Sioux City weather in January: Sioux City, Iowa: normal highs, lows, rain and records for January
Sioux City in January has a normal high of 30°F and a normal low of 10°F, a daily mean of 20°F, holding near 30°F all month. Measurable precipitation falls on 7 days in a normal January, 0.69 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of −1°C and low of −12°C, 18 mm of precipitation and 20 cm of snow in January.
- NOAA stationSioux City Airport
- Station IDUSW00014943
- Location42.39°N 96.38°W
- Elevation1,095 ft (334 m)
- From the center7 miles
- Population86,875
- Jan 30° 10°
- Feb 34° 15°
- Mar 48° 26°
- Apr 61° 37°
- May 72° 49°
- Jun 82° 59°
- Jul 85° 63°
- Aug 83° 61°
- Sep 77° 51°
- Oct 63° 38°
- Nov 47° 25°
- Dec 33° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sioux City in January?
The normal high is 30°F and the normal low 10°F, for a daily mean of 20.0°F. January is 4.1°F cooler than December and 4.5°F cooler than February. January is the 12th warmest month of the year in Sioux City and the 12th wettest. Across the month the normal high rises 1°F, from 30°F on January 1 to 31°F on January 31. From one year to the next January's mean temperature typically moves about 5.1°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 15°F and 25°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 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 30°F | 11°F | 22% | 8% |
| January 8 | 29°F | 11°F | 22% | 7% |
| January 15 | 29°F | 10°F | 22% | 7% |
| January 22 | 30°F | 10°F | 22% | 7% |
| January 31 | 31°F | 11°F | 22% | 7% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 31, coldest night January 15)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 30°F | 11°F | 22% | 8% | 9 h 10 min |
| January 2 | 29°F | 11°F | 22% | 8% | 9 h 10 min |
| January 3 | 29°F | 11°F | 22% | 8% | 9 h 10 min |
| January 4 | 29°F | 11°F | 22% | 7% | 9 h 10 min |
| January 5 | 29°F | 11°F | 22% | 7% | 9 h 10 min |
| January 6 | 29°F | 11°F | 22% | 7% | 9 h 10 min |
| January 7 | 29°F | 11°F | 22% | 7% | 9 h 10 min |
| January 8 | 29°F | 11°F | 22% | 7% | 9 h 10 min |
| January 9 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 10 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 11 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 12 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 13 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 14 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 15 | 29°F | 10°F | 22% | 7% | 9 h 20 min |
| January 16 | 29°F | 10°F | 22% | 7% | 9 h 30 min |
| January 17 | 29°F | 10°F | 22% | 7% | 9 h 30 min |
| January 18 | 29°F | 10°F | 22% | 7% | 9 h 30 min |
| January 19 | 29°F | 10°F | 22% | 7% | 9 h 30 min |
| January 20 | 30°F | 10°F | 22% | 7% | 9 h 30 min |
| January 21 | 30°F | 10°F | 22% | 7% | 9 h 30 min |
| January 22 | 30°F | 10°F | 22% | 7% | 9 h 40 min |
| January 23 | 30°F | 10°F | 22% | 7% | 9 h 40 min |
| January 24 | 30°F | 10°F | 22% | 7% | 9 h 40 min |
| January 25 | 30°F | 10°F | 22% | 7% | 9 h 40 min |
| January 26 | 30°F | 10°F | 22% | 7% | 9 h 40 min |
| January 27 | 30°F | 10°F | 22% | 7% | 9 h 50 min |
| January 28 | 30°F | 11°F | 22% | 7% | 9 h 50 min |
| January 29 | 30°F | 11°F | 22% | 7% | 9 h 50 min |
| January 30 | 31°F | 11°F | 22% | 7% | 9 h 50 min |
| January 31 | 31°F | 11°F | 22% | 7% | 10 h |
- Normal high
- 30°FJanuary average
- Normal low
- 10°FJanuary average
- Precipitation
- 0.69 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 7.7 inmonth total
- Nights at 32°F or colder
- 31
- Daylight
- 9 h 10 min to 10 hJanuary 1 to January 31
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014943; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Sioux City in January?
On a given January day the chance of 0.01 inch or more is 22% on average, highest around January 30 (22%). In all, 0.69 in falls on 7 days of a normal January.
In a normal January in Sioux City, 31 nights fall to freezing, 17 days stay below freezing all day and snowfall averages 7.7 inches.
Snow falls on 6 days in a normal January, and an inch or more covers the ground on 20 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014943.
How humid and windy is Sioux City in January?
At 3 p.m. the normal temperature is 29°F with 64% relative humidity and a dew point of 19°F; at 6 a.m. it is 18°F with 81% humidity. The wind averages 10.6 mph, most often from the northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 18°F | 13°F | 81% | 9.9 mph | 48% |
| 9 a.m. | 19°F | 14°F | 80% | 10.3 mph | 53% |
| noon | 26°F | 17°F | 69% | 12.1 mph | 51% |
| 3 p.m. | 29°F | 19°F | 64% | 12.5 mph | 55% |
| 6 p.m. | 26°F | 18°F | 72% | 10.3 mph | 50% |
| 9 p.m. | 22°F | 16°F | 77% | 9.8 mph | 59% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014943. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for January in Sioux City?
The warmest January temperature on Sioux City's official record (since 1889) is 71°F, on January 26, 2002; the coldest is −35°F, on January 12, 1912. The wettest January brought 2.44 in (1949); the snowiest, 29.1 inches (1982).
The January mean against the 1991-2020 normal of 20.0°F: 2021 26.4°F (+6.4), 2022 21.6°F (+1.6), 2023 21.4°F (+1.4), 2024 18.3°F (−1.7), 2025 20.6°F (+0.6), 2026 21.4°F (+1.4). 5 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 26.4°F | +6.4°F | 1.30 in |
| 2022 | 21.6°F | +1.6°F | 0.16 in |
| 2023 | 21.4°F | +1.4°F | 1.46 in |
| 2024 | 18.3°F | −1.7°F | 1.73 in |
| 2025 | 20.6°F | +0.6°F | 0.18 in |
| 2026 | 21.4°F | +1.4°F | 0.28 in |
Source: records: ACIS, NWS threaded record SUXthr; recent months: ACIS, station USW00014943. Records and recent months use complete months only.
How does January in Sioux City compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, January normal highs run from 21°F in Northwood to 33°F in Shenandoah; Sioux City's is 30°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.