Category: Extremes affecting New Zealand

Heat wave occuring from May 22 2023 to June 05 2023 at -46.5°S 173.5°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica
  • New Zealand

Duration: 15 days

Time span: May 22 2023 to June 05 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 3.0 °C
  • Mean temperature: 10.4 °C
  • Maximum temperature anomaly: 9.0 °C
  • Maximum temperature: 21.6 °C

Event center: -46.5°S 173.5°E

Area affected: 6853812 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_2023-May-22_to_2023-Jun-05_173.5_-46.5

Heat wave occuring from May 15 2023 to May 25 2023 at -48.0°S 181.0°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica
  • New Zealand

Duration: 11 days

Time span: May 15 2023 to May 25 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 4.1 °C
  • Mean temperature: 6.6 °C
  • Maximum temperature anomaly: 15.0 °C
  • Maximum temperature: 17.1 °C

Event center: -48.0°S 181.0°E

Area affected: 5304345 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_2023-May-15_to_2023-May-25_181.0_-48.0

Heat wave occuring from April 09 2023 to April 12 2023 at -39.5°S 178.5°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 4 days

Time span: April 09 2023 to April 12 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 3.0 °C
  • Mean temperature: 17.9 °C
  • Maximum temperature anomaly: 4.7 °C
  • Maximum temperature: 19.8 °C

Event center: -39.5°S 178.5°E

Area affected: 52981 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_2023-Apr-09_to_2023-Apr-12_178.5_-39.5

Heat wave occuring from April 07 2023 to April 12 2023 at -48.0°S 175.5°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 6 days

Time span: April 07 2023 to April 12 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 2.3 °C
  • Mean temperature: 12.6 °C
  • Maximum temperature anomaly: 3.7 °C
  • Maximum temperature: 15.5 °C

Event center: -48.0°S 175.5°E

Area affected: 433729 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_2023-Apr-07_to_2023-Apr-12_175.5_-48.0

Cold spell occuring from March 28 2023 to March 30 2023 at -43.5°S 171.0°E

Download data: JSON

Event type: Cold spell

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

  • New Zealand

Duration: 3 days

Time span: March 28 2023 to March 30 2023

Statistics over entire affected area:

  • Mean temperature anomaly: -6.7 °C
  • Mean temperature: 4.3 °C
  • Minimum temperature anomaly: -11.4 °C
  • Minimum temperature: -3.1 °C

Event center: -43.5°S 171.0°E

Area affected: 80029 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_2023-Mar-28_to_2023-Mar-30_171.0_-43.5

Cold spell occuring from March 28 2023 to March 30 2023 at -39.0°S 175.5°E

Download data: JSON

Event type: Cold spell

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

  • New Zealand

Duration: 3 days

Time span: March 28 2023 to March 30 2023

Statistics over entire affected area:

  • Mean temperature anomaly: -3.5 °C
  • Mean temperature: 13.0 °C
  • Minimum temperature anomaly: -6.9 °C
  • Minimum temperature: 5.1 °C

Event center: -39.0°S 175.5°E

Area affected: 84356 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_2023-Mar-28_to_2023-Mar-30_175.5_-39.0

Heat wave occuring from February 22 2023 to May 10 2023 at -49.0°S 194.5°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica
  • Australia
  • New Zealand

Duration: 78 days

Time span: February 22 2023 to May 10 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 8.4 °C
  • Mean temperature: -16.0 °C
  • Maximum temperature anomaly: 27.1 °C
  • Maximum temperature: 29.0 °C

Event center: -49.0°S 194.5°E

Area affected: 27226859 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_2023-Feb-22_to_2023-May-10_194.5_-49.0

Heat wave occuring from February 10 2023 to February 22 2023 at -43.0°S 169.0°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • New Zealand

Duration: 13 days

Time span: February 10 2023 to February 22 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 14.4 °C
  • Maximum temperature anomaly: 5.2 °C
  • Maximum temperature: 21.1 °C

Event center: -43.0°S 169.0°E

Area affected: 4482962 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_2023-Feb-10_to_2023-Feb-22_169.0_-43.0

Cold spell occuring from December 29 2022 to December 31 2022 at -31.5°S 184.0°E

Download data: JSON

Event type: Cold spell

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

  • New Zealand

Duration: 3 days

Time span: December 29 2022 to December 31 2022

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 19.0 °C
  • Minimum temperature anomaly: -2.1 °C
  • Minimum temperature: 17.4 °C

Event center: -31.5°S 184.0°E

Area affected: 221152 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_2022-Dec-29_to_2022-Dec-31_184.0_-31.5

Heat wave occuring from December 28 2022 to February 11 2023 at -22.0°S 174.5°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • Fiji
  • New Caledonia
  • New Zealand
  • Norfolk Island
  • Papua New Guinea
  • Solomon Islands
  • Tonga
  • Vanuatu

Duration: 46 days

Time span: December 28 2022 to February 11 2023

Statistics over entire affected area:

  • Mean temperature anomaly: 2.1 °C
  • Mean temperature: 21.6 °C
  • Maximum temperature anomaly: 11.2 °C
  • Maximum temperature: 29.4 °C

Event center: -22.0°S 174.5°E

Area affected: 15248407 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_2022-Dec-28_to_2023-Feb-11_174.5_-22.0