Sunshine Duration

Sunshine duration quantifies the cumulative seconds per hour that direct sunlight reaches the ground unobstructed by clouds, providing photographers with precise measurement of lighting consistency and cloud interference throughout the day. Unlike cloud cover percentage which shows sky obstruction at a moment, sunshine duration integrates time-varying cloudiness into a single actionable metric revealing whether photographers face continuous harsh sun, intermittent cloud breaks, or persistent overcast.

Maximum sunshine duration of 3600 seconds means an entire hour of unobstructed direct sunlight, creating harsh shadows, high contrast, and challenging midday conditions requiring careful exposure management and subject selection favoring bold graphical elements that embrace strong shadows. Moderate sunshine duration of 2400-3000 seconds (70-85% sun) indicates mostly clear conditions with occasional cloud passages that briefly soften light, ideal for general landscape photography where dominant sun provides good lighting but intermittent clouds prevent overly harsh conditions. Balanced sunshine duration of 1200-2400 seconds (35-65% sun) reveals dynamic partly-cloudy conditions where periods of direct sun alternate with cloud cover, producing the most dramatic and varied lighting as sun breaks illuminate landscapes intermittently against darker cloudy backgrounds.

Low sunshine duration under 900 seconds indicates predominantly overcast conditions where brief sun breaks occur infrequently, creating challenges for photographers seeking golden light but opportunities for those embracing soft even illumination. Zero sunshine duration represents complete overcast where no direct sun penetrates cloud layers. Sunshine duration patterns throughout the day tell planning stories: morning hours showing 0 seconds transitioning to 3600 seconds by midday forecast clearing marine layer perfect for timing beach shoots, while afternoon decrease from 3600 to 600 seconds warns of building clouds that may enhance or eliminate sunset light. PhotoWeather tracks sunshine duration forecasts to predict lighting consistency for shoots requiring stable conditions, identify cloud break opportunities during predominantly cloudy periods, and warn of harsh unrelenting sun requiring diffusion or strategic timing. Understanding sunshine duration evolution helps photographers distinguish between stable clear days, transitional clearing patterns, and variable partly-cloudy conditions. For consistent lighting requiring stable sun, target sunshine duration above 3000 seconds. For dramatic intermittent lighting and cloud breaks, seek 1200-2400 seconds. For soft diffused light without harsh shadows, embrace duration below 600 seconds indicating predominant overcast.