Barstow (CA) Temperature by Month
Barstow in California, United States of America sees significant seasonal temperature differences, with daytime highs between 14°C (57°F) in December and 39°C (102°F) in July, averaging 27°C (81°F) annually. Explore the full monthly breakdown below.
Barstow Monthly Temperatures
Depending on the time of the year, temperatures range from very hot to mild in Barstow. At night, minimum temperatures range from 22°C (72°F) in July to 1°C (34°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Barstow by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating.
The chart below shows the average temperature throughout the year:
Temperature: Barstow 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
warm
pleasant
moderate
cold
very cold
Barstow vs World: Temperature Compared
Barstow's average annual maximum temperature is 27°C (81°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
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.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Barstow this rarely lasts long on the ground.
For more on Barstow's weather — including monthly rainfall, sunshine hours, and humidity — visit our Barstow climate page.
