This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the length of heat waves as defined by the number of consecutive days in which the heat wave threshold of the 90th percentile is met by the daily maximum apparent temperature for 0.5° lat/lon grid boxes where USHCN station data are available.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the daily maximum apparent temperature percentile category (below 80th percentile, 80-85th, 85-90th, 90-95th, or 95th and greater) for 0.5° lat/lon grid boxes where USHCN station data are available. For example, the 90-95th percentile category means that the percentile is at least 90, but less than 95.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the length of heat waves as defined by the number of consecutive days in which the heat wave threshold of the 90th percentile is met by the daily maximum temperature for 0.5° lat/lon grid boxes where USHCN station data are available.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the daily maximum temperature percentile category (below 80th percentile, 80-85th, 85-90th, 90-95th, or 95th and greater) for 0.5° lat/lon grid boxes where USHCN station data are available. For example, the 90-95th percentile category means that the percentile is at least 90, but less than 95.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the length of heat waves as defined by the number of consecutive days in which the heat wave threshold of the 90th percentile is met by the daily minimum apparent temperature for 0.5° lat/lon grid boxes where USHCN station data are available.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the daily minimum apparent temperature percentile category (below 80th percentile, 80-85th, 85-90th, 90-95th, or 95th and greater) for 0.5° lat/lon grid boxes where USHCN station data are available. For example, the 90-95th percentile category means that the percentile is at least 90, but less than 95.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the length of heat waves as defined by the number of consecutive days in which the heat wave threshold the 90th percentile is met by the daily minimum temperature for 0.5° lat/lon grid boxes where USHCN station data are available.

This map shows, on a daily basis during the warm months of the year (1 May to 30 Sep) in the United States, the daily minimum temperature percentile category (below 80th percentile, 80-85th, 85-90th, 90-95th, or 95th and greater) for 0.5° lat/lon grid boxes where USHCN station data are available. For example, the 90-95th percentile category means that the percentile is at least 90, but less than 95.