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[a] The all-time lowest recorded temperature in Phoenix was 16 °F (−9 °C) on January 7, 1913, while the coldest daily high temperature ever recorded was 36 °F (2 °C) on December 10, 1898. The longest continuous stretch without a day of frost in Phoenix was nearly eight years, from December 27, 1990, to December 23, 1998. [6]
At the same time, as the air descends from higher elevation to lower, the temperature and barometric pressure increase adiabatically, warming about 5 °F for each 1,000 feet it descends (1 °C for each 100 m). [12] Relative humidity decreases with the increasing temperature.
Good morning, Chicago. The week is going to close out hot and humid. Temperatures will reach the high 90s today and tomorrow, but the high humidity will make it feel hotter than what the ...
89% Humidity. 29.97 in Pressure--UV Index. 5:23PM Sunset. ... USA TODAY 18 minutes ago 8 dead, 1,000 rescued from Kentucky flooding as extreme weather sweeps nation; more to come.
The Phoenix–Mesa combined statistical area (CSA) was designated in September 2018 by U.S. Office of Management and Budget (OMB) and by the Census Bureau which consists of the entirety of the counties of Maricopa, Pinal, and Gila. [8] This includes the Phoenix metropolitan area and the Payson, AZ micropolitan statistical area.
It seems hard to believe this could happen today. Phoenix just had its hottest year on record in 2024, and had back-to-back record hottest summers in 2023 and 2024.
For example, according to the heat index, a relative humidity of 75% at air temperature of 80.0 °F (26.7 °C) would feel like 83.6 ± 1.3 °F (28.7 ± 0.7 °C). [13] [14] Relative humidity is also a key metric used to evaluate when it is appropriate to install flooring over a concrete slab. [clarification needed]
This approach is accurate to within about ±1 °C as long as the relative humidity is above 50%: ; (); This can be expressed as a simple rule of thumb: For every 1 °C difference in the dew point and dry bulb temperatures, the relative humidity decreases by 5%, starting with RH = 100% when the dew point equals the dry bulb temperature.