Category: Extremes affecting United States

Cold spell occuring from July 27 2021 to August 08 2021 at 48.0°N 290.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 13 days

Time span: July 27 2021 to August 08 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.6 °C
  • Mean temperature: 13.4 °C
  • Minimum temperature anomaly: -9.3 °C
  • Minimum temperature: 4.4 °C

Event center: 48.0°N 290.5°E

Area affected: 1594819 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_2021-Jul-27_to_2021-Aug-08_290.5_48.0

Heat wave occuring from July 27 2021 to August 03 2021 at 55.0°N 195.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 8 days

Time span: July 27 2021 to August 03 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 2.7 °C
  • Mean temperature: 13.3 °C
  • Maximum temperature anomaly: 5.3 °C
  • Maximum temperature: 18.1 °C

Event center: 55.0°N 195.5°E

Area affected: 87062 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_2021-Jul-27_to_2021-Aug-03_195.5_55.0

Cold spell occuring from July 25 2021 to August 05 2021 at 38.0°N 235.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 12 days

Time span: July 25 2021 to August 05 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.8 °C
  • Mean temperature: 13.3 °C
  • Minimum temperature anomaly: -3.2 °C
  • Minimum temperature: 10.7 °C

Event center: 38.0°N 235.5°E

Area affected: 146144 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_2021-Jul-25_to_2021-Aug-05_235.5_38.0

Heat wave occuring from July 24 2021 to July 27 2021 at 38.0°N 241.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 4 days

Time span: July 24 2021 to July 27 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 3.7 °C
  • Mean temperature: 26.9 °C
  • Maximum temperature anomaly: 5.0 °C
  • Maximum temperature: 33.1 °C

Event center: 38.0°N 241.0°E

Area affected: 59667 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_2021-Jul-24_to_2021-Jul-27_241.0_38.0

Heat wave occuring from July 23 2021 to July 29 2021 at 44.0°N 266.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 7 days

Time span: July 23 2021 to July 29 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 5.1 °C
  • Mean temperature: 27.3 °C
  • Maximum temperature anomaly: 7.8 °C
  • Maximum temperature: 31.0 °C

Event center: 44.0°N 266.0°E

Area affected: 97655 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_2021-Jul-23_to_2021-Jul-29_266.0_44.0

Cold spell occuring from July 23 2021 to July 27 2021 at 33.5°N 248.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 5 days

Time span: July 23 2021 to July 27 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -5.1 °C
  • Mean temperature: 22.7 °C
  • Minimum temperature anomaly: -10.4 °C
  • Minimum temperature: 13.5 °C

Event center: 33.5°N 248.0°E

Area affected: 287542 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_2021-Jul-23_to_2021-Jul-27_248.0_33.5

Cold spell occuring from July 20 2021 to August 19 2021 at 59.0°N 155.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation
  • United States

Duration: 31 days

Time span: July 20 2021 to August 19 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.5 °C
  • Mean temperature: 5.2 °C
  • Minimum temperature anomaly: -11.8 °C
  • Minimum temperature: -2.7 °C

Event center: 59.0°N 155.5°E

Area affected: 2240337 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_2021-Jul-20_to_2021-Aug-19_155.5_59.0

Cold spell occuring from July 19 2021 to July 23 2021 at 34.0°N 259.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 5 days

Time span: July 19 2021 to July 23 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.1 °C
  • Mean temperature: 24.5 °C
  • Minimum temperature anomaly: -5.7 °C
  • Minimum temperature: 21.6 °C

Event center: 34.0°N 259.0°E

Area affected: 246069 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_2021-Jul-19_to_2021-Jul-23_259.0_34.0

Heat wave occuring from July 15 2021 to August 02 2021 at 70.0°N 223.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 19 days

Time span: July 15 2021 to August 02 2021

Statistics over entire affected area:

  • Mean temperature anomaly: 4.7 °C
  • Mean temperature: 15.6 °C
  • Maximum temperature anomaly: 12.7 °C
  • Maximum temperature: 24.2 °C

Event center: 70.0°N 223.0°E

Area affected: 719595 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_2021-Jul-15_to_2021-Aug-02_223.0_70.0

Cold spell occuring from July 12 2021 to July 15 2021 at 31.0°N 262.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 4 days

Time span: July 12 2021 to July 15 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -3.2 °C
  • Mean temperature: 26.1 °C
  • Minimum temperature anomaly: -4.0 °C
  • Minimum temperature: 25.1 °C

Event center: 31.0°N 262.5°E

Area affected: 73890 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_2021-Jul-12_to_2021-Jul-15_262.5_31.0