Bay City (MI) Temperature by Month
The average annual maximum temperature in Bay City, Michigan, United States of America is 14°C (57°F), with daytime highs ranging from -1°C (30°F) in January to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Bay City compares to cities worldwide.
Bay City Monthly Temperatures
In Bay City, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 16°C (61°F) in July to -10°C (14°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Bay City by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak.
The chart below shows the average temperature throughout the year:
Temperature: Bay 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.
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Bay City vs World: Temperature Compared
Bay City's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
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 Bay City's weather — including monthly rainfall, sunshine hours, and humidity — visit our Bay City climate page.
