Over the next week, much of the United States will experience temperatures of 95 degrees or higher and the weather will be “miserably hot and humid,” the National Weather Service is warning. This latest heat wave is expected to stretch from the Midwest through the Northeast, putting more than 70 million people under heat watches, warnings and advisories.

In addition to daytime temperatures in the triple digits, dozens of locations are expected to experience record-high overnight temperatures, which can be especially dangerous because they put a person’s body under extra strain as the heart pumps harder to try to regulate the body’s temperature.

If you feel like heat waves are becoming more common, you’re not imagining things. According to new research from the U.S. Global Change Research Program, major cities in the U.S. experienced an average of two heat waves per year in the 1960s, and they’ve been hit with an average of six heat waves per year in the 2010s. Not only are heat waves occurring more frequently, but heat wave season is also lasting longer. Across the 50 major cities the research program analyzed, the average heat wave time period lasted 45 days longer in the 2010s than in the 1960s.

Do you think your city has been heating up? Keep reading to see how heat waves have changed in frequency and length in the 45 major American cities that were affected in both ways.

## Albany, New York

**Increase in the number of heat waves per year:**2 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Albuquerque, New Mexico

**Increase in the number of heat waves per year:**2 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Allentown, Pennsylvania

**Increase in the number of heat waves per year:**2 or fewer heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Atlanta

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Austin, Texas

**Increase in the number of heat waves per year:**7 or 8 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Baltimore

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Birmingham, Alabama

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Boston

**Increase in the number of heat waves per year:**Not statistically significant**Increase in the length of the heat wave season:**21-40 days longer

## Buffalo, New York

**Increase in the number of heat waves per year:**2 or fewer heat waves**Increase in the length of the heat wave season:**Not statistically significant

## Charlotte, North Carolina

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Chicago

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Cincinnati

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Cleveland

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Columbus, Ohio

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

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## Dallas

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Detroit

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Fresno, California

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Hartford, Connecticut

**Increase in the number of heat waves per year:**Not statistically significant**Increase in the length of the heat wave season:**21-40 days longer

## Knoxville, Tennessee

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Las Vegas

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Los Angeles

**Increase in the number of heat waves per year:**Not statistically significant**Increase in the length of the heat wave season:**21-40 days longer

## Louisville, Kentucky

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Memphis, Tennessee

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Miami

**Increase in the number of heat waves per year:**More than 8 heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Milwaukee

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Nashville, Tennessee

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## New Orleans

**Increase in the number of heat waves per year:**More than 8 heat waves**Increase in the length of the heat wave season:**More than 80 days longer

## Oklahoma City

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Philadelphia

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Phoenix

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Pittsburgh

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Portland, Oregon

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Providence, Rhode Island

**Increase in the number of heat waves per year:**2 or fewer heat waves**Increase in the length of the heat wave season:**21-40 days longer

## Raleigh, North Carolina

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Richmond, Virginia

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Salt Lake City

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## San Antonio

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**21-40 days longer

## San Francisco

**Increase in the number of heat waves per year:**7 or 8 more heat waves**Increase in the length of the heat wave season:**More than 80 days longer

## San Juan, Puerto Rico

**Increase in the number of heat waves per year:**More than 8 heat waves**Increase in the length of the heat wave season:**More than 80 days longer

## Seattle

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## St. Louis

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Tampa, Florida

**Increase in the number of heat waves per year:**7 or 8 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

## Tucson, Arizona

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Tulsa, Oklahoma

**Increase in the number of heat waves per year:**3 or 4 more heat waves**Increase in the length of the heat wave season:**41-60 days longer

## Virginia Beach, Virginia

**Increase in the number of heat waves per year:**5 or 6 more heat waves**Increase in the length of the heat wave season:**61-80 days longer

Click through to find out how you can prep your home for natural disasters.

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*Methodology: Data was sourced from the U.S. Global Change Research Program. Heat waves were analyzed from 1961 to 2017 for 50 large U.S. metropolitan areas in terms of (1) changes in the number of heat waves per year (frequency) and (2) the number of days between the first and last heat wave of the year (season length). The data focuses on the 50 most populous U.S. metropolitan areas that have available weather data from a consistent location, hence why major cities including Houston and New York were not included.*

This article originally appeared on GOBankingRates.com: Heat Waves Are Getting Worse in These 45 Cities