United States · 1991–2020

Best time to visit
Fairfield.

September leads for comfortable weather in Fairfield: typically 25.8°C by day, 11.4°C at night, with 59 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.8°C

Typical low11.4°C

Rain in September59 mm

Comfort

September

September · June · May

82climate match

Beach

August

August · July · June

72climate match

Outdoors

October

October · September · April

79climate match

The weakest month is January, scoring 5 against September’s 82 — days reach only 2°C, 22° below the 24°C the score treats as ideal, and nights drop to -9.6°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

52° / -9.6°

Feb

54.4° / -7.9°

Mar

2411° / -2.7°

Apr

4817.1° / 2.9°

May

6722.7° / 9.5°

Jun

7028.7° / 15.6°

Jul

6030.7° / 18°

Aug

6729.5° / 16.6°

Sep

8225.8° / 11.4°

Oct

5718.6° / 4.3°

Nov

2410.5° / -2.5°

Dec

53.7° / -7.5°

Monthly climate evidence for Fairfield — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2°C	-9.6°C	10 mm	2	9 h 35	5	Strong coverage
February	4.4°C	-7.9°C	25 mm	2.8	10 h 36	5	Strong coverage
March	11°C	-2.7°C	36 mm	4.3	11 h 49	24	Strong coverage
April	17.1°C	2.9°C	68 mm	6.1	13 h 13	48	Strong coverage
May	22.7°C	9.5°C	132 mm	9.1	14 h 24	67	Strong coverage
June	28.7°C	15.6°C	106 mm	7.3	15 h 02	70	Strong coverage
July	30.7°C	18°C	104 mm	6.8	14 h 47	60	Strong coverage
August	29.5°C	16.6°C	96 mm	6.7	13 h 46	67	Strong coverage
September	25.8°C	11.4°C	59 mm	5.4	12 h 25	82	Strong coverage
October	18.6°C	4.3°C	65 mm	4.9	11 h 03	57	Strong coverage
November	10.5°C	-2.5°C	32 mm	2.9	9 h 53	24	Strong coverage
December	3.7°C	-7.5°C	29 mm	2.5	9 h 18	5	Strong coverage

What has changed

Fairfield runs +0.8°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

+0.3

Mar

+1.8

Apr

+0.3

May

+0.7

Jun

+1.3

Jul

-0.7

Aug

-0.9

Sep

+1.2

Oct

+0.5

Nov

+1.9

Dec

+2.0

September daytime highs, 2011–2025. Last recorded: 26.4°C.

Records at CLAY CTR, 1971–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C11 Jan 1990	-31.7°C12 Jan 1974	25 mm17 Jan 2017	38 mm2017 · driest 0 mm in 1998	54
February	26.7°C26 Feb 1995	-32.8°C16 Feb 2021	76 mm24 Feb 2003	76 mm2003 · driest 0 mm in 1984	55
March	35.6°C22 Mar 2026	-26.1°C4 Mar 1978	152 mm2 Mar 2002	165 mm1973 · driest 0 mm in 1988	54
April	35.0°C23 Apr 1989	-16.1°C3 Apr 1975	56 mm21 Apr 1984	174 mm1994 · driest 5 mm in 1989	55
May	37.2°C22 May 2005	-4.4°C2 May 1983	114 mm3 May 1987	239 mm2001 · driest 21 mm in 1992	55
June	41.1°C28 Jun 2012	1.7°C1 Jun 1982	110 mm15 Jun 2012	236 mm2010 · driest 10 mm in 2002	55
July	41.1°C28 Jul 1974	5.6°C30 Jul 1971	183 mm30 Jul 1998	366 mm1993 · driest 0 mm in 2003	56
August	41.7°C17 Aug 1983	5.6°C4 Aug 1974	93 mm31 Aug 2025	225 mm2014 · driest 7 mm in 2000	54
September	38.9°C1 Sep 1984	-6.1°C30 Sep 1984	103 mm12 Sep 1977	267 mm1973 · driest 4 mm in 1991	55
October	35.0°C12 Oct 2015	-13.9°C22 Oct 2006	71 mm30 Oct 1979	216 mm2008 · driest 0 mm in 2003	55
November	28.9°C9 Nov 2006	-23.9°C28 Nov 1976	53 mm16 Nov 1996	94 mm1972 · driest 0 mm in 2002	55
December	24.4°C1 Dec 1995	-39.4°C22 Dec 1983	114 mm11 Dec 2000	254 mm2000 · driest 0 mm in 2003	55

Typical days per month at CLAY CTR, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	2
February	<1	0	25	<1	2
March	1	0	21	<1	1
April	4	<1	8	2	<1
May	12	4	<1	4	0
June	23	13	0	3	0
July	28	18	0	3	0
August	26	14	0	3	0
September	17	7	<1	2	0
October	6	1	6	2	<1
November	<1	0	20	1	<1
December	0	0	29	<1	2

How often, not how much — every day in CLAY CTR’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%	7%	<1%	2%	-2.6–6.1°C
February	4%	9%	1%	5%	-1.6–9.4°C
March	15%	15%	4%	12%	6.6–14.6°C
April	33%	20%	8%	19%	14.2–19.6°C
May	52%	29%	13%	33%	20.3–25.0°C
June	75%	23%	10%	24%	26.3–30.7°C
July	78%	21%	10%	22%	29.1–32.8°C
August	79%	20%	9%	16%	27.8–31.9°C
September	73%	17%	7%	14%	23.8–28.3°C
October	43%	15%	6%	12%	16.0–21.8°C
November	12%	10%	4%	6%	6.5–13.6°C
December	<1%	9%	2%	4%	0.2–6.6°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.

1972Each stripe is one year’s mean temperature against the 50-year average. Warmest: 2012. Coolest: 1979.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5067918
NOAA station: USC00251684 · CLAY CTR
Station distance: 10.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 40.43°, 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 CLAY CTR is what differs

Sutton→Harvard→Clay Center→Edgar→Glenvil→Deweese→

Or put two places side by side: Fairfield vs Sutton

Best time to visitFairfield.