United States · 1991–2020

Best time to visit
Mount Vernon.

September leads for comfortable weather in Mount Vernon: typically 27.5°C by day, 15.3°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.5°C

Typical low15.3°C

Rain in September81 mm

Comfort

September

September · May · October

79climate match

Beach

August

August · July · June

80climate match

Outdoors

October

October · April · September

83climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 5.2°C, 19° 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

55.2° / -3.9°

Feb

77.7° / -2.4°

Mar

2513° / 2.3°

Apr

5319.4° / 7.8°

May

7724.8° / 14°

Jun

6029.4° / 18.9°

Jul

5330.9° / 20.6°

Aug

6230.5° / 19.4°

Sep

7927.5° / 15.3°

Oct

6921° / 8.8°

Nov

3113.6° / 3°

Dec

57.8° / -1.2°

Monthly climate evidence for Mount Vernon — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.2°C	-3.9°C	88 mm	7.3	9 h 48	5	Strong coverage
February	7.7°C	-2.4°C	71 mm	6.5	10 h 43	7	Strong coverage
March	13°C	2.3°C	110 mm	8.7	11 h 50	25	Strong coverage
April	19.4°C	7.8°C	129 mm	9.2	13 h 07	53	Strong coverage
May	24.8°C	14°C	127 mm	9.6	14 h 12	77	Strong coverage
June	29.4°C	18.9°C	111 mm	8	14 h 47	60	Strong coverage
July	30.9°C	20.6°C	108 mm	7.3	14 h 33	53	Strong coverage
August	30.5°C	19.4°C	82 mm	5.7	13 h 38	62	Strong coverage
September	27.5°C	15.3°C	81 mm	5.7	12 h 23	79	Strong coverage
October	21°C	8.8°C	83 mm	6.4	11 h 09	69	Strong coverage
November	13.6°C	3°C	97 mm	7.4	10 h 04	31	Strong coverage
December	7.8°C	-1.2°C	95 mm	8.3	9 h 33	5	Strong coverage

What has changed

Mount Vernon runs +0.7°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

+2.0

Mar

+1.1

Apr

+0.3

May

+0.1

Jun

0.0

Jul

-0.2

Aug

-0.4

Sep

+0.3

Oct

+0.6

Nov

-0.1

Dec

+2.7

September daytime highs, 2011–2025. Last recorded: 28.3°C.

Records at MT VERNON, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.8°C24 Jan 1943	-29.4°C7 Jan 1912	130 mm21 Jan 1959	444 mm1937 · driest 8 mm in 1943	130
February	25.6°C24 Feb 1982	-28.3°C13 Feb 1899	84 mm19 Feb 1914	193 mm1908 · driest 3 mm in 2026	131
March	32.2°C24 Mar 1929	-19.4°C5 Mar 1978	160 mm19 Mar 2008	322 mm1964 · driest 4 mm in 1910	131
April	32.8°C28 Apr 1906	-6.1°C1 Apr 1923	188 mm29 Apr 1996	307 mm2011 · driest 7 mm in 1915	129
May	36.7°C21 May 1908	-0.6°C10 May 1966	123 mm8 May 1961	350 mm1961 · driest 10 mm in 1913	131
June	41.1°C29 Jun 2012	4.4°C18 Jun 1899	95 mm17 Jun 2000	227 mm1985 · driest 9 mm in 2012	129
July	42.8°C24 Jul 1901	10.0°C27 Jul 1962	110 mm11 Jul 1909	270 mm1905 · driest 10 mm in 2002	131
August	40.0°C8 Aug 2001	6.7°C29 Aug 1965	100 mm11 Aug 1948	285 mm2005 · driest 3 mm in 1976	128
September	41.7°C2 Sep 1953	-1.7°C30 Sep 1899	185 mm25 Sep 1945	276 mm1945 · driest 0 mm in 2004	127
October	35.6°C2 Oct 1953	-5.6°C29 Oct 1925	111 mm6 Oct 1910	267 mm1910 · driest 0 mm in 1903	130
November	28.9°C2 Nov 2016	-18.3°C25 Nov 1950	81 mm15 Nov 2005	232 mm1900 · driest 6 mm in 2023	132
December	25.0°C3 Dec 1982	-26.7°C22 Dec 1989	115 mm22 Dec 2013	276 mm1982 · driest 10 mm in 1955	130

Typical days per month at MT VERNON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	22	3	1
February	0	0	19	2	1
March	1	0	11	4	<1
April	5	<1	2	4	0
May	17	4	0	4	0
June	26	15	0	4	0
July	29	21	0	3	0
August	29	19	0	3	0
September	22	10	0	3	0
October	8	1	1	3	0
November	<1	0	9	3	<1
December	0	0	18	3	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 82); 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 MT VERNON’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%	26%	10%	28%	1.8–9.4°C
February	2%	26%	10%	29%	3.4–11.2°C
March	13%	31%	12%	36%	9.1–17.2°C
April	35%	31%	12%	38%	16.6–22.2°C
May	61%	30%	12%	36%	22.4–27.7°C
June	73%	27%	12%	29%	27.4–31.8°C
July	77%	24%	10%	21%	29.7–33.7°C
August	80%	20%	8%	18%	28.8–32.9°C
September	77%	20%	9%	18%	25.6–30.0°C
October	52%	20%	8%	20%	18.9–23.6°C
November	14%	25%	10%	26%	10.3–16.3°C
December	<1%	27%	10%	31%	4.1–10.2°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.

1896Each stripe is one year’s mean temperature against the 111-year average. Warmest: 1921. Coolest: 1917.2024

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4261837
NOAA station: USC00126001 · MT VERNON
Station distance: 0.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 37.93°, 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 MT VERNON is what differs

Rising Sun→Blairsville→Bufkin→Caborn→Dead Mans Crossing→Erwin→

Or put two places side by side: Mount Vernon vs Rising Sun

Best time to visitMount Vernon.