United States · 1991–2020

Best time to visit
Oswego.

September leads for comfortable weather in Oswego: typically 27.4°C by day, 15.2°C at night, with 114 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.4°C

Typical low15.2°C

Rain in September114 mm

Comfort

September

September · May · October

74climate match

Beach

August

August · July · June

74climate match

Outdoors

October

October · April · November

79climate match

The weakest month is January, scoring 5 against September’s 74 — days reach only 6.5°C, 17° below the 24°C the score treats as ideal, and nights drop to -4.4°C.

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

56.5° / -4.4°

Feb

179.4° / -2.4°

Mar

3514.5° / 2.2°

Apr

5519.8° / 7.4°

May

6924.4° / 13.2°

Jun

5729.3° / 18.3°

Jul

4932° / 20.8°

Aug

5431.8° / 19.9°

Sep

7427.4° / 15.2°

Oct

6821.3° / 8.6°

Nov

3614.1° / 2.4°

Dec

118.2° / -2.4°

Monthly climate evidence for Oswego — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.5°C	-4.4°C	44 mm	5.4	9 h 52	5	Strong coverage
February	9.4°C	-2.4°C	49 mm	4.9	10 h 46	17	Strong coverage
March	14.5°C	2.2°C	82 mm	7.7	11 h 51	35	Strong coverage
April	19.8°C	7.4°C	126 mm	8.3	13 h 06	55	Strong coverage
May	24.4°C	13.2°C	180 mm	10.2	14 h 08	69	Strong coverage
June	29.3°C	18.3°C	137 mm	8.9	14 h 42	57	Strong coverage
July	32°C	20.8°C	108 mm	7	14 h 29	49	Strong coverage
August	31.8°C	19.9°C	97 mm	6	13 h 35	54	Strong coverage
September	27.4°C	15.2°C	114 mm	6.5	12 h 22	74	Strong coverage
October	21.3°C	8.6°C	94 mm	7.1	11 h 10	68	Strong coverage
November	14.1°C	2.4°C	76 mm	6.2	10 h 08	36	Strong coverage
December	8.2°C	-2.4°C	64 mm	5.3	9 h 37	11	Strong coverage

What has changed

Oswego runs -0.0°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

+0.6

Feb

-0.4

Mar

+0.7

Apr

-1.1

May

-1.1

Jun

+0.7

Jul

-0.4

Aug

-1.0

Sep

+0.3

Oct

-0.5

Nov

+0.3

Dec

+1.5

September daytime highs, 2011–2025. Last recorded: 28.3°C.

Records at COLUMBUS, 1892–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.0°C11 Jan 1911	-28.3°C22 Jan 1930	103 mm2 Jan 1897	214 mm1916 · driest 0 mm in 1986	128
February	29.4°C23 Feb 1996	-33.3°C13 Feb 1905	142 mm23 Feb 1985	200 mm1985 · driest 1 mm in 1901	129
March	33.9°C21 Mar 1916	-27.2°C7 Mar 1943	84 mm20 Mar 2012	231 mm1973 · driest 9 mm in 1956	128
April	36.1°C12 Apr 1972	-8.9°C13 Apr 1957	142 mm12 Apr 1994	357 mm2026 · driest 7 mm in 1989	128
May	36.7°C31 May 1934	-2.2°C1 May 1909	158 mm19 May 1943	512 mm2019 · driest 29 mm in 1911	129
June	42.2°C18 Jun 1918	5.6°C15 Jun 1917	213 mm22 Jun 1948	457 mm2007 · driest 6 mm in 2020	128
July	47.2°C14 Jul 1954	7.2°C6 Jul 1972	203 mm3 Jul 1976	376 mm1958 · driest 6 mm in 1954	130
August	46.1°C9 Aug 1936	6.7°C31 Aug 1915	189 mm18 Aug 1996	295 mm2019 · driest 0 mm in 2000	131
September	42.2°C3 Sep 1939	-1.1°C27 Sep 1942	193 mm25 Sep 1993	404 mm1993 · driest 4 mm in 1897	129
October	36.7°C7 Oct 1963	-9.4°C30 Oct 1917	158 mm10 Oct 2014	357 mm1941 · driest 1 mm in 1963	129
November	29.4°C10 Nov 2006	-15.6°C29 Nov 1976	141 mm21 Nov 1979	242 mm1985 · driest 0 mm in 1989	130
December	25.6°C28 Dec 2025	-26.1°C24 Dec 1989	121 mm18 Dec 1895	267 mm1895 · driest 2 mm in 1950	130

Typical days per month at COLUMBUS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	1	2
February	<1	0	20	2	<1
March	2	<1	12	3	<1
April	7	<1	3	4	0
May	16	4	0	5	0
June	26	15	0	4	0
July	30	24	0	3	0
August	30	22	0	3	0
September	22	10	0	3	0
October	10	1	1	3	0
November	1	0	11	2	<1
December	0	0	21	2	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 78); on 2011–2025 it is September (78). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in COLUMBUS’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	2%	16%	5%	13%	3.1–9.6°C
February	7%	18%	5%	15%	4.7–12.8°C
March	24%	22%	8%	21%	11.4–18.6°C
April	45%	27%	12%	30%	17.8–23.1°C
May	61%	31%	15%	40%	22.8–27.0°C
June	71%	29%	14%	33%	27.5–32.3°C
July	79%	21%	9%	19%	30.4–35.1°C
August	80%	20%	9%	20%	29.7–35.2°C
September	75%	22%	11%	21%	26.0–31.0°C
October	58%	20%	9%	20%	19.3–25.1°C
November	20%	18%	7%	15%	11.5–17.3°C
December	3%	16%	6%	12%	5.1–10.9°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.

1893Each stripe is one year’s mean temperature against the 121-year average. Warmest: 1954. Coolest: 1895.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4276800
NOAA station: USC00141740 · COLUMBUS
Station distance: 24.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 37.17°, 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 COLUMBUS is what differs

Baxter Springs→Columbus→Riverton→Scammon→Lowell→West Mineral→

Or put two places side by side: Oswego vs Baxter Springs

Best time to visitOswego.