Boston (4 mi SE), Virginia climate: Climate normals at a NOAA weather station
Boston (4 mi SE)'s normal year runs from 23°F January nights to 86°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.3°C, January lows of −5°C, July highs of 30°C.
- NOAA stationBoston (4 mi SE)
- Station IDUSC00440860
- Location38.55°N 78.10°W
- Elevation590 ft (180 m)
On October 23, the normal high in Boston (4 mi SE) is 65°F and the normal low 40°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Boston (4 mi SE).
- Jan 44° 23°
- Feb 48° 25°
- Mar 55° 31°
- Apr 67° 41°
- May 74° 50°
- Jun 82° 59°
- Jul 86° 64°
- Aug 84° 62°
- Sep 78° 55°
- Oct 67° 43°
- Nov 57° 33°
- Dec 48° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Boston (4 mi SE) each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 23°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 44°F | 23°F | 33.2°F | – | <1 | 26 | 9 h 50 min |
| February | 48°F | 25°F | 36.2°F | – | <1 | 24 | 10 h 40 min |
| March | 55°F | 31°F | 43.3°F | – | <1 | 19 | 11 h 50 min |
| April | 67°F | 41°F | 53.6°F | – | <1 | 5 | 13 h 10 min |
| May | 74°F | 50°F | 62.2°F | – | <1 | <1 | 14 h 10 min |
| June | 82°F | 59°F | 70.7°F | – | 5 | <1 | 14 h 50 min |
| July | 86°F | 64°F | 74.8°F | – | 9 | <1 | 14 h 40 min |
| August | 84°F | 62°F | 73.2°F | – | 7 | <1 | 13 h 40 min |
| September | 78°F | 55°F | 66.4°F | – | 2 | <1 | 12 h 30 min |
| October | 67°F | 43°F | 55.2°F | – | <1 | 5 | 11 h 20 min |
| November | 57°F | 33°F | 44.8°F | – | <1 | 17 | 10 h 10 min |
| December | 48°F | 26°F | 37.0°F | – | <1 | 25 | 9 h 30 min |
| Year (annual) | 66°F | 43°F | 54.2°F | – | 22 | 121 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 6°C | −5°C | 0.7°C |
| February | 9°C | −4°C | 2.3°C |
| March | 13°C | 0°C | 6.3°C |
| April | 19°C | 5°C | 12.0°C |
| May | 24°C | 10°C | 16.8°C |
| June | 28°C | 15°C | 21.5°C |
| July | 30°C | 18°C | 23.8°C |
| August | 29°C | 17°C | 22.9°C |
| September | 25°C | 13°C | 19.1°C |
| October | 20°C | 6°C | 12.9°C |
| November | 14°C | 0°C | 7.1°C |
| December | 9°C | −3°C | 2.8°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Sperryville (10 miles away), gets 21 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00440860; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Boston (4 mi SE)?
Normal highs sit between 65°F and 85°F in April, May, June, August, September and October.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00440860.
When is the last frost at Boston (4 mi SE)?
In Boston (4 mi SE), the last spring frost (32°F) comes after April 21 in half of years and after May 10 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 8 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 211 year in 10 after May 10; 9 in 10 after April 5
- First autumn frost, half of years before
- October 221 year in 10 before October 8; 9 in 10 before November 4
NOAA puts the median frost-free season at 184 days, and the season without a hard freeze (28°F) at 208 days.
A hard freeze (28°F) comes after April 5 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Boston (4 mi SE) in zone 7a in ZIP code 22713, the nearest ZIP area.
Frost dates for every NOAA station in Virginia · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00440860; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Boston (4 mi SE)?
In a normal year in Boston (4 mi SE), 22 days a year reach 90°F (1 of them 100°F or more) and 121 nights fall to 32°F or colder.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 121a normal year
- Days that stay below freezing
- 11high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00440860.
How sunny is it at Boston (4 mi SE)?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds at Boston (4 mi SE), 4.1 kWh per square metre a day. July is the sunniest month (78%) and January the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.2 |
| February | 70% | 3.0 |
| March | 70% | 4.0 |
| April | 72% | 5.0 |
| May | 71% | 5.5 |
| June | 77% | 6.2 |
| July | 78% | 6.0 |
| August | 78% | 5.3 |
| September | 75% | 4.4 |
| October | 74% | 3.4 |
| November | 75% | 2.5 |
| December | 70% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Boston (4 mi SE) record?
A normal year at Boston (4 mi SE) brings 4,837 heating degree days, 10% fewer than the median U.S. place (5,373), and 936 cooling degree days, 3% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,472 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 986 | 0 |
| February | 806 | 0 |
| March | 675 | 1 |
| April | 355 | 15 |
| May | 143 | 54 |
| June | 17 | 189 |
| July | 1 | 306 |
| August | 3 | 257 |
| September | 59 | 101 |
| October | 316 | 12 |
| November | 606 | 1 |
| December | 870 | 0 |
| Year (annual) | 4,837 | 936 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00440860. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Boston (4 mi SE)'s climate compare?
Boston (4 mi SE) is warmer than 24 of the 81 places with their own NOAA record in Virginia. Across the 7,247 U.S. stations with normals, its annual mean of 54.2°F is warmer than 58%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Boston (4 mi SE) share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Culpeper, VA21,464 people · 7 mi SE
- Brightwood, VA1,436 people · 10 mi SW
- Brandy Station, VA90 people · 12 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Boston (4 mi SE)'s climate
What is the coldest month at Boston (4 mi SE)?
January, with a normal high of 44°F and a normal low of 23°F. The warmest is July (86°F by day, 64°F at night).
Does it snow at Boston (4 mi SE)?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Sperryville (10 miles away), records 21 inches of snow in a normal year.
What plant hardiness zone is Boston (4 mi SE) in?
The USDA's 2023 map puts Boston (4 mi SE) in zone 7a in ZIP code 22713, the nearest ZIP area.
How late can frost come at Boston (4 mi SE)?
In half of years the last 32°F night comes after April 21; in one year in ten it comes after May 10. Waiting until May 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Virginia climateThe statewide normals and every place in the state
- Sperryville, VA11 miles from this station, 54.2°F a year
- Luray, VA17 miles from this station, 54.0°F a year
- Big Meadows, VA18 miles from this station, 47.5°F a year
- Warrenton, VA20 miles from this station, 54.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made