Duncan (SC) Temperature by Month

Duncan in South Carolina, United States of America sees significant seasonal temperature differences, with daytime highs between 11°C (52°F) in January and 32°C (90°F) in July, averaging 22°C (72°F) annually. Explore the full monthly breakdown below.

Visitors to Duncan can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 21°C (70°F) in July to -1°C (30°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Duncan 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.

The chart below shows the average temperature throughout the year:

Duncan's average annual maximum temperature is 22°C (72°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.

On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.

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

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

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