Grand Coulee Weather in January
Average highs run from 31°F on January 1 to 35°F on January 31, and lows from 23°F to 24°F. Normal precipitation for the month is 1.15 in over about 11 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 33°F
- Average low
- 23°F
- Precipitation
- 1.15 in
- Record high
- 57°FJan 31, 1971
- Record low
- -17°FJan 30, 1950
- Chance of a freeze
- 100%
- Daylight
- 8 h 28 min to 9 h 30 min
- Cloud cover
- 69%
- Humidity
- 94%
- Dew point
- 22°F
- Wind
- 6.0 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 |
|---|---|---|---|---|---|
| Jan 1 | 31°F | 23°F | 51°F 1939 | -8°F 1952 | 38% |
| Jan 2 | 31°F | 23°F | 49°F 1939 | -6°F 1993 | 38% |
| Jan 3 | 31°F | 23°F | 47°F 1989 | -10°F 1950 | 38% |
| Jan 4 | 32°F | 23°F | 47°F 2020 | -6°F 1950 | 38% |
| Jan 5 | 32°F | 23°F | 51°F 1954 | -5°F 1979 | 38% |
| Jan 6 | 32°F | 23°F | 47°F 1990 | -7°F 1993 | 38% |
| Jan 7 | 32°F | 23°F | 54°F 1945 | -10°F 1979 | 38% |
| Jan 8 | 32°F | 23°F | 51°F 2002 | -6°F 1979 | 37% |
| Jan 9 | 32°F | 23°F | 51°F 1953 | -3°F 1974 | 37% |
| Jan 10 | 32°F | 23°F | 50°F 2006 | -9°F 1949 | 37% |
| Jan 11 | 32°F | 23°F | 49°F 2014 | -2°F 1937 | 37% |
| Jan 12 | 32°F | 23°F | 49°F 1936 | -6°F 2024 | 37% |
| Jan 13 | 32°F | 23°F | 53°F 2014 | -9°F 2024 | 37% |
| Jan 14 | 32°F | 23°F | 52°F 1999 | -10°F 1950 | 37% |
| Jan 15 | 32°F | 23°F | 50°F 1961 | -11°F 1950 | 37% |
| Jan 16 | 32°F | 23°F | 51°F 1999 | -8°F 1950 | 36% |
| Jan 17 | 33°F | 23°F | 50°F 1976 | -12°F 1950 | 36% |
| Jan 18 | 33°F | 23°F | 51°F 1989 | -16°F 1950 | 36% |
| Jan 19 | 33°F | 24°F | 48°F 1968 | -7°F 1962 | 36% |
| Jan 20 | 33°F | 24°F | 48°F 1968 | -10°F 1935 | 36% |
| Jan 21 | 33°F | 24°F | 48°F 1972 | -3°F 1937 | 36% |
| Jan 22 | 33°F | 24°F | 47°F 1938 | -14°F 1943 | 35% |
| Jan 23 | 33°F | 24°F | 48°F 1970 | -10°F 1969 | 35% |
| Jan 24 | 34°F | 24°F | 50°F 1935 | -12°F 1957 | 35% |
| Jan 25 | 34°F | 24°F | 52°F 1935 | -13°F 1950 | 35% |
| Jan 26 | 34°F | 24°F | 53°F 2003 | -15°F 1957 | 34% |
| Jan 27 | 34°F | 24°F | 50°F 1983 | -11°F 1957 | 34% |
| Jan 28 | 34°F | 24°F | 51°F 1992 | -10°F 1969 | 34% |
| Jan 29 | 35°F | 24°F | 53°F 1967 | -12°F 1950 | 34% |
| Jan 30 | 35°F | 24°F | 55°F 1971 | -17°F 1950 | 34% |
| Jan 31 | 35°F | 24°F | 57°F 1971 | -13°F 1937 | 33% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:46 AM, sunset 4:14 PM
- January 31
- sunrise 7:25 AM, sunset 4:55 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00451767 (Coulee Dam 1 Sw), public domain. Records: NOAA GHCN-Daily, station USC00451767, 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.