Climate
Block Island's weather is greatly influenced by the surrounding ocean and prevailing winds that generally blow offshore. The climate is oceanic (Koppen Cfb), a rarity on an east coast in the Northern Hemisphere. Because the ocean stays cold during the Spring and Summer months, Block Island stays cooler than the mainland during this period. However, summers can still be hot on Block Island although July and August average in the mid and upper 70s instead of low and mid 80s that New York and southern New England experience. Block Island's record high temperature is 95 °F (35 °C). Block Island stays warmer than the mainland during the fall and winter months when the ocean remains relatively warmer than the mainland. Block Island's record low is −7 °F (−22 °C).
Block Island's High and Low Temperature Averages and Precipitation Averages:
| Climate data for Block Island, Rhode Island | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 44.7 (7.1) |
46.4 (8.0) |
50.3 (10.2) |
61.2 (16.2) |
65.8 (18.8) |
75.2 (24.0) |
82.2 (27.9) |
80.7 (27.1) |
75.3 (24.1) |
66.4 (19.1) |
57.5 (14.2) |
51.2 (10.7) |
82.2 (27.9) |
| Average high °F (°C) | 38.9 (3.8) |
39.6 (4.2) |
45.0 (7.2) |
53.2 (11.8) |
62.3 (16.8) |
71.3 (21.8) |
77.4 (25.2) |
77.2 (25.1) |
70.8 (21.6) |
61.7 (16.5) |
52.9 (11.6) |
44.1 (6.7) |
57.9 (14.4) |
| Average low °F (°C) | 26.7 (−2.9) |
28.1 (−2.2) |
33.2 (0.7) |
40.5 (4.7) |
49.2 (9.6) |
57.8 (14.3) |
63.9 (17.7) |
63.9 (17.7) |
57.4 (14.1) |
48.7 (9.3) |
40.8 (4.9) |
31.5 (−0.3) |
45.1 (7.3) |
| Record low °F (°C) | 17.6 (−8.0) |
17.8 (−7.9) |
28.5 (−1.9) |
36.7 (2.6) |
46.0 (7.8) |
55.5 (13.1) |
60.5 (15.8) |
60.2 (15.7) |
53.5 (11.9) |
43.4 (6.3) |
34.7 (1.5) |
19.7 (−6.8) |
17.6 (−8.0) |
| Precipitation inches (mm) | 3.68 (93.5) |
3.04 (77.2) |
3.99 (101.3) |
3.72 (94.5) |
3.40 (86.4) |
2.77 (70.4) |
2.62 (66.5) |
3.00 (76.2) |
3.19 (81) |
3.04 (77.2) |
3.77 (95.8) |
3.57 (90.7) |
39.79 (1,010.7) |
| Snowfall inches (cm) | 6.1 (15.5) |
6.3 (16) |
5.4 (13.7) |
0.4 (1) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.2 (0.5) |
2.8 (7.1) |
21.2 (53.8) |
| Avg. precipitation days (≥ 0.01 in) | 10 | 9 | 11 | 10 | 10 | 8 | 7 | 8 | 7 | 8 | 10 | 11 | 109 |
| Source: Weatherbase | |||||||||||||
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