December weather in Grand Terrace, CA
The average temperature in Grand Terrace in December is 56.2°F (43.2°F–69.1°F). Average precipitation: 1.51 inches.
December is a winter month in Grand Terrace, and is cooler than the annual average of 66.6°F. Daily temperatures swing about 25.9°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 45m. For travel, December is a comfortable month to visit.
Avg High
69.1°F
Avg Low
43.2°F
Precipitation
1.51 in
Daylight
9h 45m
December records in Grand Terrace
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 91.9°F (2008) | 32.0°F (1982) | 0.33 in (1967) |
| December 2 | 89.1°F (1959) | 32.0°F (1991) | 1.00 in (1961) |
| December 3 | 84.9°F (1958) | 33.1°F (1991) | 1.36 in (1966) |
| December 4 | 93.0°F (1958) | 33.1°F (1960) | 1.16 in (1974) |
| December 5 | 84.9°F (1965) | 33.1°F (1972) | 1.09 in (1966) |
| December 6 | 86.0°F (1979) | 28.0°F (1978) | 2.32 in (1997) |
| December 7 | 87.1°F (2006) | 28.0°F (1978) | 1.91 in (1992) |
| December 8 | 82.9°F (1975) | 27.0°F (1978) | 0.29 in (1949) |
| December 9 | 84.9°F (1975) | 27.0°F (1960) | 0.50 in (1996) |
| December 10 | 87.1°F (1975) | 32.0°F (1985) | 1.12 in (1965) |
| December 11 | 91.0°F (2004) | 33.1°F (1960) | 0.31 in (1993) |
| December 12 | 90.0°F (1958) | 28.0°F (1972) | 0.06 in (1965) |
| December 13 | 87.1°F (1958) | 30.0°F (1961) | 0.27 in (1975) |
| December 14 | 82.9°F (2004) | 30.0°F (1967) | 0.20 in (1970) |
| December 15 | 82.9°F (1980) | 28.0°F (1987) | 1.10 in (2008) |
| December 16 | 84.9°F (1980) | 33.1°F (1960) | 1.01 in (1988) |
| December 17 | 84.0°F (1958) | 34.0°F (1960) | 1.12 in (2008) |
| December 18 | 87.1°F (1958) | 32.0°F (1968) | 0.75 in (1984) |
| December 19 | 84.0°F (1966) | 28.9°F (1968) | 0.92 in (1984) |
| December 20 | 82.0°F (1960) | 30.9°F (1992) | 0.49 in (1978) |
| December 21 | 90.0°F (2005) | 23.0°F (1968) | 0.59 in (1959) |
| December 22 | 82.0°F (1972) | 24.1°F (1968) | 0.80 in (1982) |
| December 23 | 86.0°F (2005) | 21.9°F (1990) | 0.15 in (1995) |
| December 24 | 87.1°F (2005) | 30.0°F (1968) | 1.24 in (1971) |
| December 25 | 84.9°F (2006) | 30.0°F (1974) | 0.74 in (1959) |
| December 26 | 87.1°F (1980) | 27.0°F (1987) | 0.86 in (1977) |
| December 27 | 81.0°F (1960) | 28.9°F (1968) | 1.03 in (1984) |
| December 28 | 84.9°F (2000) | 27.0°F (1987) | 0.83 in (2004) |
| December 29 | 87.1°F (1963) | 30.9°F (1962) | 1.34 in (2004) |
| December 30 | 84.9°F (1998) | 27.0°F (1969) | 0.89 in (1965) |
| December 31 | 84.0°F (2000) | 30.0°F (1960) | 0.32 in (2004) |