Best Time to Dive Vermont
Across 8 Vermont dive sites with multi-year conditions history, July historically shows the most favorable days — 97% of sampled days in the good band. The next-highest months are September (96%), May (92%) and August (92%). April historically shows the fewest favorable days (84% of sampled days). These figures are historical climatology computed from measured conditions — patterns, not a forecast or a guarantee.
Computed from our own conditions climatology — measured history, not brochure copy.
Which months are historically most favorable in Vermont?
| Month | Historically favorable days | Water temp | Typical seas |
|---|---|---|---|
| Jan | 89% | — | — |
| Feb | 91% | — | — |
| Mar | 85% | — | — |
| Apr | 84% | — | — |
| May | 92% | — | — |
| Jun | 91% | — | — |
| Jul | 97% | — | — |
| Aug | 92% | — | — |
| Sep | 96% | — | — |
| Oct | 91% | — | — |
| Nov | 89% | — | — |
| Dec | 86% | — | — |
% = share of sampled days scoring in the favorable band, median across 8 dive sites with at least two years of history. Ringed = historical peak.
How does this compare worldwide? The Most Reliable Diving Months on Earth ranks 61 countries by the same measure.
Marine life seasons
Sighting patterns across the wider US & Canada — Atlantic coast region — not site-specific promises.
- Scalloped hammerheadAugust
- Great white sharkAug–Sep
- Giant oceanic manta rayJul–Sep
- OrcaMay–Aug
- Humpback whaleJun–Aug
Bars are Jan–Dec — months when sightings historically concentrate (GBIF occurrence records). Wildlife is never guaranteed.
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