When to paint a house exterior in Ontario, CA
When to paint in Ontario, CA
A normal season: plan the job, do not leave it late. The painting window is April to June, with 4 good months a year. The best month is May, at about 23 painting days. Book a painter by February.
If you want the house done in April to June, call for quotes in February or earlier; a job pushed past June is likely to wait until next year. For a deck, the months with enough staining days to spare are Apr, May, Jun, Sep, Oct, Nov.
- 3Jan
- 4Feb
- 8Mar
- 18Apr
- 23May
- 14Jun
- 3Jul
- 4Aug
- 11Sep
- 17Oct
- 8Nov
- 1Dec
Month by month
| Month | Painting days | Staining days | With low-temp paint | Avg low / high |
|---|---|---|---|---|
| January | 3 | 2 | 24 | 43° / 69°F |
| February | 4 | 4 | 21 | 44° / 71°F |
| March | 8 | 4 | 22 | 47° / 73°F |
| April | 18 | 16 | 24 | 52° / 80°F |
| May | 23 | 23 | 24 | 55° / 80°F |
| June | 14 | 14 | 14 | 61° / 90°F |
| July | 3 | 2 | 3 | 66° / 97°F |
| August | 4 | 3 | 4 | 66° / 97°F |
| September | 11 | 11 | 11 | 64° / 93°F |
| October | 17 | 16 | 18 | 58° / 87°F |
| November | 8 | 7 | 25 | 48° / 78°F |
| December | 1 | 1 | 24 | 43° / 70°F |
Deck stain does best in May. Low-temperature paint adds about 100 days a year here.
Towns near Ontario compared
2 of the 6 nearest places get more painting days, the most in Montclair (220 a year, 6 miles northwest); 3 get fewer, down to 76 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. Rancho Cucamonga is read from the same station as Ontario, so its numbers match; the real difference is the distance from that station.
| Place | From Ontario | Painting days a year | Window | Station |
|---|---|---|---|---|
| Eastvale, CA | 5 mi south | 76 | May to June | Chino Airport |
| Chino, CA | 6 mi southwest | 76 | May to June | Chino Airport |
| Montclair, CA | 6 mi northwest | 220 | March to January | Cable |
| Upland, CA | 6 mi northwest | 220 | March to January | Cable |
| Rancho Cucamonga, CA | 7 mi north | 114 | April to June | same station |
| Jurupa Valley, CA | 8 mi east | 103 | April to June | Riverside Municipal Airport |
How Ontario ranks in CA
Of 376 CA places with 10,000 people or more, Ontario (population 185,285, 25th largest) ranks 209th for painting days, 13 days below the state median of 128. The longest season in the state is Santa Clarita, 269 days, 57 miles northwest. The shortest is Susanville at 4. Switching to low-temperature paint here is worth 100 extra days, more than most of the summer months on their own.
Where these numbers come from
Daily records from Ontario International Airport (1.4 miles away), 2015 to 2024, NOAA Global Summary of the Day. A month is good at 12+ painting days and possible at 6+.