United States · 1991–2020

Best time to visit
Thompsonville.

September leads for comfortable weather in Thompsonville: typically 24°C by day, 12.7°C at night, with 111 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24°C

Typical low12.7°C

Rain in September111 mm

Comfort

September

September · June · August

80climate match

Beach

July

July · August · September

72climate match

Outdoors

May

May · September · October

73climate match

The weakest month is January, scoring 5 against September’s 80 — days reach only 2.7°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

52.7° / -7°

Feb

54.2° / -6°

Mar

58.1° / -1.9°

Apr

2914.8° / 3.4°

May

6120.9° / 9.1°

Jun

6725.9° / 14.4°

Jul

6329.2° / 17.8°

Aug

6428.2° / 16.9°

Sep

8024° / 12.7°

Oct

4117.6° / 6°

Nov

1211.2° / 1.1°

Dec

55.8° / -3.4°

Monthly climate evidence for Thompsonville — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 26 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	2.7°C	-7°C	138 mm	11.7	4.9°C	9 h 24	5	Good coverage
February	4.2°C	-6°C	99 mm	9.8	3.3°C	10 h 30	5	Good coverage
March	8.1°C	-1.9°C	171 mm	12.7	3.5°C	11 h 48	5	Good coverage
April	14.8°C	3.4°C	128 mm	10.8	5.8°C	13 h 18	29	Good coverage
May	20.9°C	9.1°C	103 mm	12.1	10.1°C	14 h 34	61	Good coverage
June	25.9°C	14.4°C	153 mm	12.8	14.7°C	15 h 15	67	Good coverage
July	29.2°C	17.8°C	107 mm	8.8	18.2°C	14 h 59	63	Good coverage
August	28.2°C	16.9°C	132 mm	9.4	18.8°C	13 h 53	64	Good coverage
September	24°C	12.7°C	111 mm	8.4	17.0°C	12 h 26	80	Good coverage
October	17.6°C	6°C	140 mm	10.9	13.5°C	10 h 59	41	Good coverage
November	11.2°C	1.1°C	133 mm	10.5	10.2°C	9 h 43	12	Good coverage
December	5.8°C	-3.4°C	160 mm	11.3	7.5°C	9 h 06	5	Good coverage

What has changed

Thompsonville runs +0.6°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

+1.4

Feb

+1.1

Mar

+0.3

Apr

+0.7

May

-0.1

Jun

-0.3

Jul

+0.3

Aug

+0.3

Sep

+0.8

Oct

+0.4

Nov

+0.7

Dec

+1.9

September daytime highs, 2011–2025. Last recorded: 25.3°C.

Records at JAMAICA PLAIN, 1962–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C13 Jan 2020	-23.3°C22 Jan 1984	74 mm16 Jan 1983	309 mm1979 · driest 18 mm in 2025	59
February	23.3°C25 Feb 2017	-23.9°C4 Feb 2023	73 mm10 Feb 2013	227 mm1984 · driest 11 mm in 1987	59
March	31.7°C31 Mar 1977	-17.8°C19 Mar 1967	100 mm14 Mar 2010	443 mm2010 · driest 19 mm in 1981	59
April	35.0°C18 Apr 2002	-8.9°C1 Apr 1969	75 mm22 Apr 2000	312 mm1987 · driest 19 mm in 1963	60
May	37.2°C19 May 2017	-4.4°C7 May 2001	96 mm26 May 1967	215 mm1998 · driest 15 mm in 1964	58
June	39.4°C25 Jun 2025	3.3°C6 Jun 1964	182 mm14 Jun 1998	367 mm1982 · driest 0 mm in 1999	59
July	39.4°C22 Jul 1977	6.7°C1 Jul 1988	91 mm2 Jul 2021	350 mm2021 · driest 14 mm in 1997	59
August	37.8°C31 Aug 1973	2.8°C30 Aug 1965	105 mm1 Aug 1985	266 mm2011 · driest 21 mm in 1984	59
September	38.3°C1 Sep 1973	0.0°C22 Sep 1962	138 mm18 Sep 1996	265 mm1999 · driest 19 mm in 2014	61
October	33.3°C8 Oct 1963	-6.7°C19 Oct 1974	145 mm6 Oct 1962	273 mm2011 · driest 9 mm in 1994	59
November	28.3°C7 Nov 2024	-14.4°C24 Nov 1989	92 mm30 Nov 1963	263 mm1963 · driest 19 mm in 1976	59
December	25.6°C8 Dec 1998	-23.3°C26 Dec 1980	115 mm27 Dec 1969	258 mm1969 · driest 20 mm in 1988	61

Typical days per month at JAMAICA PLAIN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	3	5
February	0	0	24	3	4
March	<1	0	20	4	3
April	2	<1	7	3	<1
May	8	2	<1	3	0
June	18	7	0	3	0
July	26	15	0	3	0
August	25	11	0	3	0
September	13	3	0	3	0
October	2	0	3	3	<1
November	<1	0	14	3	<1
December	0	0	24	4	3

How often, not how much — every day in JAMAICA PLAIN’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%	31%	13%	30%	-0.7–5.2°C
February	<1%	32%	14%	33%	1.5–6.9°C
March	3%	34%	14%	36%	5.8–11.0°C
April	14%	34%	12%	37%	12.7–16.7°C
May	41%	35%	11%	38%	19.0–23.4°C
June	61%	35%	11%	39%	24.1–27.8°C
July	70%	30%	12%	28%	27.7–31.0°C
August	70%	30%	11%	24%	26.7–30.2°C
September	61%	28%	11%	26%	22.2–25.6°C
October	27%	29%	11%	29%	15.7–19.7°C
November	5%	33%	13%	38%	8.8–14.2°C
December	<1%	35%	15%	37%	2.5–7.9°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.

1963Each stripe is one year’s mean temperature against the 56-year average. Warmest: 2024. Coolest: 1992.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4952956
NOAA station: USC00193890 · JAMAICA PLAIN
Station distance: 5.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 42.32°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 26 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 JAMAICA PLAIN is what differs

Dorchester→Newton→Brookline→Brighton→Fenway/Kenmore→Jamaica Plain→

Or put two places side by side: Thompsonville vs Dorchester

Best time to visitThompsonville.

September

July

May

The whole year,without the guesswork.

Thompsonville runs +0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Thompsonville.

The whole year,
without the guesswork.

Thompsonville runs +0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.