Sunshine hours in Heidelberg: 1,715 hours a year, month by month

Heidelberg gets 1,715 hours of sunshine a year on average (4.7 a day). Sunniest month: July with 240 hours. Every month, measured 1991–2020.

• Heidelberg gets 1,715 hours of sunshine a year on average, 4.7 a day – 38% of the astronomically possible. The sunniest month is July with 240 hours (7.7 a day), the dullest December with 38 (1.2 a day).
• Number 25 of 87 large cities in Germany.
• Weather station: Heidelberg – 1991–2020 average, Deutscher Wetterdienst.

Sunshine hours month by month

• January: 48 h · 1.5 h a day · 18 %
• February: 78 h · 2.8 h a day · 27 %
• March: 133 h · 4.3 h a day · 36 %
• April: 190 h · 6.3 h a day · 46 %
• May: 214 h · 6.9 h a day · 45 %
• June: 227 h · 7.6 h a day · 47 %
• July: 240 h · 7.7 h a day · 49 %
• August: 226 h · 7.3 h a day · 51 %
• September: 167 h · 5.6 h a day · 44 %
• October: 103 h · 3.3 h a day · 31 %
• November: 51 h · 1.7 h a day · 19 %
• December: 38 h · 1.2 h a day · 15 %

Questions about sunshine hours

• How many hours of sunshine does Heidelberg get a year? On average over 1991–2020 the sun shines in Heidelberg for 1,715 hours a year – 4.7 hours a day and 38% of the time the sun is above the horizon.
• What is the sunniest month in Heidelberg? July, with 240 hours of sunshine, 7.7 a day on average. The least sun comes in December: 38 hours, 1.2 a day.
• Is Heidelberg a sunny city? Among the 87 large cities in Germany with measurements, Heidelberg ranks number 25.
• 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. Heidelberg uses the station Heidelberg.
• 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.