United States · 1991–2020

Best time to visit
Sioux Valley.

September leads for comfortable weather in Sioux Valley: typically 23.9°C by day, 10.6°C at night, with 74 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.9°C

Typical low10.6°C

Rain in September74 mm

Comfort

September

September · August · June

83climate match

Beach

July

July · August · June

73climate match

Outdoors

September

September · May · October

76climate match

The weakest month is January, scoring 5 against September’s 83 — days reach only -4.6°C, 29° 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

5-4.6° / -14.6°

Feb

5-2.2° / -12.3°

Mar

55.1° / -5.5°

Apr

2913.7° / 1.3°

May

5920.8° / 8.6°

Jun

7127° / 15.2°

Jul

6629.2° / 17.2°

Aug

7527.7° / 15.6°

Sep

8323.9° / 10.6°

Oct

4615.9° / 3.3°

Nov

56° / -4.5°

Dec

5-1.8° / -11°

Monthly climate evidence for Sioux Valley — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.6°C	-14.6°C	21 mm	4.1	9 h 17	5	Strong coverage
February	-2.2°C	-12.3°C	21 mm	3.6	10 h 25	5	Strong coverage
March	5.1°C	-5.5°C	42 mm	5	11 h 47	5	Strong coverage
April	13.7°C	1.3°C	87 mm	8.1	13 h 21	29	Strong coverage
May	20.8°C	8.6°C	122 mm	10.8	14 h 41	59	Strong coverage
June	27°C	15.2°C	128 mm	9.9	15 h 24	71	Strong coverage
July	29.2°C	17.2°C	97 mm	7.3	15 h 07	66	Strong coverage
August	27.7°C	15.6°C	90 mm	7.4	13 h 58	75	Strong coverage
September	23.9°C	10.6°C	74 mm	6.6	12 h 27	83	Strong coverage
October	15.9°C	3.3°C	61 mm	6.1	10 h 56	46	Strong coverage
November	6°C	-4.5°C	38 mm	4.4	9 h 37	5	Strong coverage
December	-1.8°C	-11°C	24 mm	4.3	8 h 57	5	Strong coverage

What has changed

Sioux Valley runs +1.4°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

+1.2

Feb

-0.4

Mar

+1.9

Apr

0.0

May

+0.2

Jun

+2.1

Jul

+1.5

Aug

+1.3

Sep

+3.4

Oct

+1.6

Nov

+1.5

Dec

+2.2

September daytime highs, 2011–2025. Last recorded: 24.8°C.

Records at LAKE PARK 3SSE, 1912–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C25 Jan 1981	-38.9°C11 Jan 1918	50 mm11 Jan 1975	83 mm1975 · driest 0 mm in 1931	105
February	19.4°C27 Feb 2024	-36.1°C2 Feb 1917	41 mm1 Feb 1915	67 mm2012 · driest 0 mm in 1982	104
March	30.6°C19 Mar 2012	-31.1°C11 Mar 1948	58 mm24 Mar 1937	118 mm1987 · driest 3 mm in 1994	105
April	35.6°C30 Apr 2007	-17.2°C3 Apr 1936	63 mm13 Apr 1991	177 mm2001 · driest 1 mm in 1915	104
May	41.7°C30 May 1934	-8.9°C3 May 1967	89 mm19 May 1917	275 mm1959 · driest 2 mm in 1934	104
June	41.1°C7 Jun 2011	1.1°C9 Jun 1915	152 mm7 Jun 1953	354 mm2024 · driest 21 mm in 2021	104
July	41.7°C17 Jul 1936	5.6°C4 Jul 1967	111 mm4 Jul 1962	276 mm2011 · driest 8 mm in 1975	104
August	40.6°C24 Aug 1936	2.2°C30 Aug 1915	134 mm18 Aug 2007	305 mm1979 · driest 9 mm in 1950	104
September	39.4°C21 Sep 2022	-5.6°C22 Sep 1913	163 mm15 Sep 2004	283 mm2004 · driest 5 mm in 2024	106
October	35.0°C4 Oct 2006	-14.4°C30 Oct 1917	74 mm10 Oct 1914	165 mm2019 · driest 0 mm in 1989	106
November	26.7°C4 Nov 2008	-23.9°C28 Nov 1976	54 mm9 Nov 1977	122 mm1991 · driest 0 mm in 2007	106
December	20.0°C9 Dec 1939	-33.9°C29 Dec 1917	48 mm30 Dec 1968	156 mm1968 · driest 0 mm in 1982	104

Typical days per month at LAKE PARK 3SSE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	4
February	0	0	27	<1	4
March	<1	0	25	2	3
April	2	<1	12	3	1
May	9	3	1	4	0
June	20	10	0	4	0
July	26	15	0	3	0
August	24	10	0	3	0
September	15	5	<1	2	0
October	4	<1	9	2	<1
November	<1	0	23	1	2
December	0	0	30	<1	4

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 81); on 2011–2025 it is September (85). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in LAKE PARK 3SSE’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%	11%	1%	5%	-8.7–0.2°C
February	0%	12%	2%	6%	-6.3–2.6°C
March	4%	16%	5%	12%	0.7–9.5°C
April	20%	23%	8%	24%	10.2–17.3°C
May	46%	30%	11%	36%	18.4–24.7°C
June	65%	30%	13%	35%	24.2–29.5°C
July	77%	22%	9%	19%	26.8–31.7°C
August	75%	23%	8%	20%	25.5–30.6°C
September	60%	21%	8%	22%	20.6–26.2°C
October	30%	17%	5%	15%	13.2–19.7°C
November	3%	13%	3%	8%	2.2–10.1°C
December	0%	12%	2%	7%	-5.2–2.2°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.

1913Each stripe is one year’s mean temperature against the 96-year average. Warmest: 2012. Coolest: 1996.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5047439
NOAA station: USC00134561 · LAKE PARK 3SSE
Station distance: 15.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 43.54°, 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 LAKE PARK 3SSE is what differs

Lake Park→Harris→Hagerty→May City→

Or put two places side by side: Sioux Valley vs Lake Park

Best time to visitSioux Valley.

September

July

September

The whole year,without the guesswork.

Sioux Valley runs +1.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Sioux Valley.

The whole year,
without the guesswork.

Sioux Valley runs +1.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.