Category: Extremes affecting Finland

Cold spell occuring from August 19 2025 to August 28 2025 at 60.0°N 19.0°E

Download data: JSON

Event type: Cold spell

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

  • Belarus
  • Denmark
  • Estonia
  • Finland
  • Germany
  • Hungary
  • Latvia
  • Lithuania
  • Norway
  • Poland
  • Romania
  • Russian Federation
  • Slovakia
  • Sweden
  • Ukraine

Duration: 10 days

Time span: August 19 2025 to August 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: 11.1 °C
  • Minimum temperature anomaly: -8.3 °C
  • Minimum temperature: 1.3 °C

Event center: 60.0°N 19.0°E

Area affected: 3064720 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-Aug-19_to_2025-Aug-28_19.0_60.0

Cold spell occuring from May 04 2025 to May 09 2025 at 62.5°N 23.5°E

Download data: JSON

Event type: Cold spell

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

  • Finland
  • Norway
  • Russian Federation
  • Sweden

Duration: 6 days

Time span: May 04 2025 to May 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.1 °C
  • Mean temperature: 1.1 °C
  • Minimum temperature anomaly: -6.5 °C
  • Minimum temperature: -3.3 °C

Event center: 62.5°N 23.5°E

Area affected: 264941 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-May-04_to_2025-May-09_23.5_62.5

Cold spell occuring from April 18 2025 to April 27 2025 at 74.0°N 350.5°E

Download data: JSON

Event type: Cold spell

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

  • Finland
  • Greenland
  • Norway
  • Sweden

Duration: 10 days

Time span: April 18 2025 to April 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.0 °C
  • Mean temperature: -2.9 °C
  • Minimum temperature anomaly: -9.2 °C
  • Minimum temperature: -18.7 °C

Event center: 69.5°N 18.0°E

Area affected: 939861 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-Apr-18_to_2025-Apr-27_350.5_74.0

Heat wave occuring from March 18 2025 to March 23 2025 at 57.5°N 23.5°E

Download data: JSON

Event type: Heat wave

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

  • Estonia
  • Finland
  • Russian Federation

Duration: 6 days

Time span: March 18 2025 to March 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.3 °C
  • Mean temperature: 3.6 °C
  • Maximum temperature anomaly: 6.6 °C
  • Maximum temperature: 5.2 °C

Event center: 57.5°N 23.5°E

Area affected: 97837 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-23_23.5_57.5

Cold spell occuring from January 01 2025 to January 06 2025 at 67.5°N 25.0°E

Download data: JSON

Event type: Cold spell

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

  • Finland
  • Norway
  • Sweden

Duration: 6 days

Time span: January 01 2025 to January 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -13.1 °C
  • Mean temperature: -22.6 °C
  • Minimum temperature anomaly: -19.8 °C
  • Minimum temperature: -30.2 °C

Event center: 67.5°N 25.0°E

Area affected: 83710 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-01_to_2025-Jan-06_25.0_67.5

Heat wave occuring from December 24 2024 to December 30 2024 at 66.0°N 20.5°E

Download data: JSON

Event type: Heat wave

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

  • Finland
  • Norway
  • Sweden

Duration: 7 days

Time span: December 24 2024 to December 30 2024

Statistics over entire affected area:

  • Mean temperature anomaly: 9.1 °C
  • Mean temperature: 1.8 °C
  • Maximum temperature anomaly: 14.1 °C
  • Maximum temperature: 9.1 °C

Event center: 66.0°N 20.5°E

Area affected: 336076 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-24_to_2024-Dec-30_20.5_66.0

Cold spell occuring from December 12 2024 to December 19 2024 at 69.0°N 35.0°E

Download data: JSON

Event type: Cold spell

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

  • Finland
  • Norway
  • Russian Federation
  • Sweden

Duration: 8 days

Time span: December 12 2024 to December 19 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -11.7 °C
  • Mean temperature: -19.1 °C
  • Minimum temperature anomaly: -20.7 °C
  • Minimum temperature: -32.6 °C

Event center: 69.0°N 35.0°E

Area affected: 509548 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-12_to_2024-Dec-19_35.0_69.0

Heat wave occuring from November 25 2024 to December 01 2024 at 60.0°N 26.5°E

Download data: JSON

Event type: Heat wave

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

  • Estonia
  • Finland
  • Russian Federation

Duration: 7 days

Time span: November 25 2024 to December 01 2024

Statistics over entire affected area:

  • Mean temperature anomaly: 5.7 °C
  • Mean temperature: 6.0 °C
  • Maximum temperature anomaly: 8.4 °C
  • Maximum temperature: 10.5 °C

Event center: 60.0°N 26.5°E

Area affected: 190304 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-Nov-25_to_2024-Dec-01_26.5_60.0

Cold spell occuring from November 21 2024 to November 24 2024 at 60.5°N 18.0°E

Download data: JSON

Event type: Cold spell

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

  • Finland
  • Sweden

Duration: 4 days

Time span: November 21 2024 to November 24 2024

Statistics over entire affected area:

  • Mean temperature anomaly: -5.8 °C
  • Mean temperature: -3.9 °C
  • Minimum temperature anomaly: -9.9 °C
  • Minimum temperature: -8.9 °C

Event center: 60.5°N 18.0°E

Area affected: 84315 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-21_to_2024-Nov-24_18.0_60.5

Heat wave occuring from November 12 2024 to November 16 2024 at 63.0°N 20.0°E

Download data: JSON

Event type: Heat wave

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

  • Finland
  • Sweden

Duration: 5 days

Time span: November 12 2024 to November 16 2024

Statistics over entire affected area:

  • Mean temperature anomaly: 6.6 °C
  • Mean temperature: 5.3 °C
  • Maximum temperature anomaly: 10.9 °C
  • Maximum temperature: 8.6 °C

Event center: 63.0°N 20.0°E

Area affected: 91600 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-Nov-12_to_2024-Nov-16_20.0_63.0