Waterloo Weather in December
Average highs run from 38°F on December 1 to 29°F on December 31, and lows from 22°F to 13°F. Normal precipitation for the month is 1.77 in over about 11 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 33°F
- Average low
- 18°F
- Precipitation
- 1.77 in
- Snowfall
- 10.9 in
- Record high
- 66°FDec 6, 2001
- Record low
- -27°FDec 4, 1893
- Chance of a freeze
- 100%
- Daylight
- 9 h 14 min to 9 h 02 min
- Cloud cover
- 67%
- Humidity
- 88%
- Dew point
- 20°F
- Wind
- 11.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 38°F | 22°F | 62°F 1970 | -23°F 1893 | 30% | 13% |
| Dec 2 | 38°F | 22°F | 61°F 1962 | -21°F 1893 | 31% | 14% |
| Dec 3 | 37°F | 22°F | 62°F 1982 | -16°F 1940 | 31% | 14% |
| Dec 4 | 37°F | 21°F | 64°F 1998 | -27°F 1893 | 31% | 15% |
| Dec 5 | 36°F | 21°F | 60°F 1960 | -3°F 2005 | 31% | 15% |
| Dec 6 | 36°F | 21°F | 66°F 2001 | -15°F 1893 | 31% | 15% |
| Dec 7 | 36°F | 20°F | 59°F 1894 | -23°F 1893 | 31% | 16% |
| Dec 8 | 35°F | 20°F | 60°F 1946 | -9°F 1917 | 32% | 16% |
| Dec 9 | 35°F | 20°F | 61°F 1946 | -11°F 1958 | 32% | 16% |
| Dec 10 | 35°F | 19°F | 54°F 1911 | -13°F 1919 | 32% | 17% |
| Dec 11 | 34°F | 19°F | 57°F 1949 | -15°F 1893 | 32% | 17% |
| Dec 12 | 34°F | 19°F | 58°F 1949 | -10°F 2013 | 32% | 17% |
| Dec 13 | 34°F | 18°F | 56°F 1991 | -27°F 1893 | 33% | 17% |
| Dec 14 | 33°F | 18°F | 60°F 2015 | -18°F 1901 | 33% | 17% |
| Dec 15 | 33°F | 18°F | 57°F 2015 | -17°F 1901 | 33% | 18% |
| Dec 16 | 33°F | 17°F | 65°F 2021 | -12°F 1932 | 33% | 18% |
| Dec 17 | 32°F | 17°F | 55°F 1984 | -17°F 1903 | 33% | 18% |
| Dec 18 | 32°F | 17°F | 53°F 1923 | -16°F 1983 | 33% | 18% |
| Dec 19 | 32°F | 16°F | 54°F 2002 | -23°F 1983 | 33% | 18% |
| Dec 20 | 31°F | 16°F | 56°F 1918 | -22°F 1983 | 34% | 18% |
| Dec 21 | 31°F | 16°F | 54°F 1967 | -19°F 1989 | 34% | 19% |
| Dec 22 | 31°F | 16°F | 52°F 1957 | -19°F 1989 | 34% | 19% |
| Dec 23 | 31°F | 15°F | 53°F 1941 | -20°F 1983 | 34% | 19% |
| Dec 24 | 30°F | 15°F | 57°F 2015 | -27°F 1983 | 34% | 19% |
| Dec 25 | 30°F | 15°F | 57°F 1982 | -23°F 2000 | 34% | 19% |
| Dec 26 | 30°F | 14°F | 58°F 1982 | -23°F 1914 | 34% | 19% |
| Dec 27 | 30°F | 14°F | 49°F 1946 | -20°F 1933 | 34% | 19% |
| Dec 28 | 30°F | 14°F | 52°F 1982 | -19°F 1924 | 34% | 19% |
| Dec 29 | 29°F | 14°F | 61°F 1984 | -15°F 1917 | 34% | 20% |
| Dec 30 | 29°F | 13°F | 55°F 1936 | -13°F 1909 | 34% | 20% |
| Dec 31 | 29°F | 13°F | 55°F 1965 | -16°F 1963 | 34% | 20% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:08 AM, sunset 4:22 PM
- December 31
- sunrise 7:28 AM, sunset 4:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00478910 (Waterloo Wwtp), public domain. Records: NOAA GHCN-Daily, station USC00478919, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.