Annual mean
Annual mean of daily highs
Annual mean of daily lows
Grand Isle CDP, Maine
Official LSAD Designation: Grand Isle CDP • Census GEOID: 2328555
• Aroostook County
Climate Normals & Weather Observations
30-year climate normals (1991–2020) and weather observations for Grand Isle CDP.
Reference Weather Station: FRENCHVILLE AROOSTOOK AP, ME US (ID: USW00004836)
• Located 7.4 miles from community center
• Elevation: 301.1 m
| Month | Average High (°F) | Average Low (°F) | Mean Temp (°F) | Precipitation (in) |
|---|---|---|---|---|
| January | 19.4° | 3.2° | 11.3° | 1.51" |
| February | 22.3° | 5.7° | 14.0° | 0.87" |
| March | 32.6° | 16.4° | 24.5° | 1.47" |
| April | 45.7° | 29.7° | 37.7° | 2.35" |
| May | 61.7° | 41.7° | 51.7° | 3.07" |
| June | 70.7° | 50.9° | 60.8° | 4.23" |
| July | 75.5° | 56.8° | 66.1° | 3.88" |
| August | 74.3° | 54.8° | 64.6° | 3.77" |
| September | 65.6° | 46.6° | 56.1° | 3.46" |
| October | 51.3° | 36.3° | 43.8° | 3.46" |
| November | 37.9° | 25.7° | 31.8° | 2.58" |
| December | 25.8° | 12.8° | 19.3° | 2.27" |
Annual Temperature History
2010–2025, completed calendar years only.
NOAA station FRENCHVILLE AROOSTOOK AP, ME US (ID: USW00004836) • 7.4 miles from community center .
This is the same reference station used for monthly normals.
Source: NOAA NCEI Global Summary of the Year.
Annual temperature data table (°F)
| Year | Annual mean (°F) | Annual mean of daily highs (°F) | Annual mean of daily lows (°F) |
|---|---|---|---|
| 2010 | 42.4 | 50.4 | 34.4 |
| 2011 | 39.4 | 47.6 | 31.2 |
| 2012 | 40.9 | 49.6 | 32.2 |
| 2013 | 39.0 | 47.4 | 30.5 |
| 2014 | 37.7 | 46.0 | 29.5 |
| 2015 | 38.4 | 47.1 | 29.8 |
| 2016 | 40.4 | 49.2 | 31.6 |
| 2017 | 39.1 | 47.8 | 30.5 |
| 2018 | 40.4 | 49.0 | 31.7 |
| 2019 | 38.8 | 47.2 | 30.3 |
| 2020 | 40.9 | 49.8 | 32.1 |
| 2021 | 42.1 | 50.8 | 33.4 |
| 2022 | 40.7 | 49.6 | 31.9 |
| 2023 | 42.2 | 50.2 | 34.1 |
| 2024 | 43.5 | 52.1 | 34.9 |
| 2025 | 39.9 | 48.6 | 31.3 |
Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.