Markham, IL Weather & Climate Normals
Markham's real weather, in one number
Markham, IL scores 45/100 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.
Markham's hottest and coldest months
Markham's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 23°F, a 50.7°F swing across the year, one of the widest gaps in this dataset.
Markham's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 31°F | 15°F | 2.49in | 10.2in |
| Feb | 35°F | 18°F | 2.15in | 7.5in |
| Mar | 46°F | 28°F | 2.65in | 4.9in |
| Apr | 59°F | 38°F | 4.02in | 0.5in |
| May | 71°F | 49°F | 4.57in | 0in |
| Jun | 80°F | 59°F | 4.91in | 0in |
| Jul | 84°F | 64°F | 4.73in | 0in |
| Aug | 82°F | 62°F | 4.02in | 0in |
| Sep | 76°F | 55°F | 3.44in | 0in |
| Oct | 63°F | 42°F | 3.65in | 0.2in |
| Nov | 48°F | 31°F | 3in | 0.9in |
| Dec | 36°F | 22°F | 2.47in | 4in |
May, Jun, Jul, Aug, and Sep are the best time to see Markham at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Markham
Markham averages 42.1in of precipitation a year across roughly 124 days with measurable rain or snow, and 28.2in of snow a year.
Where Markham ranks
Markham ranks 3444 of 4876 US cities in this dataset for comfort score, and 142 of 330 within IL. About 11,290 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Park Forest, IL US, 7.3 miles from Markham, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station