Sunshine hours in Seoul: 2,144 hours a year, month by month

Seoul gets 2,144 hours of sunshine a year on average (5.9 a day). Sunniest month: May with 223 hours. Every month, measured 1991–2020.

• Seoul gets 2,144 hours of sunshine a year on average, 5.9 a day – 48% of the astronomically possible. The sunniest month is May with 223 hours (7.2 a day), the dullest July with 124 (4.0 a day).
• Number 39 of 57 large cities in South Korea.
• Weather station: Seoul – 1991–2020 average, Deutscher Wetterdienst.

Sunshine hours month by month

• January: 170 h · 5.5 h a day · 55 %
• February: 171 h · 6.1 h a day · 57 %
• March: 198 h · 6.4 h a day · 53 %
• April: 206 h · 6.9 h a day · 52 %
• May: 223 h · 7.2 h a day · 51 %
• June: 189 h · 6.3 h a day · 43 %
• July: 124 h · 4.0 h a day · 28 %
• August: 156 h · 5.0 h a day · 37 %
• September: 180 h · 6.0 h a day · 48 %
• October: 207 h · 6.7 h a day · 59 %
• November: 157 h · 5.2 h a day · 51 %
• December: 163 h · 5.3 h a day · 55 %

Questions about sunshine hours

• How many hours of sunshine does Seoul get a year? On average over 1991–2020 the sun shines in Seoul for 2,144 hours a year – 5.9 hours a day and 48% of the time the sun is above the horizon.
• What is the sunniest month in Seoul? May, with 223 hours of sunshine, 7.2 a day on average. The least sun comes in July: 124 hours, 4.0 a day.
• Is Seoul a sunny city? Among the 57 large cities in South Korea with measurements, Seoul ranks number 39.
• Where do the figures come from? From the 1991–2020 climate normals of Deutscher Wetterdienst: Germany from its own station network, the rest of the world from the CLIMAT reports of the national weather services. Seoul uses the station Seoul.
• What counts as an hour of sunshine? By the World Meteorological Organization's definition the sun is shining once its direct radiation exceeds 120 watts per square metre. Just after sunrise and before sunset it is often too weak – which is why even deserts never reach 100%.

The sunniest large cities: United States

• 1. Phoenix: 3,873 h a year
• 2. Las Vegas: 3,826 h a year
• 3. Tucson: 3,806 h a year
• 4. Reno: 3,647 h a year
• 5. Sacramento: 3,609 h a year
• 6. Fresno: 3,565 h a year
• 7. Chico: 3,542 h a year
• 8. Colorado Springs: 3,463 h a year
• 9. Albuquerque: 3,414 h a year
• 10. Amarillo: 3,298 h a year

The cloudiest large cities: United States

• 1. Pittsburgh: 1,972 h a year
• 2. Anchorage: 2,063 h a year
• 3. Syracuse: 2,120 h a year
• 4. Seattle: 2,170 h a year
• 5. Columbus: 2,182 h a year
• 6. Grand Rapids: 2,188 h a year
• 7. Buffalo: 2,206 h a year
• 8. Meads: 2,259 h a year
• 9. Cleveland: 2,281 h a year
• 10. Rochester: 2,299 h a year

The sunniest large cities in the world

• 1. Mexicali: 4,017 h a year
• 2. Phoenix: 3,873 h a year
• 3. Las Vegas: 3,826 h a year
• 4. Tucson: 3,806 h a year
• 5. Ciudad Juárez: 3,763 h a year
• 6. Reno: 3,647 h a year
• 7. Dubai: 3,610 h a year
• 8. Sacramento: 3,609 h a year
• 9. Victoria de Durango: 3,573 h a year
• 10. Fresno: 3,565 h a year

The cloudiest large cities in the world

• 1. Chengdu: 962 h a year
• 2. Chongqing: 985 h a year
• 3. Sukabumi: 1,082 h a year
• 4. Glasgow: 1,153 h a year
• 5. Tanjung Pinang: 1,172 h a year
• 6. Medan: 1,201 h a year
• 7. Samarinda: 1,275 h a year
• 8. Sungai Penuh: 1,311 h a year
• 9. Limerick: 1,339 h a year
• 10. Huaihua: 1,352 h a year

• Data: Deutscher Wetterdienst (DWD), sunshine duration climate normals 1991–2020, CC BY 4.0. Possible hours: time between sunrise and sunset.