Port Sanilac, MI climate
Port Sanilac has chilly winters and pleasant summers. A typical July afternoon reaches 79°, a January night drops to 18°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Port Sanilac feels like
Winter
Spring
Summer
Fall
Port Sanilac weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 30° | 18° | 2.3" | 13° – 33° |
| February | 32° | 19° | 1.9" | 10° – 34° |
| March | 40° | 26° | 2.1" | 23° – 46° |
| April | 52° | 36° | 3.2" | 37° – 49° |
| May | 64° | 46° | 3.4" | 48° – 61° |
| June | 74° | 56° | 3.2" | 60° – 69° |
| July | 79° | 62° | 3.1" | 64° – 75° |
| August | 78° | 61° | 3.2" | 65° – 74° |
| September | 71° | 54° | 3.1" | 58° – 68° |
| October | 59° | 44° | 3.0" | 48° – 58° |
| November | 46° | 34° | 2.5" | 33° – 46° |
| December | 35° | 25° | 2.3" | 19° – 40° |
| Year | 55° | 40° | 33.0" |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Port Sanilac
Port Sanilac gets 33 inches of rain and melted snow a year. May is the wettest month and February the driest.
About 171 frost-free days a year
In half of years the last 32° night comes by May 4 and the first one by October 24. That leaves about 171 frost-free days for gardens, shorter than 59% of U.S. towns.
Heating and cooling a home in Port Sanilac
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Port Sanilac, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Port Sanilac and its neighbors
Port Sanilac borders 1 town with climate data. January nights across them vary by 1.0°. Sanilac has both the coldest January nights (17°) and the hottest July afternoons (80°). Port Sanilac’s January low is 18° and its July high 79°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Port Sanilac compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Port Sanilac averaged 1.6° warmer than the 1900s. The biggest change is in December (+2.8°). The shift is larger than in 74% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Port Sanilac’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 10° to 34°. June is the most reliable, staying within 9°.
Common questions about Port Sanilac’s climate
What is the coldest month in Port Sanilac?
January, with a typical high of 30° and a low of 18°.
What is the hottest month in Port Sanilac?
July, with a typical high of 79° and a low of 62°. About 6 days a year reach 90°.
When is the first frost in Port Sanilac?
In half of years the first 32° night comes by October 24, and the last spring frost by May 4.
What is the rainiest month in Port Sanilac?
May, with 3.4 inches of rain and melted snow. The year totals 33 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Port Sanilac itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lexington Wtp, MI (11 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.