42.361°N, 71.010°W · station BOSthr · 1872–2026 · 155 years of record
The Almanac Ribbon
Every day of the year at Boston: the record high and record low ever set (outer lines), the everyday normal range (shaded band), and the full record envelope behind it.
Record highRecord lowNormal high–low band (1991–2020)hottest ever 104°F · coldest ever -18°F
Records by Month
Month
Record high
Record low
Jan
74°Jan 12, 2020
-13°Jan 24, 1882
Feb
73°Feb 24, 2017
-18°Feb 9, 1934
Mar
89°Mar 31, 1998
-8°Mar 6, 1872
Apr
94°Apr 18, 1976
11°Apr 5, 1874
May
97°May 26, 1880
31°May 3, 1882
Jun
102°Jun 24, 2025
41°Jun 1, 1945
Jul
104°Jul 4, 1911
50°Jul 6, 1879
Aug
102°Aug 2, 1975
46°Aug 25, 1940
Sep
102°Sep 7, 1881
34°Sep 26, 1879
Oct
90°Oct 1, 1881
25°Oct 26, 1879
Nov
83°Nov 2, 1950
-2°Nov 30, 1875
Dec
76°Dec 7, 1998
-17°Dec 29, 1933
All-time
104°Jul 4, 1911
-18°Feb 9, 1934
Longest-Standing Records
The daily records that have held the longest — set in the earliest years and never beaten since. Highs power Boston on hottestsince.com; lows on coldestsince.com.
Oldest-standing record highs
Date
Record
Set
Standing
Sep 8
95°
1872
154yrs
Sep 27
90°
1873
153yrs
Jan 1
70°
1876
150yrs
Mar 7
68°
1876
150yrs
Feb 7
56°
1878
148yrs
May 13
86°
1879
147yrs
May 31
96°
1879
147yrs
Oct 7
88°
1879
147yrs
Feb 29
64°
1880
146yrs
Mar 5
72°
1880
146yrs
May 26
97°
1880
146yrs
May 27
96°
1880
146yrs
Oldest-standing record lows
Date
Record
Set
Standing
Mar 5
-4°
1872
154yrs
Mar 6
-8°
1872
154yrs
Mar 7
2°
1872
154yrs
Mar 13
12°
1872
154yrs
Mar 16
10°
1872
154yrs
Mar 21
8°
1872
154yrs
Sep 4
43°
1872
154yrs
Dec 25
-8°
1872
154yrs
Dec 27
3°
1872
154yrs
Jan 30
-5°
1873
153yrs
Aug 23
50°
1873
153yrs
Oct 8
32°
1873
153yrs
All-Time Extremes
Hottest ever
104°F
1911-07-04
Coldest ever
-18°F
1934-02-09
Longest heat streak
9 days
≥ 90°F · ended 1912-07-11
The Warming Trend
Boston's annual mean temperature, each year a stripe — blue below the 1991–2020 average, red above.
Days Above / Below the Mark
16 days ≥90°F in 2026 · normal 12 · record 30 in 1983
70 days ≤32°F in 2026 · normal 101 · record 150 in 1875
The Full Record
Every day of the year, record and normal high & low with the year each record was set. Type to filter, click a column to sort.