SEATTLE URBAN SITE, WASHINGTON

Monthly Extreme Minimum Temperature (Degrees Fahrenheit)

(457458)

File last updated on Jul 25, 2006
*** Note *** Provisional Data *** After Year/Month 199804
a = 1 day missing, b = 2 days missing, c = 3 days, ..etc..,
z = 26 or more days missing, A = Accumulations present
Long-term means based on columns; thus, the monthly row may not
sum (or average) to the long-term annual value.
MAXIMUM ALLOWABLE NUMBER OF MISSING DAYS : 5
Individual Months not used for annual or monthly statistics if more than 5 days are missing.
Individual Years not used for annual statistics if any month in that year has more than 5 days missing.
YEAR(S) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC ANN
1972 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 15.00 15.00
1973 16.00 30.00 36.00 35.00 42.00 46.00 49.00 48.00 46.00 42.00 31.00 30.00 16.00
1974 20.00 32.00 29.00 35.00 41.00 45.00 50.00 53.00 45.00 41.00 35.00 32.00 20.00
1975 29.00 29.00 30.00 33.00 39.00 47.00 52.00 a 50.00 48.00 38.00 24.00 29.00 24.00
1976 29.00 25.00 28.00 33.00 43.00 42.00 50.00 53.00 50.00 39.00 29.00 32.00 25.00
1977 25.00 34.00 34.00 37.00 39.00 47.00 50.00 52.00 46.00 41.00 20.00 28.00 20.00
1978 25.00 30.00 31.00 35.00 39.00 49.00 52.00 53.00 46.00 36.00 26.00 14.00 14.00
1979 17.00 25.00 33.00 36.00 43.00 48.00 47.00 53.00 50.00 41.00 31.00 31.00 17.00
1980 16.00 30.00 32.00 36.00 42.00 47.00 52.00 48.00 47.00 38.00 35.00 24.00 16.00
1981 33.00 26.00 33.00 34.00 42.00 46.00 50.00 54.00 45.00 39.00 30.00 31.00 26.00
1982 18.00 26.00 32.00 34.00 40.00 46.00 52.00 49.00 45.00 37.00 28.00 27.00 18.00
1983 28.00 31.00 37.00 37.00 44.00 50.00 51.00 54.00 42.00 42.00 30.00 12.00 12.00
1984 23.00 35.00 35.00 37.00 42.00 47.00 52.00 51.00 44.00 34.00 32.00 23.00 23.00
1985 27.00 21.00 31.00 33.00 38.00 47.00 52.00 49.00 41.00 34.00 13.00 20.00 13.00
1986 31.00 23.00 36.00 36.00 42.00 50.00 51.00 54.00 46.00 42.00 32.00 31.00 23.00
1987 28.00 31.00 35.00 38.00 45.00 47.00 51.00 49.00 45.00 40.00 32.00 26.00 26.00
1988 25.00 25.00 32.00 36.00 40.00 47.00 49.00 ----- z 45.00 38.00 35.00 28.00 25.00
1989 30.00 11.00 23.00 38.00 43.00 49.00 51.00 53.00 47.00 38.00 34.00 31.00 11.00
1990 31.00 23.00 33.00 39.00 41.00 48.00 52.00 54.00 48.00 40.00 34.00 ----- z 23.00
1991 24.00 34.00 31.00 33.00 44.00 42.00 51.00 50.00 46.00 31.00 32.00 29.00 24.00
1992 27.00 32.00 36.00 35.00 42.00 49.00 51.00 51.00 42.00 36.00 30.00 28.00 27.00
1993 21.00 22.00 34.00 38.00 46.00 50.00 53.00 50.00 43.00 42.00 22.00 29.00 21.00
1994 30.00 23.00 32.00 38.00 42.00 47.00 51.00 54.00 49.00 42.00 29.00 23.00 23.00
1995 25.00 a 25.00 a 28.00 36.00 43.00 47.00 53.00 51.00 50.00 34.00 32.00 27.00 25.00
1996 17.00 21.00 30.00 35.00 38.00 48.00 49.00 52.00 44.00 35.00 26.00 25.00 17.00
1997 24.00 28.00 33.00 32.00 39.00 49.00 53.00 56.00 48.00 41.00 33.00 32.00 24.00
1998 24.00 34.00 31.00 37.00 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 24.00
Period of Record Statistics
MEAN 24.73 27.15 32.12 35.62 41.56 47.20 50.96 51.71 45.92 38.44 29.40 26.28 20.22
S.D. 5.02 5.45 3.08 1.90 2.14 2.06 1.46 2.22 2.50 3.14 5.23 5.71 4.91
SKEW -0.36 -0.81 -0.83 -0.15 0.02 -1.00 -0.76 -0.11 -0.05 -0.62 -1.49 -1.24 -0.41
MAX 33.00 35.00 37.00 39.00 46.00 50.00 53.00 56.00 50.00 42.00 35.00 32.00 27.00
MIN 16.00 11.00 23.00 32.00 38.00 42.00 47.00 48.00 41.00 31.00 13.00 12.00 11.00
NO YRS 26 26 26 26 25 25 25 24 25 25 25 25 23