Hazelwood (MO) Temperature by Month
Hazelwood, Missouri, United States of America has an average annual maximum temperature of 19°C (66°F), ranging from 5°C (41°F) in January to 32°C (90°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Hazelwood Monthly Temperatures
The climate in Hazelwood is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 22°C (72°F) in July to -5°C (23°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Hazelwood 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. July, the warmest month of the year, receives 311 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Hazelwood 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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Hazelwood vs World: Temperature Compared
Hazelwood's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Hazelwood?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Hazelwood, January is the coolest month, with average highs of 5°C (41°F) and humidity around 72% — considered high. In July, the warmest month, temperatures average 32°C (90°F) with 68% humidity — conditions that feel high. For a full picture, see our humidity page.
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 Hazelwood this rarely lasts long on the ground.
For more on Hazelwood's weather — including monthly rainfall, sunshine hours, and humidity — visit our Hazelwood climate page.
