St. Ignace, MI climate
St. Ignace has cold, snowy winters and cool summers. A typical July afternoon reaches 75°, a January night drops to 12°, and about 81 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in St. Ignace feels like
Winter
Spring
Summer
Fall
St. Ignace weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 25° | 12° | 1.8" | 20.4" | 17 | 30 | 6° – 27° |
| February | 27° | 11° | 1.2" | 14.8" | 14 | 29 | 4° – 30° |
| March | 36° | 19° | 1.7" | 9.8" | 11 | 27 | 17° – 40° |
| April | 48° | 30° | 2.6" | 6.8" | 12 | 10 | 31° – 45° |
| May | 61° | 40° | 2.8" | 0 | 11 | 0 | 45° – 57° |
| June | 70° | 51° | 3.1" | 0 | 11 | 0 | 57° – 66° |
| July | 75° | 57° | 3.1" | 0 | 11 | 0 | 59° – 70° |
| August | 74° | 57° | 3.1" | 0 | 10 | 0 | 61° – 69° |
| September | 68° | 50° | 3.6" | 0 | 12 | 0 | 54° – 64° |
| October | 54° | 40° | 4.2" | 0.4" | 15 | 0 | 42° – 53° |
| November | 42° | 30° | 2.7" | 7.4" | 14 | 7 | 29° – 42° |
| December | 32° | 21° | 2.2" | 21.3" | 16 | 25 | 16° – 35° |
| Year | 51° | 35° | 32.0" | 80.9" | 155 | 127 |
“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 St. Ignace
St. Ignace gets 32 inches of rain and melted snow a year. October is the wettest month and February the driest. Rain or snow falls on about 155 days a year. Snow covers the ground about 127 days of the year.
About 149 frost-free days a year
In half of years the last 32° night comes by May 16 and the first one by October 13. That leaves about 149 frost-free days for gardens, shorter than 82% of U.S. towns.
Heating and cooling a home in St. Ignace
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In St. Ignace, 98% of that work is heating and 2% 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.
St. Ignace and its neighbors
St. Ignace borders 2 towns with climate data. January nights across them vary by 2.6°. Moran has both the coldest January nights (10°) and the hottest July afternoons (76°). St. Ignace’s January low is 12° and its July high 75°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How St. Ignace 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 St. Ignace averaged 1.9° warmer than the 1900s. The biggest change is in February (+3.3°). The shift is larger than in 90% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at St. Ignace’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 4° to 30°. August is the most reliable, staying within 8°.
Common questions about St. Ignace’s climate
What is the coldest month in St. Ignace?
February, with a typical high of 27° and a low of 11°.
What is the hottest month in St. Ignace?
July, with a typical high of 75° and a low of 57°.
How much snow does St. Ignace get?
About 81 inches in a normal winter, most of it in December.
When is the first frost in St. Ignace?
In half of years the first 32° night comes by October 13, and the last spring frost by May 16.
What is the rainiest month in St. Ignace?
October, with 4.2 inches of rain and melted snow. The year totals 32 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for St. Ignace itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Moran, MI (9 mi, snow) and St Ignace, MI (2 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.