United States · 1991–2020

Best time to visit
Collins.

July leads for comfortable weather in Collins: typically 25.8°C by day, 12°C at night, with 0 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high25.8°C

Typical low12°C

Rain in July0 mm

Comfort

July

July · August · June

88climate match

Beach

August

August · July · September

66climate match

Outdoors

April

April · May · October

90climate match

The weakest month is December, scoring 31 against July’s 88 — days reach only 14.1°C, 10° below the 24°C the score treats as ideal, and nights drop to 2.5°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

3314° / 2.8°

Feb

4016° / 3.6°

Mar

5218° / 4.7°

Apr

6819.8° / 5.7°

May

8322.7° / 8.1°

Jun

8625.7° / 10.5°

Jul

8825.8° / 12°

Aug

8726.3° / 11.9°

Sep

8226.9° / 10.1°

Oct

8623.9° / 7.2°

Nov

5818.2° / 4.2°

Dec

3114.1° / 2.5°

Monthly climate evidence for Collins — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	14°C	2.8°C	88 mm	7.9	9 h 47	33	Good coverage
February	16°C	3.6°C	94 mm	8.1	10 h 43	40	Good coverage
March	18°C	4.7°C	69 mm	7.9	11 h 50	52	Good coverage
April	19.8°C	5.7°C	34 mm	4.5	13 h 08	68	Good coverage
May	22.7°C	8.1°C	15 mm	2.3	14 h 13	83	Good coverage
June	25.7°C	10.5°C	4 mm	0.8	14 h 48	86	Good coverage
July	25.8°C	12°C	0 mm	0	14 h 34	88	Good coverage
August	26.3°C	11.9°C	0 mm	0.1	13 h 38	87	Good coverage
September	26.9°C	10.1°C	2 mm	0.3	12 h 23	82	Good coverage
October	23.9°C	7.2°C	24 mm	2.4	11 h 08	86	Good coverage
November	18.2°C	4.2°C	47 mm	5.1	10 h 03	58	Good coverage
December	14.1°C	2.5°C	97 mm	8.6	9 h 31	31	Good coverage

Records at NAPA CO AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.7°C18 Jan 2021	-7.8°C15 Jan 2007	62 mm6 Jan 2019	308 mm2017 · driest 0 mm in 2015	28
February	27.2°C5 Feb 2011	-6.0°C20 Feb 2018	54 mm27 Feb 2006	228 mm2019 · driest 0 mm in 2020	28
March	30.6°C20 Mar 2026	-2.8°C10 Mar 2009	42 mm10 Mar 2016	208 mm2023 · driest 1 mm in 2007	28
April	32.8°C21 Apr 2009	-3.9°C24 Apr 2008	60 mm6 Apr 2018	96 mm2018 · driest 0 mm in 2021	28
May	38.3°C15 May 2008	-0.6°C23 May 2010	28 mm19 May 2019	71 mm2019 · driest 0 mm in 2017	28
June	43.3°C14 Jun 2000	2.2°C6 Jun 2005	26 mm4 Jun 2011	56 mm2011 · driest 0 mm in 2010	29
July	41.1°C22 Jul 2006	6.1°C1 Jul 2007	1 mm9 Jul 2015	1 mm2015 · driest 0 mm in 2008	29
August	41.1°C14 Aug 2020	5.6°C31 Aug 2008	8 mm21 Aug 2003	8 mm2003 · driest 0 mm in 1999	28
September	46.1°C6 Sep 2022	1.7°C29 Sep 2019	21 mm21 Sep 2013	21 mm2013 · driest 0 mm in 2016	28
October	38.3°C15 Oct 2020	-1.1°C31 Oct 2002	122 mm24 Oct 2021	171 mm2021 · driest 0 mm in 2018	28
November	29.4°C14 Nov 2010	-5.6°C12 Nov 2000	48 mm1 Nov 2008	109 mm2001 · driest 16 mm in 2009	28
December	25.6°C19 Dec 1999	-8.8°C5 Dec 2013	81 mm11 Dec 2014	286 mm2005 · driest 2 mm in 2017	28

Typical days per month at NAPA CO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	9	3
February	<1	0	5	3
March	2	0	2	2
April	4	<1	1	1
May	8	2	0	<1
June	16	5	0	<1
July	17	5	0	0
August	18	5	0	0
September	19	8	0	0
October	13	4	<1	<1
November	2	0	5	2
December	<1	0	11	3

How often, not how much — every day in NAPA CO 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	4%	25%	9%	32%	12.1–15.8°C
February	15%	28%	11%	39%	14.4–18.2°C
March	30%	25%	8%	29%	15.5–20.3°C
April	45%	14%	4%	13%	18.2–21.2°C
May	76%	8%	1%	6%	20.2–24.9°C
June	95%	2%	<1%	<1%	23.6–27.3°C
July	100%	0%	0%	0%	24.6–27.5°C
August	99%	<1%	0%	0%	24.6–27.8°C
September	96%	2%	<1%	1%	25.0–28.8°C
October	80%	8%	3%	9%	22.0–26.0°C
November	28%	17%	6%	18%	16.4–19.8°C
December	2%	29%	12%	41%	12.3–16.3°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.

1999Each stripe is one year’s mean temperature against the 27-year average. Warmest: 2017. Coolest: 2011.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5338682
NOAA station: USW00093227 · NAPA CO AP
Station distance: 5.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 38.17°, 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 NAPA CO AP is what differs

American Canyon→Brazos→Buchli→Carneros (historical)→Chabot Terrace→Creston→

Or put two places side by side: Collins vs American Canyon

Best time to visitCollins.