United States · 1991–2020

Best time to visit
Blue Hills.

June leads for comfortable weather in Blue Hills: typically 24.3°C by day, 13.9°C at night, with 118 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.3°C

Typical low13.9°C

Rain in June118 mm

Comfort

June

June · September · August

79climate match

Beach

July

July · August · June

72climate match

Outdoors

May

May · September · October

77climate match

The weakest month is January, scoring 5 against June’s 79 — days reach only 1.6°C, 22° 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

51.6° / -6.8°

Feb

53.1° / -5.9°

Mar

57.1° / -2.2°

Apr

2713.7° / 3.3°

May

5919.6° / 8.8°

Jun

7924.3° / 13.9°

Jul

7227.6° / 17.4°

Aug

7426.8° / 16.8°

Sep

7722.4° / 12.9°

Oct

4016° / 7°

Nov

1410° / 1.6°

Dec

54.5° / -3.3°

Monthly climate evidence for Blue Hills — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 24 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.6°C	-6.8°C	114 mm	9.9	4.9°C	9 h 24	5	Strong coverage
February	3.1°C	-5.9°C	103 mm	8.9	3.3°C	10 h 30	5	Strong coverage
March	7.1°C	-2.2°C	141 mm	10.2	3.5°C	11 h 48	5	Strong coverage
April	13.7°C	3.3°C	119 mm	9.8	5.8°C	13 h 18	27	Strong coverage
May	19.6°C	8.8°C	98 mm	10.2	10.1°C	14 h 33	59	Strong coverage
June	24.3°C	13.9°C	118 mm	9.6	14.7°C	15 h 15	79	Strong coverage
July	27.6°C	17.4°C	88 mm	7.8	18.2°C	14 h 59	72	Strong coverage
August	26.8°C	16.8°C	98 mm	7.8	18.8°C	13 h 53	74	Strong coverage
September	22.4°C	12.9°C	108 mm	7.4	17.0°C	12 h 26	77	Strong coverage
October	16°C	7°C	135 mm	8.8	13.5°C	10 h 59	40	Strong coverage
November	10°C	1.6°C	110 mm	9.1	10.2°C	9 h 44	14	Strong coverage
December	4.5°C	-3.3°C	136 mm	10.2	7.5°C	9 h 06	5	Strong coverage

What has changed

Blue Hills runs +1.3°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

+1.5

Feb

+1.8

Mar

+1.1

Apr

+1.0

May

+0.9

Jun

+0.6

Jul

+1.3

Aug

+1.5

Sep

+1.5

Oct

+1.0

Nov

+1.0

Dec

+2.2

June daytime highs, 2011–2025. Last recorded: 25.8°C.

Records at BLUE HILL LCD, 1959–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C12 Jan 2020	-23.9°C16 Jan 2004	63 mm21 Jan 1979	295 mm1979 · driest 25 mm in 1980	67
February	21.7°C24 Feb 2017	-25.6°C4 Feb 2023	79 mm24 Feb 1969	237 mm1969 · driest 18 mm in 1987	67
March	31.7°C31 Mar 1998	-18.9°C19 Mar 1967	143 mm18 Mar 1968	478 mm2010 · driest 8 mm in 2006	67
April	34.4°C19 Apr 1976	-10.6°C7 Apr 1982	88 mm1 Apr 2004	264 mm1987 · driest 30 mm in 1999	67
May	35.6°C18 May 2017	-1.7°C1 May 1978	128 mm31 May 1984	257 mm2006 · driest 16 mm in 1964	67
June	37.2°C24 Jun 2025	3.9°C3 Jun 1986	154 mm13 Jun 1998	440 mm1998 · driest 4 mm in 1999	68
July	37.8°C21 Jul 1977	6.7°C1 Jul 1988	102 mm27 Jul 1979	295 mm2021 · driest 18 mm in 1968	68
August	38.3°C2 Aug 1975	3.9°C30 Aug 1965	80 mm11 Aug 1990	227 mm1976 · driest 14 mm in 1981	67
September	36.1°C8 Sep 2015	-0.6°C30 Sep 1992	142 mm10 Sep 1999	314 mm1999 · driest 10 mm in 2014	67
October	31.1°C7 Oct 1963	-5.6°C27 Oct 1976	180 mm20 Oct 1996	374 mm2005 · driest 10 mm in 1994	67
November	26.7°C6 Nov 2024	-12.8°C23 Nov 2018	79 mm25 Nov 1983	262 mm2018 · driest 14 mm in 1976	67
December	23.3°C7 Dec 1998	-24.4°C26 Dec 1980	100 mm12 Dec 1992	320 mm1969 · driest 29 mm in 1989	67

Typical days per month at BLUE HILL LCD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	4	8
February	0	0	25	3	7
March	<1	<1	22	4	6
April	1	<1	6	4	1
May	6	2	<1	3	0
June	15	4	0	3	0
July	25	9	0	3	0
August	23	7	0	3	0
September	9	1	0	3	0
October	1	0	2	4	<1
November	0	0	13	4	1
December	0	0	24	4	5

How often, not how much — every day in BLUE HILL LCD’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%	32%	12%	38%	-2.0–4.2°C
February	<1%	30%	12%	37%	-0.2–5.8°C
March	3%	32%	13%	40%	4.4–9.8°C
April	12%	32%	12%	41%	11.1–15.4°C
May	40%	32%	10%	39%	17.5–21.8°C
June	63%	31%	10%	37%	22.2–26.0°C
July	74%	25%	10%	24%	25.1–29.1°C
August	73%	26%	10%	25%	24.9–28.0°C
September	54%	25%	10%	27%	20.5–23.7°C
October	19%	26%	11%	30%	14.2–18.2°C
November	3%	30%	13%	36%	7.5–12.5°C
December	<1%	32%	13%	43%	1.1–6.6°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.

1960Each stripe is one year’s mean temperature against the 66-year average. Warmest: 2012. Coolest: 1972.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4930850
NOAA station: USW00014753 · BLUE HILL LCD
Station distance: 3.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 42.24°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 24 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 BLUE HILL LCD is what differs

Randolph→Milton Center→Ashcroft→East Dedham→East Milton→Endicott→

Or put two places side by side: Blue Hills vs Randolph

Best time to visitBlue Hills.

June

July

May

The whole year,without the guesswork.

Blue Hills runs +1.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Blue Hills.

The whole year,
without the guesswork.

Blue Hills runs +1.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.