New Haven vs Islip: which is sunnier?
🇺🇸 United States vs 🇺🇸 United States · 55 km apart · long-term climate normals (NASA POWER, 2001–2020)
New Haven and Islip are virtually tied for annual sunshine — about 2,191 vs 2,252 hours a year. New Haven has the higher Sunshine Score in 3 of 12 months, Islip in 1 (8 within 2 points).
Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.
.jpg/500px-New_Haven%2C_Connecticut_skyline_(cropped).jpg)
At a glance
| New Haven | Islip | |
|---|---|---|
| Sunshine hours / year | 2,191 | 2,252 |
| Sunniest month | May (74/100) | July (75/100) |
| Nov–Feb average score | 5/100 | 6/100 |
| Jun–Aug average score | 72/100 | 73/100 |
| Rain / year | 1,209 mm | 1,206 mm |
| Warmest sea | 24°C / 75°F | 23°C / 73°F |
| Peak midday UV | 7 (high) | 7 (high) |
New Haven vs Islip month by month
| Month | Sunshine Score | Day high °C | Rain mm | Sea °C | ||||
|---|---|---|---|---|---|---|---|---|
| New Haven | Islip | New Haven | Islip | New Haven | Islip | New Haven | Islip | |
| January | 0 | 0 | 2° | 3° | 76 | 81 | 5° | 5° |
| February | 0 | 0 | 3° | 3° | 81 | 85 | 4° | 4° |
| March | 0 | 0 | 8° | 6° | 97 | 105 | 6° | 6° |
| April | 42 | 24 | 15° | 12° | 105 | 106 | 9° | 9° |
| May | 74 | 56 | 21° | 17° | 95 | 94 | 15° | 14° |
| June | 70 | 72 | 26° | 23° | 118 | 110 | 20° | 19° |
| July | 73 | 75 | 30° | 27° | 101 | 95 | 24° | 23° |
| August | 72 | 73 | 29° | 27° | 109 | 103 | 24° | 23° |
| September | 72 | 74 | 25° | 24° | 106 | 99 | 22° | 23° |
| October | 58 | 52 | 18° | 17° | 121 | 120 | 18° | 18° |
| November | 19 | 25 | 11° | 12° | 89 | 90 | 13° | 14° |
| December | 0 | 0 | 5° | 6° | 111 | 118 | 7° | 8° |
The sunnier month by month: Jan even · Feb even · Mar even · Apr New Haven · May New Haven · Jun even · Jul even · Aug even · Sep even · Oct New Haven · Nov Islip · Dec even.
When to pick which
- November–February: too close to call — New Haven averages 5/100, Islip 6/100. Daytime highs are similar (5°C vs 6°C). See the winter sun ranking.
- March–May: New Haven (average score 39/100 vs 27). New Haven is the warmer, around 15°C daytime highs vs 12°C.
- June–August: too close to call — New Haven averages 72/100, Islip 73/100. New Haven is the warmer, around 28°C daytime highs vs 26°C.
- September–October: too close to call — New Haven averages 65/100, Islip 63/100. Daytime highs are similar (22°C vs 21°C).
Sea temperature
New Haven's sea gets warmer: 24°C / 75°F at its peak vs 23°C. Swimmable water (21°C+): New Haven about 3 months a year, Islip about 3 months a year. Month-by-month sea temperatures are in the table above.
Full month-by-month guides: New Haven weather by month · Islip weather by month · Best time to visit United States.
More comparisons: New Haven vs Hartford · New Haven vs Albany · New Haven vs White Plains · Islip vs New York · Islip vs White Plains · all head-to-heads