Ada County Weather in January
Average highs run from 37°F on January 1 to 41°F on January 31, and lows from 24°F to 27°F. Normal precipitation for the month is 1.41 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
- 39°F
- Average low
- 26°F
- Precipitation
- 1.41 in
- Snowfall
- 5.3 in
- Record high
- 66°FJan 31, 2024
- Record low
- -17°FJan 31, 1950
- Chance of a freeze
- 100%
- Daylight
- 9 h 02 min to 9 h 54 min
- Cloud cover
- 64%
- Humidity
- 81%
- Dew point
- 24°F
- Wind
- 7.2 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 |
|---|---|---|---|---|---|---|
| Jan 1 | 37°F | 24°F | 60°F 1997 | -13°F 1942 | 38% | 19% |
| Jan 2 | 37°F | 24°F | 55°F 2009 | -5°F 1975 | 38% | 19% |
| Jan 3 | 37°F | 25°F | 59°F 2026 | -5°F 1991 | 37% | 19% |
| Jan 4 | 38°F | 25°F | 57°F 1956 | -9°F 1991 | 37% | 19% |
| Jan 5 | 38°F | 25°F | 52°F 1954 | -12°F 1991 | 37% | 19% |
| Jan 6 | 38°F | 25°F | 55°F 1948 | -11°F 2017 | 37% | 19% |
| Jan 7 | 38°F | 25°F | 58°F 1948 | -10°F 1979 | 37% | 18% |
| Jan 8 | 38°F | 25°F | 55°F 1953 | -14°F 1977 | 37% | 18% |
| Jan 9 | 38°F | 25°F | 63°F 1953 | -13°F 1977 | 37% | 18% |
| Jan 10 | 38°F | 25°F | 57°F 1995 | -8°F 1977 | 37% | 18% |
| Jan 11 | 38°F | 25°F | 58°F 1959 | -6°F 1949 | 37% | 18% |
| Jan 12 | 38°F | 25°F | 59°F 1953 | -7°F 1963 | 37% | 18% |
| Jan 13 | 38°F | 25°F | 55°F 1969 | -1°F 1949 | 37% | 17% |
| Jan 14 | 38°F | 25°F | 56°F 1978 | -2°F 1947 | 37% | 17% |
| Jan 15 | 38°F | 25°F | 56°F 1951 | -10°F 1947 | 36% | 17% |
| Jan 16 | 39°F | 25°F | 57°F 2000 | -1°F 2017 | 36% | 17% |
| Jan 17 | 39°F | 26°F | 56°F 1951 | -7°F 1984 | 36% | 16% |
| Jan 18 | 39°F | 26°F | 58°F 2018 | -13°F 1984 | 36% | 16% |
| Jan 19 | 39°F | 26°F | 54°F 1971 | -10°F 1984 | 36% | 16% |
| Jan 20 | 39°F | 26°F | 57°F 1953 | -8°F 1984 | 36% | 16% |
| Jan 21 | 39°F | 26°F | 53°F 1943 | -12°F 1962 | 36% | 15% |
| Jan 22 | 39°F | 26°F | 53°F 1954 | -11°F 1962 | 35% | 15% |
| Jan 23 | 40°F | 26°F | 57°F 1953 | -12°F 1962 | 35% | 15% |
| Jan 24 | 40°F | 26°F | 57°F 1959 | -6°F 1949 | 35% | 15% |
| Jan 25 | 40°F | 26°F | 59°F 1953 | -5°F 1949 | 35% | 15% |
| Jan 26 | 40°F | 26°F | 55°F 1971 | -8°F 1957 | 35% | 14% |
| Jan 27 | 40°F | 27°F | 52°F 1940 | -9°F 1957 | 35% | 14% |
| Jan 28 | 41°F | 27°F | 56°F 1954 | -6°F 1957 | 34% | 14% |
| Jan 29 | 41°F | 27°F | 58°F 2024 | -9°F 1957 | 34% | 14% |
| Jan 30 | 41°F | 27°F | 61°F 2024 | -13°F 1979 | 34% | 14% |
| Jan 31 | 41°F | 27°F | 66°F 2024 | -17°F 1950 | 34% | 13% |
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 5:20 PM
- January 31
- sunrise 8:02 AM, sunset 5:56 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024131 (Boise Air Terminal), 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.