Rockport Colony, MT climate
Rockport Colony has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 78°, a January night drops to 13°, and about 48 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Rockport Colony feels like
Winter
Spring
Summer
Fall
Rockport Colony weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 13° | 0.5" | 6.4" | 5 | 13 | 11° – 33° |
| February | 36° | 13° | 0.6" | 7.6" | 6 | 10 | 3° – 35° |
| March | 43° | 20° | 0.8" | 8.1" | 6 | 7 | 16° – 40° |
| April | 51° | 28° | 1.2" | 6.6" | 8 | 3 | 33° – 45° |
| May | 61° | 36° | 2.6" | 1.4" | 9 | 0 | 43° – 53° |
| June | 68° | 43° | 3.1" | 0 | 11 | 0 | 53° – 62° |
| July | 78° | 48° | 1.3" | 0 | 6 | 0 | 54° – 70° |
| August | 78° | 47° | 1.2" | 0 | 7 | 0 | 56° – 66° |
| September | 68° | 39° | 1.4" | 0.9" | 6 | 0 | 50° – 59° |
| October | 54° | 30° | 1.0" | 4.2" | 6 | 3 | 35° – 49° |
| November | 41° | 21° | 0.7" | 6.9" | 5 | 8 | 20° – 40° |
| December | 35° | 14° | 0.5" | 5.4" | 5 | 11 | 13° – 32° |
| Year | 54° | 29° | 14.8" | 47.5" | 79 | 54 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Rockport Colony
Rockport Colony gets 15 inches of rain and melted snow a year. June is the wettest month and December the driest. Rain or snow falls on about 79 days a year. Snow covers the ground about 54 days of the year.
About 86 frost-free days a year
In half of years the last 32° night comes by June 9 and the first one by September 3. That leaves about 86 frost-free days for gardens, shorter than 99% of U.S. towns.
Heating and cooling a home in Rockport Colony
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Rockport Colony, 99% of that work is heating and 1% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Rockport Colony compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Rockport Colony averaged 2.0° warmer than the 1900s. The biggest change is in January (+5.6°). The shift is larger than in 93% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Rockport Colony’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 3° to 35°. June is the most reliable, staying within 10°.
Common questions about Rockport Colony’s climate
What is the coldest month in Rockport Colony?
January, with a typical high of 35° and a low of 13°.
What is the hottest month in Rockport Colony?
July, with a typical high of 78° and a low of 48°. About 10 days a year reach 90°.
How much snow does Rockport Colony get?
About 48 inches in a normal winter, most of it in March.
When is the first frost in Rockport Colony?
In half of years the first 32° night comes by September 3, and the last spring frost by June 9.
What is the rainiest month in Rockport Colony?
June, with 3.1 inches of rain and melted snow. The year totals 15 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Rockport Colony itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Choteau, MT (21 mi, snow) and Blackleaf, MT (4 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.