The year at a glance
Averages from 30 years of climate history, 1991-2020
| Herndon | Metric | Reston |
|---|---|---|
| 205 days | Sunny daysclear or partly cloudy skies | 205 days |
| 42 in | Precipitationper year | 43 in |
| 119 days | Wet daysrain or snow per year | 119 days |
| 21 in | Snowfallper year | 19 in |
| 29 days | Hot daysabove 90 °F | 23 days |
| 106 days | Freezing nightsat or below 32 °F | 103 days |
| 69% | Humidityaverage relative | 68% |
| 55 °F | Average temperatureyear round | 55 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Herndon high | 42 | 46 | 54 | 66 | 74 | 82 | 87 | 86 | 79 | 67 | 56 | 46 |
| Reston high | 42 | 46 | 54 | 66 | 73 | 82 | 86 | 85 | 78 | 67 | 56 | 46 |
| Herndon low | 25 | 26 | 33 | 43 | 53 | 62 | 67 | 65 | 58 | 45 | 35 | 29 |
| Reston low | 24 | 26 | 33 | 42 | 53 | 62 | 67 | 65 | 58 | 45 | 35 | 29 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Herndon | 3.0 | 2.8 | 3.8 | 3.4 | 3.8 | 3.4 | 3.9 | 3.3 | 4.3 | 3.4 | 3.0 | 3.5 |
| Reston | 3.1 | 2.9 | 3.9 | 3.4 | 3.9 | 3.6 | 4.1 | 3.6 | 4.5 | 3.5 | 3.0 | 3.5 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Herndon | 16 | 15 | 16 | 16 | 16 | 17 | 19 | 19 | 18 | 20 | 18 | 16 |
| Reston | 16 | 15 | 16 | 16 | 16 | 17 | 19 | 19 | 18 | 20 | 18 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Herndon vs another city
- Herndon vs Hutchison, VA
- Herndon vs McNair, VA
- Herndon vs Dranesville, VA
- Herndon vs Sterling, VA
- Herndon vs Floris, VA
- Herndon vs New York, NY
- Herndon vs Los Angeles, CA
- Herndon vs Chicago, IL
- Herndon vs Houston, TX
- Herndon vs Phoenix, AZ
- Herndon vs Philadelphia, PA
Reston vs another city
- Reston vs Difficult Run, VA
- Reston vs Dranesville, VA
- Reston vs Wolf Trap, VA
- Reston vs Hutchison, VA
- Reston vs McNair, VA
- Reston vs New York, NY
- Reston vs Los Angeles, CA
- Reston vs Chicago, IL
- Reston vs Houston, TX
- Reston vs Phoenix, AZ
- Reston vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).