5-day weather forecast for Hartwood, Virginia

Weather changeability for Herndon, Virginia

Temperature Last Month Last Year
Average change in high temperature day-to-day 8.7° 6.2°
Average change in low temperature day-to-day 13.8° 8.0°
Precipitation Last Month Last Year
Chance of dry day after a precip day 86% 61%
Chance of precip day after a dry day 26% 28%

Weather forecast accuracy for Herndon, Virginia

Last Month
Foreca   76.08%
AccuWeather   74.73%
MeteoGroup   73.66%
Weather Underground   73.56%
The Weather Channel   73.12%
Dark Sky (forecast.io)   68.01%
NWS Digital Forecast   67.78%
World Weather Online   57.26%
Persistence   33.61%
Last Year
Weather Underground   77.10%
The Weather Channel   77.03%
MeteoGroup   76.58%
AccuWeather   76.09%
Foreca   75.14%
Dark Sky (forecast.io)   70.21%
NWS Digital Forecast   69.11%
World Weather Online   59.05%
Persistence   42.91%

ForecastAdvisor Fact

74.2% of AccuWeather's high temperature forecasts for Herndon were within 3 degrees of actual temperatures last year.