As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Low Temp: 29 °F. The clearer part of the year in Alexandria begins around July 3 and lasts for 4.3 months, ending around November 13. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. Wind: 8 mph. precipitation in Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ... © US Climate Data 2020 | version 3.0 | by Your Weather Service |, Average precipitation in : Av. Station Data. The calmer time of year lasts for 5.4 months, from May 7 to October 20. The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day). Click on each chart for more information. The black line is the percentage chance that a given day is within the growing season.