United States · 1991–2020

Best time to visit
Fairfield.

September leads for comfortable weather in Fairfield: typically 23.9°C by day, 15.3°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.9°C

Typical low15.3°C

Rain in September101 mm

Comfort

September

September · June · August

87climate match

Beach

July

July · August · June

82climate match

Outdoors

May

May · October · September

81climate match

The weakest month is January, scoring 5 against September’s 87 — days reach only 3.4°C, 21° 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

53.4° / -4.4°

Feb

54.5° / -3.7°

Mar

68.4° / -0.1°

Apr

3614.4° / 5.2°

May

6620° / 10.8°

Jun

8025.2° / 16.2°

Jul

6628.4° / 19.8°

Aug

6727.6° / 19.3°

Sep

8723.9° / 15.3°

Oct

5617.8° / 8.9°

Nov

2911.8° / 3.4°

Dec

56.4° / -1.2°

Monthly climate evidence for Fairfield — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 10 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	3.4°C	-4.4°C	81 mm	8.9	3.8°C	9 h 31	5	Strong coverage
February	4.5°C	-3.7°C	79 mm	8	1.9°C	10 h 33	5	Strong coverage
March	8.4°C	-0.1°C	104 mm	9.3	2.8°C	11 h 48	6	Strong coverage
April	14.4°C	5.2°C	106 mm	9	6.8°C	13 h 15	36	Strong coverage
May	20°C	10.8°C	91 mm	9.5	12.5°C	14 h 28	66	Strong coverage
June	25.2°C	16.2°C	96 mm	8.4	18.3°C	15 h 07	80	Strong coverage
July	28.4°C	19.8°C	84 mm	7.3	22.2°C	14 h 52	66	Strong coverage
August	27.6°C	19.3°C	101 mm	7.6	23.1°C	13 h 49	67	Strong coverage
September	23.9°C	15.3°C	101 mm	6.8	21.8°C	12 h 25	87	Strong coverage
October	17.8°C	8.9°C	97 mm	7	18.0°C	11 h 02	56	Strong coverage
November	11.8°C	3.4°C	79 mm	7.4	12.7°C	9 h 49	29	Strong coverage
December	6.4°C	-1.2°C	101 mm	9.3	7.8°C	9 h 13	5	Strong coverage

What has changed

Fairfield runs +1.3°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

+1.9

Feb

+2.1

Mar

+1.3

Apr

+1.0

May

+1.1

Jun

+1.1

Jul

+1.6

Aug

+0.9

Sep

+1.2

Oct

+1.2

Nov

+0.6

Dec

+2.1

September daytime highs, 2011–2025. Last recorded: 24.4°C.

Records at IGOR I SIKORSKY MEM AP, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C12 Jan 2020	-21.7°C22 Jan 1984	109 mm21 Jan 1979	285 mm1979 · driest 10 mm in 1970	78
February	20.0°C16 Feb 2023	-21.0°C14 Feb 2016	60 mm25 Feb 2010	169 mm1972 · driest 11 mm in 1987	78
March	28.9°C13 Mar 1990	-15.6°C19 Mar 1967	107 mm22 Mar 1977	264 mm2024 · driest 18 mm in 1981	78
April	32.8°C28 Apr 1990	-7.8°C7 Apr 1982	135 mm23 Apr 2006	273 mm1983 · driest 18 mm in 1985	77
May	36.1°C20 May 1996	-0.6°C10 May 1966	82 mm29 May 1968	242 mm1989 · driest 11 mm in 1986	77
June	36.1°C25 Jun 2025	5.0°C1 Jun 1967	157 mm19 Jun 1972	450 mm1972 · driest 2 mm in 1949	78
July	39.4°C22 Jul 1957	9.4°C1 Jul 1988	151 mm19 Jul 1971	326 mm1971 · driest 12 mm in 1979	79
August	37.8°C27 Aug 1948	6.7°C29 Aug 1982	118 mm19 Aug 1991	338 mm1952 · driest 18 mm in 1981	78
September	37.2°C2 Sep 1953	2.2°C21 Sep 1956	147 mm1 Sep 2021	218 mm2018 · driest 11 mm in 1959	78
October	31.7°C8 Oct 2007	-3.3°C20 Oct 1972	121 mm15 Oct 1955	307 mm2005 · driest 4 mm in 2024	78
November	27.2°C1 Nov 2024	-10.5°C23 Nov 2018	79 mm2 Nov 1954	260 mm1972 · driest 9 mm in 1976	78
December	24.4°C7 Dec 1998	-20.0°C26 Dec 1980	94 mm4 Dec 1968	212 mm2023 · driest 8 mm in 1955	78

Typical days per month at IGOR I SIKORSKY MEM AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	4
February	0	0	22	3	4
March	0	0	16	3	3
April	<1	<1	2	3	<1
May	5	<1	0	3	0
June	17	4	0	3	0
July	27	11	0	3	0
August	26	8	0	3	0
September	12	1	0	3	0
October	1	<1	<1	3	<1
November	0	0	7	3	<1
December	0	0	20	4	3

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 91); on 2011–2025 it is September (86). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in IGOR I SIKORSKY MEM AP’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%	28%	9%	32%	0.0–5.8°C
February	0%	28%	9%	32%	1.3–6.8°C
March	1%	30%	11%	35%	6.0–10.4°C
April	12%	29%	10%	35%	12.2–15.8°C
May	39%	30%	10%	34%	17.4–21.6°C
June	68%	27%	9%	29%	23.2–26.7°C
July	76%	24%	9%	22%	26.6–30.0°C
August	76%	24%	9%	23%	26.0–28.6°C
September	67%	23%	9%	22%	22.4–25.1°C
October	27%	21%	9%	18%	16.2–19.9°C
November	2%	26%	10%	28%	9.9–13.8°C
December	<1%	30%	11%	35%	2.8–8.2°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.

1949Each stripe is one year’s mean temperature against the 76-year average. Warmest: 2012. Coolest: 1962.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4834157
NOAA station: USW00094702 · IGOR I SIKORSKY MEM AP
Station distance: 11.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 41.14°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 10 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
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 IGOR I SIKORSKY MEM AP is what differs

Bridgeport→Milford→Stratford→City of Milford (balance)→Shelton→Trumbull→

Or put two places side by side: Fairfield vs Bridgeport

Best time to visitFairfield.

September

July

May

The whole year,without the guesswork.

Fairfield runs +1.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Fairfield.

The whole year,
without the guesswork.

Fairfield runs +1.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.