Spring 2025 in Basel was warmer and sunnier than average, with an average temperature of 11.8 °C and radiation levels above both the 20-year and long-term historical means. While extreme temperatures were not reached, the season stood out for its mild conditions, few frost days, and relatively high sunshine levels compared to recent decades and the full historical record since 1865.

Spring 2025 was characterized by a range of weather conditions, with temperatures spanning from a chilly -2.0°C on March 3rd to a warm 30.9°C on May 31st. The average temperature for the season was 11.8°C. Total precipitation was moderate, with the wettest day occurring on April 13th, recording 17.5 mm of rain. The average humidity was 67%, and cloud cover was at 59%. Radiation levels averaged 190 W/m², indicating a fair amount of sunshine throughout the season.

This spring featured 6 summer days and 1 heat day, with no tropical nights. There were 5 frost days, but no ice days were recorded.

Historical Comparisons

Last 20 Years

When compared to the last 20 years, Spring 2025 was slightly warmer, with an average temperature of 11.8°C compared to the 20-year average of 11.0°C. The maximum temperature recorded this spring (30.9°C) was lower than the highest in the past 20 years (32.7°C), and the minimum temperature (-2.0°C) was significantly warmer than the coldest (-14.7°C) recorded in the same period.

The season's radiation levels were higher than the 20-year average of 175 W/m², while cloud cover was lower than the average of 67%. The number of summer days (6) and heat days (1) were within the typical range, given the 20-year totals of 150 summer days and 13 heat days. Frost days (5) were fewer compared to the 20-year count of 205, and no ice days were recorded, aligning with the low 20-year count of 6.

All-Time Records

Looking at the entire historical record since 1865, Spring 2025's average temperature of 11.8°C was notably higher than the long-term average of 9.7°C. The maximum temperature of 30.9°C was below the all-time high of 33.5°C, and the minimum temperature of -2.0°C was much warmer than the record low of -14.8°C.

Radiation levels were significantly higher than the historical average of 165 W/m², and cloud cover was lower than the long-term average of 66%. The number of summer days and heat days this spring were modest in the context of historical totals of 752 and 68, respectively. Frost days were notably fewer than the historical total of 1825, and no ice days were recorded, compared to the historical count of 42.

Conclusion

Spring 2025 was a season marked by warmer-than-average temperatures and higher radiation levels, with fewer frost days than typically observed in both recent decades and the long-term historical record. While not breaking any extreme temperature records, the season's warmth and sunshine were notable, especially when viewed against the backdrop of historical climate data.

Disclaimer: This content has been generated by an AI algorithm.