FROST Station : DUNCAN, OK2660 Start yr. - 1961 End yr. - 1990 Requested years of data: 30 Available years of data: 30 Spring: Years of missing data 24 deg = 8, 28 deg = 8, 32 deg = 6 Years with no occurrence 24 deg = 0, 28 deg = 0, 32 deg = 0 Data years used 24 deg = 22, 28 deg = 22, 32 deg = 24 Fall: Years of missing data 24 deg = 4, 28 deg = 4, 32 deg = 4 Years with no occurrence 24 deg = 0, 28 deg = 0, 32 deg = 0 Data years used 24 deg = 26, 28 deg = 26, 32 deg = 26 ------------------------------------------------------------------------ | Temperature ---------------------------|-------------------------------------------- Probability | 24F or lower | 28F or lower | 32F or lower | ---------------------------|--------------|--------------|-------------- | | | Last freezing temperature | | | in spring: | | | | | | 1 year in 10 later than-- | March 19 | March 31 | April 11 | | | 2 year in 10 later than-- | March 14 | March 25 | April 5 | | | 5 year in 10 later than-- | March 3 | March 15 | March 25 | | | First freezing temperature | | | in fall: | | | | | | 1 yr in 10 earlier than-- | November 16 | November 5 | October 26 | | | 2 yr in 10 earlier than-- | November 22 | November 11 | October 31 | | | 5 yr in 10 earlier than-- | December 3 | November 22 | November 8 | | | ------------------------------------------------------------------------