Mason City Weather Records

Mason City, Iowa weather averages and records from 1893–2024 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Mason City, Iowa was 107 °F which occurred on July 14, 1936.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Mason City, Iowa was -35 °F which occurred on February 10, 1899.
Lowest Temperatures: All-Time By Year
Mason 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 24.4 7.5 62 -34 0.9 11.1
February 28.8 11.7 66 -35 1.2 10.0
March 42.3 23.8 84 -28 2.3 7.0
April 57.8 34.8 93 6 4.1 3.0
May 69.8 47.0 104 22 5.1 0.3
June 79.9 57.6 104 31 5.4 0.0
July 82.8 60.7 107 38 4.4 0.0
August 80.4 57.8 103 30 3.7 0.0
September 74.3 49.1 103 15 3.4 0.0
October 60.1 36.8 95 -4 2.5 0.4
November 43.7 24.5 79 -16 1.7 3.0
December 29.9 13.8 69 -26 1.3 9.3
Entire year 56.3 35.5 107 -35 36.2 44.5
More Mason City Weather Records
1893–2024
Highest daily low 80 °F July 5, 1911
Lowest daily high -20 °F December 23, 1983
Greatest daily range
(Difference of high and low)
60 °F January 18, 1996
Greatest difference in daily high
over two conscutive days
50 °F Jan 18–19, 1996
Most daily precipitation 7.0 inches June 1, 1900
Most monthly precipitation 15.8 inches August 1980
Most yearly precipitation 50.0 inches 2018
Most yearly days with precipitation 141 1993
Earliest snow in season September 26 1942
Latest snow in season May 29 1947
Most daily snow 15.0 inches March 19, 1933
Most monthly snow 29.3 inches February 2019
Most yearly snow 69.4 inches 2018
Most snow in a winter 68.5 inches 1970–1971
Greatest snow accumulation 290.0 inches February 18, 1905
Earliest freeze August 30 1915
Earliest day ≥ 80 °F March 16 2012
Earliest day ≥ 90 °F April 10 1930
Earliest day ≥ 100 °F May 22 1925
Latest freeze June 2 1928
Latest day ≥ 80 °F October 31 1950
Latest day ≥ 90 °F October 21 1947
Latest day ≥ 100 °F September 6 1922
Most days in a year < 0 °F 51 1978
Most days in a year < 32 °F 178 1996
Most days in a year ≥ 80 °F 103 1939
Most days in a year ≥ 90 °F 48 1936
Most days in a year ≥ 100 °F 14 1936
Mason City Weather Streaks
Most consecutive days...
With precipitation 9 days May 23–31, 2016
Without precipitation 54 days Oct 16 – Dec 8, 1903
With snow 6 days Feb 22–27, 2019
High temperature at or
below freezing
66 days Dec 16, 1978 – Feb 19, 1979
High temperature ≥ 80 °F 58 days Jun 14 – Aug 10, 1893
High temperature ≥ 90 °F 17 days Jul 3–19, 1936
High temperature ≥ 100 °F 9 days Jul 9–17, 1936
Plant Hardiness Zone
5A
Mason City is in plant hardiness zone 5A
based on average yearly minimum temperature from 1991–2020
Mason City Weather by Year
More Mason City Weather
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Weather Station Details
Years Station Coordinates
1948–2024 Mason City Municipal Airport location
1893–1947 Mason City location