United States · 1991–2020

Best time to visit
Opal.

September leads for comfortable weather in Opal: typically 25.5°C by day, 13.6°C at night, with 121 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.5°C

Typical low13.6°C

Rain in September121 mm

Comfort

September

September · May · June

76climate match

Beach

August

August · July · June

79climate match

Outdoors

October

October · April · May

82climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 5.8°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

55.8° / -4.5°

Feb

77.6° / -3.2°

Mar

2412.6° / 0.9°

Apr

5619° / 6.3°

May

7523.2° / 11.3°

Jun

7427.3° / 16.1°

Jul

6329.5° / 18.5°

Aug

7128.8° / 17.5°

Sep

7625.5° / 13.6°

Oct

6219.5° / 6.9°

Nov

3413.6° / 2.4°

Dec

57.8° / -2°

Monthly climate evidence for Opal — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.8°C	-4.5°C	79 mm	7.5	9 h 44	5	Good coverage
February	7.6°C	-3.2°C	55 mm	6.4	10 h 41	7	Good coverage
March	12.6°C	0.9°C	93 mm	7.9	11 h 50	24	Good coverage
April	19°C	6.3°C	84 mm	8.1	13 h 09	56	Good coverage
May	23.2°C	11.3°C	110 mm	8.9	14 h 15	75	Good coverage
June	27.3°C	16.1°C	94 mm	8.6	14 h 51	74	Good coverage
July	29.5°C	18.5°C	90 mm	8.2	14 h 37	63	Good coverage
August	28.8°C	17.5°C	76 mm	6.6	13 h 40	71	Good coverage
September	25.5°C	13.6°C	121 mm	7.6	12 h 23	76	Good coverage
October	19.5°C	6.9°C	81 mm	5.9	11 h 07	62	Good coverage
November	13.6°C	2.4°C	78 mm	6.3	10 h 01	34	Good coverage
December	7.8°C	-2°C	96 mm	7.7	9 h 29	5	Good coverage

Records at WARRENTON 3 SE, 1897–2016
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C1 Jan 1993	-23.9°C16 Jan 1972	82 mm9 Jan 1978	202 mm1978 · driest 7 mm in 1981	63
February	26.7°C25 Feb 1985	-22.8°C10 Feb 1899	60 mm8 Feb 1965	195 mm1899 · driest 4 mm in 2008	63
March	32.2°C14 Mar 1990	-15.6°C4 Mar 2014	75 mm29 Mar 1984	216 mm1993 · driest 2 mm in 2006	65
April	34.4°C19 Apr 1976	-9.4°C9 Apr 1977	69 mm29 Apr 1964	248 mm1983 · driest 17 mm in 1985	66
May	35.0°C30 May 1969	-1.1°C4 May 1986	97 mm6 May 1989	280 mm1989 · driest 27 mm in 1969	66
June	37.2°C22 Jun 1988	3.9°C11 Jun 1972	225 mm22 Jun 1972	345 mm1972 · driest 16 mm in 2006	66
July	39.4°C7 Jul 1977	8.9°C1 Jul 1988	176 mm21 Jul 1956	413 mm1956 · driest 15 mm in 2009	64
August	40.0°C18 Aug 1988	6.1°C22 Aug 1993	113 mm13 Aug 1955	258 mm1994 · driest 19 mm in 2006	63
September	38.9°C1 Sep 1953	-2.8°C30 Sep 1993	81 mm6 Sep 1979	241 mm1975 · driest 11 mm in 1967	61
October	34.4°C5 Oct 1951	-8.9°C24 Oct 1993	103 mm9 Oct 1976	309 mm1976 · driest 1 mm in 2000	63
November	30.0°C2 Nov 1974	-13.3°C29 Nov 1955	111 mm28 Nov 1993	186 mm1952 · driest 11 mm in 2000	64
December	26.1°C30 Dec 1984	-18.9°C26 Dec 1983	79 mm2 Dec 1974	173 mm1983 · driest 6 mm in 1955	61

Typical days per month at WARRENTON 3 SE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	22	3	2
February	0	0	20	2	2
March	1	<1	14	3	1
April	5	<1	2	3	<1
May	11	3	0	4	0
June	20	8	0	3	0
July	26	14	0	3	0
August	25	11	0	3	0
September	16	5	<1	4	0
October	4	<1	2	3	0
November	<1	0	10	2	<1
December	<1	0	20	3	1

How often, not how much — every day in WARRENTON 3 SE’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%	9%	27%	2.7–8.8°C
February	3%	26%	9%	25%	3.5–10.4°C
March	11%	28%	10%	30%	9.7–14.7°C
April	32%	28%	10%	31%	16.4–21.0°C
May	56%	31%	12%	37%	21.4–25.5°C
June	70%	28%	11%	30%	25.9–29.2°C
July	71%	28%	10%	29%	28.2–32.0°C
August	74%	25%	10%	25%	27.7–30.9°C
September	72%	24%	10%	23%	24.2–28.4°C
October	43%	21%	9%	19%	17.9–22.2°C
November	13%	25%	10%	22%	11.1–15.9°C
December	2%	24%	9%	24%	4.1–11.0°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 54-year average. Warmest: 1998. Coolest: 1993.2015

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4777424
NOAA station: USC00448888 · WARRENTON 3 SE
Station distance: 7.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 38.62°, 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 WARRENTON 3 SE is what differs

Warrenton→New Baltimore→Bealeton→Marshall→Remington→Catlett→

Or put two places side by side: Opal vs Warrenton

Best time to visitOpal.