Mount Shasta (CA) Temperature by Month
The average annual maximum temperature in Mount Shasta, California, United States of America is 18°C (64°F), with daytime highs ranging from 6°C (43°F) in December to 30°C (86°F) in July. This page covers monthly averages, day-night differences, and how Mount Shasta compares to cities worldwide.
Mount Shasta Monthly Temperatures
The weather in Mount Shasta experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 12°C (54°F) in July to -2°C (28°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Mount Shasta by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Mount Shasta 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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Mount Shasta vs World: Temperature Compared
Mount Shasta's average annual maximum temperature is 18°C (64°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.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
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.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Mount Shasta's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mount Shasta climate page.
