United States · 1991–2020

Best time to visit
Defiance.

September leads for comfortable weather in Defiance: typically 24.7°C by day, 10.7°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.7°C

Typical low10.7°C

Rain in September83 mm

Comfort

September

September · June · August

80climate match

Beach

July

July · August · June

74climate match

Outdoors

October

October · September · May

76climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only -1.4°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

5-1.4° / -11.8°

Feb

51.3° / -9.4°

Mar

149.2° / -3.3°

Apr

4116.7° / 2.9°

May

6822.7° / 9.7°

Jun

6927.6° / 15.4°

Jul

6629.1° / 17.5°

Aug

6928.2° / 16.2°

Sep

8024.7° / 10.7°

Oct

5417.9° / 4.3°

Nov

158.5° / -3°

Dec

51.1° / -8.8°

Monthly climate evidence for Defiance — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-1.4°C	-11.8°C	22 mm	4.2	9 h 27	5	Strong coverage
February	1.3°C	-9.4°C	27 mm	4.2	10 h 31	5	Strong coverage
March	9.2°C	-3.3°C	49 mm	5.6	11 h 48	14	Strong coverage
April	16.7°C	2.9°C	94 mm	8.7	13 h 17	41	Strong coverage
May	22.7°C	9.7°C	122 mm	10.1	14 h 31	68	Strong coverage
June	27.6°C	15.4°C	130 mm	9.1	15 h 12	69	Strong coverage
July	29.1°C	17.5°C	97 mm	7.7	14 h 56	66	Strong coverage
August	28.2°C	16.2°C	115 mm	7.6	13 h 52	69	Strong coverage
September	24.7°C	10.7°C	83 mm	6.2	12 h 26	80	Good coverage
October	17.9°C	4.3°C	61 mm	6.1	11 h 00	54	Good coverage
November	8.5°C	-3°C	36 mm	4.4	9 h 46	15	Good coverage
December	1.1°C	-8.8°C	32 mm	4.7	9 h 09	5	Strong coverage

Records at HARLAN, 1899–2016
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C25 Jan 1944	-38.3°C12 Jan 1912	34 mm28 Jan 1909	73 mm1949 · driest 0 mm in 1928	117
February	21.7°C24 Feb 1930	-38.3°C13 Feb 1905	40 mm19 Feb 1954	75 mm2012 · driest 0 mm in 1922	116
March	32.2°C25 Mar 1907	-30.6°C5 Mar 1960	74 mm28 Mar 2004	151 mm2004 · driest 0 mm in 1910	116
April	34.4°C28 Apr 1910	-16.7°C3 Apr 1975	76 mm19 Apr 1920	198 mm1986 · driest 2 mm in 1926	117
May	41.1°C30 May 1934	-7.8°C2 May 1908	136 mm21 May 1962	326 mm1962 · driest 13 mm in 1926	117
June	41.7°C10 Jun 1933	-0.6°C3 Jun 1969	104 mm30 Jun 2014	312 mm1967 · driest 4 mm in 1933	116
July	45.6°C25 Jul 1936	4.4°C5 Jul 1972	171 mm2 Jul 1958	346 mm1958 · driest 1 mm in 2012	116
August	43.9°C5 Aug 1934	1.7°C31 Aug 1967	131 mm29 Aug 1952	308 mm2014 · driest 5 mm in 2003	116
September	41.1°C3 Sep 2000	-6.7°C29 Sep 1899	199 mm11 Sep 1972	415 mm1972 · driest 5 mm in 1950	115
October	34.4°C2 Oct 1953	-17.8°C28 Oct 1925	94 mm11 Oct 1986	174 mm1918 · driest 0 mm in 1952	116
November	26.7°C3 Nov 2005	-26.7°C21 Nov 1937	104 mm13 Nov 1909	250 mm1909 · driest 0 mm in 1949	116
December	20.0°C6 Dec 1939	-32.8°C10 Dec 1919	55 mm14 Dec 2015	156 mm2015 · driest 0 mm in 1924	117

Typical days per month at HARLAN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	5
February	0	0	27	<1	5
March	<1	0	23	2	2
April	4	1	9	4	<1
May	12	4	<1	4	<1
June	23	10	0	4	0
July	28	13	0	3	0
August	26	10	0	4	0
September	16	5	<1	3	0
October	5	<1	8	2	<1
November	<1	0	22	1	2
December	0	0	29	<1	4

How often, not how much — every day in HARLAN’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	0%	13%	2%	7%	-5.9–3.5°C
February	<1%	14%	3%	9%	-2.4–5.6°C
March	8%	18%	4%	16%	4.1–12.6°C
April	28%	26%	9%	31%	13.7–19.6°C
May	52%	30%	11%	36%	20.4–25.7°C
June	69%	29%	13%	35%	25.3–30.4°C
July	76%	24%	9%	22%	27.9–32.7°C
August	75%	24%	10%	24%	26.4–31.5°C
September	66%	23%	10%	24%	22.1–27.3°C
October	39%	18%	6%	16%	15.6–21.0°C
November	5%	14%	4%	10%	5.5–11.8°C
December	0%	13%	2%	8%	-2.8–4.7°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.

1900Each stripe is one year’s mean temperature against the 111-year average. Warmest: 1931. Coolest: 1912.2014

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4831806
NOAA station: USC00133632 · HARLAN
Station distance: 19.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 41.82°, 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 HARLAN is what differs

Harlan→Avoca→Shelby→Earling→Irwin→Persia→

Or put two places side by side: Defiance vs Harlan

Best time to visitDefiance.