Boulder (CO) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore Boulder’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
In Boulder, temperatures can shift dramatically between very warm in summer and cold in winter. On average, maximum daytime temperatures range from a very warm 31°C in July to a chilly 7°C in December. Nighttime temperatures can drop, with averages reaching -7°C in December.
The chart below illustrates the average maximum day and minimum night temperatures in Boulder by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM. During this time the sun's heating effect is the strongest.
The chart below shows the average temperature throughout the year:
July, the city’s warmest month, also receives about 53 mm of rainfall spread over roughly 13 days. For more information, please visit our Boulder Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
Boulder Temperatures Compared World Wide
Boulder’s average annual maximum temperature is 18°C. Let’s compare this with some popular tourist destinations:
In Lisbon, Portugal, the average annual temperature is 21°C, offering warm summers and mild, rainy winters.
In contrast, in ReykjavÃk, Iceland, the average annual temperature is significantly lower at 9°C, with mild summers and cold winters.
The climate in San Francisco, USA, is mild, with an average annual temperature of 19°C and minimal seasonal variation.
In Tokyo, Japan, the average annual temperature is 21°C, expect warmer summers and milder winters than Amsterdam.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Effects of Temperature on Weather and Climate
Temperature variations influence precipitation patterns in Amsterdam:
Rainfall: Warm air holds more moisture, leading to heavier rain during warmer months. However, precipitation is generally moderate year-round.
Snow: Occasional snowfall occurs in winter, though it rarely lasts very long.
For more detailed information about Boulder’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Boulder climate page.
Current temperature in Boulder (CO)
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