When to paint a house exterior in Alton, IL
When to paint in Alton, IL
A normal season: plan the job, do not leave it late. The painting window is May to September, with 5 good months a year. The best month is August, at about 19 painting days. Book a painter by March.
If you want the house done in May to September, call for quotes in March or earlier; a job pushed past September is likely to wait until next year. For a deck, the months with enough staining days to spare are Apr, May, Jun, Jul, Aug, Sep, Oct.
- under 1Jan
- under 1Feb
- 1Mar
- 5Apr
- 15May
- 17Jun
- 18Jul
- 19Aug
- 18Sep
- 8Oct
- 1Nov
- under 1Dec
Month by month
| Month | Painting days | Staining days | With low-temp paint | Avg low / high |
|---|---|---|---|---|
| January | under 1 | under 1 | 2 | 24° / 40°F |
| February | under 1 | under 1 | 4 | 27° / 47°F |
| March | 1 | 1 | 8 | 36° / 57°F |
| April | 5 | 4 | 17 | 43° / 67°F |
| May | 15 | 15 | 22 | 56° / 77°F |
| June | 17 | 16 | 17 | 64° / 86°F |
| July | 18 | 17 | 18 | 67° / 87°F |
| August | 19 | 19 | 20 | 65° / 84°F |
| September | 18 | 17 | 22 | 59° / 82°F |
| October | 8 | 8 | 22 | 46° / 69°F |
| November | 1 | 1 | 8 | 35° / 55°F |
| December | under 1 | under 1 | 2 | 30° / 46°F |
Deck stain does best in August. Low-temperature paint adds about 58 days a year here.
Towns near Alton compared
3 get fewer, down to 70 a year. A gap like that between towns is usually elevation, a coast or a lake, which is why a painter from a few towns over can be on a different schedule. Wood River, Godfrey, Edwardsville are read from the same station as Alton, so their numbers match; the real difference is the distance from that station.
| Place | From Alton | Painting days a year | Window | Station |
|---|---|---|---|---|
| Wood River, IL | 5 mi southeast | 103 | May to September | same station |
| Godfrey, IL | 5 mi northwest | 103 | May to September | same station |
| Bellefontaine Neighbors, MO | 11 mi south | 70 | September | Lambert-St Louis Internationa |
| Edwardsville, IL | 12 mi southeast | 103 | May to September | same station |
| Florissant, MO | 12 mi southwest | 70 | September | Lambert-St Louis Internationa |
| Granite City, IL | 12 mi south | 75 | August to September | St Louis Downtown Airport |
How Alton ranks in IL
Of 225 IL places with 10,000 people or more, Alton (population 24,967, 89th largest) ranks 6th for painting days, 26 days above the state median of 77. The longest season in the state is Chicago, 131 days, 241 miles northeast. The shortest is Woodstock at 65. Switching to low-temperature paint here is worth 58 extra days, more than most of the summer months on their own.
Where these numbers come from
Daily records from St Louis Regional Airport (5.6 miles away), 2015 to 2024, NOAA Global Summary of the Day. A month is good at 12+ painting days and possible at 6+.