United States · 1991–2020

Best time to visit
Mount Vernon.

May leads for comfortable weather in Mount Vernon: typically 25.1°C by day, 13°C at night, with 109 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high25.1°C

Typical low13°C

Rain in May109 mm

Comfort

May

May · September · October

78climate match

Beach

August

August · July · June

73climate match

Outdoors

October

October · April · May

78climate match

The weakest month is January, scoring 5 against May’s 78 — days reach only 9.7°C, 14° 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

59.7° / -0.6°

Feb

1512° / 1°

Mar

3916.8° / 5.2°

Apr

5921.2° / 8.6°

May

7825.1° / 13°

Jun

6429.4° / 17.4°

Jul

5630.3° / 19.3°

Aug

5830.3° / 19°

Sep

7527.7° / 15.7°

Oct

7222° / 9.3°

Nov

3915.9° / 3.2°

Dec

1011.6° / 1.4°

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	9.7°C	-0.6°C	134 mm	8.9	10 h 06	5	Good coverage
February	12°C	1°C	135 mm	10.1	10 h 54	15	Good coverage
March	16.8°C	5.2°C	129 mm	9.5	11 h 52	39	Good coverage
April	21.2°C	8.6°C	147 mm	8.3	13 h	59	Good coverage
May	25.1°C	13°C	109 mm	7.7	13 h 56	78	Good coverage
June	29.4°C	17.4°C	100 mm	8.5	14 h 26	64	Good coverage
July	30.3°C	19.3°C	114 mm	8.4	14 h 14	56	Good coverage
August	30.3°C	19°C	102 mm	8.1	13 h 26	58	Good coverage
September	27.7°C	15.7°C	100 mm	5.6	12 h 21	75	Good coverage
October	22°C	9.3°C	93 mm	6.8	11 h 16	72	Good coverage
November	15.9°C	3.2°C	104 mm	7.3	10 h 20	39	Good coverage
December	11.6°C	1.4°C	164 mm	9.9	9 h 52	10	Good coverage

Records at GADSDEN 19 N, 2005–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.1°C1 Jan 2022	-16.0°C7 Jan 2014	90 mm6 Jan 2009	267 mm2013 · driest 32 mm in 2018	21
February	25.7°C22 Feb 2023	-13.6°C19 Feb 2015	87 mm6 Feb 2020	311 mm2022 · driest 52 mm in 2007	21
March	28.1°C15 Mar 2016	-8.3°C3 Mar 2009	107 mm25 Mar 2021	343 mm2021 · driest 0 mm in 2023	21
April	29.1°C30 Apr 2012	-4.4°C8 Apr 2007	142 mm12 Apr 2020	240 mm2020 · driest 0 mm in 2023	22
May	32.5°C26 May 2012	0.9°C5 May 2011	69 mm4 May 2021	417 mm2025 · driest 15 mm in 2007	22
June	38.6°C30 Jun 2012	8.1°C2 Jun 2012	154 mm19 Jun 2021	267 mm2021 · driest 2 mm in 2023	22
July	38.9°C1 Jul 2012	9.6°C30 Jul 2014	85 mm19 Jul 2022	244 mm2013 · driest 21 mm in 2010	22
August	37.8°C16 Aug 2007	9.0°C27 Aug 2025	89 mm26 Aug 2008	272 mm2021 · driest 40 mm in 2025	21
September	35.7°C21 Sep 2010	5.0°C29 Sep 2006	223 mm5 Sep 2011	297 mm2011 · driest 1 mm in 2023	21
October	35.4°C3 Oct 2019	-4.2°C26 Oct 2013	79 mm8 Oct 2017	220 mm2019 · driest 0 mm in 2016	21
November	29.2°C1 Nov 2016	-10.8°C22 Nov 2008	76 mm30 Nov 2016	181 mm2018 · driest 5 mm in 2023	21
December	23.6°C10 Dec 2007	-14.9°C23 Dec 2022	112 mm25 Dec 2015	305 mm2015 · driest 39 mm in 2023	21

Typical days per month at GADSDEN 19 N, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	18	4
February	<1	0	14	4
March	1	0	6	5
April	6	0	<1	4
May	19	2	0	3
June	28	13	0	3
July	30	18	0	4
August	30	18	0	3
September	24	8	0	3
October	10	<1	1	3
November	<1	0	10	3
December	0	0	14	4

How often, not how much — every day in GADSDEN 19 N’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	2%	32%	13%	34%	6.9–13.3°C
February	8%	38%	16%	45%	9.9–15.7°C
March	26%	29%	16%	34%	15.2–20.1°C
April	50%	27%	13%	31%	19.6–23.3°C
May	65%	28%	13%	33%	23.2–26.9°C
June	71%	29%	11%	33%	27.7–30.8°C
July	70%	31%	13%	34%	28.3–31.9°C
August	71%	28%	11%	32%	28.8–32.7°C
September	80%	19%	9%	19%	25.9–30.8°C
October	56%	22%	8%	23%	20.0–24.3°C
November	18%	25%	9%	29%	14.1–17.8°C
December	5%	32%	14%	41%	8.8–13.4°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.

2006Each stripe is one year’s mean temperature against the 20-year average. Warmest: 2016. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4078346
NOAA station: USW00063857 · GADSDEN 19 N
Station distance: 16 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 34.29°, 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 GADSDEN 19 N is what differs

Collinsville→Tabor→Black Creek→Chumley (historical)→Clyde (historical)→Copeland Bridge→

Or put two places side by side: Mount Vernon vs Collinsville

Best time to visitMount Vernon.

May

August

October

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Mount Vernon.

The whole year,
without the guesswork.

Nearby, measured,
and named.