Joliet weather in January: Joliet, Illinois: normal highs, lows, rain and records for January
Joliet in January has a normal high of 31°F and a normal low of 17°F, a daily mean of 24°F, holding near 31°F all month. Measurable precipitation falls on 11 days in a normal January, 1.99 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 0°C and low of −9°C, 51 mm of precipitation and 13 cm of snow in January.
- NOAA stationJoliet Brandon Rd Dam
- Station IDUSC00114530
- Location41.50°N 88.10°W
- Elevation543 ft (166 m)
- Population151,837
- Jan 31° 17°
- Feb 35° 20°
- Mar 47° 29°
- Apr 60° 39°
- May 71° 49°
- Jun 80° 60°
- Jul 84° 64°
- Aug 82° 63°
- Sep 76° 55°
- Oct 63° 43°
- Nov 49° 32°
- Dec 36° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Joliet in January?
The normal high is 31°F and the normal low 17°F, for a daily mean of 23.9°F. January is 5.5°F cooler than December and 3.7°F cooler than February. January is the 12th warmest month of the year in Joliet and the 10th wettest. From one year to the next January's mean temperature typically moves about 4.9°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 19°F and 29°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 32°F | 19°F | 35% | 16% |
| January 8 | 31°F | 17°F | 36% | 16% |
| January 15 | 31°F | 16°F | 36% | 15% |
| January 22 | 31°F | 16°F | 36% | 15% |
| January 31 | 32°F | 16°F | 35% | 15% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 1, coldest night January 21)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 32°F | 19°F | 35% | 16% | 9 h 10 min |
| January 2 | 32°F | 18°F | 35% | 16% | 9 h 10 min |
| January 3 | 32°F | 18°F | 35% | 16% | 9 h 10 min |
| January 4 | 32°F | 18°F | 35% | 16% | 9 h 20 min |
| January 5 | 32°F | 18°F | 35% | 16% | 9 h 20 min |
| January 6 | 32°F | 18°F | 35% | 16% | 9 h 20 min |
| January 7 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 8 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 9 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 10 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 11 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 12 | 31°F | 17°F | 36% | 16% | 9 h 20 min |
| January 13 | 31°F | 17°F | 36% | 15% | 9 h 30 min |
| January 14 | 31°F | 16°F | 36% | 15% | 9 h 30 min |
| January 15 | 31°F | 16°F | 36% | 15% | 9 h 30 min |
| January 16 | 31°F | 16°F | 36% | 15% | 9 h 30 min |
| January 17 | 31°F | 16°F | 36% | 15% | 9 h 30 min |
| January 18 | 31°F | 16°F | 36% | 15% | 9 h 30 min |
| January 19 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 20 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 21 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 22 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 23 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 24 | 31°F | 16°F | 36% | 15% | 9 h 40 min |
| January 25 | 31°F | 16°F | 36% | 15% | 9 h 50 min |
| January 26 | 31°F | 16°F | 36% | 15% | 9 h 50 min |
| January 27 | 31°F | 16°F | 36% | 15% | 9 h 50 min |
| January 28 | 31°F | 16°F | 35% | 15% | 9 h 50 min |
| January 29 | 31°F | 16°F | 35% | 15% | 9 h 50 min |
| January 30 | 31°F | 16°F | 35% | 15% | 10 h |
| January 31 | 32°F | 16°F | 35% | 15% | 10 h |
- Normal high
- 31°FJanuary average
- Normal low
- 17°FJanuary average
- Precipitation
- 1.99 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 5.0 inmonth total
- Nights at 32°F or colder
- 28
- Daylight
- 9 h 10 min to 10 hJanuary 1 to January 31
- Sunshine
- 61%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00114530; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Joliet in January?
On a given January day the chance of 0.01 inch or more is 36% on average, highest around January 12 (36%). In all, 1.99 in falls on 11 days of a normal January.
In a normal January in Joliet, 28 nights fall to freezing, 16 days stay below freezing all day and snowfall averages 5.0 inches.
Snow falls on 4 days in a normal January, and an inch or more covers the ground on 12 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00114530.
What are the records for January in Joliet?
The warmest January temperature on this station's record (since 1975) is 65°F, on January 5, 1997; the coldest is −26°F, on January 21, 1985. The wettest January brought 3.89 in (1950); the snowiest, 16.2 inches (2012).
The January mean against the 1991-2020 normal of 23.9°F: 2021 27.3°F (+3.4), 2023 30.5°F (+6.6), 2024 25.4°F (+1.5), 2025 20.9°F (−3.0), 2026 21.8°F (−2.1). 3 of 5 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 27.3°F | +3.4°F | 2.17 in |
| 2023 | 30.5°F | +6.6°F | 2.86 in |
| 2024 | 25.4°F | +1.5°F | 3.07 in |
| 2025 | 20.9°F | −3.0°F | 0.60 in |
| 2026 | 21.8°F | −2.1°F | 3.18 in |
Source: records: ACIS, station USC00114530; recent months: ACIS, station USC00114530. Records and recent months use complete months only.
How does January in Joliet compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, January normal highs run from 27°F in Galena to 45°F in Anna; Joliet's is 31°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.