South Korea experiences a continental climate with four distinct seasons, positioned between 33°N and 38°N latitude on the Korean Peninsula's southern portion. The Yellow Sea moderates the western coast, the East Sea influences the eastern seaboard, and the Korea Strait affects southern coastal areas. Monsoon patterns dominate summer precipitation, while winter brings Siberian air masses that produce cold, dry conditions across the peninsula. Latitude variation of approximately five degrees creates measurable climate differences between northern regions near the 38th parallel and southern areas including Jeju Island. The Taebaek Mountains running north-south along the eastern coast create a rain shadow effect, producing distinct precipitation patterns between coastal and interior regions.
Seoul records average daily highs of -1°C and lows of -8°C in January. The Han River basin receives approximately 20-25 millimeters of precipitation, primarily as snow. Clear days outnumber cloudy days, with sunshine duration averaging 5-6 hours daily. The city experiences 8-12 days with measurable snowfall during the month. Wind chill from northwestern continental air masses can lower perceived temperatures to -15°C or below on the coldest days. The Bukhansan National Park north of Seoul sees deeper snow accumulation than the urban center, typically 15-30 centimeters on peaks above 500 meters elevation.
Busan on the Korea Strait coast maintains significantly warmer conditions with January highs of 7°C and lows of -1°C. The maritime influence prevents the severe cold affecting inland cities. Precipitation totals 30-40 millimeters, falling as rain rather than snow in most years. Coastal winds average 3-5 meters per second, occasionally reaching 8-10 meters per second during cold front passages. The port remains ice-free throughout winter, unlike harbors in the Yellow Sea. Sunshine duration reaches 6-7 hours daily, exceeding Seoul by approximately one hour.
Jeju Island experiences the mildest January conditions in South Korea, with Jeju City recording highs of 8°C and lows of 2°C. The island receives 60-70 millimeters of precipitation, concentrated on the northern slopes of Hallasan where orographic lifting enhances rainfall. Snow occurs above 1,000 meters elevation on Hallasan but rarely at sea level. Seogwipo on the southern coast averages 1-2°C warmer than Jeju City on the northern shore. Wind speeds average 4-6 meters per second, with stronger gusts during passages of low-pressure systems tracking through the Korea Strait. The East Sea water temperature ranges from 10-12°C, while the Yellow Sea drops to 6-8°C.
Daegu in the interior basin surrounded by the Sobaek Mountains records January highs of 5°C and lows of -4°C. The basin topography creates temperature inversions that trap cold air, producing conditions colder than the latitude suggests. Precipitation totals only 15-20 millimeters, making Daegu one of the driest regions during winter months. The Nakdong River flowing through the basin occasionally freezes along shallow sections during multi-day cold spells. Sunshine duration averages 5-6 hours daily, similar to Seoul despite the more southern position.
The Demilitarized Zone near the 38th parallel experiences January temperatures 2-3°C colder than Seoul, with highs around -3°C and lows reaching -11°C. Snow cover persists throughout the month in most years, with total accumulation of 30-50 centimeters in valleys and substantially more on higher terrain. This region receives less precipitation than coastal areas, typically 20-30 millimeters for the month. The buffer zone's minimal human activity creates a documented microclimate slightly colder than adjacent inhabited areas.
Sokcho on the East Sea coast records January highs of 3°C and lows of -4°C. The city receives 40-50 millimeters of precipitation, with approximately half falling as snow. Lake-effect snow from the East Sea produces heavier accumulations in Sokcho compared to Yellow Sea coastal cities at similar latitudes. Seoraksan National Park directly inland experiences alpine conditions with temperatures 8-10°C colder than the coast and snow depths exceeding one meter above 1,000 meters elevation. Wind speeds on the exposed eastern coastline average 4-6 meters per second, with periodic strong winds from 8-12 meters per second during winter storm passages.
Seoul's February temperatures rise slightly from January, with average highs of 2°C and lows of -6°C. Precipitation decreases to 15-20 millimeters for the month. Snowfall becomes less frequent, occurring on 5-8 days compared to January's 8-12 days. Sunshine duration increases to 6-7 hours daily as day length extends. The coldest temperatures typically occur during the first half of the month, with a gradual warming trend beginning in the final week. Ice on the Han River begins breaking up during warmer years, though cold years maintain frozen conditions into early March.
Busan February conditions show minimal change from January, with highs of 8°C and lows of 0°C. Precipitation remains steady at 35-45 millimeters. The Korea Strait water temperature reaches its annual minimum of 9-11°C during this month. Coastal fog becomes more frequent as air-sea temperature differences increase on clear mornings. Wind patterns shift slightly as the frequency of continental high-pressure systems begins decreasing toward the end of the month.
Jeju Island February temperatures hold steady at highs of 9°C and lows of 3°C. Precipitation decreases slightly to 50-60 millimeters compared to January. Hallasan maintains snow cover above 1,000 meters throughout the month, with depths of 30-60 centimeters on the summit. The flowering of early camellia varieties begins in protected southern coastal locations during the final week of February in typical years. Wind speeds average 4-5 meters per second, slightly lower than January.
Daegu experiences a slight warming with February highs of 7°C and lows of -3°C. The city remains dry with 15-20 millimeters of precipitation. Temperature inversions continue affecting air quality in the basin, particularly during multi-day high-pressure systems. Sunshine duration increases to 6-7 hours daily. The Nakdong River ice typically breaks up during the second half of the month.
Incheon on the Yellow Sea coast records February highs of 2°C and lows of -5°C. The maritime influence provides minimal warming compared to inland locations at the same latitude. Precipitation totals 20-25 millimeters, with snow occurring on 5-7 days. Tidal mudflats along the coast remain frozen during morning low tides in the first half of the month. Wind speeds average 4-6 meters per second, with Yellow Sea fetch creating choppy conditions during strong wind events.
Gyeongju in the southeastern interior records February highs of 7°C and lows of -3°C. The city receives 25-30 millimeters of precipitation. The region's numerous reservoirs begin ice-out during warmer years, though cold years maintain frozen conditions through the month. Bulguksa Temple at 500 meters elevation experiences temperatures 2-3°C colder than the city center. Sunshine duration reaches 6-7 hours daily.
Seoul March temperatures cross above freezing for daily highs, averaging 8°C, while lows remain at -1°C. Precipitation increases to 40-50 millimeters as the transition toward spring begins. Snow becomes rare after mid-month, occurring on only 2-4 days typically concentrated in the first two weeks. Cherry blossoms in the city center typically bloom during the final week of March or the first week of April, with the exact timing varying by 7-10 days between early and late years. Sunshine duration extends to 6-7 hours daily. Yellow dust events from the Gobi Desert begin affecting air quality, with the heaviest concentrations typically occurring during March and April when surface winds increase and desertification intensifies in northern China and Mongolia.
Busan experiences significant warming in March with highs of 12°C and lows of 4°C. Precipitation increases to 55-65 millimeters as spring storm systems become more frequent. Cherry blossoms along the coastal areas bloom during the final week of March in typical years, approximately one week earlier than Seoul. Sea surface temperatures in the Korea Strait begin rising, reaching 11-13°C by month's end. Wind speeds average 3-5 meters per second. The city experiences its driest conditions of the year relative to summer and winter, though absolute precipitation increases from February.
Jeju Island March conditions show noticeable warming with highs of 12°C and lows of 6°C. Precipitation increases to 70-80 millimeters as the frequency of low-pressure systems tracking through the Korea Strait intensifies. Cherry blossoms bloom in coastal areas during mid-March, making Jeju the first region in South Korea to experience this phenological marker. Hallasan summit snow begins melting, though snow cover typically persists above 1,500 meters through the end of March. Rapeseed fields in coastal areas begin flowering during the second half of the month. Wind speeds average 4-5 meters per second.
Daegu March temperatures rise to highs of 12°C and lows of 2°C. Precipitation increases substantially to 45-55 millimeters as the dry winter pattern breaks down. The city experiences rapid warming during the second half of the month, with daily temperature ranges often exceeding 10°C on clear days. Cherry blossoms bloom during the final days of March or the first days of April in typical years. Yellow dust events affect the region on 3-6 days during the month, with the heaviest concentrations reducing visibility to 5-10 kilometers.
Sokcho on the East Sea coast records March highs of 8°C and lows of 0°C. The eastern coast lags western regions in spring warming due to the colder sea surface temperatures in the East Sea. Precipitation totals 50-60 millimeters. Seoraksan National Park maintains significant snow cover above 1,000 meters, with depths of 50-100 centimeters on north-facing slopes. The park typically remains closed to higher elevation trails until late March or early April depending on snow conditions. Cherry blossoms bloom during the first week of April in Sokcho, approximately one week later than Busan.
Jeonju in the southwestern interior records March highs of 11°C and lows of 1°C. The city receives 55-65 millimeters of precipitation. The Geum River basin experiences rapid greening during the second half of March as temperatures consistently exceed 10°C during afternoon hours. Cherry blossoms bloom during the final week of March. The region's agricultural areas begin spring planting during the final days of the month, with exact timing dependent on soil temperatures.
Seoul April temperatures reach highs of 16°C and lows of 6°C. Precipitation increases to 60-70 millimeters, with rainfall becoming the dominant form of precipitation. Cherry blossoms peak during the first week of April in typical years, with the bloom period lasting 5-7 days depending on temperature and wind conditions. Gyeongbokgung Palace grounds and the Bukchon Hanok Village area experience peak visitation during the bloom period. Sunshine duration extends to 7-8 hours daily. Yellow dust events continue affecting air quality on 3-5 days during the month, though frequency begins decreasing compared to March. Daily temperature ranges often exceed 12°C on clear days, producing warm afternoons and cool mornings.
Busan April conditions warm to highs of 17°C and lows of 9°C. Precipitation totals 80-90 millimeters, making April one of the wetter spring months. The Korea Strait sea surface temperature rises to 13-15°C. Cherry blossoms have typically finished blooming by early April, with azaleas and other spring flowers reaching peak bloom during the second and third weeks. Coastal fog decreases in frequency compared to late winter months. Wind speeds average 3-4 meters per second. Beomeosa Temple in the northern hills experiences temperatures 2-3°C cooler than the coastal city center.
Jeju Island April temperatures reach highs of 16°C and lows of 10°C. Precipitation increases to 75-85 millimeters. Hallasan summit snow has typically melted by mid-April in most years, though late winters can maintain patches through the end of the month. Rapeseed flowers reach peak bloom across the island during early to mid-April, covering fields in the coastal plains. Seongsan Ilchulbong volcanic crater becomes a popular destination during this month as weather conditions stabilize. Wind speeds average 4-5 meters per second. Sea surface temperatures around the island reach 13-15°C.
Daegu experiences rapid warming in April with highs of 19°C and lows of 8°C. The city receives 55-65 millimeters of precipitation. The basin's sheltered position produces some of the highest afternoon temperatures in South Korea during this month when high-pressure systems create clear, calm conditions. Cherry blossoms peak during the first few days of April. Daily temperature ranges frequently exceed 15°C, with afternoon highs occasionally reaching 25°C during warm spells while morning lows remain near 5°C. Yellow dust events occur on 2-4 days during the month.
Seoraksan National Park trails above 1,000 meters typically open for unrestricted access during the second half of April as snow melts. Sokcho at sea level records April highs of 14°C and lows of 5°C. The East Sea coast continues lagging inland areas in warming, maintaining temperatures 2-4°C cooler than the Yellow Sea coast. Precipitation totals 60-70 millimeters. Cherry blossoms peak during the second week of April. Sea surface temperatures in the East Sea reach 11-13°C, approximately 2°C cooler than the Korea Strait.
Andong in the interior records April highs of 18°C and lows of 6°C. The city receives 50-60 millimeters of precipitation. Hahoe Folk Village experiences peak spring visitation during this month as weather conditions become favorable for outdoor activities. The Nakdong River reaches moderate flow levels as snowmelt from higher elevations combines with spring precipitation. Cherry blossoms peak during the first week of April, with the bloom period at higher elevations in the surrounding mountains extending through the second week.
Seoul May temperatures reach highs of 22°C and lows of 12°C. Precipitation increases to 90-100 millimeters as pre-monsoon storm activity intensifies. The month experiences higher rainfall totals than any period except the monsoon season from June through August. Sunshine duration reaches 7-8 hours daily. Late May occasionally sees the first days exceeding 30°C, though such extreme warmth remains infrequent. Humidity levels begin rising, with afternoon relative humidity typically 50-60 percent. The city's parks reach full green coverage, with late-blooming flowers including peonies and irises peaking during mid-May.
Busan May conditions warm to highs of 21°C and lows of 14°C. Precipitation totals 100-110 millimeters, making May one of the wettest months outside the monsoon season. The Korea Strait sea surface temperature rises to 16-18°C. Coastal areas experience frequent fog during morning hours when warm, moist air moves over the still-cool sea surface. Wind speeds average 3-4 meters per second. The city experiences its most comfortable outdoor weather of the year during May, with moderate temperatures and humidity levels lower than the approaching summer months.
Jeju Island May temperatures reach highs of 20°C and lows of 14°C. Precipitation increases substantially to 90-100 millimeters. Hallasan hiking trails reach optimal conditions during this month, with summit temperatures ranging from 10-15°C during midday hours. Azaleas bloom on the mountain slopes during early May, creating a documented floral display visible from multiple elevations. Wind speeds average 4-5 meters per second. Sea surface temperatures around the island rise to 16-18°C, making this month the beginning of the swimming season for cold-tolerant individuals, though most beach activity waits for June.
Daegu May temperatures climb to highs of 24°C and lows of 13°C. The city receives 70-80 millimeters of precipitation. The Nakdong River basin experiences its most verdant conditions of the year during late May, with agricultural areas in full spring growth. Daily temperature ranges remain large, often 12-15°C between morning lows and afternoon highs. The city occasionally records temperatures exceeding 30°C during the final week of May when high-pressure systems create clear, calm conditions. Humidity levels remain moderate, typically 50-60 percent during afternoon hours.
Jirisan National Park reaches optimal hiking conditions during May, with trails at all elevations typically snow-free and accessible. The park's elevation range from 300 meters to 1,915 meters creates diverse microclimates. Summit temperatures average 8-12°C during midday hours, approximately 10-12°C cooler than base elevations. Precipitation totals 80-100 millimeters depending on elevation, with orographic enhancement producing higher totals on the southern slopes facing the Korea Strait. Azaleas and other alpine flowers bloom during May at higher elevations.