WILMINGTON PORTER RSVR, DELAWARE

Monthly Average 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 44.16 38.28 37.23 50.15 61.94 70.67 75.05 74.52 68.77 57.66 43.93 37.10 54.95
1933 40.44 35.52 39.53 52.02 64.73 72.47 74.16 74.35 69.70 55.61 42.35 34.11 54.58
1934 36.13 20.21 37.97 51.05 64.16 74.05 77.44 71.27 68.85 53.73 a 47.97 34.58 53.12
1935 29.16 32.02 45.69 50.18 58.73 70.05 76.29 73.97 65.15 56.47 48.70 29.63 53.00
1936 28.24 25.02 46.81 49.65 65.10 70.77 75.89 75.79 68.80 57.44 43.02 37.90 53.70
1937 40.90 35.20 37.63 51.02 63.82 72.12 75.69 75.82 65.02 54.34 44.62 34.24 54.20
1938 32.85 36.45 44.95 54.27 60.90 70.28 75.87 76.47 65.67 a 57.27 e 47.73 b 35.73 54.87
1939 31.86 x 38.55 42.06 49.60 63.58 a 72.37 74.48 76.06 68.33 56.21 42.78 36.27 56.39
1940 22.18 32.81 36.34 46.80 60.58 70.27 75.48 70.71 64.78 52.44 44.72 38.95 51.34
1941 30.87 30.23 35.58 55.91 a 64.90 70.72 74.98 73.06 70.23 61.44 48.05 38.76 54.56
1942 31.06 30.69 a 43.81 54.85 65.61 71.37 75.42 72.60 67.90 57.37 46.22 31.31 54.02
1943 31.87 34.77 42.58 47.38 63.35 75.43 74.94 75.23 67.02 54.50 44.30 33.63 53.75
1944 34.40 34.33 38.81 49.92 67.32 71.73 75.85 74.69 68.45 55.24 45.55 31.61 53.99
1945 26.08 33.41 51.48 55.35 60.13 71.03 74.26 71.60 70.13 54.69 47.27 30.05 53.79
1946 34.11 35.02 50.65 50.18 61.61 67.43 73.45 69.60 68.47 59.11 47.87 37.45 54.58
1947 37.73 27.75 36.53 51.45 60.87 68.30 73.69 75.35 67.42 62.19 43.57 33.05 b 53.16
1948 25.31 30.98 42.90 50.57 61.08 70.32 75.00 73.40 66.70 54.24 49.85 36.82 53.10
1949 39.00 38.32 42.69 51.20 62.34 72.18 77.55 a 74.76 64.43 b 60.81 44.35 37.69 55.44
1950 42.50 33.04 37.74 47.63 59.69 69.22 73.33 a 72.03 63.22 58.16 45.58 32.76 52.91
1951 34.98 35.09 41.35 51.67 61.87 69.82 75.02 73.13 66.75 59.00 41.28 37.76 53.98
1952 36.82 a 36.17 f 39.92 53.87 60.44 72.70 77.81 73.65 67.60 52.84 45.97 37.11 56.25
1953 37.19 37.82 43.77 51.75 64.27 71.42 76.06 74.05 67.82 58.66 46.23 39.11 55.68
1954 31.13 40.05 40.98 54.72 59.74 71.05 75.69 72.24 67.70 59.63 43.70 34.65 54.27
1955 30.92 33.79 42.47 54.02 63.87 68.05 79.87 76.68 66.62 58.11 42.85 29.50 53.89
1956 31.08 36.81 37.98 48.85 59.08 71.13 72.73 73.15 64.13 57.13 45.28 41.35 53.23
1957 29.06 36.89 41.65 53.78 62.48 73.87 75.84 72.35 68.23 53.39 46.52 38.32 54.37
1958 30.95 27.39 38.56 52.92 60.10 66.98 76.26 72.55 65.80 54.97 45.80 28.77 51.75
1959 30.87 32.68 40.88 a 54.08 65.39 71.95 75.44 75.57 a 70.40 59.77 44.00 37.94 54.91
1960 34.87 35.84 33.10 56.37 60.71 71.17 73.24 74.53 a 67.53 55.92 46.83 29.16 53.27
1961 26.39 34.95 42.21 48.17 a 58.53 70.03 74.97 73.26 71.85 57.11 46.47 33.18 53.09
1962 31.10 30.55 40.40 51.98 63.42 70.97 71.63 72.05 62.65 56.52 42.28 30.32 51.99
1963 28.08 26.82 43.65 52.57 60.29 70.50 75.31 70.98 62.52 58.97 48.10 28.18 52.16
1964 33.53 31.33 43.10 49.55 64.27 a 71.47 74.98 71.15 66.78 53.29 48.30 37.00 53.73
1965 28.82 33.45 38.23 48.67 64.97 67.87 72.71 72.48 67.65 53.21 45.07 38.21 52.61
1966 28.53 32.16 42.81 47.37 60.31 71.50 76.84 74.81 65.25 53.76 46.07 34.92 52.86
1967 36.29 28.82 38.76 50.93 55.05 71.12 74.19 72.15 64.37 54.66 41.07 36.89 52.02
1968 27.60 29.76 43.85 53.78 59.05 70.47 75.40 75.71 68.95 57.50 45.62 33.08 53.40
1969 29.94 32.27 38.06 54.33 63.47 72.17 74.00 73.58 66.28 54.53 43.47 31.13 52.77
1970 22.65 31.62 36.81 50.22 63.27 69.68 74.44 73.81 69.40 57.76 46.47 34.19 52.53
1971 25.97 34.46 39.56 50.58 60.68 72.63 74.27 72.23 68.98 61.06 43.65 40.21 53.69
1972 34.23 31.05 38.79 48.48 60.55 66.52 74.73 73.06 67.27 51.29 42.23 38.79 52.25
1973 33.52 32.43 46.23 51.47 58.68 73.18 75.45 75.44 67.88 57.32 46.62 37.24 54.62
1974 35.48 30.89 41.95 53.87 60.31 67.55 74.81 73.77 64.78 52.26 45.60 37.34 53.22
1975 35.89 34.95 39.47 46.72 64.66 69.80 74.03 74.84 63.37 57.90 51.02 35.24 53.99
1976 27.69 40.12 44.31 53.23 58.65 72.25 72.20 d 70.55 63.35 51.29 b 39.00 30.21 51.90
1977 20.13 33.61 47.84 54.73 64.26 68.38 75.27 74.45 68.48 53.40 46.50 33.37 53.37
1978 26.73 23.21 37.85 50.67 59.84 70.40 72.76 75.60 65.57 53.52 46.08 37.00 51.60
1979 30.35 22.21 44.92 49.53 62.39 67.30 73.63 73.06 66.30 53.02 49.62 38.82 52.60
1980 32.23 29.91 39.37 54.37 65.34 69.33 77.94 77.60 71.17 53.89 42.65 32.27 53.84
1981 25.50 37.39 39.58 54.72 61.90 72.47 76.03 72.58 65.72 52.89 44.43 33.48 53.06
1982 23.97 34.02 40.63 50.78 66.56 71.45 77.11 71.08 ----- z 55.44 47.25 41.42 52.70
1983 33.52 35.54 43.87 51.67 60.79 71.78 78.18 76.56 68.65 56.50 46.27 32.32 54.64
1984 26.44 38.33 35.34 50.25 60.26 73.03 74.11 75.39 64.58 61.52 45.08 42.48 53.90
1985 27.98 35.16 45.18 54.62 63.98 69.27 75.13 73.47 68.83 58.11 50.38 32.82 54.58
1986 32.23 32.14 43.87 53.00 66.11 72.42 77.40 73.23 67.23 57.39 43.92 37.50 54.70
1987 31.48 32.89 45.08 52.88 64.26 74.38 78.77 74.52 68.38 52.37 47.74 a 39.08 55.15
1988 27.90 34.33 43.63 50.40 63.05 71.78 79.63 77.68 65.73 51.15 47.07 35.03 53.95
1989 36.65 34.59 41.52 51.33 61.45 73.33 75.05 73.63 67.97 58.55 44.38 24.66 53.59
1990 40.29 41.04 45.81 53.32 61.03 71.68 76.11 74.79 66.25 60.42 48.88 41.23 56.74
1991 34.18 39.55 45.05 54.48 69.00 73.37 76.69 76.58 66.98 57.21 45.77 38.97 56.49
1992 35.03 36.74 40.61 51.30 60.08 69.27 75.47 71.61 66.50 52.98 46.47 37.63 53.64
1993 36.92 30.38 38.71 52.25 64.84 71.87 78.24 76.27 67.02 54.82 46.75 35.74 54.48
1994 25.06 30.98 40.66 57.58 59.92 74.88 78.65 71.84 66.32 55.40 50.67 40.76 54.39
1995 37.11 30.84 45.27 a 51.48 62.05 71.45 78.47 76.42 67.62 59.63 41.15 31.29 54.40
1996 29.71 33.33 38.15 52.25 60.15 72.23 73.74 73.87 67.76 a 55.21 40.40 38.87 52.97
1997 30.97 38.68 43.31 50.93 59.16 70.83 76.29 73.58 66.60 56.73 44.17 38.11 54.11
1998 40.82 41.84 45.37 55.23 66.16 70.70 76.34 75.95 70.73 56.39 46.68 40.85 57.26
1999 34.27 36.46 41.00 52.93 63.37 71.67 79.85 75.74 68.08 54.26 49.48 38.44 55.46
2000 30.85 36.24 47.13 51.60 64.10 71.85 72.90 72.53 64.97 56.82 a 43.85 29.15 53.50
2001 31.24 35.86 39.10 53.63 62.97 73.23 72.95 77.48 65.83 56.63 51.52 42.19 55.22
2002 37.71 39.64 43.89 56.02 61.35 71.68 77.35 77.44 69.27 55.13 43.87 33.89 55.60
2003 27.44 28.77 42.71 51.18 57.97 68.43 75.50 76.02 67.73 53.81 49.52 35.26 52.86
2004 24.63 34.02 44.03 53.00 67.98 69.90 74.21 72.77 68.63 54.69 47.00 ----- z 55.53
2005 32.79 35.29 38.29 53.88 58.18 73.37 77.58 77.85 71.88 57.27 48.28 33.11 54.82
2006 39.81 34.32 43.60 55.67 63.02 71.60 78.24 76.56 65.70 54.45 49.85 42.05 56.24
2007 37.05 26.21 42.65 49.67 65.06 72.25 75.26 75.16 69.97 62.45 43.92 36.24 54.66
2008 34.58 34.91 43.21 55.17 59.21 74.87 77.37 72.66 67.93 54.47 43.85 36.61 54.57
2009 27.71 36.70 42.24 53.57 63.39 69.45 73.24 75.97 65.75 54.44 47.77 q 35.13 54.33
2010 30.95 30.75 48.37 56.67 65.58 76.07 79.58 76.61 70.85 56.68 46.43 30.73 55.77
2011 27.76 36.07 41.56 55.35 65.66 73.58 80.35 74.37 68.80 55.69 49.58 41.52 55.86
2012 35.47 a 39.24 50.29 53.17 a 60.88 w ----- z ----- z ----- z ----- z ----- z ----- z ----- z 44.54
Period of Record Statistics
MEAN 31.98 33.57 41.85 52.13 62.31 71.20 75.65 74.12 67.25 56.13 45.79 35.56 53.94
S.D. 5.01 4.23 3.62 2.47 2.66 1.97 1.95 1.93 2.10 2.67 2.62 3.85 1.24
SKEW 0.10 -0.70 0.26 -0.12 0.06 -0.13 0.39 -0.07 -0.07 0.36 -0.04 -0.34 0.24
MAX 44.16 41.84 51.48 57.58 69.00 76.07 80.35 77.85 71.88 62.45 51.52 42.48 57.26
MIN 20.13 20.21 33.10 46.72 55.05 66.52 71.63 69.60 62.52 51.15 39.00 24.66 51.34
NO YRS 80 80 81 81 80 80 80 80 79 80 79 79 75