Fairfield (CT) Temperature by Month
The average annual maximum temperature in Fairfield, Connecticut, United States of America is 16°C (61°F), with daytime highs ranging from 4°C (39°F) in February to 29°C (84°F) in July. This page covers monthly averages, day-night differences, and how Fairfield compares to cities worldwide.
Fairfield Monthly Temperatures
The climate in Fairfield is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 20°C (68°F) in July to -5°C (23°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Fairfield by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 271 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Fairfield 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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Fairfield vs World: Temperature Compared
Fairfield's average annual maximum temperature is 16°C (61°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Fairfield?
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 Fairfield, February is the coolest month, with average highs of 4°C (39°F) and humidity around 59% — considered moderate. In July, the warmest month, temperatures average 29°C (84°F) with 64% 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 Fairfield this rarely lasts long on the ground.
For more on Fairfield's weather — including monthly rainfall, sunshine hours, and humidity — visit our Fairfield climate page.
