South Lyon, MI Weather & Climate Normals
South Lyon's real weather, in one number
South Lyon, MI scores 49/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
South Lyon's hottest and coldest months
South Lyon's hottest month is Jul, averaging 70°F; its coldest is Jan, averaging 22°F, a 47.8°F swing across the year, one of the widest gaps in this dataset.
South Lyon's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 30°F | 15°F | 2.38in |
| Feb | 34°F | 14°F | 2.07in |
| Mar | 44°F | 24°F | 2.43in |
| Apr | 57°F | 34°F | 2.99in |
| May | 69°F | 45°F | 3.65in |
| Jun | 77°F | 54°F | 3.72in |
| Jul | 82°F | 59°F | 3.38in |
| Aug | 79°F | 58°F | 3.34in |
| Sep | 74°F | 50°F | 3.11in |
| Oct | 60°F | 40°F | 2.8in |
| Nov | 47°F | 30°F | 2.48in |
| Dec | 35°F | 22°F | 2.11in |
May, Jun, Jul, Aug, and Sep are the best time to see South Lyon at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in South Lyon
Over a typical year, South Lyon sees about 34.46in of precipitation a year across roughly 0 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where South Lyon ranks
South Lyon ranks 2173 of 4876 US cities in this dataset for comfort score, and 29 of 153 within MI. About 12,219 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Whitmore Lake 1nw, MI US, 6.9 miles from South Lyon, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is