Climate Chart of Incheon, South Korea

Climate overview

Temperature

The monthly mean temperature is lowest in January, at -2.3 °C, and reaches its highest point in August, at 25.2 °C. These are averages for each month, not daytime highs or a promise that every day will match the monthly figure; visitors should allow for day-to-day variation when planning clothing and outdoor activities. Across the calendar-month means, the unweighted mean is 11.7 °C. It summarizes the monthly averages without weighting them by the number of days in each month, so it is best read alongside the monthly extremes rather than as a typical temperature for every day.

Rain

Mean daily rainfall is highest in July, at 8.69 mm/day. Visitors at this time should be prepared for rain, but the average amount does not tell you how often rain falls or whether a particular day will be wet. The lowest monthly mean daily rainfall occurs in January, at 0.45 mm/day, making it a conditional option for travelers prioritizing lower average rainfall. The unweighted mean across monthly rainfall averages is 2.97 mm/day; neither this nor the low-month figure guarantees dry days, and these are daily means rather than monthly totals.

Sunshine

Mean daily sunshine duration peaks in May at 10.11 hours/day, while the lowest monthly mean is in December at 6.91 hours/day. These averages can help with planning daylight outdoor time, but sunshine duration is not the same as day length and does not guarantee clear weather on a given day. The unweighted mean across the monthly sunshine averages is 8.45 hours/day. It provides a broad reference, rather than a daily forecast or a measure of how much usable daylight a particular itinerary will have.

Snow

Mean daily snowfall is highest in December, at 1.31 mm/day; the unweighted mean across monthly snowfall averages is 0.36 mm/day. These mean amounts record snowfall, but do not establish how many days snow falls, snow depth, lasting snow cover, or skiing conditions.