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The average temperature in Sŏsan over the whole year is 13°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -3°C. The rainy (wet) season in Sŏsan runs from April to November, peaking in August with a 65% chance of rain on a given day. The dry season is December to March; January is the driest month, at 38%. Winds in Sŏsan are highest in April, averaging 2.7 m/s (10 km/h), and lightest in November, at 2.1 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Sŏsan come in March, when the sky is typically 46% covered; July is the cloudiest month, at 63%.
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 2°C | -3°C | -2°C | 38% | 48% | 2.2 m/s | 0 | 0 | 5 |
| February | 4°C | -2°C | -0°C | 46% | 46% | 2.4 m/s | 0 | 0 | 12 |
| March | 11°C | 3°C | 6°C | 51% | 46% | 2.6 m/s | 6 | 0 | 47 |
| April | 16°C | 9°C | 12°C | 57% | 47% | 2.7 m/s | 33 | 1 | 73 |
| May | 21°C | 14°C | 19°C | 61% | 52% | 2.5 m/s | 71 | 12 | 67 |
| June | 25°C | 19°C | 25°C | 53% | 57% | 2.3 m/s | 63 | 50 | 27 |
| July | 28°C | 24°C | 31°C | 61% | 63% | 2.3 m/s | 21 | 47 | 5 |
| August | 29°C | 24°C | 32°C | 65% | 59% | 2.2 m/s | 13 | 37 | 4 |
| September | 25°C | 19°C | 25°C | 61% | 55% | 2.3 m/s | 57 | 46 | 28 |
| October | 18°C | 12°C | 16°C | 58% | 53% | 2.3 m/s | 56 | 4 | 74 |
| November | 12°C | 6°C | 9°C | 52% | 46% | 2.1 m/s | 20 | 0 | 56 |
| December | 4°C | -1°C | -0°C | 41% | 51% | 2.2 m/s | 0 | 0 | 13 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Year round, Sŏsan has days of about 2°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from -3°C to 24°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around August and least likely around January. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Winter in Sŏsan has typical daily highs of about 3°C and lows of about -2°C, with a 42% chance of rain on a given day.
Spring in Sŏsan has typical daily highs of about 16°C and lows of about 9°C, with a 56% chance of rain on a given day.
Summer in Sŏsan has typical daily highs of about 27°C and lows of about 22°C, with a 60% chance of rain on a given day.
Autumn in Sŏsan has typical daily highs of about 18°C and lows of about 12°C, with a 57% chance of rain on a given day.
The rainy (wet) season in Sŏsan runs from April to November, peaking in August with a 65% chance of rain on a given day. The dry season is December to March; January is the driest month, at 38%.
Winds in Sŏsan are highest in April, averaging 2.7 m/s (10 km/h), and lightest in November, at 2.1 m/s (8 km/h). The prevailing wind is from the W.
The average temperature in Sŏsan over the whole year is 13°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -3°C.