Sat Sun Sat Sun
4-1 4-2 4-8 4-9
75° 56° 69° 78° 79° 73° 58° 55° 57° 56° 57° 58° 63° 66°
50° 40° 42° 52° 61° 59° 48° 42° 46° 47° 46° 44° 46° 49°
Predictability
55% 80% 75% 75% 40% 30% 65% 30% 20% 5% 25% 25% 35% 35%
Temperature ( °F)
Precipitation (in) / Precipitation probability (%)
Sat Sun Sat Sun
85% 10% 0% 10% 55% 65% 25% 45% 45% 60% 60% 30% 20% 15%

This chart shows the 14 day weather trend for Ashburn (Virginia, United States) with daily weather symbols, minimum and maximum temperatures, precipitation amount and probability.

  • The deviance is coloured within the temperature graph. The stronger the ups and downs, the more uncertain the forecast will be. The thick line represents the most probable trend.
  • Variation in precipitation is represented as a „T“. These uncertainties usually increase with the number of forecasts days ahead.
  • The forecast is created with „ensemble“ models. Several model runs with varying start parameter are calculated to estimate the predictability of the forecast more precisely.

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