Seongnam, South Korea
Influenced heavily by the Siberian High in winter and the East Asian Monsoon in summer. Features four dramatically distinct seasons ranging from freezing, dry winter winds to hot, tropical, and heavily wet summer periods.
Extreme Winter Avg
Extreme Summer Avg
Silicon Valley
Covers Palo Alto, Mountain View, and Sunnyvale. Strongly moderated by the Pacific Ocean and SF Bay. Characterized by exceptional thermal stability, featuring comfortable, arid summers and mild, green winters.
Mild Winter Avg
Comfortable Summer Avg
Monthly Average Temperatures
Comparison of seasonal trajectory throughout the year
Direct Climate Metrics
Side-by-side core meteorological values
| Key Metric | Seongnam, South Korea | Silicon Valley (Sunnyvale, MV, Palo Alto) |
|---|---|---|
| Hottest Month |
August |
August / September |
| Coldest Month |
January |
December / January |
| Annual Precipitation |
~50.4 inches (1,281 mm) Heavily concentrated in summer |
~14.5 inches (368 mm) Heavily concentrated in winter |
| Precipitation Pattern |
Summer Monsoon (*Jangma*) July alone receives ~12.8 inches (324 mm) |
Winter Storm Tracks Dry summers (June–Sept average < 0.1 inches) |
| Snowfall |
Regular winter snowfall Precipitation falls as snow from Dec to Feb |
Extremely Rare / None Temps almost never dip to freezing at valley floor |
| Relative Humidity |
Highly Variable Uncomfortably high (80%+) in July/August |
Consistently Moderate Dry, comfortable summer afternoons (40%–50%) |
Seasonal Dynamics
How the weather changes quarter by quarter
Winter (Dec–Feb)
Seongnam
Freezing, crisp, and dry. Dominated by cold continental winds from Siberia. Frequent frost and light-to-moderate snow.
Silicon Valley
Cool, green, and periodically rainy. Mild daytime temperatures mean snow is non-existent on the valley floor.
Spring (Mar–May)
Seongnam
Rapid warming with cherry blossom season. Pleasant temperatures, but occasionally affected by desert dust winds.
Silicon Valley
Pleasant, sunny, and highly comfortable. Rains quickly transition into dry, sunny spring afternoons in the 70s.
Summer (Jun–Aug)
Seongnam
Hot, humid, and rainy. The monsoon brings persistent tropical downpours and high heat indices that make it feel muggy.
Silicon Valley
Warm, bone-dry, and sunny. Absolute absence of rain, with cooling marine layers keeping humidity exceptionally comfortable.
Autumn (Sep–Nov)
Seongnam
Crisp, clear sky conditions with brilliant fall colors. Cooling temperatures, dropping rapidly as November approaches.
Silicon Valley
Extended summer-like conditions through September and October. Gentle transitions with late-year rain beginning in late November.