Big Bear Lake (CA) Temperature by Month
Big Bear Lake in California, United States of America sees significant seasonal temperature differences, with daytime highs between 9°C (48°F) in December and 27°C (81°F) in July, averaging 17°C (63°F) annually. Explore the full monthly breakdown below.
Big Bear Lake Monthly Temperatures
The weather in Big Bear Lake experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 9°C (48°F) in July to -6°C (21°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Big Bear Lake 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:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Big Bear Lake Temperatures: 1976-2026
Browse day-by-day temperature records for Big Bear Lake spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Big Bear Lake 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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Big Bear Lake vs World: Temperature Compared
Big Bear Lake's average annual maximum temperature is 17°C (63°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.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
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 Big Bear Lake's weather — including monthly rainfall, sunshine hours, and humidity — visit our Big Bear Lake climate page.
