Europe Summer 2025 CDD Forecasts are Very Warm!

Climate Impact Company Europe Summer 2025 CDD Outlook

Issued: Thursday June 5, 2025

Headline: Europe CDD forecasts shift warmer.

Fig. 1: A consensus of selected West Europe cities monthly CDD forecasts for the 2025 warm season compared to the past 2 years and 10-year/30-year normal.

Discussion: May 2025 CDD count was an over-achiever for Europe Western Cities. The consensus of selected West Europe cities CDD in May was MUCH ABOVE normal and inspired by Heathrow and Paris-Orly with warmest departures (Fig. 1). The warm signature appears in the June and July forecast for Western Europe as the consensus of selected cities is much warmer than the 10-year normal and except for JUN-23 is the warmest of the past 3 years. The warm signature remains for late summer although closer to the 10-year normal. The Western Europe selected cities CDD forecast consensus has increased since the outlook issued on May 27^th (Fig. 2).

Fig. 2: A comparison between the West Europe selected cities monthly CDD forecasts for the 2025 warm season with the previous outlook.

Fig. 3: A consensus of selected East Europe cities monthly CDD forecasts for the 2025 warm season compared to the past 2 years and 10-year/30-year normal.

In Eastern Europe, the consensus of selected cities CDD verification for May was slightly above normal and the outlook stays in-between the 10-year and 30-year normal through July warming to near or warmer than the 10-year normal for late summer (Fig. 3). The Eastern Europe selected cities CDD forecast for the 2025 warm season has increased slightly since the previous forecast (Fig. 4).

Fig. 4: A comparison between the East Europe selected cities monthly CDD forecasts for the 2025 warm season with the previous outlook.