Boston, Massachusetts December 2021 Average Temperature Rankings
1991-2020
Degrees Fahrenheit
1
39.3
35.8
3.5
81
8
1989
2015
2020
2015
top-tenth
1998
2
42.0
40.3
1.7
76
13
1989
2015
2019
2020
top-third
1998
3
48.0
45.2
2.8
83
6
1976
2011,2015
2020
2015
top-tenth
4
53.4
50.3
3.1
86
3
1976
2015
2020
2015
top-tenth
5
58.1
54.8
3.3
87
2
1976
2015
2020
2015
top-tenth
6
60.5
58.1
2.4
85
4
1962
2011
2020
2015
top-tenth
7
62.5
59.5
3.0
88
1
1962
2021
2020
2021
highest
8
62.3
59.4
2.9
88
1
1962
2021
2020
2021
highest
9
61.0
58.2
2.8
88
1
1940
2021
2020
2021
highest
10
59.1
56.2
2.9
88
1
1940
2021
2020
2021
highest
11
56.6
54.0
2.6
88
1
1940,1967
2021
2020
2021
highest
12
54.6
52.0
2.6
88
1
1940
2021
2020
2021
highest
18
56.4
54.0
2.4
85
3
1940
2012,2023
2020
2012
top-tenth
24
54.4
52.0
2.4
87
1
1940
2021
2020
2021
highest
36
53.5
51.9
1.6
83
4
1940
2023
2020
2012
top-tenth
48
53.3
51.9
1.4
83
3
1942,1943
2023
2020
2013
top-tenth
2013
60
53.1
51.9
1.2
82
3
1943
2023
2020
2021
top-tenth