McDonough (GA) Temperature by Month

The average annual maximum temperature in McDonough, Georgia, United States of America is 23°C (73°F), with daytime highs ranging from 12°C (54°F) in January to 33°C (91°F) in July. This page covers monthly averages, day-night differences, and how McDonough compares to cities worldwide.

The weather in McDonough experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 21°C (70°F) in July to 0°C (32°F) in January.

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

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. July, the city's warmest month, averages 273 hours of sunshine.

The chart below shows the average temperature throughout the year:

McDonough's average annual maximum temperature is 23°C (73°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.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 McDonough, January is the coolest month, with average highs of 12°C (54°F) and humidity around 67%, considered high. In July, the warmest month, temperatures average 33°C (91°F) with 74% 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on McDonough's weather, including monthly rainfall, sunshine hours, and humidity, visit our McDonough climate page.