United States · 1991–2020

Best time to visit
Batavia.

September leads for comfortable weather in Batavia: typically 25.4°C by day, 12.5°C at night, with 91 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.4°C

Typical low12.5°C

Rain in September91 mm

Comfort

September

September · May · June

79climate match

Beach

July

July · August · June

73climate match

Outdoors

October

October · April · September

75climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 0.4°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

50.4° / -9.3°

Feb

53° / -7°

Mar

1810.2° / -1.2°

Apr

4617.5° / 4.7°

May

6722.9° / 10.9°

Jun

6628° / 16.3°

Jul

6030.1° / 18.5°

Aug

6629.1° / 17.3°

Sep

7925.4° / 12.5°

Oct

5518.1° / 6°

Nov

199.7° / -0.4°

Dec

52.9° / -5.9°

Monthly climate evidence for Batavia — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.4°C	-9.3°C	39 mm	6	9 h 32	5	Strong coverage
February	3°C	-7°C	46 mm	6.1	10 h 34	5	Strong coverage
March	10.2°C	-1.2°C	61 mm	6.8	11 h 49	18	Strong coverage
April	17.5°C	4.7°C	95 mm	8.8	13 h 15	46	Strong coverage
May	22.9°C	10.9°C	139 mm	11	14 h 27	67	Strong coverage
June	28°C	16.3°C	128 mm	9.4	15 h 06	66	Strong coverage
July	30.1°C	18.5°C	101 mm	7.7	14 h 51	60	Strong coverage
August	29.1°C	17.3°C	100 mm	7.4	13 h 48	66	Strong coverage
September	25.4°C	12.5°C	91 mm	6.9	12 h 25	79	Strong coverage
October	18.1°C	6°C	76 mm	7.1	11 h 02	55	Strong coverage
November	9.7°C	-0.4°C	59 mm	5.8	9 h 50	19	Strong coverage
December	2.9°C	-5.9°C	43 mm	5.8	9 h 14	5	Strong coverage

What has changed

Batavia runs +0.2°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

+1.0

Feb

+0.5

Mar

+1.0

Apr

-0.9

May

-0.9

Jun

-0.5

Jul

-1.1

Aug

-0.4

Sep

+1.3

Oct

-0.2

Nov

+0.2

Dec

+2.5

September daytime highs, 2011–2025. Last recorded: 27.5°C.

Records at FAIRFIELD, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C31 Jan 1989	-33.9°C22 Jan 1930	49 mm1 Jan 1948	105 mm2024 · driest 0 mm in 1919	128
February	25.6°C28 Feb 2024	-35.0°C3 Feb 1996	57 mm9 Feb 2001	125 mm1911 · driest 0 mm in 1948	128
March	31.7°C22 Mar 2026	-26.1°C1 Mar 1962	74 mm4 Mar 1976	142 mm1998 · driest 1 mm in 1918	126
April	33.9°C11 Apr 1896	-12.8°C6 Apr 1982	77 mm18 Apr 2013	240 mm1893 · driest 4 mm in 1948	127
May	38.9°C31 May 1934	-3.3°C3 May 2005	111 mm30 May 2004	315 mm1996 · driest 15 mm in 1897	126
June	40.0°C25 Jun 1988	2.2°C6 Jun 1894	83 mm26 Jun 1932	331 mm2010 · driest 16 mm in 1911	127
July	45.6°C15 Jul 1936	6.1°C18 Jul 1911	107 mm14 Jul 1902	369 mm1993 · driest 0 mm in 1947	126
August	45.0°C9 Aug 1934	1.7°C31 Aug 1915	118 mm5 Aug 1970	242 mm1902 · driest 0 mm in 1909	126
September	39.4°C1 Sep 1953	-5.0°C28 Sep 1942	148 mm21 Sep 2017	322 mm1926 · driest 0 mm in 1947	126
October	35.6°C2 Oct 1953	-17.2°C30 Oct 1925	91 mm9 Oct 1936	243 mm1941 · driest 0 mm in 1952	124
November	27.2°C1 Nov 1938	-21.1°C30 Nov 1929	70 mm3 Nov 1944	166 mm1934 · driest 1 mm in 1989	125
December	23.3°C16 Dec 2021	-32.8°C26 Dec 1914	59 mm2 Dec 1982	132 mm1971 · driest 2 mm in 1976	125

Typical days per month at FAIRFIELD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	1	4
February	0	0	25	1	4
March	<1	0	19	2	2
April	4	<1	6	3	<1
May	13	3	<1	5	0
June	24	10	0	4	0
July	29	16	0	3	0
August	28	13	0	3	0
September	17	6	<1	3	0
October	5	<1	5	2	<1
November	<1	0	17	2	<1
December	0	0	26	1	4

How often, not how much — every day in FAIRFIELD’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%	16%	4%	11%	-4.4–3.9°C
February	<1%	18%	4%	14%	-1.8–7.0°C
March	9%	21%	7%	21%	5.5–13.1°C
April	27%	29%	10%	36%	14.2–20.4°C
May	53%	31%	12%	38%	20.4–26.0°C
June	69%	30%	13%	35%	25.9–30.4°C
July	76%	24%	11%	25%	28.3–33.3°C
August	77%	23%	10%	23%	27.3–32.1°C
September	67%	24%	10%	25%	23.0–27.9°C
October	38%	21%	8%	22%	15.7–21.7°C
November	7%	18%	6%	15%	6.2–12.6°C
December	<1%	18%	4%	15%	-1.8–6.1°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.

1895Each stripe is one year’s mean temperature against the 117-year average. Warmest: 2012. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4847819
NOAA station: USC00132789 · FAIRFIELD
Station distance: 18 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 40.99°, 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 FAIRFIELD is what differs

Fairfield→Maharishi Vedic City→Eldon→Richland→Libertyville→Packwood→

Or put two places side by side: Batavia vs Fairfield

Best time to visitBatavia.