Climatological Data
Copyright © 1996-2010 STORMFAX, Inc.
Weather in Hyannis at this hour !
Weather in Hyannis the past 48 hours !
Hyannis Port
Hyannis Harbor WebCam
Hyannis, MA
NWS/1971-2000 
AVERAGE TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 49.5 °F |
29.2 |
30.0 |
36.6 |
45.0 |
54.9 |
64.3 |
70.5 |
69.7 |
62.9 |
52.5 |
44.1 |
34.7 |
AVERAGE HIGH TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 57.0 °F |
37.2 |
37.8 |
43.8 |
52.0 |
62.0 |
71.5 |
77.8 |
76.8 |
70.5 |
60.5 |
51.4 |
42.4 |
AVERAGE LOW TEMPERATURE
| Year | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 42.1 °F |
21.2 |
22.1 |
29.3 |
37.9 |
47.8 |
57.1 |
63.2 |
62.6 |
55.3 |
44.4 |
36.7 |
27.0 |
HIGHEST RECORDED TEMPERATURE (All-Time)
| Ever | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 100 °F | 65 | 62 | 73 | 81 | 93 | 97 | 98 | 100 | 95 | 83 | 73 | 65 |
LOWEST RECORDED TEMPERATURE (All-Time)
| Ever | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| -12 °F | -8 | -12 | 2 | 9 | 25 | 31 | 43 | 39 | 26 | 21 | 11 | -9 |
AVERAGE PRECIPITATION (Inches)
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 43.03" |
4.06 |
3.29 |
3.94 |
3.76 |
3.23 |
3.21 |
2.81 |
3.50 |
3.33 |
3.91 |
3.87 |
4.12 |
AVERAGE DAYS of PRECIPITATION
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 77 days | 8 | 7 | 7 | 7 | 6 | 6 | 5 | 7 | 5 | 6 | 6 | 7 |
NORMAL HEATING DEGREE DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 6026 |
1110 |
982 |
882 |
601 |
314 |
69 |
4 |
8 |
97 |
391 |
628 |
940 |
NORMAL COOLING DEGREE DAYS
| Total | Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
| 413 |
0 |
0 |
0 |
0 |
0 |
48 |
176 |
155 |
33 |
1 |
0 |
0 |
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