May weather in Mason City, IL
The average temperature in Mason City in May is 63.3°F (52.8°F–73.7°F). Average precipitation: 4.47 inches.
May is a spring month in Mason City, and is warmer than the annual average of 51.7°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 14m. For travel, May is a comfortable month to visit.
Avg High
73.7°F
Avg Low
52.8°F
Precipitation
4.47 in
Daylight
14h 14m
May records in Mason City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 87.1°F (1992) | 32.0°F (1978) | 1.44 in (1983) |
| May 2 | 91.9°F (1968) | 30.9°F (1978) | 1.02 in (1977) |
| May 3 | 86.0°F (1965) | 28.9°F (1976) | 0.78 in (1991) |
| May 4 | 84.9°F (1980) | 32.0°F (2005) | 1.12 in (1990) |
| May 5 | 88.0°F (1980) | 36.0°F (1992) | 1.96 in (1991) |
| May 6 | 84.9°F (2000) | 33.1°F (1992) | 2.24 in (1977) |
| May 7 | 89.1°F (1965) | 34.0°F (1992) | 2.51 in (1998) |
| May 8 | 89.1°F (1963) | 34.0°F (1992) | 1.30 in (1973) |
| May 9 | 91.9°F (1963) | 30.0°F (1983) | 0.90 in (1950) |
| May 10 | 89.1°F (1963) | 36.0°F (1969) | 1.75 in (1981) |
| May 11 | 90.0°F (2000) | 37.0°F (1997) | 2.76 in (1970) |
| May 12 | 89.1°F (2000) | 36.0°F (1981) | 1.17 in (1990) |
| May 13 | 88.0°F (1965) | 37.0°F (1971) | 1.45 in (1978) |
| May 14 | 93.0°F (1987) | 37.9°F (2000) | 1.47 in (2004) |
| May 15 | 90.0°F (2001) | 36.0°F (1997) | 0.73 in (1991) |
| May 16 | 91.0°F (2001) | 33.1°F (1997) | 1.21 in (2009) |
| May 17 | 91.0°F (1996) | 34.0°F (1973) | 3.89 in (1995) |
| May 18 | 91.9°F (1996) | 39.0°F (1976) | 1.58 in (1981) |
| May 19 | 93.9°F (1996) | 37.0°F (1968) | 1.70 in (1974) |
| May 20 | 93.9°F (1987) | 34.0°F (2002) | 3.20 in (1984) |
| May 21 | 93.9°F (1987) | 34.0°F (2002) | 1.24 in (1974) |
| May 22 | 91.9°F (1972) | 37.9°F (1963) | 0.69 in (1998) |
| May 23 | 91.0°F (1972) | 34.0°F (1963) | 1.62 in (1968) |
| May 24 | 91.0°F (2010) | 37.9°F (1992) | 2.63 in (1995) |
| May 25 | 96.1°F (1967) | 35.1°F (1992) | 2.71 in (2004) |
| May 26 | 93.0°F (1967) | 39.9°F (1971) | 1.14 in (1997) |
| May 27 | 93.0°F (1967) | 34.0°F (1992) | 1.50 in (1963) |
| May 28 | 91.9°F (1969) | 37.9°F (1992) | 3.00 in (2013) |
| May 29 | 93.9°F (2006) | 37.9°F (1965) | 0.82 in (1978) |
| May 30 | 93.9°F (2006) | 41.0°F (1996) | 3.25 in (1974) |
| May 31 | 91.9°F (1988) | 43.0°F (1972) | 1.13 in (2013) |