDEEN PHILLIPS FLD is what differs

South Bel Air→Bel Air South→North Bel Air→Bel Air North→Edgewood→Aberdeen→

Or put two places side by side: Aberdeen Proving Ground vs South Bel Air

Best time to visitAberdeen Proving Ground.

May

August

October

The whole year,without the guesswork.

Aberdeen Proving Ground runs +0.0°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Aberdeen Proving Ground.

The whole year,
without the guesswork.

Aberdeen Proving Ground runs +0.0°C
on the 1961–1990 baseline.

Nearby, measured,
and named.