Royal Slope, Washington
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 23° 35° -26° (1957) 64° (1971) 0.93" NA
February 28° 43° -26° (1950) 67° (1995) 0.82" NA
March 31° 53° 6° (1945) 79° (1960) 0.86" NA
April 36° 61° 16° (1945) 91° (1977) 0.62" NA
May 43° 69° 23° (1954) 99° (1983) 0.73" NA
June 49° 76° 31° (1943) 106° (1961) 0.52" NA
July 54° 83° 34° (1948) 111° (1941) 0.39" NA
August 54° 83° 36° (1980) 114° (1961) 0.33" NA
September 47° 74° 26° (1985) 102° (1950) 0.4" NA
October 37° 61° 14° (1971) 91° (1943) 0.57" NA
November 31° 45° -14° (1985) 73° (1975) 1.04" NA
December 24° 35° -15° (1968) 63° (1959) 1.21" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 51° 79° 38° (1973) 102° (1950) 0.01" NA
Sep 2 51° 79° 41° (1973) 102° (1950) 0.01" NA
Sep 3 51° 79° 37° (1980) 100° (1950) 0.01" NA
Sep 4 50° 78° 33° (1948) 98° (1988) 0.01" NA
Sep 5 50° 78° 34° (1948) 99° (1955) 0.01" NA
Sep 6 50° 78° 36° (1948) 100° (1944) 0.01" NA
Sep 7 49° 77° 36° (1948) 101° (1944) 0.01" NA
Sep 8 49° 77° 36° (1976) 97° (1944) 0.01" NA
Sep 9 49° 77° 37° (1970) 98° (1944) 0.01" NA
Sep 10 48° 76° 36° (1972) 99° (1944) 0.01" NA
Sep 11 48° 76° 36° (1942) 100° (1944) 0.01" NA
Sep 12 48° 76° 35° (1970) 99° (1944) 0.01" NA
Sep 13 48° 75° 32° (1970) 97° (1948) 0.01" NA
Sep 14 47° 75° 33° (1970) 91° (1943) 0.01" NA
Sep 15 47° 75° 33° (1970) 93° (1957) 0.01" NA
Sep 16 47° 74° 33° (1942) 92° (1957) 0.01" NA
Sep 17 46° 74° 29° (1965) 93° (1967) 0.01" NA
Sep 18 46° 73° 30° (1988) 95° (1952) 0.01" NA
Sep 19 46° 73° 31° (1957) 91° (1951) 0.01" NA
Sep 20 45° 73° 33° (1949) 90° (1952) 0.01" NA
Sep 21 45° 72° 32° (1971) 90° (1950) 0.02" NA
Sep 22 45° 72° 30° (1946) 91° (1952) 0.02" NA
Sep 23 44° 72° 30° (1996) 92° (1952) 0.02" NA
Sep 24 44° 71° 31° (1984) 97° (1952) 0.02" NA
Sep 25 44° 71° 30° (1972) 99° (1952) 0.02" NA
Sep 26 43° 71° 30° (1972) 91° (1952) 0.02" NA
Sep 27 43° 70° 29° (1972) 92° (1963) 0.02" NA
Sep 28 43° 70° 27° (1999) 91° (1963) 0.02" NA
Sep 29 42° 69° 26° (1985) 89° (1963) 0.02" NA
Sep 30 42° 69° 30° (1948) 87° (1976) 0.02" NA
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