United States · 1991–2020

Best time to visit
Dana.

September leads for comfortable weather in Dana: typically 26.7°C by day, 13.1°C at night, with 78 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.7°C

Typical low13.1°C

Rain in September78 mm

Comfort

September

September · May · August

79climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · April · September

78climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 2.5°C, 21° 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

52.5° / -6.5°

Feb

55.9° / -4.2°

Mar

2312° / 0.4°

Apr

4919.1° / 5.9°

May

7124.6° / 11.4°

Jun

6029.1° / 16.4°

Jul

5630.4° / 18.2°

Aug

6529.8° / 17.4°

Sep

7926.7° / 13.1°

Oct

5919.8° / 7°

Nov

2111.5° / 1.1°

Dec

54.8° / -3.9°

Monthly climate evidence for Dana — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.5°C	-6.5°C	84 mm	7.2	9 h 38	5	Strong coverage
February	5.9°C	-4.2°C	70 mm	5.9	10 h 38	5	Strong coverage
March	12°C	0.4°C	87 mm	7.6	11 h 49	23	Strong coverage
April	19.1°C	5.9°C	121 mm	9.9	13 h 12	49	Strong coverage
May	24.6°C	11.4°C	129 mm	11	14 h 21	71	Strong coverage
June	29.1°C	16.4°C	140 mm	9.7	14 h 58	60	Strong coverage
July	30.4°C	18.2°C	123 mm	8.1	14 h 44	56	Strong coverage
August	29.8°C	17.4°C	96 mm	6.9	13 h 44	65	Strong coverage
September	26.7°C	13.1°C	78 mm	5.7	12 h 24	79	Strong coverage
October	19.8°C	7°C	97 mm	7.9	11 h 05	59	Strong coverage
November	11.5°C	1.1°C	96 mm	7.6	9 h 56	21	Strong coverage
December	4.8°C	-3.9°C	77 mm	7.8	9 h 22	5	Strong coverage

What has changed

Dana runs +0.3°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

-0.4

Feb

+1.2

Mar

+0.4

Apr

-0.2

May

+1.1

Jun

+0.7

Jul

+0.1

Aug

+0.2

Sep

+1.2

Oct

+0.3

Nov

-1.3

Dec

+0.5

September daytime highs, 2011–2025. Last recorded: 28.7°C.

Records at ROCKVILLE, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C25 Jan 1950	-31.7°C19 Jan 1994	74 mm3 Jan 1950	278 mm1950 · driest 1 mm in 1986	131
February	23.3°C25 Feb 2000	-30.0°C13 Feb 1905	89 mm28 Feb 2011	254 mm2022 · driest 4 mm in 1947	131
March	31.7°C27 Mar 1967	-22.8°C8 Mar 1943	94 mm14 Mar 1922	231 mm1922 · driest 0 mm in 1910	132
April	33.3°C11 Apr 1930	-9.4°C8 Apr 2018	107 mm3 Apr 2018	265 mm2011 · driest 26 mm in 1900	132
May	36.1°C28 May 2018	-3.9°C9 May 2020	205 mm26 May 1989	341 mm1943 · driest 6 mm in 1979	130
June	40.6°C28 Jun 2012	1.1°C6 Jun 1894	222 mm28 Jun 1957	334 mm1957 · driest 5 mm in 1933	131
July	42.8°C14 Jul 1936	6.1°C10 Jul 1895	152 mm30 Jul 1990	325 mm1990 · driest 7 mm in 1974	132
August	41.1°C5 Aug 1918	3.9°C31 Aug 1915	120 mm12 Aug 1993	266 mm1993 · driest 6 mm in 2010	128
September	39.4°C5 Sep 1899	-3.9°C28 Sep 1942	139 mm1 Sep 2003	255 mm2018 · driest 3 mm in 1897	128
October	33.3°C4 Oct 1922	-7.8°C30 Oct 1895	96 mm18 Oct 1917	265 mm1919 · driest 5 mm in 1908	130
November	27.8°C1 Nov 1950	-20.6°C24 Nov 1950	105 mm12 Nov 1992	356 mm1985 · driest 5 mm in 1917	130
December	23.3°C2 Dec 1982	-30.0°C28 Dec 1924	140 mm21 Dec 1967	284 mm1967 · driest 10 mm in 1919	128

Typical days per month at ROCKVILLE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	3
February	0	0	22	2	2
March	1	0	15	3	<1
April	5	<1	5	4	<1
May	16	5	<1	4	0
June	26	14	0	4	0
July	29	18	0	4	0
August	29	16	0	3	0
September	20	8	<1	2	0
October	7	<1	4	3	0
November	<1	0	14	3	<1
December	0	0	23	3	2

How often, not how much — every day in ROCKVILLE’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%	7%	22%	-0.8–5.8°C
February	<1%	22%	7%	19%	0.8–8.4°C
March	10%	27%	10%	30%	7.0–15.1°C
April	29%	32%	12%	42%	14.9–21.1°C
May	55%	32%	12%	41%	21.3–26.6°C
June	70%	30%	13%	33%	26.2–31.0°C
July	76%	24%	11%	23%	28.6–33.2°C
August	78%	21%	9%	18%	28.1–31.7°C
September	72%	21%	9%	19%	24.0–28.6°C
October	43%	22%	8%	22%	17.3–22.5°C
November	8%	24%	9%	23%	8.2–14.2°C
December	<1%	24%	9%	26%	0.5–7.2°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.

1893Each stripe is one year’s mean temperature against the 121-year average. Warmest: 2012. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4256437
NOAA station: USC00127522 · ROCKVILLE
Station distance: 23.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 39.81°, 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 ROCKVILLE is what differs

Clinton→Rockville→Rockport→Fairview Park→Montezuma→Rosedale→

Or put two places side by side: Dana vs Clinton

Best time to visitDana.