United States · 1991–2020

Best time to visit
Darien.

September leads for comfortable weather in Darien: typically 23.7°C by day, 10.7°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.7°C

Typical low10.7°C

Rain in September96 mm

Comfort

September

September · August · July

79climate match

Beach

July

July · August · June

68climate match

Outdoors

May

May · September · October

76climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only -2.4°C, 26° 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

5-2.4° / -11.5°

Feb

5-0.7° / -10.3°

Mar

56.6° / -3.6°

Apr

3114.2° / 2.4°

May

6120.5° / 8.6°

Jun

7226° / 14.5°

Jul

7327.9° / 16.2°

Aug

7726.9° / 14.9°

Sep

7923.7° / 10.7°

Oct

4315.6° / 3.9°

Nov

118° / -1.7°

Dec

50.6° / -8.1°

Monthly climate evidence for Darien — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.4°C	-11.5°C	39 mm	5.8	9 h 22	5	Good coverage
February	-0.7°C	-10.3°C	38 mm	5.7	10 h 29	5	Good coverage
March	6.6°C	-3.6°C	55 mm	6.6	11 h 48	5	Good coverage
April	14.2°C	2.4°C	95 mm	8.9	13 h 19	31	Good coverage
May	20.5°C	8.6°C	105 mm	10	14 h 35	61	Good coverage
June	26°C	14.5°C	139 mm	9.1	15 h 17	72	Good coverage
July	27.9°C	16.2°C	95 mm	7.1	15 h 01	73	Good coverage
August	26.9°C	14.9°C	106 mm	7	13 h 55	77	Good coverage
September	23.7°C	10.7°C	96 mm	6.9	12 h 26	79	Good coverage
October	15.6°C	3.9°C	74 mm	7.1	10 h 58	43	Good coverage
November	8°C	-1.7°C	61 mm	5.8	9 h 42	11	Good coverage
December	0.6°C	-8.1°C	50 mm	6.1	9 h 04	5	Good coverage

Records at CLINTON WWTP, 2001–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.1°C7 Jan 2008	-33.3°C16 Jan 2009	45 mm2 Jan 2006	126 mm2005 · driest 3 mm in 2022	24
February	22.2°C28 Feb 2024	-29.4°C8 Feb 2021	32 mm24 Feb 2007	129 mm2008 · driest 5 mm in 2003	24
March	27.8°C22 Mar 2012	-27.2°C3 Mar 2002	100 mm12 Mar 2006	155 mm2006 · driest 12 mm in 2018	24
April	32.2°C18 Apr 2002	-10.0°C8 Apr 2003	69 mm18 Apr 2013	227 mm2026 · driest 28 mm in 2021	24
May	35.6°C28 May 2012	-5.6°C17 May 2002	51 mm8 May 2024	193 mm2004 · driest 14 mm in 2026	24
June	36.7°C29 Jun 2012	3.3°C12 Jun 2023	138 mm19 Jun 2018	357 mm2013 · driest 22 mm in 2012	24
July	38.9°C7 Jul 2012	7.2°C16 Jul 2014	81 mm11 Jul 2008	232 mm2017 · driest 14 mm in 2002	23
August	35.6°C31 Aug 2013	3.9°C31 Aug 2009	96 mm6 Aug 2007	413 mm2007 · driest 26 mm in 2003	22
September	35.0°C24 Sep 2017	-2.2°C30 Sep 2003	80 mm12 Sep 2019	260 mm2019 · driest 5 mm in 2017	24
October	31.7°C4 Oct 2025	-9.4°C16 Oct 2003	69 mm14 Oct 2023	153 mm2017 · driest 7 mm in 2005	25
November	23.9°C2 Nov 2016	-20.0°C12 Nov 2019	52 mm5 Nov 2005	148 mm2015 · driest 5 mm in 2007	25
December	18.9°C4 Dec 2012	-28.9°C19 Dec 2016	53 mm9 Dec 2003	156 mm2015 · driest 12 mm in 2017	25

Typical days per month at CLINTON WWTP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	1	6
February	0	0	26	2	6
March	<1	0	22	2	3
April	2	<1	10	3	<1
May	7	2	2	4	0
June	19	6	0	4	0
July	26	9	0	3	0
August	24	5	0	4	0
September	13	3	<1	3	0
October	3	<1	9	3	<1
November	0	0	19	2	1
December	0	0	27	2	4

How often, not how much — every day in CLINTON WWTP’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%	18%	3%	15%	-5.4–0.0°C
February	<1%	18%	3%	14%	-5.8–3.9°C
March	3%	22%	6%	24%	3.7–9.9°C
April	15%	31%	10%	38%	11.5–17.5°C
May	42%	30%	10%	36%	18.9–22.4°C
June	68%	29%	13%	34%	24.6–27.8°C
July	76%	25%	11%	25%	25.4–30.1°C
August	75%	24%	12%	23%	25.1–28.2°C
September	65%	23%	10%	24%	22.0–25.7°C
October	23%	23%	8%	26%	12.9–19.1°C
November	4%	20%	7%	16%	4.2–11.4°C
December	0%	20%	5%	18%	-2.9–3.8°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.

2002Each stripe is one year’s mean temperature against the 22-year average. Warmest: 2012. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5250104
NOAA station: USC00471667 · CLINTON WWTP
Station distance: 14.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 42.60°, 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 CLINTON WWTP is what differs

Poplar Grove→Clinton→Sharon→Beaverton Crossroads→Blaine→Hunter→

Or put two places side by side: Darien vs Poplar Grove

Best time to visitDarien.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Darien.

The whole year,
without the guesswork.

Nearby, measured,
and named.