United States · 1991–2020

Best time to visit
Harvey.

September leads for comfortable weather in Harvey: typically 24.8°C by day, 12.6°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.8°C

Typical low12.6°C

Rain in September86 mm

Comfort

September

September · August · May

83climate match

Beach

July

July · August · June

76climate match

Outdoors

October

October · May · September

75climate match

The weakest month is January, scoring 5 against September’s 83 — days reach only -0.7°C, 25° 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

5-0.7° / -10.4°

Feb

52.1° / -8°

Mar

149.1° / -2.1°

Apr

4016.3° / 4.5°

May

6722° / 11°

Jun

6427.4° / 16.6°

Jul

6229.6° / 18.9°

Aug

6828.4° / 17.4°

Sep

8324.8° / 12.6°

Oct

5417.6° / 5.9°

Nov

199.3° / -1.1°

Dec

52.2° / -7.2°

Monthly climate evidence for Harvey — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.7°C	-10.4°C	26 mm	3.5	9 h 30	5	Strong coverage
February	2.1°C	-8°C	38 mm	4.2	10 h 33	5	Strong coverage
March	9.1°C	-2.1°C	53 mm	6.4	11 h 48	14	Strong coverage
April	16.3°C	4.5°C	107 mm	8.7	13 h 15	40	Strong coverage
May	22°C	11°C	122 mm	10.2	14 h 29	67	Strong coverage
June	27.4°C	16.6°C	146 mm	9.8	15 h 08	64	Strong coverage
July	29.6°C	18.9°C	102 mm	6.6	14 h 53	62	Strong coverage
August	28.4°C	17.4°C	100 mm	7.4	13 h 50	68	Strong coverage
September	24.8°C	12.6°C	86 mm	6.3	12 h 25	83	Strong coverage
October	17.6°C	5.9°C	71 mm	6.4	11 h 01	54	Strong coverage
November	9.3°C	-1.1°C	51 mm	5.1	9 h 48	19	Strong coverage
December	2.2°C	-7.2°C	30 mm	3.5	9 h 12	5	Strong coverage

What has changed

Harvey runs -0.5°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

+0.2

Feb

-1.3

Mar

-0.1

Apr

-1.6

May

-1.6

Jun

-0.5

Jul

-1.0

Aug

-1.1

Sep

+0.6

Oct

-1.3

Nov

-0.2

Dec

+1.7

September daytime highs, 2011–2022. Last recorded: 25.6°C.

Records at KNOXVILLE, 1893–2023
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C31 Jan 1989	-34.4°C12 Jan 1912	61 mm12 Jan 1960	162 mm2003 · driest 0 mm in 1899	127
February	25.6°C24 Feb 1930	-33.9°C3 Feb 1996	108 mm24 Feb 2001	222 mm2001 · driest 0 mm in 2008	125
March	31.7°C29 Mar 1986	-28.3°C5 Mar 1960	47 mm16 Mar 1919	139 mm1961 · driest 0 mm in 1994	127
April	33.3°C10 Apr 1930	-12.8°C3 Apr 1975	106 mm18 Apr 2013	255 mm1991 · driest 13 mm in 1988	124
May	41.1°C30 May 1934	-3.9°C4 May 1907	100 mm7 May 2007	271 mm1996 · driest 15 mm in 1980	121
June	40.6°C26 Jun 1934	1.7°C3 Jun 1946	139 mm10 Jun 2011	351 mm2010 · driest 8 mm in 1992	125
July	45.0°C19 Jul 1934	7.2°C30 Jul 1971	112 mm29 Jul 2015	345 mm1958 · driest 0 mm in 1894	127
August	45.6°C8 Aug 1934	4.4°C25 Aug 1934	97 mm15 Aug 1908	271 mm1975 · driest 13 mm in 1901	128
September	40.0°C7 Sep 1939	-3.9°C29 Sep 1899	142 mm14 Sep 1914	364 mm1914 · driest 0 mm in 2009	128
October	36.1°C4 Oct 1938	-16.7°C30 Oct 1925	108 mm9 Oct 2018	231 mm2018 · driest 0 mm in 1999	125
November	28.3°C1 Nov 1938	-20.6°C30 Nov 1964	154 mm17 Nov 1952	223 mm1983 · driest 0 mm in 1997	122
December	23.3°C16 Dec 2021	-32.2°C28 Dec 1924	48 mm14 Dec 2015	135 mm2015 · driest 0 mm in 1997	126

Typical days per month at KNOXVILLE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	<1	4
February	0	0	23	1	3
March	<1	0	19	2	2
April	3	<1	6	3	<1
May	9	2	<1	4	<1
June	21	9	0	5	0
July	26	13	0	3	0
August	24	10	0	3	0
September	15	5	<1	3	0
October	4	<1	4	2	<1
November	<1	0	16	2	<1
December	0	0	25	1	3

How often, not how much — every day in KNOXVILLE’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%	15%	3%	9%	-5.0–3.9°C
February	<1%	17%	3%	12%	-2.6–6.3°C
March	8%	21%	6%	19%	5.0–13.0°C
April	28%	27%	10%	33%	14.0–19.7°C
May	54%	30%	11%	37%	20.4–25.8°C
June	69%	30%	13%	34%	26.0–30.1°C
July	78%	22%	10%	21%	28.3–33.3°C
August	76%	23%	11%	22%	27.2–31.9°C
September	67%	23%	10%	23%	23.0–27.8°C
October	40%	20%	7%	18%	15.7–21.8°C
November	7%	17%	5%	13%	6.1–12.6°C
December	<1%	15%	3%	11%	-1.6–5.8°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.

1895Each stripe is one year’s mean temperature against the 109-year average. Warmest: 1931. Coolest: 2008.2022

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4860000
NOAA station: USC00134502 · KNOXVILLE
Station distance: 14.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 41.32°, 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 KNOXVILLE is what differs

Pella→Knoxville→Pleasantville→Melcher-Dallas→Attica→Caloma→

Or put two places side by side: Harvey vs Pella

Best time to visitHarvey.