Bull Run, VA climate
Bull Run has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 26°, and about 21 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade7° warmer than normal today. The forecast high is 81°, and a typical Sep 30 in Bull Run peaks around 74°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Bull Run feels like
Winter
Spring
Summer
Fall
Bull Run 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 | 43° | 26° | 2.9" | 6.9" | 10 | 4 | 26° – 42° |
| February | 47° | 27° | 2.5" | 7.0" | 9 | 5 | 26° – 45° |
| March | 55° | 34° | 3.4" | 3.9" | 11 | 2 | 38° – 54° |
| April | 67° | 44° | 3.3" | 0.1" | 11 | 0 | 51° – 61° |
| May | 75° | 53° | 4.2" | 0 | 13 | 0 | 60° – 70° |
| June | 83° | 62° | 4.1" | 0 | 11 | 0 | 69° – 77° |
| July | 88° | 67° | 4.2" | 0 | 11 | 0 | 73° – 81° |
| August | 86° | 65° | 3.5" | 0 | 9 | 0 | 70° – 79° |
| September | 79° | 58° | 4.0" | 0 | 9 | 0 | 66° – 73° |
| October | 68° | 46° | 3.7" | 0 | 8 | 0 | 53° – 63° |
| November | 57° | 36° | 3.0" | 0.3" | 9 | 0 | 40° – 52° |
| December | 47° | 29° | 3.4" | 2.8" | 10 | 2 | 29° – 49° |
| Year | 66° | 46° | 42.0" | 21.0" | 121 | 14 |
“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 Bull Run
Bull Run gets 42 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 121 days a year. Snow covers the ground about 14 days of the year.
About 194 frost-free days a year
In half of years the last 32° night comes by April 15 and the first one by October 24. That leaves about 194 frost-free days for gardens, longer than 68% of U.S. towns.
Heating and cooling a home in Bull Run
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Bull Run, 79% of that work is heating and 21% is cooling.
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.
Bull Run and its neighbors
Bull Run borders 5 towns with climate data. January nights across them vary by 0.4°. Centreville has the coldest January nights (26°) and Sudley the hottest July afternoons (88°). Bull Run’s January low is 26° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Bull Run 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 Bull Run averaged 1.7° warmer than the 1900s. The biggest change is in December (+2.9°). The shift is larger than in 83% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Bull Run’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 29° to 49°. September is the most reliable, staying within 7°.
Common questions about Bull Run’s climate
What is the coldest month in Bull Run?
January, with a typical high of 43° and a low of 26°.
What is the hottest month in Bull Run?
July, with a typical high of 88° and a low of 67°. About 33 days a year reach 90°.
How much snow does Bull Run get?
About 21 inches in a normal winter, most of it in February.
When is the first frost in Bull Run?
In half of years the first 32° night comes by October 24, and the last spring frost by April 15.
What is the rainiest month in Bull Run?
July, with 4.2 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Bull Run itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Washington Dc Dulles Airport, VA (7 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.