Category: Extremes affecting United Kingdom

Heat wave occuring from July 25 2025 to July 31 2025 at 52.5°N 354.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Ireland
  • United Kingdom

Duration: 7 days

Time span: July 25 2025 to July 31 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.8 °C
  • Mean temperature: 17.7 °C
  • Maximum temperature anomaly: 3.0 °C
  • Maximum temperature: 18.8 °C

Event center: 52.5°N 354.0°E

Area affected: 73200 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Jul-25_to_2025-Jul-31_354.0_52.5

Heat wave occuring from March 18 2025 to March 24 2025 at 51.0°N 6.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Belgium
  • Denmark
  • France
  • Germany
  • Netherlands
  • Spain
  • United Kingdom

Duration: 7 days

Time span: March 18 2025 to March 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.9 °C
  • Mean temperature: 11.0 °C
  • Maximum temperature anomaly: 8.9 °C
  • Maximum temperature: 15.4 °C

Event center: 51.0°N 6.0°E

Area affected: 1098801 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Mar-18_to_2025-Mar-24_6.0_51.0

Cold spell occuring from March 12 2025 to March 18 2025 at 44.5°N 359.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Andorra
  • Belgium
  • France
  • Portugal
  • Spain
  • United Kingdom

Duration: 7 days

Time span: March 12 2025 to March 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.7 °C
  • Mean temperature: 6.3 °C
  • Minimum temperature anomaly: -7.8 °C
  • Minimum temperature: -1.6 °C

Event center: 44.5°N 359.5°E

Area affected: 1142813 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2025-Mar-12_to_2025-Mar-18_359.5_44.5

Cold spell occuring from January 02 2025 to January 10 2025 at 52.5°N 353.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Ireland
  • United Kingdom

Duration: 9 days

Time span: January 02 2025 to January 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.3 °C
  • Mean temperature: 0.4 °C
  • Minimum temperature anomaly: -8.3 °C
  • Minimum temperature: -2.9 °C

Event center: 52.5°N 353.5°E

Area affected: 97715 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2025-Jan-02_to_2025-Jan-10_353.5_52.5

Cold spell occuring from December 29 2024 to January 12 2025 at 66.0°N 342.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Iceland
  • Norway
  • United Kingdom

Duration: 15 days

Time span: December 29 2024 to January 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.5 °C
  • Mean temperature: -0.6 °C
  • Minimum temperature anomaly: -19.6 °C
  • Minimum temperature: -24.0 °C

Event center: 66.0°N 342.0°E

Area affected: 2084515 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2024-Dec-29_to_2025-Jan-12_342.0_66.0

Heat wave occuring from December 14 2024 to December 21 2024 at 52.5°N 20.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Austria
  • Belarus
  • Czechia
  • Denmark
  • Germany
  • Ireland
  • Italy
  • Lithuania
  • Moldova, Republic of
  • Netherlands
  • Poland
  • Romania
  • Russian Federation
  • Slovakia
  • Sweden
  • Ukraine
  • United Kingdom

Duration: 8 days

Time span: December 14 2024 to December 21 2024

Statistics over entire affected area:

  • Mean temperature anomaly: 6.3 °C
  • Mean temperature: 7.6 °C
  • Maximum temperature anomaly: 10.8 °C
  • Maximum temperature: 12.3 °C

Event center: 52.5°N 20.5°E

Area affected: 2319160 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2024-Dec-14_to_2024-Dec-21_20.5_52.5

Cold spell occuring from December 09 2024 to December 12 2024 at 53.5°N 350.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Ireland
  • United Kingdom

Duration: 4 days

Time span: December 09 2024 to December 12 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -3.8 °C
  • Mean temperature: 3.9 °C
  • Minimum temperature anomaly: -7.1 °C
  • Minimum temperature: -0.8 °C

Event center: 53.5°N 350.0°E

Area affected: 59129 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2024-Dec-09_to_2024-Dec-12_350.0_53.5

Cold spell occuring from November 17 2024 to December 07 2024 at 64.5°N 337.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Denmark
  • Greenland
  • Iceland
  • Ireland
  • Norway
  • Sweden
  • United Kingdom

Duration: 21 days

Time span: November 17 2024 to December 07 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -6.9 °C
  • Mean temperature: -16.4 °C
  • Minimum temperature anomaly: -15.8 °C
  • Minimum temperature: -52.8 °C

Event center: 64.5°N 337.0°E

Area affected: 5118648 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2024-Nov-17_to_2024-Dec-07_337.0_64.5

Cold spell occuring from October 10 2024 to October 14 2024 at 54.5°N 357.5°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Ireland
  • United Kingdom

Duration: 5 days

Time span: October 10 2024 to October 14 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -3.5 °C
  • Mean temperature: 7.8 °C
  • Minimum temperature anomaly: -6.3 °C
  • Minimum temperature: 3.5 °C

Event center: 54.5°N 357.5°E

Area affected: 185975 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2024-Oct-10_to_2024-Oct-14_357.5_54.5

Cold spell occuring from October 05 2024 to October 14 2024 at 64.5°N 343.0°E

Download data: JSON

Event type: Cold spell

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Iceland
  • United Kingdom

Duration: 10 days

Time span: October 05 2024 to October 14 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -3.9 °C
  • Mean temperature: 3.9 °C
  • Minimum temperature anomaly: -14.4 °C
  • Minimum temperature: -15.2 °C

Event center: 64.5°N 343.0°E

Area affected: 1335609 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2024-Oct-05_to_2024-Oct-14_343.0_64.5