United States · 1991–2020

Best time to visit
Olney.

September leads for comfortable weather in Olney: typically 27.2°C by day, 13.6°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.2°C

Typical low13.6°C

Rain in September84 mm

Comfort

September

September · May · August

77climate match

Beach

August

August · June · July

77climate match

Outdoors

October

October · April · September

79climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only 3.6°C, 20° 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

53.6° / -5.7°

Feb

56.5° / -3.8°

Mar

2012.3° / 0.8°

Apr

4819.1° / 6.4°

May

7224.4° / 12.3°

Jun

6129.2° / 17.1°

Jul

5330.8° / 19°

Aug

6530.2° / 17.9°

Sep

7727.2° / 13.6°

Oct

6320.6° / 7.3°

Nov

2112.4° / 1.3°

Dec

56° / -3.1°

Monthly climate evidence for Olney — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.6°C	-5.7°C	97 mm	8.2	9 h 44	5	Strong coverage
February	6.5°C	-3.8°C	64 mm	6.5	10 h 41	5	Strong coverage
March	12.3°C	0.8°C	107 mm	9.1	11 h 50	20	Strong coverage
April	19.1°C	6.4°C	132 mm	9.9	13 h 09	48	Strong coverage
May	24.4°C	12.3°C	141 mm	10.8	14 h 16	72	Strong coverage
June	29.2°C	17.1°C	122 mm	9	14 h 52	61	Strong coverage
July	30.8°C	19°C	129 mm	7.9	14 h 37	53	Strong coverage
August	30.2°C	17.9°C	77 mm	6.3	13 h 40	65	Strong coverage
September	27.2°C	13.6°C	84 mm	6	12 h 23	77	Strong coverage
October	20.6°C	7.3°C	94 mm	7	11 h 07	63	Strong coverage
November	12.4°C	1.3°C	115 mm	8.4	10 h 01	21	Strong coverage
December	6°C	-3.1°C	90 mm	8.4	9 h 28	5	Strong coverage

What has changed

Olney 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

+0.4

Feb

+0.5

Mar

+0.4

Apr

-0.6

May

-0.2

Jun

-0.2

Jul

-0.5

Aug

-0.9

Sep

+0.2

Oct

+0.1

Nov

-0.5

Dec

+1.8

September daytime highs, 2011–2025. Last recorded: 28.9°C.

Records at OLNEY 2S, 1896–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C24 Jan 1943	-31.1°C19 Jan 1994	81 mm1 Jan 1948	306 mm1950 · driest 3 mm in 1986	128
February	25.6°C29 Feb 1972	-31.7°C2 Feb 1951	65 mm9 Feb 1965	179 mm1950 · driest 1 mm in 1947	128
March	31.7°C24 Mar 1929	-26.1°C5 Mar 1978	160 mm25 Mar 1904	323 mm2008 · driest 7 mm in 1910	129
April	32.8°C11 Apr 1930	-6.1°C7 Apr 1994	95 mm19 Apr 1959	338 mm2011 · driest 25 mm in 1899	126
May	36.7°C27 May 1911	-1.7°C4 May 1976	136 mm7 May 1961	325 mm1943 · driest 20 mm in 1914	125
June	41.1°C28 Jun 1944	2.2°C16 Jun 1917	113 mm18 Jun 1911	282 mm2015 · driest 12 mm in 1978	128
July	44.4°C15 Jul 1936	7.2°C1 Jul 1937	116 mm10 Jul 1933	298 mm1958 · driest 6 mm in 1901	127
August	42.8°C26 Aug 1943	5.0°C31 Aug 1915	105 mm3 Aug 1924	284 mm2000 · driest 2 mm in 2011	125
September	41.1°C5 Sep 1925	-2.8°C30 Sep 1899	163 mm3 Sep 1926	311 mm1911 · driest 1 mm in 1963	126
October	36.1°C2 Oct 1953	-8.3°C29 Oct 1952	117 mm18 Oct 1905	313 mm1919 · driest 1 mm in 2024	125
November	28.3°C1 Nov 1933	-18.9°C30 Nov 1929	136 mm14 Nov 1993	310 mm1985 · driest 5 mm in 1949	128
December	23.3°C2 Dec 1982	-28.3°C22 Dec 1989	100 mm3 Dec 1982	254 mm1982 · driest 12 mm in 1896	128

Typical days per month at OLNEY 2S, 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	21	2	2
March	1	0	15	4	<1
April	6	<1	4	4	0
May	16	4	<1	4	0
June	27	14	0	4	0
July	30	20	0	4	0
August	30	18	0	3	0
September	22	9	0	2	0
October	8	2	3	3	0
November	<1	0	14	4	<1
December	0	0	22	3	2

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 82); on 2011–2025 it is May (83). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in OLNEY 2S’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%	25%	0.6–7.8°C
February	2%	24%	8%	25%	2.2–10.3°C
March	12%	29%	12%	35%	9.0–16.3°C
April	33%	32%	12%	39%	16.6–21.7°C
May	60%	30%	12%	37%	22.3–27.2°C
June	72%	27%	12%	30%	27.3–31.6°C
July	77%	23%	11%	22%	29.8–33.8°C
August	79%	21%	9%	19%	28.8–33.3°C
September	76%	21%	9%	18%	25.3–30.1°C
October	51%	20%	8%	19%	18.7–24.0°C
November	12%	24%	11%	24%	9.9–15.5°C
December	<1%	25%	10%	28%	2.7–9.4°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.

1897Each stripe is one year’s mean temperature against the 110-year average. Warmest: 1931. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4246382
NOAA station: USC00116446 · OLNEY 2S
Station distance: 3.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 38.73°, 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 OLNEY 2S is what differs

Noble→Parkersburg→Claremont→Calhoun→Amity→Berryville→

Or put two places side by side: Olney vs Noble

Best time to visitOlney.