FROST Station : MANASSAS 3 NW, VA5213 Start yr. - 1961 End yr. - 1985 Requested years of data: 25 Available years of data: 24 Spring: Years of missing data 24 deg = 7, 28 deg = 6, 32 deg = 5 Years with no occurrence 24 deg = 0, 28 deg = 0, 32 deg = 0 Data years used 24 deg = 18, 28 deg = 19, 32 deg = 20 Fall: Years of missing data 24 deg = 10, 28 deg = 9, 32 deg = 9 Years with no occurrence 24 deg = 0, 28 deg = 0, 32 deg = 0 Data years used 24 deg = 15, 28 deg = 16, 32 deg = 16 ------------------------------------------------------------------------ | Temperature ---------------------------|-------------------------------------------- Probability | 24F or lower | 28F or lower | 32F or lower | ---------------------------|--------------|--------------|-------------- | | | Last freezing temperature | | | in spring: | | | | | | 1 year in 10 later than-- | April 8 | April 20 | May 5 | | | 2 year in 10 later than-- | April 2 | April 15 | April 30 | | | 5 year in 10 later than-- | March 22 | April 5 | April 20 | | | First freezing temperature | | | in fall: | | | | | | 1 yr in 10 earlier than-- | October 19 | October 13 |September 30 | | | 2 yr in 10 earlier than-- | October 25 | October 18 | October 6 | | | 5 yr in 10 earlier than-- | November 5 | October 28 | October 16 | | | ------------------------------------------------------------------------