Category: Extremes affecting Mongolia

Heat wave occuring from December 13 2025 to December 18 2025 at 45.5°N 91.5°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Kazakhstan
  • Mongolia
  • Russian Federation

Duration: 6 days

Time span: December 13 2025 to December 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.1 °C
  • Mean temperature: -8.7 °C
  • Maximum temperature anomaly: 14.2 °C
  • Maximum temperature: 0.2 °C

Event center: 45.5°N 91.5°E

Area affected: 776249 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-Dec-13_to_2025-Dec-18_91.5_45.5

Cold spell occuring from December 04 2025 to January 31 2026 at 58.0°N 223.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • China
  • Japan
  • Kazakhstan
  • Korea, Democratic People’s Republic of
  • Korea, Republic of
  • Mongolia
  • Russian Federation
  • United States

Duration: 59 days

Time span: December 04 2025 to January 31 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -11.4 °C
  • Mean temperature: -27.7 °C
  • Minimum temperature anomaly: -31.7 °C
  • Minimum temperature: -55.5 °C

Event center: 58.0°N 223.5°E

Area affected: 24818667 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-Dec-04_to_2026-Jan-31_223.5_58.0

Cold spell occuring from November 30 2025 to December 03 2025 at 49.0°N 105.0°E

Download data: JSON

Event type: Cold spell

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

  • Mongolia
  • Russian Federation

Duration: 4 days

Time span: November 30 2025 to December 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -10.4 °C
  • Mean temperature: -26.3 °C
  • Minimum temperature anomaly: -16.8 °C
  • Minimum temperature: -34.2 °C

Event center: 49.0°N 105.0°E

Area affected: 108825 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-Nov-30_to_2025-Dec-03_105.0_49.0

Cold spell occuring from November 30 2025 to December 03 2025 at 49.0°N 119.5°E

Download data: JSON

Event type: Cold spell

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

  • China
  • Mongolia

Duration: 4 days

Time span: November 30 2025 to December 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -9.3 °C
  • Mean temperature: -26.9 °C
  • Minimum temperature anomaly: -12.5 °C
  • Minimum temperature: -30.6 °C

Event center: 49.0°N 119.5°E

Area affected: 61582 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-Nov-30_to_2025-Dec-03_119.5_49.0

Heat wave occuring from November 27 2025 to November 30 2025 at 35.5°N 109.0°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Mongolia

Duration: 4 days

Time span: November 27 2025 to November 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.0 °C
  • Mean temperature: 3.8 °C
  • Maximum temperature anomaly: 10.9 °C
  • Maximum temperature: 9.5 °C

Event center: 35.5°N 109.0°E

Area affected: 435077 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-Nov-27_to_2025-Nov-30_109.0_35.5

Heat wave occuring from November 25 2025 to November 29 2025 at 41.5°N 98.5°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Mongolia

Duration: 5 days

Time span: November 25 2025 to November 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 7.2 °C
  • Mean temperature: 2.7 °C
  • Maximum temperature anomaly: 12.6 °C
  • Maximum temperature: 8.9 °C

Event center: 41.5°N 98.5°E

Area affected: 120867 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-Nov-25_to_2025-Nov-29_98.5_41.5

Heat wave occuring from November 17 2025 to November 28 2025 at 50.5°N 105.5°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Mongolia
  • Russian Federation

Duration: 12 days

Time span: November 17 2025 to November 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 10.9 °C
  • Mean temperature: -5.0 °C
  • Maximum temperature anomaly: 18.8 °C
  • Maximum temperature: 4.9 °C

Event center: 50.5°N 105.5°E

Area affected: 582941 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-Nov-17_to_2025-Nov-28_105.5_50.5

Cold spell occuring from November 15 2025 to November 19 2025 at 42.5°N 100.5°E

Download data: JSON

Event type: Cold spell

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

  • China
  • Mongolia

Duration: 5 days

Time span: November 15 2025 to November 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.2 °C
  • Mean temperature: -8.5 °C
  • Minimum temperature anomaly: -12.3 °C
  • Minimum temperature: -22.6 °C

Event center: 42.5°N 100.5°E

Area affected: 444382 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-Nov-15_to_2025-Nov-19_100.5_42.5

Cold spell occuring from September 30 2025 to November 04 2025 at 50.0°N 100.0°E

Download data: JSON

Event type: Cold spell

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

  • China
  • Hong Kong
  • Japan
  • Kazakhstan
  • Korea, Democratic People’s Republic of
  • Lao People’s Democratic Republic
  • Mongolia
  • Russian Federation
  • United States
  • Viet Nam

Duration: 36 days

Time span: September 30 2025 to November 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.8 °C
  • Mean temperature: -1.0 °C
  • Minimum temperature anomaly: -23.4 °C
  • Minimum temperature: -32.6 °C

Event center: 50.0°N 100.0°E

Area affected: 19274293 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-Sep-30_to_2025-Nov-04_100.0_50.0

Heat wave occuring from September 10 2025 to September 12 2025 at 43.0°N 112.0°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Mongolia

Duration: 3 days

Time span: September 10 2025 to September 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.7 °C
  • Mean temperature: 21.9 °C
  • Maximum temperature anomaly: 7.2 °C
  • Maximum temperature: 24.1 °C

Event center: 43.0°N 112.0°E

Area affected: 68109 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-Sep-10_to_2025-Sep-12_112.0_43.0