United States · 1991–2020

Best time to visit
Wann.

September leads for comfortable weather in Wann: typically 25.7°C by day, 13°C at night, with 78 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.7°C

Typical low13°C

Rain in September78 mm

Comfort

September

September · May · August

82climate match

Beach

July

July · August · June

79climate match

Outdoors

October

October · May · September

76climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 0.2°C, 24° 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

50.2° / -9.8°

Feb

52.1° / -8.8°

Mar

2010.5° / -1.7°

Apr

4416.8° / 4.1°

May

6822.8° / 10.6°

Jun

6228.4° / 16.8°

Jul

6330.1° / 18.8°

Aug

6528.7° / 17.5°

Sep

8225.7° / 13°

Oct

5517.9° / 5.6°

Nov

2510.3° / -1.5°

Dec

52.3° / -7.5°

Monthly climate evidence for Wann — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.2°C	-9.8°C	21 mm	3.7	9 h 31	5	Good coverage
February	2.1°C	-8.8°C	33 mm	5.2	10 h 33	5	Good coverage
March	10.5°C	-1.7°C	48 mm	6.4	11 h 48	20	Good coverage
April	16.8°C	4.1°C	87 mm	8.5	13 h 15	44	Good coverage
May	22.8°C	10.6°C	127 mm	10.7	14 h 28	68	Good coverage
June	28.4°C	16.8°C	134 mm	9.4	15 h 07	62	Good coverage
July	30.1°C	18.8°C	80 mm	6.8	14 h 52	63	Good coverage
August	28.7°C	17.5°C	108 mm	8	13 h 49	65	Good coverage
September	25.7°C	13°C	78 mm	6.4	12 h 25	82	Good coverage
October	17.9°C	5.6°C	71 mm	6.5	11 h 02	55	Good coverage
November	10.3°C	-1.5°C	31 mm	3.6	9 h 49	25	Good coverage
December	2.3°C	-7.5°C	37 mm	4.5	9 h 13	5	Good coverage

Records at GRETNA, 2004–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C31 Jan 2012	-28.9°C14 Jan 2024	40 mm26 Jan 2021	56 mm2021 · driest 0 mm in 2025	22
February	26.1°C27 Feb 2024	-31.1°C16 Feb 2021	51 mm13 Feb 2005	89 mm2005 · driest 1 mm in 2020	22
March	35.6°C22 Mar 2026	-22.2°C5 Mar 2019	41 mm14 Mar 2021	119 mm2007 · driest 6 mm in 2014	21
April	32.2°C1 Apr 2012	-11.1°C5 Apr 2018	72 mm15 Apr 2012	134 mm2016 · driest 13 mm in 2018	21
May	36.7°C28 May 2018	-0.6°C4 May 2011	88 mm7 May 2015	210 mm2019 · driest 7 mm in 2023	21
June	38.3°C25 Jun 2024	7.2°C2 Jun 2022	110 mm21 Jun 2014	275 mm2010 · driest 41 mm in 2007	21
July	39.4°C23 Jul 2012	10.6°C15 Jul 2014	155 mm2 Jul 2024	233 mm2024 · driest 2 mm in 2012	22
August	40.0°C25 Aug 2023	7.8°C31 Aug 2009	94 mm12 Aug 2016	273 mm2016 · driest 24 mm in 2008	21
September	37.8°C21 Sep 2022	2.8°C30 Sep 2005	73 mm22 Sep 2004	176 mm2019 · driest 12 mm in 2024	21
October	34.4°C6 Oct 2024	-10.0°C31 Oct 2023	86 mm25 Oct 2021	183 mm2021 · driest 7 mm in 2010	21
November	27.2°C9 Nov 2006	-16.7°C12 Nov 2019	28 mm12 Nov 2010	113 mm2024 · driest 2 mm in 2007	22
December	22.2°C16 Dec 2021	-26.7°C23 Dec 2022	65 mm14 Dec 2015	144 mm2015 · driest 5 mm in 2013	22

Typical days per month at GRETNA, 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	6
March	2	<1	20	2	3
April	4	<1	7	3	1
May	13	4	<1	4	<1
June	25	12	0	4	0
July	29	17	0	2	0
August	27	12	0	4	0
September	18	7	0	3	0
October	5	<1	5	2	<1
November	<1	0	18	<1	1
December	0	0	29	1	5

How often, not how much — every day in GRETNA’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%	12%	2%	6%	-3.0–3.1°C
February	2%	17%	3%	14%	-2.0–8.5°C
March	14%	20%	6%	20%	7.3–14.4°C
April	28%	27%	9%	33%	13.7–19.8°C
May	48%	33%	12%	43%	20.9–25.0°C
June	69%	31%	13%	41%	27.3–29.9°C
July	77%	23%	9%	21%	28.1–31.9°C
August	73%	26%	11%	26%	27.2–30.3°C
September	73%	20%	7%	17%	23.7–27.8°C
October	38%	20%	7%	20%	15.2–20.6°C
November	9%	13%	3%	8%	7.7–12.3°C
December	0%	15%	3%	10%	-0.3–6.0°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.

2005Each stripe is one year’s mean temperature against the 20-year average. Warmest: 2012. Coolest: 2008.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5081347
NOAA station: USC00253467 · GRETNA
Station distance: 9.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 41.15°, 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 GRETNA is what differs

Chalco→Gretna→Springfield→Lane→Melia→Millard→

Or put two places side by side: Wann vs Chalco

Best time to visitWann.