Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Grand Isle features a humid continental climate (Dfb).Temperatures typically range between -11 °C (13 °F) and 19 °C (66 °F) through the year, but rarely can drop to -32 °C (-24 °F) or can rise to as high as 33 °C (92 °F).The average annual precipitation amounts to about 1166 mm (45.9 inches) and receives 141 rainy days on the 1 mm (0.04 inches) threshold annually.Grand Isle enjoys an average of 2764 hours of sunshine throughout the year, and daylight varies from 8 hours 30 minutes to 15 hours 52 minutes per day.
The warmest months in Grand Isle are June, July and August, with daily mean temperatures ranging from 15 to 19 °C (60 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -11 to -8 °C (13 - 18 °F) throughout the day. On average each year, Grand Isle experiences 25 days above 25 °C (77.0 °F) and 162 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 9°C (49°F) | 6°C (44°F) | 16°C (60°F) | 19°C (66°F) | 31°C (88°F) | 33°C (92°F) | 32°C (90°F) | 31°C (88°F) | 28°C (82°F) | 21°C (71°F) | 21°C (69°F) | 14°C (57°F) |
Mean maximum | 4°C (39°F) | 6°C (42°F) | 9°C (48°F) | 16°C (61°F) | 27°C (81°F) | 27°C (81°F) | 29°C (85°F) | 28°C (84°F) | 26°C (79°F) | 19°C (67°F) | 15°C (60°F) | 9°C (48°F) |
Average high | -6°C (21°F) | -5°C (23°F) | -0°C (32°F) | 7°C (45°F) | 16°C (61°F) | 20°C (69°F) | 24°C (75°F) | 23°C (74°F) | 18°C (65°F) | 11°C (52°F) | 3°C (37°F) | -4°C (25°F) |
Daily mean | -11°C (13°F) | -9°C (15°F) | -5°C (24°F) | 3°C (37°F) | 10°C (51°F) | 15°C (60°F) | 19°C (66°F) | 18°C (65°F) | 13°C (56°F) | 7°C (45°F) | -1°C (31°F) | -8°C (18°F) |
Average low | -15°C (6°F) | -14°C (7°F) | -9°C (16°F) | -2°C (29°F) | 5°C (41°F) | 10°C (50°F) | 14°C (57°F) | 13°C (56°F) | 8°C (47°F) | 3°C (38°F) | -5°C (24°F) | -12°C (10°F) |
Mean minimum | -26°C (-14°F) | -25°C (-13°F) | -21°C (-5°F) | -9°C (16°F) | -2°C (29°F) | 3°C (38°F) | 8°C (46°F) | 6°C (44°F) | 1°C (34°F) | -4°C (25°F) | -16°C (3°F) | -23°C (-9°F) |
Minimum | -32°C (-24°F) | -27°C (-16°F) | -24°C (-12°F) | -13°C (8°F) | -4°C (26°F) | 0°C (33°F) | 5°C (42°F) | 5°C (42°F) | -2°C (28°F) | -9°C (17°F) | -19°C (-1°F) | -26°C (-14°F) |
Compare temperature, precipitation, sunshine, UV index in Grand Isle, Maine, United States with other places around the world.
Grand Isle usually has the most precipitation in April, October and November, with an average of 12 rainy days and 119 mm (4.7 inches) of precipitation per month.The driest months in Grand Isle are February, March and August. On average, 78 mm (3.1 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 89 (3.5) | 74 (2.9) | 77 (3.0) | 119 (4.7) | 97 (3.8) | 92 (3.6) | 93 (3.7) | 84 (3.3) | 100 (3.9) | 121 (4.7) | 119 (4.7) | 102 (4.0) |
Average precipitation days (≥ 1 mm) | 9 | 11 | 10 | 14 | 14 | 13 | 13 | 11 | 11 | 12 | 12 | 11 |
The sunniest months in Grand Isle are June, July and August, when the sun shines an average of 10 hours 46 minutes a day.Least sunny months in Grand Isle: January, November and December receive an average of 4 hours 31 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 116 | 180 | 231 | 223 | 284 | 320 | 341 | 329 | 255 | 182 | 151 | 147 |
Mean daily daylight hours | 8h 56m | 10h 16m | 11h 56m | 13h 39m | 15h 7m | 15h 52m | 15h 27m | 14h 8m | 12h 30m | 10h 48m | 9h 17m | 8h 30m |
Grand Isle experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 8 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Grand Isle UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 2 | 3 | 5 | 7 | 8 | 10 | 8 | 8 | 7 | 4 | 3 | 2 |