United States · 1991–2020

Best time to visit
Dover.

September leads for comfortable weather in Dover: typically 27.7°C by day, 15.5°C at night, with 92 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.7°C

Typical low15.5°C

Rain in September92 mm

Comfort

September

September · May · October

76climate match

Beach

August

August · July · June

78climate match

Outdoors

October

October · April · November

76climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 7.8°C, 16° 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

57.8° / -2.5°

Feb

1010.5° / -0.9°

Mar

3215.8° / 3.4°

Apr

5721.4° / 8.3°

May

7225.3° / 13.9°

Jun

6129.1° / 18.5°

Jul

5231° / 20.5°

Aug

5830.9° / 19.8°

Sep

7627.7° / 15.5°

Oct

6721.6° / 8.7°

Nov

3615.3° / 3.4°

Dec

910° / -0.4°

Monthly climate evidence for Dover — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	7.8°C	-2.5°C	100 mm	7.9	9 h 55	5	Strong coverage
February	10.5°C	-0.9°C	124 mm	7.8	10 h 48	10	Strong coverage
March	15.8°C	3.4°C	134 mm	9.6	11 h 51	32	Strong coverage
April	21.4°C	8.3°C	157 mm	9.4	13 h 04	57	Strong coverage
May	25.3°C	13.9°C	144 mm	10.3	14 h 05	72	Strong coverage
June	29.1°C	18.5°C	119 mm	7.8	14 h 38	61	Strong coverage
July	31°C	20.5°C	116 mm	7.3	14 h 25	52	Strong coverage
August	30.9°C	19.8°C	89 mm	6.4	13 h 33	58	Strong coverage
September	27.7°C	15.5°C	92 mm	6.4	12 h 22	76	Strong coverage
October	21.6°C	8.7°C	106 mm	7	11 h 12	67	Strong coverage
November	15.3°C	3.4°C	111 mm	7.6	10 h 10	36	Strong coverage
December	10°C	-0.4°C	125 mm	8.3	9 h 41	9	Strong coverage

What has changed

Dover runs +0.8°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

+1.7

Feb

+2.1

Mar

+1.5

Apr

+0.2

May

0.0

Jun

+0.1

Jul

-0.3

Aug

-0.3

Sep

+0.5

Oct

+0.2

Nov

+0.5

Dec

+2.8

September daytime highs, 2011–2025. Last recorded: 29.6°C.

Records at DOVER 1 W, 1897–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C24 Jan 1943	-31.1°C24 Jan 1963	179 mm8 Jan 1920	606 mm1937 · driest 12 mm in 1943	126
February	28.9°C17 Feb 1911	-29.4°C2 Feb 1951	173 mm16 Feb 2025	339 mm1956 · driest 8 mm in 1947	127
March	33.9°C24 Mar 1910	-19.4°C5 Mar 1960	144 mm2 Mar 1997	380 mm1975 · driest 32 mm in 1911	127
April	36.1°C29 Apr 1899	-6.1°C1 Apr 1923	160 mm4 Apr 1968	353 mm2011 · driest 30 mm in 1915	125
May	37.8°C28 May 1911	-1.1°C7 May 1944	109 mm19 May 1983	350 mm1983 · driest 5 mm in 2005	125
June	42.2°C30 Jun 2012	3.3°C1 Jun 1966	138 mm5 Jun 1998	428 mm1928 · driest 5 mm in 1901	127
July	43.3°C22 Jul 1901	6.7°C23 Jul 1947	99 mm7 Jul 2016	245 mm2026 · driest 10 mm in 2014	128
August	41.7°C8 Aug 1930	6.7°C31 Aug 1946	193 mm31 Aug 1982	270 mm1982 · driest 0 mm in 1999	124
September	41.1°C5 Sep 1925	-4.4°C27 Sep 1940	135 mm22 Sep 1919	230 mm1927 · driest 4 mm in 1928	125
October	35.6°C2 Oct 1910	-7.2°C29 Oct 1952	105 mm7 Oct 1927	273 mm1919 · driest 0 mm in 1963	123
November	30.6°C5 Nov 1909	-21.7°C25 Nov 1950	107 mm1 Nov 1903	359 mm1957 · driest 0 mm in 1910	128
December	26.1°C31 Dec 1951	-27.8°C9 Dec 1917	125 mm22 Dec 1990	358 mm1990 · driest 19 mm in 1976	129

Typical days per month at DOVER 1 W, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	19	3	<1
February	<1	0	16	4	<1
March	3	<1	9	4	<1
April	9	<1	2	5	0
May	18	4	0	4	0
June	25	13	0	4	0
July	28	20	0	3	0
August	28	19	0	3	0
September	22	9	0	3	0
October	10	<1	1	3	0
November	1	0	8	3	<1
December	0	0	16	4	<1

How often, not how much — every day in DOVER 1 W’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	3%	27%	12%	29%	4.6–12.2°C
February	7%	29%	13%	33%	6.2–14.3°C
March	23%	30%	14%	37%	12.3–20.3°C
April	47%	31%	14%	37%	19.4–24.5°C
May	65%	29%	13%	34%	23.7–28.1°C
June	75%	25%	11%	26%	28.2–32.4°C
July	75%	25%	11%	24%	30.0–34.0°C
August	78%	22%	9%	22%	29.4–34.0°C
September	77%	21%	9%	19%	26.0–31.4°C
October	59%	20%	9%	18%	20.3–25.4°C
November	22%	25%	12%	25%	13.1–18.4°C
December	4%	27%	13%	30%	7.0–13.2°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.

1898Each stripe is one year’s mean temperature against the 109-year average. Warmest: 1921. Coolest: 1979.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4618921
NOAA station: USC00402589 · DOVER 1 W
Station distance: 0.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 36.49°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 DOVER 1 W is what differs

Fort Heiman→Ardee (historical)→Asbury→Atkins→Bear Spring→Big Rock→

Or put two places side by side: Dover vs Fort Heiman

Best time to visitDover.