First Summerday in 2026 on 2026-05-27
May 28, 2026Yesterday’s maximum temperature of 31.8 degrees Celsius marked the first summer day of the year, with 13.9 hours of sunshine. This occurrence ranks as the 139th earliest since 1876, placing it in the 99th percentile.
Yesterday’s maximum temperature reached 31.8 degrees Celsius, and I am delighted to announce that this marks the first summer day of the year. The day was exceptionally sunny, with 13.9 hours of sunshine, which corresponds to 95 percent of the possible sunshine.
Comparing the date of this first summer day to historic records, this occurrence ranks as the 139th earliest since 1876, placing it in the 99th percentile. For reference, the earliest first summer day on record occurred on March 30, 1989, while the latest occurred on June 15, 1991.
Table 1: Top 5 Years with earliest Summer Day
| Year | Date | Day of Year | Max. Temperature [°C] | Avg. Temperature [°C] |
|---|---|---|---|---|
| 1989 | 1989-03-30 | 89 | 25.2 | 16.4 |
| 2021 | 2021-03-31 | 90 | 25.0 | 15.7 |
| 1949 | 1949-04-04 | 94 | 25.0 | 15.4 |
| 1985 | 1985-04-04 | 94 | 25.2 | 15.8 |
| 1961 | 1961-04-05 | 95 | 25.1 | 14.9 |
Table 2: Bottom 5 Years with latest Summer Day
| Year | Date | Day of Year | Max. Temperature [°C] | Avg. Temperature [°C] |
|---|---|---|---|---|
| 1991 | 1991-06-15 | 166 | 26.8 | 19.9 |
| 1984 | 1984-06-13 | 165 | 25.5 | 18.3 |
| 1970 | 1970-06-07 | 158 | 26.1 | 19.8 |
| 1911 | 1911-06-06 | 157 | 25.5 | 19.4 |
| 1980 | 1980-06-05 | 157 | 25.1 | 17.7 |
Figure 1: First Summer-Day since 1876
🤖 This text was generated with the assistance of AI. All quantitative statements are derived directly from the dataset listed under Data Source.