Boulder City (NV) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore temperature statistics for Boulder City in Nevada, United States of America, 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 City, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures reach a very hot 40°C in July. In December, the coolest month of the year, temperatures drop to a mild 13°C. At night, expect even cooler temperatures, with lows averaging around 4°C.
The chart below illustrates the average maximum day and minimum night temperatures in Boulder City by month:
Typically, the coolest time of day is between 4 AM and 6 AM, while the hottest time occurs around 3 PM, when the sun’s heating effect is strongest. July, the city’s warmest month, experiences 383 hours of sunshine.
The chart below shows the average temperature throughout the year:
December, the city’s coldest month, sees about 17 mm of rainfall spread over roughly 4 days. It records 250 hours of sunshine of sunshine.
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.






Boulder City Temperatures Compared World Wide
Boulder City’s average annual maximum temperature is 27°C. Let’s compare this with some popular tourist destinations:
In Barcelona, Spain, the average annual temperature is around 21°C, resulting in warm summers and mild winters throughout the year.
In contrast, in Oslo, Norway, the average annual temperature is significantly lower at 10°C, with mild summers and cold winters.
Boston, USA, experiences seasonal shifts similar to New York, with an average annual temperature of 16°C.
Melbourne, Australia, has a slightly cooler climate, with an average annual temperature of 20°C.
How does the temperature feel?
Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.
In Boulder City, during the coolest month, December, you will experience 45% humidity, which is considered moderate. This is accompanied by an average maximum temperature of 13°C. In the warmest month, July, the humidity is 21% combined with an average maximum temperature of 40°C, which creates a low-feel temperature. Explore our detailed page on humidity levels for further details.
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.
Global Warming and Its Effects
Climate change is affecting worldwide temperatures, including in Boulder City. It has massive impacts on both local and global levels:
- Global Temperature Rise: The average global land and sea temperatures have risen by about 1.2°C since pre-industrial times.
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Local Impacts: Most regions of the world are witnessing warmer winters with fewer frost and snowfall days. The global frequency and severity of heatwaves have increased. For example, Europe's summers of 2018, 2019, and 2020 all broke records. Summers are also becoming drier; however, during winter, inland regions have experienced increased rainfall. This has caused elevated river levels and more cases of flooding.
Many countries are experiencing earlier springs and later autumns. This is why some bird species have shifted their migration dates.
For more detailed information about Boulder City’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Boulder City climate page.