What is the difference between high and low temperature

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Next, for each year, the total number of days with maximum temperatures higher than the 95 th percentile that is, unusually hot days was determined.

The map shows how the total number of unusually hot days per year at each station has changed over time. Figure 4 is similar except that it looks at unusually cold days, based on the 5 th percentile of daily minimum temperatures. Many people are familiar with record daily high and low temperatures, which are frequently mentioned in weather reports. Figure 5 depicts trends in these records by comparing the number of record-setting highs with the number of record-setting lows by decade.

These data come from a set of weather stations that have collected data consistently since Temperature data are less certain for the early part of the 20 th century because fewer stations were operating at that time. In addition, measuring devices and methods have changed over time, and some stations have moved.

The data have been adjusted to the extent possible to account for some of these influences and biases, however, and these uncertainties are not sufficient to change the fundamental trends shown in the figures. The data for this indicator are based on measurements from weather stations managed by the National Oceanic and Atmospheric Administration. Figures 1 and 2 come from the U. Climate Extremes Index, which is based on a smaller group of long-term weather stations that are tracked by the National Centers for Environmental Information and referred to as the U.

Historical Climatology Network. Figures 3 and 4 use data from a somewhat larger set of stations tracked by the National Centers for Environmental Information, known as the Global Historical Climatology Network. Figure 5 uses National Weather Service data processed by Meehl et al. Saha, M. Hawkins, D. Mills, J. Hess, R. Horton, P. Kinney, J. Schwartz, and A. Chapter 2: Temperature-related death and illness. In: The impacts of climate change on human health in the United States: A scientific assessment.

Global Change Research Program. Wuebbles, D. Fahey, K. Hibbard, D. Dokken, B. Stewart, and T. Maycock eds. Climate change The physical science basis.

Climate Extremes Index. Accessed March