WILMINGTON PORTER RSVR, DELAWARE

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(079605)

File last updated on May 16,
*** Note *** Provisional Data *** After Year/Month 201205
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
1931 ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 9999.00
1932 36.84 29.07 28.03 39.07 51.03 60.57 64.81 64.03 57.67 48.71 34.37 29.19 45.28
1933 32.26 25.96 31.68 42.00 54.65 61.67 64.10 65.19 60.57 45.06 33.63 25.39 45.18
1934 27.81 10.50 27.29 40.07 52.74 64.17 66.94 61.87 60.27 43.81 39.37 26.90 43.48
1935 21.29 23.64 35.00 41.53 48.00 60.13 66.87 64.74 55.50 45.52 41.23 23.48 43.91
1936 21.03 17.17 37.23 38.97 52.68 59.87 65.00 65.81 59.60 48.45 33.87 30.16 44.15
1937 33.35 26.39 29.23 40.83 51.90 61.77 65.32 66.68 54.23 44.61 35.37 26.71 44.70
1938 25.55 27.43 34.16 42.60 50.58 59.63 66.16 65.97 55.97 46.39 c 37.30 28.10 44.99
1939 23.81 j 28.82 31.68 39.77 51.47 a 61.37 64.10 66.13 57.57 45.35 33.47 27.97 46.15
1940 13.71 25.24 28.10 36.80 49.32 58.97 64.29 61.45 53.77 42.32 36.97 30.71 41.80
1941 23.84 22.00 26.26 43.52 a 51.68 60.10 65.03 60.94 56.90 49.71 37.33 29.90 43.93
1942 22.55 22.43 33.55 42.37 53.58 61.10 65.16 63.19 57.27 47.45 36.07 23.65 44.03
1943 24.29 24.32 30.71 35.47 51.94 64.73 64.26 63.23 54.33 43.97 34.07 23.29 42.88
1944 25.35 25.62 28.81 38.57 54.90 60.73 63.74 62.81 58.00 43.97 36.13 23.03 43.47
1945 17.45 24.25 38.77 42.77 48.68 59.67 65.32 60.74 59.77 44.13 38.57 23.61 43.64
1946 25.77 25.11 39.52 39.47 51.87 57.20 63.19 60.23 57.63 48.52 38.63 27.97 44.59
1947 29.48 19.29 28.32 41.00 50.68 58.90 65.03 66.06 57.87 51.45 35.23 24.52 43.99
1948 18.61 22.34 32.39 40.60 52.39 60.37 65.97 64.13 55.93 44.90 41.37 29.45 44.04
1949 31.35 29.68 33.19 41.53 52.00 62.27 68.67 a 65.10 54.82 b 52.26 35.13 29.55 46.30
1950 33.35 26.39 28.16 37.87 50.65 59.47 64.10 62.61 55.33 48.58 36.33 25.23 44.01
1951 26.58 26.57 32.71 41.37 51.39 60.50 65.48 63.13 56.03 49.84 32.20 29.55 44.61
1952 29.27 a 28.87 f 32.19 45.20 51.13 63.00 68.23 65.23 57.37 41.58 38.10 29.94 47.38
1953 30.32 29.25 35.97 43.10 55.39 61.40 65.90 63.61 57.47 47.58 37.67 31.23 46.57
1954 22.65 30.96 31.77 43.70 50.26 60.67 64.39 63.94 58.63 50.65 36.17 27.87 45.14
1955 24.06 24.93 33.32 44.50 53.19 58.93 70.32 68.35 57.80 48.81 34.27 21.87 45.03
1956 24.48 29.45 30.39 39.13 47.97 61.37 64.42 64.35 55.17 48.23 36.93 33.55 44.62
1957 21.35 29.96 33.81 43.90 51.87 64.23 64.97 62.00 59.90 44.61 38.83 31.55 45.58
1958 24.52 20.75 32.29 43.97 50.74 57.13 68.06 64.13 56.03 46.16 37.87 21.13 43.57
1959 22.13 23.68 31.00 a 43.77 54.87 61.93 67.03 67.17 a 61.07 51.71 35.37 30.77 45.87
1960 28.84 28.24 25.23 44.83 51.19 61.97 64.35 66.40 a 59.70 46.58 37.77 20.42 44.63
1961 18.81 27.50 33.81 38.93 49.03 60.67 66.19 65.00 63.17 47.10 38.77 26.39 44.61
1962 23.32 23.89 31.68 42.53 53.45 62.17 62.23 63.06 53.53 46.65 34.57 23.19 43.36
1963 20.71 18.18 34.77 42.17 49.29 60.10 65.26 61.65 52.90 47.45 40.53 21.81 42.90
1964 25.06 23.90 33.03 40.53 52.93 a 60.37 65.97 61.45 56.30 43.65 38.27 29.13 44.22
1965 19.84 23.82 29.61 39.47 53.48 56.47 62.52 62.74 57.83 42.81 36.97 30.42 43.00
1966 20.87 24.29 33.45 38.83 49.23 59.53 66.06 64.68 56.50 43.65 37.00 27.74 43.49
1967 28.39 20.07 30.06 40.20 45.74 60.10 65.23 64.45 54.63 44.71 33.27 29.61 43.04
1968 19.87 21.21 34.23 42.83 49.48 59.60 65.68 65.71 58.90 48.39 38.53 25.71 44.18
1969 23.13 26.18 29.29 43.60 52.00 62.63 65.55 64.03 56.40 44.10 35.03 24.26 43.85
1970 14.19 22.29 29.00 39.73 52.39 60.07 65.55 63.68 58.83 48.65 38.37 26.29 43.25
1971 17.42 26.18 31.23 38.83 50.16 62.03 63.77 62.32 60.80 53.06 34.90 31.58 44.36
1972 25.81 22.17 29.10 37.60 50.00 57.57 65.42 63.03 58.27 41.32 34.40 32.16 43.07
1973 24.87 23.21 37.55 41.83 49.42 64.27 65.90 66.39 57.33 46.45 36.83 28.87 45.24
1974 28.00 21.75 31.97 42.17 50.10 58.37 64.97 64.65 55.13 41.45 36.13 29.16 43.65
1975 28.19 27.50 30.16 36.73 54.68 60.50 64.84 65.68 53.83 47.81 41.27 27.13 44.86
1976 19.84 28.83 33.61 41.33 46.68 61.40 62.11 d 58.61 51.70 42.24 b 29.67 22.29 41.53
1977 12.29 25.11 38.87 43.90 53.39 59.17 64.97 65.10 60.10 44.42 39.43 25.55 44.36
1978 18.58 14.86 29.29 40.37 51.23 60.90 64.45 67.29 55.10 42.52 37.77 27.81 42.51
1979 21.94 14.50 34.10 40.20 53.32 57.97 64.77 64.42 57.47 43.87 41.10 30.77 43.70
1980 25.52 21.86 31.06 45.67 55.52 59.97 69.39 68.35 61.77 44.77 34.33 23.45 45.14
1981 18.00 28.07 31.03 44.70 51.68 64.33 67.55 64.03 57.17 43.58 36.33 27.00 44.46
1982 16.35 26.61 32.26 41.00 57.77 63.90 68.61 61.74 ----- z 44.90 37.60 33.68 44.04
1983 26.87 28.04 36.52 43.20 51.32 62.07 67.61 66.32 57.57 48.29 37.13 23.97 45.74
1984 18.90 29.83 27.16 40.93 50.90 62.00 64.42 67.32 54.70 53.06 35.70 34.90 44.99
1985 20.23 27.18 35.68 43.00 54.19 60.67 65.13 65.03 59.40 48.97 42.87 24.74 45.59
1986 23.90 26.39 32.84 43.53 55.74 62.80 68.84 64.00 58.77 49.06 35.53 30.74 46.01
1987 25.26 25.75 34.71 44.13 54.26 65.07 69.45 65.81 60.10 42.32 38.57 31.87 46.44
1988 20.48 26.59 33.65 41.93 53.87 61.17 69.65 68.77 57.13 42.16 38.30 26.84 45.04
1989 29.48 27.39 33.03 41.90 52.84 65.47 66.81 65.97 59.70 48.77 36.27 17.55 45.43
1990 32.68 31.79 36.39 44.23 52.65 62.47 67.94 66.58 57.43 51.26 39.43 32.90 47.98
1991 26.58 31.11 37.06 45.50 58.13 63.13 68.74 67.68 57.03 47.16 38.57 31.42 47.68
1992 27.61 29.07 33.16 42.43 50.94 60.27 67.81 63.29 58.73 43.77 39.87 31.16 45.68
1993 30.52 22.57 31.90 42.93 55.65 62.57 69.81 66.90 58.67 46.19 37.60 29.13 46.20
1994 18.16 23.68 33.32 47.50 50.10 65.57 70.35 63.19 57.63 45.87 42.03 33.23 45.89
1995 31.03 23.36 36.03 a 41.47 52.94 63.03 69.90 66.81 58.63 49.87 33.47 24.77 45.94
1996 22.35 26.03 29.03 42.80 51.03 63.57 65.81 65.16 59.86 a 45.84 32.17 32.03 44.64
1997 23.26 29.86 34.35 41.40 49.29 61.30 67.00 64.74 57.90 47.42 37.73 31.35 45.47
1998 34.23 34.89 37.74 45.90 57.29 62.20 67.45 66.58 61.63 48.58 38.53 33.90 49.08
1999 26.61 28.82 32.19 43.50 53.97 62.37 70.06 67.23 60.63 45.68 41.77 31.84 47.06
2000 23.77 28.45 37.55 42.90 54.90 62.73 65.06 65.19 56.37 47.87 a 36.63 22.26 45.31
2001 24.81 28.14 31.94 44.10 53.58 64.77 63.90 68.94 56.93 47.03 42.13 34.77 46.75
2002 31.06 30.93 34.97 46.43 51.52 62.10 68.48 68.39 60.47 48.61 37.07 27.58 47.30
2003 21.48 22.71 33.48 41.83 50.71 60.90 67.55 68.77 60.73 45.58 41.83 28.58 45.35
2004 18.71 26.45 36.35 43.83 59.26 61.63 66.74 65.29 61.00 47.87 39.63 ----- z 47.89
2005 25.84 28.21 30.90 44.10 49.03 64.90 69.77 70.29 63.03 50.55 39.83 26.84 46.94
2006 32.52 26.89 35.39 46.07 53.13 63.27 70.10 68.48 58.37 46.26 43.37 34.42 48.19
2007 30.00 20.11 33.13 41.23 54.81 63.50 66.55 67.26 60.97 54.45 36.83 31.10 46.66
2008 27.94 27.21 34.74 46.33 49.52 65.50 68.06 63.71 60.50 45.74 37.13 28.68 46.26
2009 20.23 27.64 33.10 43.83 55.00 61.80 64.55 68.77 58.43 46.45 34.15 q 28.81 46.24
2010 24.81 23.39 40.32 46.60 56.42 65.33 70.87 69.16 61.57 48.52 39.17 24.90 47.59
2011 22.19 27.68 33.42 46.20 56.55 65.17 70.97 66.35 61.60 48.06 41.57 32.55 47.69
2012 27.37 a 31.24 40.48 41.76 a 51.62 w ----- z ----- z ----- z ----- z ----- z ----- z ----- z 35.21
Period of Record Statistics
MEAN 24.47 25.41 32.85 42.14 52.24 61.54 66.34 64.99 57.92 46.70 37.36 28.02 44.96
S.D. 5.08 4.14 3.27 2.51 2.62 2.13 2.17 2.35 2.44 2.93 2.72 3.80 1.52
SKEW 0.04 -0.91 0.13 -0.24 0.25 0.00 0.40 -0.11 -0.15 0.30 -0.04 -0.32 0.34
MAX 36.84 34.89 40.48 47.50 59.26 65.57 70.97 70.29 63.17 54.45 43.37 34.90 49.08
MIN 12.29 10.50 25.23 35.47 45.74 56.47 62.11 58.61 51.70 41.32 29.67 17.55 41.53
NO YRS 80 80 81 81 80 80 80 80 79 80 79 79 75