Sioux City Weather Records

Sioux City, Iowa weather averages and records from 1948–2024 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Sioux City, Iowa was 108 °F which occurred on July 12, 1995.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Sioux City, Iowa was -28 °F which occurred on February 16, 2021.
Lowest Temperatures: All-Time By Year
Sioux City Weather by Month
Averages based on the years 1991–2020
Month Average (°F) Record (°F) Average (inches)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January 30.0 10.7 71 -28 0.7 7.7
February 34.8 15.0 77 -28 0.9 8.7
March 48.3 26.1 91 -22 1.8 5.7
April 61.7 36.9 97 -2 3.1 2.3
May 72.9 49.1 106 25 3.9 0.0
June 82.6 59.8 108 39 4.3 0.0
July 85.7 63.7 108 42 3.4 0.0
August 83.3 61.1 104 37 3.9 0.0
September 77.2 51.4 103 25 2.8 0.0
October 63.4 38.2 94 8 2.2 0.8
November 47.4 25.2 82 -9 1.3 3.2
December 34.0 15.1 70 -24 1.0 7.6
Entire year 60.2 37.8 108 -28 29.2 36.0
More Sioux City Weather Records
1948–2024
Highest daily low 80 °F August 23, 2023
Lowest daily high -13 °F December 21, 1989
Greatest daily range
(Difference of high and low)
61 °F April 2, 1982
Greatest difference in daily high
over two conscutive days
52 °F Dec 28–29, 2013
Most daily precipitation 5.5 inches July 17, 1972
Most monthly precipitation 16.7 inches June 2014
Most yearly precipitation 41.4 inches 2014
Most yearly days with precipitation 127 1984
Earliest snow in season September 30 1961
Latest snow in season May 1 2013
Most daily snow 18.4 inches March 15, 2004
Most monthly snow 34.0 inches December 2009
Most yearly snow 64.7 inches 1983
Most snow in a winter 65.9 inches 1961–1962
Greatest snow accumulation 28.0 inches January 10, 2010
Earliest freeze September 19 1991
Earliest day ≥ 80 °F March 6 2017
Earliest day ≥ 90 °F March 16 2015
Earliest day ≥ 100 °F May 14 2013
Latest freeze May 22 2022
Latest day ≥ 80 °F November 8 2006
Latest day ≥ 90 °F October 15 1958
Latest day ≥ 100 °F September 7 1971
Most days in a year < 0 °F 44 1978
Most days in a year < 32 °F 169 1996
Most days in a year ≥ 80 °F 127 2012
Most days in a year ≥ 90 °F 56 2012
Most days in a year ≥ 100 °F 11 1988
Sioux City Weather Streaks
Most consecutive days...
With precipitation 9 days May 20–28, 1996
Without precipitation 56 days Sep 22 – Nov 16, 1952
With snow 9 days Mar 8–16, 1960
High temperature at or
below freezing
52 days Dec 29, 1978 – Feb 18, 1979
High temperature ≥ 80 °F 62 days Jun 29 – Aug 29, 1955
High temperature ≥ 90 °F 16 days Jul 4–19, 1980
High temperature ≥ 100 °F 5 days Jul 17–21, 1974
Plant Hardiness Zone
5A
Sioux City is in plant hardiness zone 5A
based on average yearly minimum temperature from 1991–2020
Facts About Sioux City Weather
Sioux City Weather by Year
More Sioux City Weather
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Weather Station Details
Years Station Coordinates
1948–2024 Sioux City Gateway Airport location