Category: Extremes affecting New Zealand

Heat wave occuring from July 18 2025 to August 01 2025 at -50.5°S 163.0°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 15 days

Time span: July 18 2025 to August 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 12.3 °C
  • Maximum temperature anomaly: 6.2 °C
  • Maximum temperature: 20.9 °C

Event center: -50.5°S 163.0°E

Area affected: 5441040 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-18_to_2025-Aug-01_163.0_-50.5

Heat wave occuring from June 12 2025 to June 19 2025 at -48.5°S 151.5°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • New Zealand

Duration: 8 days

Time span: June 12 2025 to June 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.6 °C
  • Mean temperature: 11.2 °C
  • Maximum temperature anomaly: 4.2 °C
  • Maximum temperature: 14.6 °C

Event center: -48.5°S 151.5°E

Area affected: 898467 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-Jun-12_to_2025-Jun-19_151.5_-48.5

Cold spell occuring from June 03 2025 to June 10 2025 at -44.0°S 170.5°E

Download data: JSON

Event type: Cold spell

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

  • New Zealand

Duration: 8 days

Time span: June 03 2025 to June 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.5 °C
  • Mean temperature: 8.9 °C
  • Minimum temperature anomaly: -8.5 °C
  • Minimum temperature: -9.7 °C

Event center: -44.0°S 170.5°E

Area affected: 611613 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-Jun-03_to_2025-Jun-10_170.5_-44.0

Heat wave occuring from April 09 2025 to April 13 2025 at -46.0°S 172.0°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 5 days

Time span: April 09 2025 to April 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.5 °C
  • Mean temperature: 13.2 °C
  • Maximum temperature anomaly: 3.6 °C
  • Maximum temperature: 14.7 °C

Event center: -46.0°S 172.0°E

Area affected: 191601 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-Apr-09_to_2025-Apr-13_172.0_-46.0

Heat wave occuring from April 02 2025 to April 04 2025 at -46.5°S 171.5°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 3 days

Time span: April 02 2025 to April 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.8 °C
  • Mean temperature: 15.4 °C
  • Maximum temperature anomaly: 4.7 °C
  • Maximum temperature: 18.8 °C

Event center: -46.5°S 171.5°E

Area affected: 320897 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-Apr-02_to_2025-Apr-04_171.5_-46.5

Heat wave occuring from March 21 2025 to March 23 2025 at -45.0°S 181.5°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 3 days

Time span: March 21 2025 to March 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.1 °C
  • Mean temperature: 16.2 °C
  • Maximum temperature anomaly: 2.4 °C
  • Maximum temperature: 17.0 °C

Event center: -45.0°S 181.5°E

Area affected: 57130 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-21_to_2025-Mar-23_181.5_-45.0

Cold spell occuring from March 05 2025 to March 16 2025 at -24.5°S 179.5°E

Download data: JSON

Event type: Cold spell

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

  • New Caledonia
  • New Zealand

Duration: 12 days

Time span: March 05 2025 to March 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 22.6 °C
  • Minimum temperature anomaly: -3.3 °C
  • Minimum temperature: 17.7 °C

Event center: -24.5°S 179.5°E

Area affected: 1633572 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-05_to_2025-Mar-16_179.5_-24.5

Heat wave occuring from February 22 2025 to March 06 2025 at -49.5°S 159.5°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica
  • Australia
  • New Zealand

Duration: 13 days

Time span: February 22 2025 to March 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 6.5 °C
  • Maximum temperature anomaly: 7.9 °C
  • Maximum temperature: 25.7 °C

Event center: -49.5°S 159.5°E

Area affected: 4485076 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-Feb-22_to_2025-Mar-06_159.5_-49.5

Cold spell occuring from February 10 2025 to February 14 2025 at -30.0°S 183.5°E

Download data: JSON

Event type: Cold spell

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

  • New Zealand

Duration: 5 days

Time span: February 10 2025 to February 14 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 21.2 °C
  • Minimum temperature anomaly: -2.3 °C
  • Minimum temperature: 18.5 °C

Event center: -30.0°S 183.5°E

Area affected: 856279 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-Feb-10_to_2025-Feb-14_183.5_-30.0

Heat wave occuring from January 03 2025 to January 25 2025 at -48.0°S 152.5°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • New Zealand

Duration: 23 days

Time span: January 03 2025 to January 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 14.0 °C
  • Maximum temperature anomaly: 6.1 °C
  • Maximum temperature: 20.7 °C

Event center: -48.0°S 152.5°E

Area affected: 2539631 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-Jan-03_to_2025-Jan-25_152.5_-48.0