United States · 1991–2020

Best time to visit
South Vienna.

September leads for comfortable weather in South Vienna: typically 24.8°C by day, 11.1°C at night, with 71 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.8°C

Typical low11.1°C

Rain in September71 mm

Comfort

September

September · August · June

83climate match

Beach

August

August · July · June

70climate match

Outdoors

October

October · September · May

76climate match

The weakest month is January, scoring 5 against September’s 83 — days reach only 1.1°C, 23° 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

51.1° / -8°

Feb

53.5° / -6.4°

Mar

89.1° / -2.5°

Apr

3816.4° / 3.1°

May

6822.3° / 9.8°

Jun

7426.8° / 15.1°

Jul

6428.7° / 17°

Aug

7927.6° / 15.3°

Sep

8324.8° / 11.1°

Oct

5518.4° / 4.7°

Nov

1710.2° / -0.5°

Dec

54.8° / -3.9°

Monthly climate evidence for South Vienna — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.1°C	-8°C	69 mm	7.3	9 h 37	5	Good coverage
February	3.5°C	-6.4°C	60 mm	6.8	10 h 37	5	Good coverage
March	9.1°C	-2.5°C	80 mm	8.4	11 h 49	8	Good coverage
April	16.4°C	3.1°C	106 mm	9.4	13 h 12	38	Good coverage
May	22.3°C	9.8°C	113 mm	9.7	14 h 21	68	Good coverage
June	26.8°C	15.1°C	112 mm	9.5	14 h 59	74	Good coverage
July	28.7°C	17°C	122 mm	8.6	14 h 44	64	Good coverage
August	27.6°C	15.3°C	71 mm	6.5	13 h 44	79	Good coverage
September	24.8°C	11.1°C	71 mm	6.2	12 h 24	83	Good coverage
October	18.4°C	4.7°C	66 mm	6.6	11 h 04	55	Good coverage
November	10.2°C	-0.5°C	76 mm	6.8	9 h 55	17	Good coverage
December	4.8°C	-3.9°C	75 mm	6.4	9 h 21	5	Good coverage

What has changed

South Vienna 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

-0.4

Feb

-0.4

Mar

-0.7

Apr

-1.0

May

-0.8

Jun

-1.0

Jul

-1.1

Aug

-1.1

Sep

-0.1

Oct

-0.1

Nov

-0.8

Dec

+1.2

September daytime highs, 2011–2025. Last recorded: 27.3°C.

Records at LONDON STATE FISH HATCHERY, 1918–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C25 Jan 1950	-31.1°C19 Jan 1994	88 mm21 Jan 1959	288 mm1937 · driest 6 mm in 1981	101
February	23.3°C21 Feb 2018	-28.3°C3 Feb 1985	55 mm23 Feb 1975	147 mm2022 · driest 3 mm in 1987	101
March	29.4°C23 Mar 2026	-25.6°C9 Mar 1984	90 mm9 Mar 1964	269 mm1964 · driest 5 mm in 2000	99
April	31.7°C30 Apr 1942	-11.1°C1 Apr 1923	62 mm30 Apr 2017	225 mm1940 · driest 0 mm in 2003	101
May	33.9°C18 May 1962	-5.0°C10 May 1966	63 mm25 May 1947	238 mm1968 · driest 19 mm in 1965	101
June	38.9°C25 Jun 1988	1.7°C10 Jun 1977	100 mm27 Jun 1932	244 mm1958 · driest 15 mm in 1962	100
July	42.8°C9 Jul 1936	5.6°C6 Jul 1972	98 mm11 Jul 2017	297 mm2017 · driest 9 mm in 2003	100
August	38.9°C19 Aug 1936	2.8°C29 Aug 1965	108 mm6 Aug 1995	235 mm1935 · driest 12 mm in 1993	99
September	38.9°C2 Sep 1953	-2.2°C28 Sep 1942	121 mm14 Sep 1979	210 mm1965 · driest 3 mm in 2019	100
October	33.3°C4 Oct 1951	-9.4°C29 Oct 1925	108 mm8 Oct 2025	177 mm2025 · driest 1 mm in 1963	100
November	26.7°C1 Nov 1950	-18.3°C30 Nov 1929	87 mm6 Nov 2017	287 mm1985 · driest 8 mm in 1976	100
December	23.3°C3 Dec 1982	-27.8°C22 Dec 1989	69 mm22 Dec 2013	195 mm1990 · driest 13 mm in 1958	100

Typical days per month at LONDON STATE FISH HATCHERY, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	26	2	3
February	0	0	23	2	3
March	<1	0	21	3	2
April	2	0	8	4	<1
May	11	2	<1	4	0
June	21	8	0	4	0
July	27	13	0	4	0
August	24	7	0	2	0
September	15	5	<1	2	0
October	5	<1	5	2	<1
November	<1	0	17	3	<1
December	0	0	23	3	2

How often, not how much — every day in LONDON STATE FISH HATCHERY’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%	7%	29%	-1.4–5.5°C
February	<1%	25%	8%	26%	0.6–8.2°C
March	8%	29%	10%	35%	6.1–14.1°C
April	24%	32%	12%	39%	13.8–19.7°C
May	49%	32%	13%	42%	20.0–25.4°C
June	68%	29%	11%	36%	25.3–29.0°C
July	73%	27%	11%	28%	27.6–31.4°C
August	77%	22%	9%	21%	26.8–30.1°C
September	68%	22%	8%	20%	23.0–27.3°C
October	37%	22%	7%	23%	16.6–21.2°C
November	6%	27%	9%	29%	7.7–13.2°C
December	<1%	26%	8%	27%	1.0–7.5°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.

1919Each stripe is one year’s mean temperature against the 88-year average. Warmest: 2024. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4525127
NOAA station: USC00334681 · LONDON STATE FISH HATCHERY
Station distance: 9.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 39.93°, 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 LONDON STATE FISH HATCHERY is what differs

London→West Jefferson→Lisbon→Bethel→South Charleston→Choctaw Lake→

Or put two places side by side: South Vienna vs London

Best time to visitSouth Vienna.