Waterloo Weather in December
Average highs run from 59°F on December 1 to 56°F on December 31, and lows from 40°F to 39°F. Normal precipitation for the month is 3.63 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
- 57°F
- Average low
- 39°F
- Precipitation
- 3.63 in
- Record high
- 76°FDec 7, 2020
- Record low
- 17°FDec 22, 1990
- Chance of a freeze
- 79%
- Daylight
- 9 h 43 min to 9 h 34 min
- Cloud cover
- 59%
- Humidity
- 73%
- Dew point
- 38°F
- Wind
- 6.5 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 59°F | 40°F | 71°F 1995 | 27°F 1969 | 31% |
| Dec 2 | 59°F | 40°F | 70°F 1958 | 28°F 2004 | 31% |
| Dec 3 | 59°F | 40°F | 71°F 1959 | 26°F 2004 | 31% |
| Dec 4 | 58°F | 40°F | 73°F 1958 | 26°F 1968 | 32% |
| Dec 5 | 58°F | 39°F | 71°F 1995 | 23°F 2013 | 32% |
| Dec 6 | 58°F | 39°F | 71°F 2014 | 23°F 2009 | 33% |
| Dec 7 | 58°F | 39°F | 76°F 2020 | 28°F 2011 | 33% |
| Dec 8 | 57°F | 39°F | 69°F 1979 | 22°F 1978 | 33% |
| Dec 9 | 57°F | 39°F | 69°F 2006 | 22°F 2013 | 34% |
| Dec 10 | 57°F | 39°F | 72°F 1987 | 24°F 2013 | 34% |
| Dec 11 | 57°F | 39°F | 71°F 1958 | 24°F 1972 | 34% |
| Dec 12 | 57°F | 39°F | 69°F 1958 | 25°F 1949 | 35% |
| Dec 13 | 57°F | 39°F | 67°F 1969 | 24°F 1949 | 35% |
| Dec 14 | 56°F | 38°F | 68°F 1958 | 26°F 1980 | 35% |
| Dec 15 | 56°F | 38°F | 69°F 1958 | 24°F 1975 | 36% |
| Dec 16 | 56°F | 38°F | 70°F 1958 | 25°F 1975 | 36% |
| Dec 17 | 56°F | 38°F | 71°F 1958 | 24°F 1965 | 36% |
| Dec 18 | 56°F | 38°F | 67°F 1958 | 26°F 1965 | 36% |
| Dec 19 | 56°F | 38°F | 70°F 1981 | 22°F 1965 | 36% |
| Dec 20 | 56°F | 38°F | 68°F 1969 | 25°F 1965 | 37% |
| Dec 21 | 56°F | 38°F | 66°F 2014 | 21°F 1990 | 37% |
| Dec 22 | 56°F | 38°F | 68°F 2023 | 17°F 1990 | 37% |
| Dec 23 | 56°F | 38°F | 67°F 1964 | 20°F 1990 | 37% |
| Dec 24 | 56°F | 38°F | 65°F 1964 | 19°F 1990 | 37% |
| Dec 25 | 56°F | 38°F | 64°F 1955 | 20°F 1990 | 37% |
| Dec 26 | 56°F | 38°F | 65°F 2013 | 23°F 2011 | 37% |
| Dec 27 | 56°F | 38°F | 68°F 1953 | 22°F 1956 | 38% |
| Dec 28 | 56°F | 39°F | 66°F 2017 | 25°F 1960 | 38% |
| Dec 29 | 56°F | 39°F | 68°F 2023 | 25°F 1976 | 38% |
| Dec 30 | 56°F | 39°F | 63°F 2017 | 22°F 1990 | 38% |
| Dec 31 | 56°F | 39°F | 67°F 1996 | 24°F 1953 | 38% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:02 AM, sunset 4:45 PM
- December 31
- sunrise 7:21 AM, sunset 4:55 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00045032 (Lodi), public domain. Records: NOAA GHCN-Daily, station USW00023237, 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.