Neptune, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 26° -37° (1912) 69° (2002) 0.64" 6.8"
February 12° 33° -35° (1905) 70° (1981) 0.54" 4.8"
March 23° 46° -26° (1960) 87° (1968) 1.95" 7.3"
April 35° 61° -2° (1975) 96° (2002) 2.74" 1.5"
May 47° 73° 17° (1907) 108° (1934) 3.44" 0"
June 58° 82° 33° (1969) 106° (1933) 3.97" 0"
July 62° 86° 38° (1972) 111° (1936) 3.31" 0"
August 59° 83° 35° (1935) 108° (1934) 3.4" 0"
September 49° 76° 22° (1967) 103° (1976) 2.52" 0"
October 36° 63° -7° (1925) 95° (1963) 1.92" 0.8"
November 22° 43° -24° (1959) 80° (1999) 1.37" 3.6"
December 11° 30° -33° (1917) 68° (1998) 0.72" 7.4"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 41° 67° 17° (1907) 93° (1959) 0.1" NA
May 2 42° 68° 18° (1961) 91° (1959) 0.1" NA
May 3 42° 68° 22° (1967) 94° (1949) 0.1" NA
May 4 42° 68° 22° (1907) 93° (1952) 0.1" NA
May 5 43° 69° 26° (1944) 93° (1936) 0.1" NA
May 6 43° 69° 25° (1925) 99° (1934) 0.1" NA
May 7 44° 70° 28° (1907) 92° (1934) 0.1" NA
May 8 44° 70° 24° (1960) 99° (1934) 0.1" NA
May 9 45° 70° 26° (1923) 91° (1987) 0.1" NA
May 10 45° 71° 28° (1909) 91° (1987) 0.11" NA
May 11 46° 71° 25° (1946) 91° (1906) 0.11" NA
May 12 46° 72° 27° (1946) 92° (1907) 0.11" NA
May 13 46° 72° 27° (1997) 93° (1987) 0.11" NA
May 14 47° 72° 27° (1997) 95° (1941) 0.11" NA
May 15 47° 73° 26° (1959) 96° (2001) 0.11" NA
May 16 48° 73° 28° (1929) 98° (2001) 0.11" NA
May 17 48° 73° 27° (1925) 97° (1934) 0.11" NA
May 18 48° 74° 32° (1915) 100° (1934) 0.11" NA
May 19 49° 74° 36° (1916) 100° (1934) 0.11" NA
May 20 49° 74° 28° (1907) 98° (1934) 0.11" NA
May 21 50° 75° 28° (1931) 98° (1973) 0.11" NA
May 22 50° 75° 28° (1963) 98° (1925) 0.12" NA
May 23 50° 75° 28° (1963) 94° (1964) 0.12" NA
May 24 51° 76° 31° (1924) 98° (1939) 0.12" NA
May 25 51° 76° 27° (1925) 103° (1967) 0.12" NA
May 26 52° 77° 32° (1905) 99° (1967) 0.12" NA
May 27 52° 77° 31° (1907) 93° (1969) 0.12" NA
May 28 52° 77° 33° (1906) 96° (1934) 0.12" NA
May 29 53° 78° 25° (1947) 105° (1934) 0.12" NA
May 30 53° 78° 33° (1930) 108° (1934) 0.13" NA
May 31 53° 78° 31° (1897) 103° (1934) 0.13" NA
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