First Summerday in 2026 on 2026-05-22
May 23, 2026Yesterday’s maximum temperature of 27.4 degrees Celsius marked the first summer day of the year, with 14.3 hours of sunshine. This occurrence ranks as the 139th earliest on record, placing it in the 99th percentile for lateness.
Yesterday’s maximum temperature reached 27.4 degrees Celsius, marking the first summer day of the year. The day was exceptionally bright, with 14.3 hours of sunshine and 100 percent of possible sunshine recorded.
This occurrence ranks as the 139th earliest first summer day on record, placing it in the 99th percentile for lateness. For comparison, the earliest first summer day since 1876 occurred on March 30, 1989, while the latest was 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.