Mid-July through mid-August for warm weather; mid-September through mid-October for fall foliage with smaller crowds. Summer offers peak warmth (avg high ~78°F in July) and full festival and ferry schedules; fall delivers dramatic foliage with fewer crowds and comfortable temperatures (avg high ~63°F in October). U.S. News Travel identifies summer as prime season with fall as the best alternative for avoiding peak congestion
| Month | High (°F) | Low (°F) | Notes |
|---|---|---|---|
| Jan | 32 | 19 | crisp & changeable |
| Feb | 34 | 20 | crisp & changeable |
| Mar | 41 | 27 | crisp & changeable |
| Apr | 52 | 38 | cool & changeable |
| May | 61 | 48 | mild & changeable |
| Jun | 70 | 57 | mild & changeable |
| Jul | 76 | 64 | warm & changeable |
| Aug | 75 | 64 | warm & changeable |
| Sep | 69 | 58 | mild & changeable |
| Oct | 58 | 48 | cool & changeable |
| Nov | 47 | 36 | cool & changeable |
| Dec | 38 | 27 | crisp & changeable |