A Fancy Project

Abstract

Cherry blossom flowering dates are closely connected to regional climate and seasonal temperature patterns in South Korea. This project explores how flowering timing differs across regions and years by using seasonal observation data and ASOS weather data from the Korea Meteorological Administration (KMA). Through a series of visualizations, we examine regional flowering differences in 2026, compare these dates against historical averages, and investigate how temperature build-up before flowering may influence blooming patterns. In addition, we present long-term trend visualizations showing that flowering dates in Korea have consistently trended earlier over time, while specific locations like Bukchuncheon continue to show strong year-to-year variability. Together, these visualizations construct a visual narrative demonstrating how cherry blossoms can serve as an indicator of spring timing, regional climate variation, and long-term environmental change in Korea.

1. Regional Differences in Cherry Blossom Flowering Dates

Cherry blossom flowering dates in 2026 varied clearly across South Korea. Blossoms appeared in some regions in late March, while in others, they did not emerge until mid-April. This section compares flowering dates by region, then examines whether flowering occurred earlier or later in each region compared to its historical average flowering date.

flowering dates by region — Figure 1. Flowering dates by region in 2026.

The first visualization shows clear regional differences in cherry blossom flowering dates across Korea in 2026. Flowering dates were spread across several weeks, ranging from March 24 in Changwon to April 15 in Baengnyeongdo. Flowering occurred relatively early in some regions, while others experienced noticeably later blooming periods. This pattern suggests that spring arrives at different times depending on the region.

days compared to normal flowering dates — Figure 2. Difference between 2026 flowering dates and long-term normal dates.

The second visualization compares 2026 flowering dates with long-term normal flowering dates. Most regions bloomed earlier than normal. Seoul showed the largest early difference, blooming 10 days earlier than normal. Cheongju was 8 days earlier, while Incheon and Bukchuncheon were 7 days earlier. However, some regions were exceptions: Seogwipo bloomed 9 days later than normal, and Jeju bloomed 3 days later. This shows that the overall pattern was earlier flowering in 2026, but the pattern was not exactly the same everywhere.

2. Temperature Patterns Before Flowering

avg temperature b4 flowering — Figure 3. Regional average temperatures and flowering dates in 2026.

This visualization compares regional average temperatures with cherry blossom flowering dates in 2026. In warmer southern regions such as Busan and Changwon, flowering occurred earlier, while in colder northern regions such as Bukchuncheon and Baengnyeongdo, blossoms appeared later. Overall, the graph suggests a clear relationship between higher temperatures and earlier flowering dates. This reinforces the conclusion that regional climate conditions strongly influence the timing of the spring bloom.

example: Northern Chuncheon — Figure 4. Temperature build-up before flowering in Bukchuncheon, 2026.

Figure 4 focuses on temperature changes in Bukchuncheon before flowering. The graph shows that temperatures gradually increased from February to early April, especially before budburst and flowering. Rather than responding to a single warm day, cherry blossoms appear to respond to a sustained accumulation of warmer temperatures over time. This suggests that temperature accumulation before flowering is a key factor in determining the exact onset of the bloom.

3. Long-Term Changes in Cherry Blossom Flowering

flowering trend (national) — Figure 5. Long-term trend in average cherry blossom flowering dates across Korea.

The fifth visualization shows long-term changes in average cherry blossom flowering dates across Korea. Although flowering dates vary from year to year, the overall historical trend has steadily advanced over time, indicating earlier flowering dates in recent decades. Forecasts based on this data indicate that this trend is likely to persist into the future. Ultimately, this highlights that spring flowering timing in Korea has changed gradually over time.

flowering trend (bukchuncheon) — Figure 6. Local Variability in Bukchuncheon (Northern Chuncheon)

Figure 6 focuses on Bukchuncheon as a local case study. In contrast to the national average trend, the Bukchuncheon data show stronger year-to-year fluctuations in flowering timing. Even though the overall trend still shifts steadily toward earlier flowering dates, local variability remains a substantial factor. This suggests that long-term flowering patterns are influenced not only by broader climate trends, but also by regional environmental conditions and annual weather variations.

Outro

Through these visualizations, our project explored how cherry blossom flowering patterns vary across regions, respond to temperature conditions, and change over time in Korea. The results showed that flowering dates exhibited clear regional differences in 2026, that blossoms appeared earlier than their historical averages in many regions, and that a sustained accumulation of warmer temperatures before flowering appears to influence the exact timing of the bloom. In addition, long-term trend visualizations suggested that flowering dates in Korea have consistently trended earlier over time, while specific locations such as Bukchuncheon continue to show noticeable year-to-year variability.
Ultimately, these findings highlight that cherry blossoms are more than just a seasonal event. They can also serve as a powerful visual indicator of regional climate variations, the timing of spring, and long-term environmental changes in Korea. Future iterations of this project could be expanded by including additional climate variables, broader regional comparisons, and interactive web-based visualizations.

References and Data Sources

Korea Meteorological Administration (KMA). “Seasonal Observation Data.” KMA Weather Data Service System. Accessed May 2026. https://data.kma.go.kr/data/seasonObs/seasonObsDataList.do?pgmNo=648

Korea Meteorological Administration (KMA). “ASOS Weather Observation Data.” KMA Weather Data Service System. Accessed May 2026. https://data.kma.go.kr/data/grnd/selectAsosRltmList.do?pgmNo=36

Cherry Blossoms and the Timing of Spring in South Korea