Jamestown, ND climate
Jamestown has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 82°, a January night drops to 1°, and about 46 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Jamestown feels like
Winter
Spring
Summer
Fall
Jamestown 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 19° | 1° | 0.4" | 11.4" | 6 | -4° – 26° |
| February | 24° | 5° | 0.5" | 7.4" | 6 | -1° – 26° |
| March | 37° | 17° | 0.8" | 6.5" | 5 | 15° – 41° |
| April | 54° | 30° | 1.3" | 2.5" | 8 | 32° – 50° |
| May | 67° | 43° | 3.2" | 0.4" | 12 | 50° – 61° |
| June | 76° | 54° | 3.5" | 0 | 13 | 59° – 70° |
| July | 82° | 58° | 3.5" | 0 | 11 | 63° – 75° |
| August | 80° | 55° | 2.4" | 0 | 8 | 62° – 72° |
| September | 71° | 46° | 2.1" | 0 | 8 | 53° – 64° |
| October | 55° | 33° | 1.8" | 1.9" | 7 | 35° – 49° |
| November | 38° | 19° | 0.6" | 4.2" | 6 | 16° – 40° |
| December | 24° | 7° | 0.5" | 11.8" | 6 | 2° – 25° |
| Year | 52° | 31° | 20.5" | 46.1" | 95 |
“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 Jamestown
Jamestown gets 20 inches of rain and melted snow a year. July is the wettest month and January the driest. Rain or snow falls on about 95 days a year.
About 143 frost-free days a year
In half of years the last 32° night comes by May 8 and the first one by September 29. That leaves about 143 frost-free days for gardens, shorter than 87% of U.S. towns.
Heating and cooling a home in Jamestown
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Jamestown, 95% of that work is heating and 5% 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.
Jamestown and its neighbors
Jamestown borders 4 towns with climate data. January nights across them vary by 0.6°. Bloom has the coldest January nights (1°) and Homer the hottest July afternoons (82°). Jamestown’s January low is 1° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Jamestown 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 Jamestown averaged 1.2° warmer than the 1900s. The biggest change is in January (+3.4°). The shift is larger than in 52% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Jamestown’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from -4° to 26°. June is the most reliable, staying within 10°.
Common questions about Jamestown’s climate
What is the coldest month in Jamestown?
January, with a typical high of 19° and a low of 1°.
What is the hottest month in Jamestown?
July, with a typical high of 82° and a low of 58°. About 11 days a year reach 90°.
How much snow does Jamestown get?
About 46 inches in a normal winter, most of it in December.
When is the first frost in Jamestown?
In half of years the first 32° night comes by September 29, and the last spring frost by May 8.
What is the rainiest month in Jamestown?
July, with 3.5 inches of rain and melted snow. The year totals 20 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Jamestown itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Jamestown State Hosp, ND (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.