Coolest US Cities in Summer
Cool summer temperatures can be found in major cities across the continental United States. Among the country's 40 largest cities, San Francisco tops the list for usually having the coldest weather each day in June, July and August.
| City | Daily Summer Mean °F |
|---|---|
| San Francisco, California | 61.4 |
| Seattle, Washington | 64.2 |
| Portland, Oregon | 66.4 |
| Milwaukee, Wisconsin | 69.6 |
| Cleveland, Ohio | 69.9 |
| San Diego, California | 70.3 |
| Denver, Colorado | 70.9 |
| Chicago, Illinois | 71.1 |
| Boston, Massachusetts | 71.4 |
| Detroit, Michigan | 71.4 |
| Long Beach, California | 72.9 |
Coolest Summer Days
Every major US city has set a record high temperature of 100 °F (37.8 °C) or more. However, eleven of the biggest American cities don't reach temperatures above 82 °F (27.8 °C) during an average summer day.
| City | Average Daily Maximum °F |
|---|---|
| San Francisco, California | 68.4 |
| Seattle, Washington | 73.0 |
| San Diego, California | 75.2 |
| Portland, Oregon | 77.2 |
| Milwaukee, Wisconsin | 78.8 |
| Cleveland, Ohio | 79.3 |
| Boston, Massachusetts | 79.6 |
| Detroit, Michigan | 81.3 |
| Chicago, Illinois | 81.3 |
| New York, New York | 81.9 |
| Long Beach, California | 81.9 |
Lowest Summer Temperatures
Only two large US cities have experienced freezing temperatures during summer. Denver, Colorado and Cleveland, Ohio have record June lows of 30 °F and 31 °F respectively. Temperatures in nine of the 40 major American cities drop below 62 °F (16.7 °C) on a daily basis, on average, during the summer.
| City | Average Daily Minimum °F |
|---|---|
| San Francisco, California | 54.4 |
| Seattle, Washington | 55.4 |
| Portland, Oregon | 55.6 |
| Denver, Colorado | 56.4 |
| Sacramento, California | 57.3 |
| Cleveland, Ohio | 60.4 |
| Milwaukee, Wisconsin | 60.4 |
| Chicago, Illinois | 60.9 |
| Detroit, Michigan | 61.6 |
