United States · 1991–2020

Best time to visit
Boston.

April leads for comfortable weather in Boston: typically 24.6°C by day, 15.1°C at night, with 124 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high24.6°C

Typical low15.1°C

Rain in April124 mm

Comfort

April

April · March · October

83climate match

Beach

May

May · September · October

79climate match

Outdoors

March

March · November · February

80climate match

The weakest month is July, scoring 24 against April’s 83 — days average 32.7°C, 9° above the 24°C the score treats as ideal, and 202 mm of rain falls.

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

3716° / 5.8°

Feb

5518° / 8°

Mar

7521.4° / 11.6°

Apr

8324.6° / 15.1°

May

6428.5° / 19.9°

Jun

3531.6° / 23.2°

Jul

2432.7° / 23.9°

Aug

2933.1° / 23.5°

Sep

4631.2° / 21.4°

Oct

7527.1° / 15.8°

Nov

6821.4° / 10.4°

Dec

4917.3° / 7.1°

Monthly climate evidence for Boston — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 30 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	16°C	5.8°C	142 mm	8.6	14.7°C	10 h 25	37	Strong coverage
February	18°C	8°C	103 mm	6.2	15.5°C	11 h 05	55	Strong coverage
March	21.4°C	11.6°C	91 mm	5.9	18.5°C	11 h 54	75	Strong coverage
April	24.6°C	15.1°C	124 mm	5.4	22.0°C	12 h 51	83	Strong coverage
May	28.5°C	19.9°C	111 mm	5.5	25.7°C	13 h 38	64	Strong coverage
June	31.6°C	23.2°C	171 mm	10	28.9°C	14 h 03	35	Strong coverage
July	32.7°C	23.9°C	202 mm	12.4	29.9°C	13 h 53	24	Strong coverage
August	33.1°C	23.5°C	165 mm	11.5	30.0°C	13 h 13	29	Strong coverage
September	31.2°C	21.4°C	139 mm	8	28.5°C	12 h 18	46	Strong coverage
October	27.1°C	15.8°C	112 mm	5.4	24.6°C	11 h 24	75	Strong coverage
November	21.4°C	10.4°C	120 mm	6.2	19.9°C	10 h 37	68	Strong coverage
December	17.3°C	7.1°C	110 mm	7.4	16.6°C	10 h 14	49	Strong coverage

Records at LELAND BOWMAN LOCK, 1985–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.7°C3 Jan 2023	-9.4°C17 Jan 2018	158 mm5 Jan 1998	360 mm1998 · driest 26 mm in 2009	40
February	28.3°C28 Feb 2023	-7.2°C5 Feb 1996	107 mm19 Feb 2012	262 mm1992 · driest 19 mm in 1996	41
March	31.7°C18 Mar 2016	-3.9°C6 Mar 1989	102 mm14 Mar 1995	291 mm2001 · driest 1 mm in 2006	40
April	33.9°C5 Apr 2024	1.7°C13 Apr 2004	169 mm8 Apr 2003	455 mm2015 · driest 3 mm in 1999	40
May	36.7°C16 May 2018	8.9°C4 May 2013	160 mm4 May 2017	333 mm2017 · driest 0 mm in 2003	40
June	38.9°C20 Jun 2022	14.4°C24 Jun 2001	128 mm10 Jun 2001	469 mm1989 · driest 20 mm in 2006	41
July	39.4°C31 Jul 2015	14.4°C24 Jul 2000	155 mm14 Jul 2019	325 mm2011 · driest 44 mm in 2015	41
August	44.4°C19 Aug 2011	14.4°C28 Aug 2010	114 mm29 Aug 2017	456 mm2017 · driest 21 mm in 2023	40
September	38.9°C4 Sep 2000	3.9°C28 Sep 1996	140 mm14 Sep 2009	515 mm2018 · driest 15 mm in 2022	41
October	35.6°C2 Oct 1998	0.6°C31 Oct 1993	215 mm16 Oct 2018	428 mm2002 · driest 0 mm in 2005	41
November	31.1°C8 Nov 2022	-5.0°C13 Nov 2019	135 mm1 Nov 2015	372 mm2000 · driest 16 mm in 2017	41
December	28.3°C6 Dec 2022	-11.7°C23 Dec 1989	159 mm18 Dec 1995	361 mm2009 · driest 30 mm in 1991	41

Typical days per month at LELAND BOWMAN LOCK, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	<1	0	5	4
February	1	0	1	3
March	7	<1	<1	3
April	17	<1	0	3
May	28	10	0	3
June	30	25	0	5
July	30	28	0	6
August	31	28	0	5
September	28	23	0	4
October	24	7	0	3
November	8	<1	<1	3
December	2	0	2	3

How often, not how much — every day in LELAND BOWMAN LOCK’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	19%	28%	13%	30%	13.6–18.9°C
February	35%	23%	11%	21%	16.0–20.6°C
March	57%	19%	9%	15%	19.5–23.8°C
April	77%	17%	9%	12%	22.8–26.3°C
May	80%	20%	10%	22%	26.7–30.2°C
June	68%	32%	16%	41%	30.1–33.3°C
July	60%	40%	19%	58%	31.2–34.4°C
August	64%	37%	16%	49%	31.4–34.5°C
September	74%	26%	14%	29%	29.5–32.7°C
October	79%	17%	9%	18%	25.3–28.5°C
November	52%	21%	11%	19%	18.7–23.5°C
December	26%	23%	10%	22%	15.6–19.2°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.

1986Each stripe is one year’s mean temperature against the 33-year average. Warmest: 2023. Coolest: 1993.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4317656
NOAA station: USC00165296 · LELAND BOWMAN LOCK
Station distance: 18.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 29.88°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 30 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 LELAND BOWMAN LOCK is what differs

Abbeville→Kaplan→Bancker→Cheniere au Tigre→Esther→Forked Island→

Or put two places side by side: Boston vs Abbeville

Best time to visitBoston.

April

May

March

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Boston.

The whole year,
without the guesswork.

Nearby, measured,
and named.