Decatur (TX) Temperature by Month

Decatur in Texas, United States of America sees significant seasonal temperature differences, with daytime highs between 13°C (55°F) in January and 35°C (95°F) in August, averaging 24°C (75°F) annually. Explore the full monthly breakdown below.

Depending on the time of the year, temperatures range from very hot to mild in Decatur. Nighttime lows follow the same pattern, ranging from 23°C (73°F) to 0°C (32°F).

The chart below illustrates the average maximum day and minimum night temperatures in Decatur by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 310 hours of sunshine.

The chart below shows the average temperature throughout the year:

Decatur's average annual maximum temperature is 24°C (75°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.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Decatur's weather, including monthly rainfall, sunshine hours, and humidity, visit our Decatur climate page.