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.
Duncan Monthly Temperatures
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:
Temperature: Duncan 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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Duncan vs World: Temperature Compared
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.
