Mason City (IA) Temperature by Month
The average annual maximum temperature in Mason City, Iowa, United States of America is 13°C (55°F), with daytime highs ranging from -5°C (23°F) in January to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Mason City compares to cities worldwide.
Mason City Monthly Temperatures
Depending on the time of the year, temperatures range from warm to very cold in Mason City. Nighttime lows follow the same pattern, ranging from 16°C (61°F) to -14°C (7°F).
The chart below illustrates the average maximum day and minimum night temperatures in Mason City by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 342 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Mason City vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
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moderate
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Mason City vs World: Temperature Compared
Mason City's average annual maximum temperature is 13°C (55°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Mason City's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mason City climate page.
