Ulsan Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Ulsan, Chungcheongbuk-Do, South Korea. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let's break down all the details for a clearer picture.
Ulsan experiences significant rain/snowfall throughout the year, averaging 1267 mm (50 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry and rainy season during certain months. You can clearly see this in our monthly precipitation graphs below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Ulsan can be quite wet during August, receiving approximately 214 mm (8.4 in) of precipitation over 11 rainy days.
In contrast December, experiences much drier conditions, with 29 mm (1.1 in) of rainfall, spread across 5 rainy days.
August, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 169 hours of sunshine in this period. During the driest month December you can expect a temperature of 10°C (50°F). For more detailed insights into the city's temperatures, visit our Ulsan Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Explore Ulsan's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Ulsan spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in South Korea: City Comparison
The map below shows the annual precipitation across South Korea. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Ulsan vs World: Rainfall Compared
Ulsan's average annual precipitation is 1267 mm (50 in). Let's compare this to some popular worldwide tourist destinations:
Athens, Greece, receives an average annual precipitation of 400 mm (16 in), making it one of the drier Mediterranean climates with rainfall mostly in winter.
In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Climate change is affecting precipitation patterns worldwide, including Ulsan:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
- "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
- The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
- The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.
For more detailed information about Ulsan's weather, including sunshine hours, humidity levels, and temperature data, visit our Ulsan Climate page.
