Lake Erie is the Greatlake that has the warmest water tempature!
The Southwest and Southeast are the warmest regions in the US. However, out of the four regions defined by the census bureau, the West and South would have to be the warmest.
It is warmest in the southwestern deserts and Hawaii, especially during summer months.
The Pacific
The warmest city in the US to visit in December is typically Miami, Florida, with average temperatures ranging from 60-77F.
The best safest and warmest city in the US is the city of Scottsdale, Arizona. In second place is the city of Plano, Texas.
Equator.
Hawaii
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In the United States, the states that typically experience the warmest temperatures in January are Hawaii and Florida.
Mesa and Gilbert are the warmest and driest cities in the winter in the United States. Generally the warmest and driest state during winter in the United States is Arizona.
Ocean water generally gets warmer toward the equator and cooler toward the poles. However, the warmest water is not usually observed directly on the equator itself.