Boulder, Montana Climate
United States
Pop. 1,207 Elev. 1,496 m / 4,908 ft
TZ: America/Denver (UTC-6) ·
Boulder has harsh winters with February lows averaging 8°F (-13°C), and mild summers with July highs of 79°F (26°C). Wind chill can push winter lows to 1°F (-17°C). Rain falls on about 20 days per year (14.9 in / 379 mm total), with snow on 13 days and 86 in (2177 mm) of annual accumulation. The city averages 127 sunny days per year. Nearby lake water reaches 69°F (21°C) in summer.
| Temperature | 79°F (26°C) high | 8°F (-13°C) low |
| Feels like | 1°F (-17°C) low | |
| Rain | 20 days | 14.9 in (379 mm) /yr |
| Snow | 13 days | 85.7 in (2177 mm) /yr |
| Sky | 127 sunny | 11 stormy |
| Wind | 2.8 mph (1.2 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Sep
Sky & Air by Month
Cloud cover (%)
56
Jan 70
Feb 69
Mar 52
Apr 51
May 46
Jun 47
Jul 45
Aug 37
Sep 46
Oct 64
Nov 68
Dec Humidity (%)
79
Jan 75
Feb 69
Mar 61
Apr 60
May 53
Jun 53
Jul 54
Aug 49
Sep 63
Oct 69
Nov 78
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 26 mi Helena Regional Airport (HLN)
Ski resort 26 mi Homestake Lodge & Ski Area
National park 89 mi
Mountain peak
(5,086 ft) 0 mi Capital Hill
Hospital 25 mi Saint Peter's Health
Hiking trail 37 mi CDT - Idaho & Montana Section
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 23°F -5°C | 8°F -13°C | 0.0 in 0 mm | 10.9 in277 mm | 9 |
| February | 24°F -5°C | 8°F -13°C | 0.1 in 3 mm | 20.4 in519 mm | 4 |
| March | 43°F 6°C | 25°F -4°C | 0.4 in 9 mm | 10.5 in266 mm | 4 |
| April | 50°F 10°C | 27°F -3°C | 1.0 in 25 mm | 8.2 in209 mm | 11 |
| May | 63°F 17°C | 38°F 4°C | 3.1 in 80 mm | 8.3 in210 mm | 13 |
| June | 71°F 22°C | 44°F 7°C | 2.4 in 62 mm | 0.5 in13 mm | 15 |
| July | 79°F 26°C | 50°F 10°C | 2.6 in 66 mm | — | 14 |
| August | 78°F 25°C | 50°F 10°C | 1.8 in 46 mm | — | 16 |
| September | 74°F 23°C | 46°F 8°C | 0.9 in 22 mm | — | 16 |
| October | 52°F 11°C | 32°F 0°C | 1.2 in 31 mm | 6.8 in173 mm | 16 |
| November | 44°F 7°C | 28°F -2°C | 0.7 in 18 mm | 5.3 in134 mm | 4 |
| December | 36°F 2°C | 20°F -7°C | 0.7 in 18 mm | 14.8 in376 mm | 5 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 9 | 0 |
| February | 4 | 0 |
| March | 4 | 0 |
| April | 11 | 0 |
| May | 13 | 1 |
| June | 15 | 3 |
| July | 14 | 3 |
| August | 16 | 2 |
| September | 16 | 0 |
| October | 16 | 1 |
| November | 4 | 0 |
| December | 5 | 1 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 35°F 2°C |
| February | 32°F 0°C |
| March | 32°F 0°C |
| April | 33°F 1°C |
| May | 39°F 4°C |
| June | 47°F 8°C |
| July | 62°F 16°C |
| August | 69°F 21°C |
| September | 66°F 19°C |
| October | 53°F 12°C |
| November | 45°F 7°C |
| December | 40°F 5°C |