December weather in Portales, NM
The average temperature in Portales in December is 40.3°F (26.0°F–54.6°F). Average precipitation: 0.66 inches. Average snowfall is 2.8 inches.
December is a winter month in Portales, and is cooler than the annual average of 60.1°F. Daily temperatures swing about 28.6°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 9h 44m. For travel, December is cool.
Avg High
54.6°F
Avg Low
26.0°F
Precipitation
0.66 in
Snow
2.8 in
December records in Portales
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 75.0°F (1917) | 9.0°F (1979) | 0.60 in (1906) |
| December 2 | 75.9°F (1942) | 10.9°F (1979) | 0.67 in (1997) |
| December 3 | 75.9°F (2010) | 12.9°F (1963) | 0.66 in (1947) |
| December 4 | 78.1°F (1958) | 8.1°F (1921) | 0.55 in (1947) |
| December 5 | 87.1°F (1906) | 6.1°F (1972) | 0.60 in (1926) |
| December 6 | 73.9°F (1939) | -6.0°F (1950) | 0.35 in (1942) |
| December 7 | 73.9°F (1933) | 9.0°F (2005) | 0.23 in (1951) |
| December 8 | 75.0°F (1906) | -4.0°F (2005) | 0.87 in (1951) |
| December 9 | 73.0°F (1970) | -11.9°F (1978) | 1.45 in (1943) |
| December 10 | 73.9°F (1933) | -4.0°F (1978) | 1.21 in (1943) |
| December 11 | 75.9°F (1939) | 0.0°F (1924) | 0.64 in (1911) |
| December 12 | 75.0°F (1921) | -6.0°F (1961) | 0.63 in (1905) |
| December 13 | 77.0°F (1921) | -0.9°F (1985) | 0.50 in (1937) |
| December 14 | 73.9°F (2010) | 6.1°F (1919) | 0.49 in (1967) |
| December 15 | 73.0°F (1946) | -2.0°F (1987) | 0.84 in (1984) |
| December 16 | 72.0°F (1962) | -5.1°F (1987) | 0.75 in (1913) |
| December 17 | 75.0°F (1962) | -2.9°F (1932) | 0.30 in (1918) |
| December 18 | 75.0°F (1980) | -6.0°F (2016) | 0.44 in (1986) |
| December 19 | 75.9°F (2025) | -2.0°F (1924) | 2.41 in (1911) |
| December 20 | 75.9°F (2025) | 0.0°F (1924) | 0.91 in (1997) |
| December 21 | 75.0°F (1981) | -2.0°F (1911) | 1.00 in (1913) |
| December 22 | 79.0°F (2025) | -0.9°F (1989) | 1.53 in (1991) |
| December 23 | 79.0°F (2025) | -8.0°F (1990) | 0.68 in (1997) |
| December 24 | 80.1°F (2025) | -4.0°F (2004) | 0.60 in (1975) |
| December 25 | 77.0°F (2025) | -4.0°F (1924) | 0.70 in (1939) |
| December 26 | 75.0°F (1955) | -0.9°F (1918) | 0.25 in (2000) |
| December 27 | 73.9°F (2025) | -9.0°F (1939) | 0.60 in (2015) |
| December 28 | 73.0°F (1980) | -0.9°F (1924) | 1.00 in (2019) |
| December 29 | 75.0°F (1921) | -5.1°F (1983) | 0.68 in (2006) |
| December 30 | 73.9°F (1965) | -2.0°F (1969) | 1.05 in (2006) |
| December 31 | 71.1°F (1945) | 1.9°F (1969) | 0.62 in (1916) |