WILMINGTON PORTER RSVR, DELAWARE

Monthly Average Maximum 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 51.48 47.48 46.42 61.23 72.84 80.77 85.29 85.00 79.87 66.61 53.50 45.00 64.62
1933 48.61 45.07 47.39 62.03 74.81 83.27 84.23 83.52 78.83 66.16 51.07 42.84 63.98
1934 44.45 29.93 48.65 62.03 75.58 83.93 87.94 80.68 77.43 63.40 a 56.57 42.26 62.74
1935 37.03 40.39 56.39 58.83 69.45 79.97 85.71 83.19 74.80 67.42 56.17 35.77 62.09
1936 35.45 32.86 56.39 60.33 77.52 81.67 86.77 85.77 78.00 66.42 52.17 45.65 63.25
1937 48.45 44.00 46.03 61.20 75.74 82.47 86.06 84.97 75.80 64.06 53.87 41.77 63.70
1938 40.16 45.46 55.74 65.93 71.23 80.93 85.58 86.97 75.59 a 68.31 b 57.86 b 43.35 64.76
1939 37.90 u 48.29 52.45 59.43 76.13 83.37 84.87 86.00 79.10 67.06 52.10 44.58 66.67
1940 30.65 40.38 44.58 56.80 71.84 81.57 86.68 79.97 75.80 62.55 52.47 47.19 60.87
1941 37.90 38.46 44.90 68.93 78.13 81.33 84.94 85.19 83.57 73.16 58.77 47.61 65.24
1942 39.58 38.78 a 54.06 67.33 77.65 81.63 85.68 82.00 78.53 67.29 56.37 38.97 63.99
1943 39.45 45.21 54.45 59.30 74.77 86.13 85.61 87.23 79.70 65.03 54.53 43.97 64.62
1944 43.45 43.03 48.81 61.27 79.74 82.73 87.97 86.58 78.90 66.52 54.97 40.19 64.51
1945 34.71 42.57 64.19 67.93 71.58 82.40 83.19 82.45 80.50 65.26 55.97 36.48 63.94
1946 42.45 44.93 61.77 60.90 71.35 77.67 83.71 78.97 79.30 69.71 57.10 46.94 64.57
1947 45.97 36.21 44.74 61.90 71.06 77.70 82.35 84.65 76.97 72.94 51.90 41.28 b 62.31
1948 32.00 39.62 53.42 60.53 69.77 80.27 84.03 82.68 77.47 63.58 58.33 44.19 62.16
1949 46.65 46.96 52.19 60.87 72.68 82.10 86.68 84.42 74.04 b 69.35 53.57 45.84 64.61
1950 51.65 39.68 47.32 57.40 68.74 78.97 82.73 a 81.45 71.10 67.74 54.83 40.29 61.83
1951 43.39 43.61 50.00 61.97 72.35 79.13 84.55 83.13 77.47 68.16 50.37 45.97 63.34
1952 44.37 a 43.48 f 47.65 62.53 69.74 82.40 87.39 82.06 77.83 64.10 53.83 44.29 65.11
1953 44.06 46.39 51.58 60.40 73.16 81.43 86.23 84.48 78.17 69.74 54.80 47.00 64.79
1954 39.61 49.14 50.19 65.73 69.23 81.43 87.00 80.55 76.77 68.61 51.23 41.42 63.41
1955 37.77 42.64 51.61 63.53 74.55 77.17 89.42 85.00 75.43 67.42 51.43 37.13 62.76
1956 37.68 44.17 45.58 58.57 70.19 80.90 81.03 81.94 73.10 66.03 53.63 49.16 61.83
1957 36.77 43.82 49.48 63.67 73.10 83.50 86.71 82.71 76.57 62.16 54.20 45.10 63.15
1958 37.39 34.04 44.84 61.87 69.45 76.83 84.45 80.97 75.57 63.77 53.73 36.42 59.94
1959 39.61 41.68 50.77 a 64.40 75.90 81.97 83.84 83.97 a 79.73 67.84 52.63 45.10 63.95
1960 40.90 43.45 40.97 67.90 70.23 80.37 82.13 82.81 75.37 65.26 55.90 37.90 61.93
1961 33.97 42.39 50.61 57.34 a 68.03 79.40 83.74 81.52 80.53 67.13 54.17 39.97 61.57
1962 38.87 37.21 49.13 61.43 73.39 79.77 81.03 81.03 71.77 66.39 50.00 37.45 60.62
1963 35.45 35.46 52.52 62.97 71.29 80.90 85.35 80.32 72.13 70.48 55.67 34.55 61.42
1964 42.00 38.76 53.16 58.57 75.60 a 82.57 84.00 80.84 77.27 62.94 58.33 44.87 63.24
1965 37.81 43.07 46.84 57.87 76.45 79.27 82.90 82.23 77.47 63.61 53.17 46.00 62.22
1966 36.19 40.04 52.16 55.90 71.39 83.47 87.61 84.94 74.00 63.87 55.13 42.10 62.23
1967 44.19 37.57 47.45 61.67 64.35 82.13 83.16 79.84 74.10 64.61 48.87 44.16 61.01
1968 35.32 38.31 53.48 64.73 68.61 81.33 85.13 85.71 79.00 66.61 52.70 40.45 62.62
1969 36.74 38.36 46.84 65.07 74.94 81.70 82.45 83.13 76.17 64.97 51.90 38.00 61.69
1970 31.10 40.96 44.61 60.70 74.16 79.30 83.32 83.94 79.97 66.87 54.57 42.10 61.80
1971 34.52 42.75 47.90 62.33 71.19 83.23 84.77 82.13 77.17 69.06 52.40 48.84 63.03
1972 42.65 39.93 48.48 59.37 71.10 75.47 84.03 83.10 76.27 61.26 50.07 45.42 61.43
1973 42.16 41.64 54.90 61.10 67.94 82.10 85.00 84.48 78.43 68.19 56.40 45.61 64.00
1974 42.97 40.04 51.94 65.57 70.52 76.73 84.65 82.90 74.43 63.06 55.07 45.52 62.78
1975 43.58 42.39 48.77 56.70 74.65 79.10 83.23 84.00 72.90 68.00 60.77 43.35 63.12
1976 35.55 51.41 55.00 65.13 70.61 83.10 81.90 82.48 75.00 60.10 48.33 38.13 62.23
1977 27.97 42.11 56.81 65.57 75.13 77.60 85.58 83.81 76.87 62.39 53.57 41.19 62.38
1978 34.87 31.57 46.42 60.97 68.45 79.90 81.06 83.90 76.03 64.52 54.40 46.19 60.69
1979 38.77 29.93 55.74 58.87 71.45 76.63 82.48 81.71 75.13 62.16 58.13 46.87 61.49
1980 38.94 37.97 47.68 63.07 75.16 78.70 86.48 86.84 80.57 63.00 50.97 41.10 62.54
1981 33.00 46.71 48.13 64.73 72.13 80.60 84.52 81.13 74.27 62.19 52.53 39.97 61.66
1982 31.58 41.43 49.00 60.57 75.35 79.00 85.61 80.42 ----- z 65.97 56.90 49.16 61.36
1983 40.16 43.04 51.23 60.13 70.26 81.50 88.74 86.81 79.73 64.71 55.40 40.68 63.53
1984 33.97 46.83 43.52 59.57 69.61 84.07 83.81 83.45 74.47 69.97 54.47 50.06 62.82
1985 35.74 43.14 54.68 66.23 73.77 77.87 85.13 81.90 78.27 67.26 57.90 40.90 63.57
1986 40.55 37.89 54.90 62.47 76.48 82.03 85.97 82.45 75.70 65.71 52.30 44.26 63.39
1987 37.71 40.04 55.45 61.63 74.26 83.70 88.10 83.23 76.67 62.42 56.86 a 46.29 63.86
1988 35.32 42.07 53.61 58.87 72.23 82.40 89.61 86.58 74.33 60.13 55.83 43.23 62.85
1989 43.81 41.79 50.00 60.77 70.06 81.20 83.29 81.29 76.23 68.32 52.50 31.77 61.75
1990 47.90 50.29 55.23 62.40 69.42 80.90 84.29 83.00 75.07 69.58 58.33 49.55 65.50
1991 41.77 48.00 53.03 63.47 79.87 83.60 84.65 85.48 76.93 67.26 52.97 46.52 65.30
1992 42.45 44.41 48.06 60.17 69.23 78.27 83.13 79.94 74.27 62.19 53.07 44.10 61.61
1993 43.32 38.18 45.52 61.57 74.03 81.17 86.68 85.65 75.37 63.45 55.90 42.35 62.76
1994 31.97 38.29 48.00 67.67 69.74 84.20 86.94 80.48 75.00 64.94 59.30 48.29 62.90
1995 43.19 38.32 54.50 a 61.50 71.16 79.87 87.03 86.03 76.60 69.39 48.83 37.81 62.85
1996 37.06 40.62 47.26 61.70 69.26 80.90 81.68 82.58 75.66 a 64.58 48.63 45.71 61.30
1997 38.68 47.50 52.26 60.47 69.03 80.37 85.58 82.42 75.30 66.03 50.60 44.87 62.76
1998 47.42 48.79 53.00 64.57 75.03 79.20 85.23 85.32 79.83 64.19 54.83 47.81 65.43
1999 41.94 44.11 49.81 62.37 72.77 80.97 89.65 84.26 75.53 62.84 57.20 45.03 63.87
2000 37.94 44.03 56.71 60.30 73.29 80.97 80.74 79.87 73.57 65.55 51.07 36.03 61.67
2001 37.68 43.57 46.26 63.17 72.35 81.70 82.00 86.03 74.73 66.23 60.90 49.61 63.69
2002 44.35 48.36 52.81 65.60 71.19 81.27 86.23 86.48 78.07 61.65 50.67 40.19 63.91
2003 33.39 34.82 51.94 60.53 65.23 75.97 83.45 83.26 74.73 62.03 57.20 41.94 60.37
2004 30.55 41.59 51.71 62.17 76.71 78.17 81.68 80.26 76.27 61.52 54.37 ----- z 63.18
2005 39.74 42.36 45.68 63.67 67.32 81.83 85.39 85.42 80.73 64.00 56.73 39.39 62.69
2006 47.10 41.75 51.81 65.27 72.90 79.93 86.39 84.65 73.03 62.65 56.33 49.68 64.29
2007 44.10 32.32 52.16 58.10 75.32 81.00 83.97 83.06 78.97 70.45 51.00 41.39 62.65
2008 41.23 42.62 51.68 64.00 68.90 84.23 86.68 81.61 75.37 63.19 50.57 44.55 62.89
2009 35.19 45.75 51.39 63.30 71.77 77.10 81.94 83.16 73.07 62.42 61.38 q 41.45 62.41
2010 37.10 38.11 56.42 66.73 74.74 86.80 88.29 84.06 80.13 64.84 53.70 36.55 63.96
2011 33.32 44.46 49.71 64.50 74.77 82.00 89.74 82.39 76.00 63.32 57.60 50.48 64.03
2012 43.81 47.24 60.10 64.59 a 70.12 w ----- z ----- z ----- z ----- z ----- z ----- z ----- z 53.93
Period of Record Statistics
MEAN 39.48 41.73 50.85 62.13 72.39 80.86 84.96 83.26 76.59 65.55 54.21 43.10 62.92
S.D. 5.07 4.56 4.28 2.87 3.13 2.27 2.18 2.04 2.42 2.86 2.87 4.11 1.28
SKEW 0.16 -0.43 0.40 0.18 0.07 -0.14 0.15 0.10 0.20 0.38 0.06 -0.36 0.06
MAX 51.65 51.41 64.19 68.93 79.87 86.80 89.74 87.23 83.57 73.16 60.90 50.48 65.50
MIN 27.97 29.93 40.97 55.90 64.35 75.47 80.74 78.97 71.10 60.10 48.33 31.77 59.94
NO YRS 80 80 81 81 80 80 80 80 79 80 79 79 75