Boise County Weather in January
Average highs run from 34°F on January 1 to 37°F on January 31, and lows from 13°F to 15°F. Normal precipitation for the month is 3.16 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
- 35°F
- Average low
- 14°F
- Precipitation
- 3.16 in
- Snowfall
- 28.6 in
- Record high
- 66°FJan 31, 2024
- Record low
- -17°FJan 31, 1950
- Chance of a freeze
- 100%
- Daylight
- 8 h 58 min to 9 h 51 min
- Cloud cover
- 65%
- Humidity
- 93%
- Dew point
- 18°F
- Wind
- 4.3 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 |
|---|---|---|---|---|---|---|
| Jan 1 | 34°F | 13°F | 60°F 1997 | -13°F 1942 | 36% | 34% |
| Jan 2 | 34°F | 13°F | 55°F 2009 | -5°F 1975 | 36% | 34% |
| Jan 3 | 34°F | 13°F | 59°F 2026 | -5°F 1991 | 36% | 34% |
| Jan 4 | 34°F | 13°F | 57°F 1956 | -9°F 1991 | 36% | 34% |
| Jan 5 | 34°F | 13°F | 52°F 1954 | -12°F 1991 | 36% | 34% |
| Jan 6 | 34°F | 13°F | 55°F 1948 | -11°F 2017 | 35% | 34% |
| Jan 7 | 34°F | 13°F | 58°F 1948 | -10°F 1979 | 35% | 34% |
| Jan 8 | 34°F | 13°F | 55°F 1953 | -14°F 1977 | 35% | 33% |
| Jan 9 | 34°F | 13°F | 63°F 1953 | -13°F 1977 | 35% | 33% |
| Jan 10 | 35°F | 13°F | 57°F 1995 | -8°F 1977 | 35% | 33% |
| Jan 11 | 35°F | 13°F | 58°F 1959 | -6°F 1949 | 35% | 33% |
| Jan 12 | 35°F | 13°F | 59°F 1953 | -7°F 1963 | 35% | 33% |
| Jan 13 | 35°F | 13°F | 55°F 1969 | -1°F 1949 | 35% | 32% |
| Jan 14 | 35°F | 13°F | 56°F 1978 | -2°F 1947 | 35% | 32% |
| Jan 15 | 35°F | 13°F | 56°F 1951 | -10°F 1947 | 34% | 32% |
| Jan 16 | 35°F | 14°F | 57°F 2000 | -1°F 2017 | 34% | 32% |
| Jan 17 | 35°F | 14°F | 56°F 1951 | -7°F 1984 | 34% | 32% |
| Jan 18 | 35°F | 14°F | 58°F 2018 | -13°F 1984 | 34% | 31% |
| Jan 19 | 36°F | 14°F | 54°F 1971 | -10°F 1984 | 34% | 31% |
| Jan 20 | 36°F | 14°F | 57°F 1953 | -8°F 1984 | 34% | 31% |
| Jan 21 | 36°F | 14°F | 53°F 1943 | -12°F 1962 | 34% | 31% |
| Jan 22 | 36°F | 14°F | 53°F 1954 | -11°F 1962 | 34% | 30% |
| Jan 23 | 36°F | 14°F | 57°F 1953 | -12°F 1962 | 33% | 30% |
| Jan 24 | 36°F | 14°F | 57°F 1959 | -6°F 1949 | 33% | 30% |
| Jan 25 | 36°F | 14°F | 59°F 1953 | -5°F 1949 | 33% | 30% |
| Jan 26 | 37°F | 14°F | 55°F 1971 | -8°F 1957 | 33% | 29% |
| Jan 27 | 37°F | 14°F | 52°F 1940 | -9°F 1957 | 32% | 29% |
| Jan 28 | 37°F | 14°F | 56°F 1954 | -6°F 1957 | 32% | 29% |
| Jan 29 | 37°F | 14°F | 58°F 2024 | -9°F 1957 | 32% | 29% |
| Jan 30 | 37°F | 14°F | 61°F 2024 | -13°F 1979 | 32% | 28% |
| Jan 31 | 37°F | 15°F | 66°F 2024 | -17°F 1950 | 32% | 28% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- January 1
- sunrise 8:18 AM, sunset 5:16 PM
- January 31
- sunrise 8:01 AM, sunset 5:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00104442 (Idaho City), public domain. Records: NOAA GHCN-Daily, station USW00024131, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.