Source: Killer Heat in the United States: Climate Choices and the Future of Dangerously Hot Days.

The data reported here do not capture the unique characteristics of urban areas and the associated urban heat island effect, nor do the projections consider future urban development or land-cover changes that would influence future climate extremes.

Because substantial warming is projected to occur over the course of those periods, the number of extreme heat index days is likely to be lower than the reported averages at the beginning of each 30-year period and higher at the end.

The results reported are averages over 30-year periods.

Different climate downscaling techniques could produce different results.

The climate model data used for this analysis were created using the Multivariate Adaptive Constructed Analogs (MACA) method.

X actual value of average temperature for January. The index also does not include wind speed, cloudiness, shade levels, or any other factors, although those are known to affect heat-related impacts. An anomaly is the difference between an actual value and some long-term average value.

Variations in clothing thickness, height, weight, age, health, and physical activity are not accounted for in the heat index calculation. The heat index is based on physiological assumptions that assess the impacts of hot and humid weather on humans.When applying these results to any location or population, a number of limitations should be considered: What is the ideal body temperature range A normal body temperature is generally considered to be anywhere between 36.1C and 37.4C. Whereas in February the lowest average water temperature is measured at 4.00☌ 39.20☏. Tool to calculate average daily maximum, daily minimum and daily average temperature from period specified by user and compared to past years and climatological. In August, the highest average water temperature for this place is reached with on average 23.70☌ 74.66☏. The National Weather Service will initiate alert procedures when the Heat Index is expected to exceed 105 °-110 ☏ (depending on local climate) for at least 2 consecutive days. In New York, the annual water temperature (Atlantic Ocean) is on average 13.30☌ 55.94☏. The orange area without numbers indicates extreme danger.

As an example, if the air temperature is 88 ☏ and the relative humidity is 80%, the heat index–how hot it feels–is 106 ☏. To find the Heat Index temperature, look at the Heat Index Chart above or check this Heat Index Calculator.

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