Sunshine & Daylight Hours in Vientiane, Laos
- Mean hours of sunlight in Vientiane range from 4h 00' each day in June to 8h 12' to each day in December.
- The longest day of the year is 13h 04' long and the shortest day is 10h 55' long.
- The longest day is 2h 09' longer than the shortest day.
- There is an average of 2420 hours of sunlight per year (of a possible 4383) with an average of 6:37 of sunlight per day.
- It is sunny 55.2% of daylight hours. The remaining 44.8% of daylight hours are likely cloudy or with shade, haze or low sun intensity.
- At midday the sun is on average 70.7° above the horizon at Vientiane.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average Sunlight Hours/ Day | 7h 42' | 7h 19' | 6h 54' | 7h 18' | 6h 17' | 4h 00' | 5h 05' | 4h 48' | 5h 48' | 7h 54' | 8h 12' | 8h 11' | 6h 37' | ||
| Average Daylight Hours & Minutes/ Day | 11h 10' | 11h 31' | 12h 00' | 12h 31' | 12h 57' | 13h 10' | 13h 04' | 12h 42' | 12h 12' | 11h 41' | 11h 15' | 11h 03' | 12h 00' | ||
| Percentage of Sunny (Cloudy) Daylight Hours | 70 (30) | 64 (36) | 58 (42) | 59 (41) | 49 (51) | 31 (69) | 39 (61) | 38 (62) | 48 (52) | 68 (32) | 74 (26) | 75 (25) | 55 (45) | ||
| Sun altitude at solar noon on the 21st day (°). | 52 | 61.3 | 72.2 | 83.9 | 87.6 | 84.5 | 87.1 | 84.1 | 72.7 | 61.1 | 52 | 48.6 | 70.7 |