United States · 1991–2020

Best time to visit
Thornton.

August leads for comfortable weather in Thornton: typically 25.8°C by day, 10.9°C at night, with 93 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high25.8°C

Typical low10.9°C

Rain in August93 mm

Comfort

August

August · June · July

74climate match

Beach

July

July · August · June

46climate match

Outdoors

September

September · May · June

73climate match

The weakest month is January, scoring 5 against August’s 74 — days reach only -2.1°C, 26° below the 24°C the score treats as ideal, and nights drop to -14.4°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

5-2.1° / -14.4°

Feb

50.3° / -14.1°

Mar

54.8° / -8.2°

Apr

1912.4° / -2.1°

May

4919.2° / 3.5°

Jun

7324.4° / 9.2°

Jul

6926.5° / 11.9°

Aug

7425.8° / 10.9°

Sep

6321.5° / 6.4°

Oct

2614.3° / 0.1°

Nov

57.5° / -3.9°

Dec

51.5° / -9.8°

Monthly climate evidence for Thornton — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.1°C	-14.4°C	86 mm	9.6	9 h 14	5	Good coverage
February	0.3°C	-14.1°C	61 mm	7	10 h 24	5	Good coverage
March	4.8°C	-8.2°C	84 mm	8.4	11 h 47	5	Good coverage
April	12.4°C	-2.1°C	86 mm	8.5	13 h 22	19	Good coverage
May	19.2°C	3.5°C	90 mm	9.9	14 h 43	49	Good coverage
June	24.4°C	9.2°C	98 mm	10.3	15 h 27	73	Good coverage
July	26.5°C	11.9°C	114 mm	10.1	15 h 09	69	Good coverage
August	25.8°C	10.9°C	93 mm	8.8	14 h	74	Good coverage
September	21.5°C	6.4°C	92 mm	8.4	12 h 27	63	Good coverage
October	14.3°C	0.1°C	111 mm	8.6	10 h 55	26	Good coverage
November	7.5°C	-3.9°C	98 mm	9.1	9 h 35	5	Good coverage
December	1.5°C	-9.8°C	87 mm	8.9	8 h 55	5	Good coverage

Records at PLYMOUTH, 1951–2007
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C23 Jan 1957	-37.2°C21 Jan 1994	67 mm27 Jan 1986	187 mm1958 · driest 15 mm in 1981	55
February	17.2°C27 Feb 1957	-33.3°C7 Feb 1993	59 mm25 Feb 1981	258 mm1981 · driest 7 mm in 1987	55
March	26.1°C31 Mar 1998	-28.9°C11 Mar 1987	59 mm14 Mar 1977	200 mm1953 · driest 15 mm in 1965	55
April	33.3°C20 Apr 1976	-16.1°C1 Apr 1969	95 mm29 Apr 1988	171 mm1996 · driest 14 mm in 1999	55
May	33.9°C23 May 1977	-7.8°C17 May 2002	84 mm14 May 2006	280 mm1954 · driest 23 mm in 1977	55
June	35.6°C26 Jun 1952	-5.6°C5 Jun 2002	58 mm3 Jun 2001	243 mm1998 · driest 7 mm in 1953	57
July	36.7°C23 Jul 1952	0.6°C3 Jul 1957	86 mm5 Jul 1973	229 mm1972 · driest 12 mm in 1985	53
August	36.7°C31 Aug 1964	-1.7°C31 Aug 1965	100 mm8 Aug 1990	281 mm1990 · driest 12 mm in 1996	54
September	35.0°C10 Sep 2002	-5.6°C30 Sep 2000	102 mm17 Sep 1999	209 mm1999 · driest 27 mm in 1984	55
October	31.1°C8 Oct 1963	-9.4°C14 Oct 1958	96 mm9 Oct 2005	289 mm2005 · driest 27 mm in 1994	55
November	22.8°C20 Nov 1953	-20.6°C25 Nov 1989	64 mm8 Nov 1963	221 mm1983 · driest 44 mm in 2001	56
December	18.3°C5 Dec 1982	-30.6°C17 Dec 1951	68 mm12 Dec 1952	237 mm1973 · driest 20 mm in 1960	56

Typical days per month at PLYMOUTH, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	3	9
February	0	0	28	2	6
March	<1	0	30	3	6
April	1	<1	22	3	2
May	6	1	8	3	0
June	16	4	<1	4	0
July	22	6	0	4	0
August	20	4	0	3	0
September	8	<1	4	3	0
October	1	0	18	3	<1
November	0	0	25	4	2
December	0	0	30	3	6

How often, not how much — every day in PLYMOUTH’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%	29%	10%	33%	-5.9–0.2°C
February	0%	25%	9%	26%	-3.0–2.7°C
March	<1%	27%	10%	30%	2.8–6.7°C
April	10%	29%	10%	34%	9.6–14.6°C
May	36%	33%	12%	44%	16.3–21.8°C
June	59%	33%	11%	40%	22.1–26.1°C
July	68%	30%	11%	36%	24.8–28.2°C
August	69%	29%	9%	29%	24.2–27.1°C
September	47%	27%	9%	29%	19.0–23.1°C
October	16%	27%	9%	34%	12.0–17.1°C
November	<1%	33%	12%	41%	4.9–9.6°C
December	0%	27%	11%	32%	-3.1–2.7°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.

1952Each stripe is one year’s mean temperature against the 50-year average. Warmest: 1952. Coolest: 1978.2006

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5093630
NOAA station: USC00276945 · PLYMOUTH
Station distance: 12.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 15 usable years
Daylight: Calculated from latitude 43.89°, 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 PLYMOUTH is what differs

Plymouth→Holderness→Rumney→Ashland→Woodstock→Center Harbor→

Or put two places side by side: Thornton vs Plymouth

Best time to visitThornton.