United States · 1991–2020

Best time to visit
Okoboji.

September leads for comfortable weather in Okoboji: typically 23.3°C by day, 10.8°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.3°C

Typical low10.8°C

Rain in September81 mm

Comfort

September

September · August · June

81climate match

Beach

July

July · August · June

72climate match

Outdoors

September

September · May · October

77climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only -4.2°C, 28° 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

5-4.2° / -13.7°

Feb

5-1.7° / -11.4°

Mar

55.5° / -4.8°

Apr

3314° / 1.7°

May

6320.8° / 8.7°

Jun

7526.2° / 14.6°

Jul

7228.1° / 16.8°

Aug

8026.7° / 15.4°

Sep

8123.3° / 10.8°

Oct

4615.6° / 3.5°

Nov

56.2° / -4.3°

Dec

5-1.7° / -10.6°

Monthly climate evidence for Okoboji — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-4.2°C	-13.7°C	21 mm	4.2	9 h 18	5	Strong coverage
February	-1.7°C	-11.4°C	20 mm	4.2	10 h 26	5	Strong coverage
March	5.5°C	-4.8°C	39 mm	4.8	11 h 47	5	Strong coverage
April	14°C	1.7°C	82 mm	7.3	13 h 21	33	Strong coverage
May	20.8°C	8.7°C	103 mm	9.4	14 h 40	63	Strong coverage
June	26.2°C	14.6°C	122 mm	8.3	15 h 23	75	Strong coverage
July	28.1°C	16.8°C	87 mm	7.2	15 h 06	72	Strong coverage
August	26.7°C	15.4°C	88 mm	6.3	13 h 58	80	Strong coverage
September	23.3°C	10.8°C	81 mm	6	12 h 27	81	Strong coverage
October	15.6°C	3.5°C	56 mm	5.4	10 h 57	46	Strong coverage
November	6.2°C	-4.3°C	37 mm	4.5	9 h 38	5	Strong coverage
December	-1.7°C	-10.6°C	23 mm	4.3	8 h 59	5	Strong coverage

What has changed

Okoboji runs +0.4°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

+1.6

Feb

-0.3

Mar

+1.3

Apr

-1.0

May

-1.0

Jun

-0.2

Jul

-0.9

Aug

-0.7

Sep

+1.8

Oct

0.0

Nov

+1.3

Dec

+2.5

September daytime highs, 2011–2025. Last recorded: 24.2°C.

Records at MILFORD 4 NW, 1919–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.2°C24 Jan 1981	-36.7°C3 Jan 2010	30 mm31 Jan 2010	60 mm2010 · driest 0 mm in 2025	91
February	18.3°C26 Feb 2024	-33.3°C2 Feb 1996	45 mm28 Feb 1951	73 mm1971 · driest 0 mm in 2008	92
March	29.4°C31 Mar 2026	-30.0°C5 Mar 1960	66 mm23 Mar 1987	113 mm1987 · driest 3 mm in 1994	91
April	33.9°C30 Apr 2007	-16.7°C1 Apr 1924	67 mm22 Apr 1985	177 mm1991 · driest 6 mm in 1959	91
May	36.7°C14 May 2013	-7.8°C3 May 1967	78 mm5 May 2007	262 mm1959 · driest 8 mm in 1925	91
June	38.9°C8 Jun 1985	1.1°C4 Jun 1945	158 mm24 Jun 2018	381 mm2018 · driest 5 mm in 2019	91
July	39.4°C31 Jul 1955	4.4°C22 Jul 1925	157 mm4 Jul 1962	268 mm1987 · driest 3 mm in 1959	90
August	38.9°C13 Aug 1965	1.7°C20 Aug 1950	128 mm30 Aug 1962	278 mm2017 · driest 10 mm in 1976	86
September	37.8°C6 Sep 1976	-4.4°C23 Sep 1983	151 mm15 Sep 2004	330 mm2004 · driest 5 mm in 2024	87
October	33.3°C5 Oct 1963	-23.3°C29 Oct 1925	78 mm1 Oct 2021	154 mm2021 · driest 0 mm in 1989	89
November	25.6°C8 Nov 1999	-25.6°C27 Nov 2014	76 mm9 Nov 1977	137 mm2015 · driest 1 mm in 2023	90
December	19.4°C5 Dec 1939	-33.9°C28 Dec 1924	31 mm27 Dec 2018	76 mm1982 · driest 1 mm in 2002	90

Typical days per month at MILFORD 4 NW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	5
February	0	0	27	<1	5
March	<1	0	25	1	2
April	2	<1	11	3	<1
May	8	2	1	3	0
June	19	6	0	4	0
July	26	10	0	3	0
August	22	6	0	3	0
September	13	3	<1	2	0
October	3	<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 80); on 2011–2025 it is September (88). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MILFORD 4 NW’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%	12%	<1%	5%	-8.4–-0.3°C
February	0%	13%	2%	8%	-5.6–3.0°C
March	4%	18%	4%	15%	0.8–10.1°C
April	20%	25%	9%	27%	10.3–17.9°C
May	47%	30%	10%	35%	18.6–24.2°C
June	67%	29%	12%	34%	24.4–28.5°C
July	76%	23%	9%	21%	26.5–30.9°C
August	77%	22%	9%	20%	25.0–29.1°C
September	61%	21%	8%	21%	20.5–25.4°C
October	28%	17%	5%	14%	13.1–19.2°C
November	2%	15%	4%	11%	1.9–9.5°C
December	0%	12%	2%	6%	-5.9–2.3°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.

1920Each stripe is one year’s mean temperature against the 82-year average. Warmest: 1987. Coolest: 1951.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4869801
NOAA station: USC00135493 · MILFORD 4 NW
Station distance: 3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 43.39°, 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 MILFORD 4 NW is what differs

Milford→Arnolds Park→Wahpeton→West Okoboji→Crescent Beach Resort→Crows Nest Resort→

Or put two places side by side: Okoboji vs Milford

Best time to visitOkoboji.

September

July

September

The whole year,without the guesswork.

Okoboji runs +0.4°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Okoboji.

The whole year,
without the guesswork.

Okoboji runs +0.4°C
on the 1961–1990 baseline.

Nearby, measured,
and named.