Flood Watch
from FRI 11:00 AM MST until SAT 11:00 PM MST, Yavapai County Mountains, Little Colorado River Valley in Coconino County, Little Colorado River Valley in Navajo County, Little Colorado River Valley in Apache County, Eastern Mogollon Rim, White Mountains, Northern Gila County, Yavapai County Valleys and Basins, Oak Creek and Sycamore Canyons, Western Pima County including Ajo/Organ Pipe Cactus National Monument, Tohono O'odham Nation including Sells, Upper Santa Cruz River and Altar Valleys including Nogales, Tucson Metro Area including Tucson/Green Valley/Marana/Vail, South Central Pinal County including Eloy/Picacho Peak State Park, Southeast Pinal County including Kearny/Mammoth/Oracle, Upper San Pedro River Valley including Sierra Vista/Benson, Eastern Cochise County below 5000 ft including Douglas/Wilcox, Upper Gila River and Aravaipa Valleys including Clifton/Safford, White Mountains of Graham and Greenlee Counties including Hannagan Meadow, Galiuro and Pinaleno Mountains including Mount Graham, Chiricahua Mountains including Chiricahua National Monument, Dragoon/Mule/Huachuca and Santa Rita Mountains including Bisbee/Canelo Hills/Madera Canyon, Santa Catalina and Rincon Mountains including Mount Lemmon/Summerhaven, Baboquivari Mountains including Kitt Peak, Kofa, Central La Paz, Aguila Valley, Southeast Yuma County, Gila River Valley, Northwest Valley, Tonopah Desert, Gila Bend, Buckeye/Avondale, Cave Creek/New River, Deer Valley, Central Phoenix, North Phoenix/Glendale, New River Mesa, Scottsdale/Paradise Valley, Rio Verde/Salt River, East Valley, Fountain Hills/East Mesa, South Mountain/Ahwatukee, Southeast Valley/Queen Creek, Superior, Northwest Pinal County, West Pinal County, Apache Junction/Gold Canyon, Tonto Basin, Mazatzal Mountains, Pinal/Superstition Mountains, Sonoran Desert Natl Monument, San Carlos, Dripping Springs, Globe/Miami, Southeast Gila County

It's all downhill from here? US reaches average peak of summer temperatures

The average date summer generally peaks in the U.S. (Brian Brettschneider)

The march toward winter has begun. At least, temperature-wise…

Alaska climatologist Brian Brettschneider has computed the average peak of summer temperatures across the Lower 48 using 1991-2020 climate averages and found the period from July 24-25 is when the nation as a whole is at its hottest.

After much of the nation has been sweltering for the past several weeks, this might be good news, but for some areas, the hottest weather is generally yet to come, and the wait continues.

WHY SUMMER SHOULD ACTUALLY BEGIN ON JUNE 1

For much of Texas and especially central and southern Texas, the peak of the heat doesn't arrive until early August, as is the case in southern Florida. Houston, San Antonio, and Miami don't see their peak of summer until after Aug. 5.

That is also the case along the California coastline, where Santa Ana winds usually bring their hottest temperatures of the year in September and October.  

WHAT ARE THE SANTA ANA AND DIABLO WINDS?

Hawaii usually doesn't peak until Aug. 23, Brettschneider found.

On the other hand, across parts of the Great Lakes and desert Southwest, summer peaked days to weeks ago.  Parts of the western Texas Panhandle usually see their hottest weather before July even begins!

Get updates to this story on FOXWeather.com.