First Summerday in 2026 on 2026-05-25
May 26, 2026Yesterday reached 31.2 degrees Celsius with 13.4 hours of sunshine, marking the first summer day of the year. This occurrence ranks at the 84th percentile compared to historic data.
Yesterday's maximum temperature reached 31.2 degrees Celsius, and I am delighted to announce that this is the first summer day of the year. The day featured 13.4 hours of sunshine, which is 92.0 percent of the possible sunshine.
Comparing this date to historic data, this occurrence ranks at the 139th position, placing it in the 84th percentile. Table 1 shows the top earliest summer days, with the earliest on record occurring on March 30, 1989. Table 2 shows the latest summer days, with the latest on record occurring 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.