RICHLAND, WASHINGTON

Monthly Average Minimum Temperature (Degrees Fahrenheit)

(457015)

File last updated on Apr 4, 2013
*** Note *** Provisional Data *** After Year/Month 201303
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
1944 ----- z ----- z ----- z ----- z 50.62 r 53.57 60.74 57.06 50.87 42.00 33.43 b 25.67 j 49.61
1945 32.52 33.00 35.58 40.60 49.81 54.10 60.45 59.13 48.97 41.23 33.63 27.97 43.08
1946 26.68 29.50 36.97 40.33 48.10 53.90 60.84 58.04 f 49.93 39.63 a 30.63 28.65 40.47
1947 22.84 28.82 35.16 40.93 51.84 54.27 60.74 57.19 52.87 48.03 36.80 30.42 43.33
1948 ----- z ----- z ----- z ----- z ----- z 58.27 54.68 57.16 50.12 e 34.84 l 33.07 22.29 45.93
1949 3.29 23.21 33.19 38.70 50.71 51.57 58.35 57.58 51.43 35.23 36.70 29.03 39.08
1950 7.77 22.71 33.00 37.60 43.65 54.67 57.13 59.58 49.17 42.19 35.66 a 34.19 39.78
1951 28.33 a 28.39 30.84 38.60 47.84 55.07 60.47 a 57.84 50.53 43.87 32.97 23.68 41.54
1952 22.23 31.34 35.65 42.43 51.03 56.30 61.13 64.39 52.80 43.87 27.63 32.61 43.45
1953 39.29 34.43 38.19 41.83 48.29 53.10 59.71 59.74 52.10 43.58 37.10 35.29 45.22
1954 25.06 36.11 31.87 41.07 48.74 53.73 59.26 58.00 49.03 37.48 39.27 30.35 42.50
1955 28.68 29.36 32.32 38.33 45.23 55.60 58.71 57.19 51.30 43.61 27.27 25.90 41.13
1956 27.48 21.17 35.35 41.97 51.39 52.37 61.29 57.23 50.90 42.35 31.60 30.61 41.98
1957 13.13 28.25 35.58 42.10 52.10 56.17 59.58 57.87 53.13 42.13 31.70 34.90 42.22
1958 33.06 38.79 34.42 42.27 54.52 60.23 65.77 62.94 53.73 40.61 35.90 32.26 46.21
1959 27.87 30.86 35.35 41.50 46.16 54.63 59.77 56.71 52.17 42.58 29.10 29.77 42.21
1960 18.52 31.03 35.32 42.87 47.90 54.53 63.16 58.10 51.07 44.06 34.83 26.87 42.36
1961 30.81 39.32 38.94 42.43 48.87 58.07 61.23 62.87 48.93 39.94 26.66 a 29.23 43.94
1962 24.58 30.36 33.81 43.30 48.06 53.47 59.19 57.55 51.50 43.23 38.03 34.45 43.13
1963 20.94 32.68 35.45 41.90 48.81 55.60 57.84 59.00 55.33 44.84 38.30 27.77 43.20
1964 31.68 28.21 33.06 39.10 46.29 54.53 59.23 56.26 50.33 41.19 35.33 24.03 41.60
1965 30.84 33.57 30.58 43.40 46.68 54.50 59.68 60.87 50.20 45.23 40.03 29.26 43.74
1966 31.68 32.86 35.23 41.83 48.06 52.87 57.13 57.29 53.30 40.97 36.93 33.13 43.44
1967 35.06 34.82 35.42 37.80 46.48 55.77 58.52 59.45 53.00 43.68 34.33 28.61 43.58
1968 29.32 33.14 37.35 38.87 49.00 54.73 60.35 57.00 52.13 40.35 35.53 26.71 42.88
1969 16.32 26.89 33.16 41.83 50.03 59.30 56.87 52.77 49.97 36.03 31.67 30.81 40.47
1970 26.61 32.18 31.97 36.87 45.58 56.37 60.03 54.94 45.63 35.48 31.20 25.10 40.16
1971 29.61 28.04 30.68 38.43 47.97 50.77 57.68 59.97 45.20 38.10 32.57 25.52 40.38
1972 25.81 28.93 35.45 36.87 48.81 54.73 58.00 57.81 45.87 36.68 33.63 22.48 40.42
1973 21.55 28.96 34.32 38.53 46.26 52.97 57.35 54.61 50.53 41.68 35.47 34.35 41.38
1974 23.29 34.75 35.94 42.87 47.16 56.27 59.03 59.23 51.23 39.26 37.47 32.10 43.22
1975 28.48 26.46 33.77 36.83 46.35 53.13 62.48 57.10 49.13 43.87 33.27 29.48 41.70
1976 27.61 30.55 32.10 39.63 45.81 51.67 57.84 57.94 53.20 38.61 31.43 24.00 40.87
1977 22.48 32.75 36.90 43.10 a 47.81 59.47 60.71 64.87 51.60 39.97 34.50 31.42 43.80
1978 28.90 33.75 38.19 43.20 47.61 56.47 61.20 a 59.48 51.90 37.61 26.57 23.65 42.38
1979 7.94 28.68 34.97 41.77 49.61 55.07 61.26 61.16 54.03 45.65 32.17 33.45 42.15
1980 20.03 30.55 36.58 42.73 49.97 54.40 60.48 56.65 ----- z 41.35 36.37 32.16 41.93
1981 33.97 32.50 37.29 42.43 49.00 54.47 58.26 60.23 51.33 39.32 34.00 28.06 43.41
1982 26.16 30.63 a 34.94 38.40 46.10 55.87 58.13 57.90 50.57 39.32 29.30 28.26 41.30
1983 31.87 34.71 40.45 38.90 48.32 54.20 60.13 62.52 45.57 37.77 38.13 18.00 42.55
1984 25.06 32.41 38.35 39.57 44.13 52.23 59.32 57.71 47.48 a 37.45 33.83 a 21.69 b 40.77
1985 23.10 22.75 32.81 42.59 a 49.03 54.60 61.58 56.39 48.40 41.48 22.93 19.68 39.61
1986 28.29 32.18 38.94 38.10 a 47.42 57.37 56.71 61.68 51.87 41.81 38.80 29.33 a 43.54
1987 26.29 32.21 38.42 44.07 50.94 54.93 62.33 p 56.65 50.97 37.94 36.37 27.55 41.48
1988 26.77 29.38 35.58 42.93 47.61 54.67 58.68 56.35 49.10 43.87 38.33 27.16 42.54
1989 31.35 17.93 35.42 44.10 48.23 56.30 58.35 57.81 49.33 40.52 37.20 29.32 42.16
1990 34.48 28.54 34.26 43.43 47.29 55.33 61.35 61.29 54.27 41.16 38.37 19.06 43.24
1991 21.23 33.07 32.97 40.90 47.13 51.30 59.32 61.45 51.13 38.61 35.60 32.71 42.12
1992 31.84 33.62 36.26 43.07 48.45 58.00 60.03 58.90 48.90 41.10 34.60 24.35 43.26
1993 18.19 24.68 31.68 41.83 52.55 54.37 56.32 56.84 49.07 41.52 25.67 32.03 40.40
1994 ----- z 29.25 35.35 44.80 50.00 53.37 60.65 ----- z ----- z 42.00 32.20 30.61 42.03
1995 27.42 34.39 ----- z ----- z 49.81 ----- z 60.29 ----- z ----- z ----- z 36.70 30.06 39.78
1996 25.52 22.69 33.77 42.57 45.23 51.67 59.19 56.87 49.43 42.23 31.50 24.42 40.42
1997 25.94 31.50 36.52 39.77 49.65 53.77 58.19 61.16 52.70 41.74 35.13 28.77 42.90
1998 29.13 33.07 36.81 39.00 49.13 55.37 64.39 60.10 54.40 39.87 ----- z 26.81 44.37
1999 32.65 34.64 35.23 37.30 44.35 53.73 56.74 60.87 46.90 39.68 37.97 33.84 42.82
2000 29.10 30.69 34.45 41.87 49.39 53.80 58.16 58.39 50.40 40.45 28.97 27.26 41.91
2001 29.39 28.36 33.83 a 40.73 47.68 52.63 59.42 60.23 ----- z 42.45 35.40 30.58 41.88
2002 32.06 28.04 33.42 41.10 46.29 55.13 60.90 57.71 50.07 37.10 33.60 34.10 42.46
2003 34.29 30.18 39.94 42.77 48.03 54.93 60.58 59.77 52.97 45.87 30.37 29.81 44.13
2004 25.97 29.52 38.06 40.97 49.94 55.73 62.03 62.03 51.43 43.71 32.13 30.71 43.52
2005 26.42 25.04 34.61 42.17 51.00 54.73 59.94 58.35 50.23 45.03 33.70 24.61 42.15
2006 34.45 27.43 35.39 40.90 47.61 55.73 61.81 56.97 50.43 40.65 34.67 26.42 42.70
2007 23.23 32.11 36.87 40.43 47.16 53.90 62.87 57.23 50.70 41.58 32.33 29.45 42.32
2008 23.90 ----- z 33.74 36.73 49.42 52.30 59.68 58.19 50.63 39.97 35.60 20.94 41.92
2009 26.84 28.36 33.06 39.20 46.97 56.57 61.10 60.23 52.43 40.74 33.40 19.26 41.51
2010 33.26 33.43 34.55 41.73 44.90 53.67 59.13 59.10 53.70 43.68 31.20 29.35 43.14
2011 28.71 27.96 35.06 37.07 44.19 52.83 a 56.13 59.48 52.52 a 45.23 30.33 25.74 41.27
2012 25.77 30.62 35.42 41.69 a 46.19 52.87 59.87 58.52 50.43 42.13 37.00 a 32.19 42.73
2013 27.06 29.89 a 35.68 40.00 z ----- z ----- z ----- z ----- z ----- z ----- z ----- z ----- z 30.88
Period of Record Statistics
MEAN 26.42 30.24 35.10 40.81 48.14 54.68 59.66 58.72 50.78 41.23 33.74 28.30 42.29
S.D. 6.50 3.94 2.18 2.13 2.15 1.93 1.95 2.25 2.17 2.68 3.57 4.19 1.36
SKEW -1.31 -0.58 0.15 -0.37 0.28 0.62 0.28 0.44 -0.53 -0.10 -0.68 -0.52 -0.03
MAX 39.29 39.32 40.45 44.80 54.52 60.23 65.77 64.87 55.33 48.03 40.03 35.29 46.21
MIN 3.29 17.93 30.58 36.73 43.65 50.77 54.68 52.77 45.20 35.23 22.93 18.00 39.08
NO YRS 67 67 67 66 67 68 68 66 65 67 68 68 59