Category: Cold spells affecting United States

Cold spell occuring from September 23 2021 to September 26 2021 at 29.0°N 270.5°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: September 23 2021 to September 26 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -3.5 °C
  • Mean temperature: 22.1 °C
  • Minimum temperature anomaly: -6.0 °C
  • Minimum temperature: 16.5 °C

Event center: 29.0°N 270.5°E

Area affected: 372756 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-Sep-23_to_2021-Sep-26_270.5_29.0

Cold spell occuring from September 21 2021 to October 12 2021 at 56.5°N 206.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 22 days

Time span: September 21 2021 to October 12 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -3.3 °C
  • Mean temperature: 6.3 °C
  • Minimum temperature anomaly: -15.2 °C
  • Minimum temperature: -19.9 °C

Event center: 56.5°N 206.0°E

Area affected: 3952034 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-Sep-21_to_2021-Oct-12_206.0_56.5

Cold spell occuring from September 20 2021 to October 01 2021 at 65.5°N 222.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 12 days

Time span: September 20 2021 to October 01 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.4 °C
  • Mean temperature: -4.8 °C
  • Minimum temperature anomaly: -16.5 °C
  • Minimum temperature: -18.5 °C

Event center: 65.5°N 222.0°E

Area affected: 351902 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-Sep-20_to_2021-Oct-01_222.0_65.5

Cold spell occuring from September 14 2021 to September 18 2021 at 34.5°N 239.5°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: September 14 2021 to September 18 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 15.2 °C
  • Minimum temperature anomaly: -3.7 °C
  • Minimum temperature: 13.5 °C

Event center: 34.5°N 239.5°E

Area affected: 51321 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-Sep-14_to_2021-Sep-18_239.5_34.5

Cold spell occuring from August 20 2021 to September 11 2021 at 39.0°N 234.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 23 days

Time span: August 20 2021 to September 11 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -1.6 °C
  • Mean temperature: 17.1 °C
  • Minimum temperature anomaly: -4.2 °C
  • Minimum temperature: 11.0 °C

Event center: 39.0°N 234.5°E

Area affected: 939901 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-Aug-20_to_2021-Sep-11_234.5_39.0

Cold spell occuring from August 17 2021 to August 24 2021 at 39.5°N 247.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 8 days

Time span: August 17 2021 to August 24 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -6.5 °C
  • Mean temperature: 13.6 °C
  • Minimum temperature anomaly: -12.9 °C
  • Minimum temperature: 3.6 °C

Event center: 39.5°N 247.5°E

Area affected: 1271579 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-Aug-17_to_2021-Aug-24_247.5_39.5

Cold spell occuring from August 11 2021 to August 17 2021 at 31.5°N 254.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 7 days

Time span: August 11 2021 to August 17 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.4 °C
  • Mean temperature: 21.9 °C
  • Minimum temperature anomaly: -6.9 °C
  • Minimum temperature: 17.0 °C

Event center: 31.5°N 254.0°E

Area affected: 204496 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-Aug-11_to_2021-Aug-17_254.0_31.5

Cold spell occuring from August 09 2021 to August 21 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):

  • United States

Duration: 13 days

Time span: August 09 2021 to August 21 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -4.2 °C
  • Mean temperature: 27.3 °C
  • Minimum temperature anomaly: -6.0 °C
  • Minimum temperature: 18.5 °C

Event center: 33.5°N 248.0°E

Area affected: 67250 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-Aug-09_to_2021-Aug-21_248.0_33.5

Cold spell occuring from August 03 2021 to August 07 2021 at 31.5°N 277.5°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: August 03 2021 to August 07 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -2.9 °C
  • Mean temperature: 24.0 °C
  • Minimum temperature anomaly: -5.2 °C
  • Minimum temperature: 21.0 °C

Event center: 31.5°N 277.5°E

Area affected: 129275 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-Aug-03_to_2021-Aug-07_277.5_31.5

Cold spell occuring from August 01 2021 to August 07 2021 at 27.5°N 259.5°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 7 days

Time span: August 01 2021 to August 07 2021

Statistics over entire affected area:

  • Mean temperature anomaly: -3.9 °C
  • Mean temperature: 23.9 °C
  • Minimum temperature anomaly: -6.3 °C
  • Minimum temperature: 15.6 °C

Event center: 27.5°N 259.5°E

Area affected: 669614 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-Aug-01_to_2021-Aug-07_259.5_27.5