When to paint a house exterior in Longmont, CO
When to paint in Longmont, CO
Exterior painting here is a gamble in any month. The painting window is not reliable in any month, with 0 good months a year. The best month is June, at about 5 painting days.
If you cannot avoid the thin months, ask the painter for a low-temperature latex and watch the forecast for a dry run of 4 days before you commit. No month here reliably has the dry back-to-back days deck stain needs, so consider a solid stain or a sealer you can apply in shorter breaks.
- under 1Jan
- under 1Feb
- under 1Mar
- 1Apr
- 3May
- 5Jun
- 2Jul
- 4Aug
- 5Sep
- 1Oct
- 1Nov
- under 1Dec
Month by month
| Month | Painting days | Staining days | With low-temp paint | Avg low / high |
|---|---|---|---|---|
| January | under 1 | under 1 | 1 | 20° / 51°F |
| February | under 1 | under 1 | 3 | 21° / 53°F |
| March | under 1 | under 1 | 3 | 27° / 61°F |
| April | 1 | 1 | 13 | 35° / 71°F |
| May | 3 | 1 | 22 | 44° / 78°F |
| June | 5 | 4 | 10 | 54° / 90°F |
| July | 2 | under 1 | 2 | 59° / 95°F |
| August | 4 | 2 | 5 | 57° / 93°F |
| September | 5 | 4 | 15 | 49° / 88°F |
| October | 1 | 1 | 17 | 37° / 74°F |
| November | 1 | 1 | 3 | 26° / 60°F |
| December | under 1 | under 1 | 1 | 20° / 53°F |
Deck stain does best in June. Low-temperature paint adds about 71 days a year here.
Towns near Longmont compared
6 of the 6 nearest places get more painting days, the most in Frederick (36 a year, 8 miles southeast). 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.
| Place | From Longmont | Painting days a year | Window | Station |
|---|---|---|---|---|
| Frederick, CO | 8 mi southeast | 36 | June to August | Erie Municipal Airport |
| Firestone, CO | 8 mi east | 36 | June to August | Erie Municipal Airport |
| Erie, CO | 9 mi south | 36 | June to August | Erie Municipal Airport |
| Berthoud, CO | 11 mi northeast | 30 | August to September | Fort Collins Loveland Airport |
| Lafayette, CO | 12 mi south | 36 | June to August | Erie Municipal Airport |
| Boulder, CO | 13 mi southwest | 36 | June to August | Erie Municipal Airport |
How Longmont ranks in CO
Of 53 CO places with 10,000 people or more, Longmont (population 99,818, 13th largest) ranks 47th for painting days, 14 days below the state median of 36. The longest season in the state is Cañon City, 71 days, 119 miles south. The shortest is Glenwood Springs at 12. Switching to low-temperature paint here is worth 71 extra days, more than most of the summer months on their own.
Where these numbers come from
Daily records from Vance Brand Airport (3.5 miles away), 2015 to 2024, NOAA Global Summary of the Day. A month is good at 12+ painting days and possible at 6+.