More Warm Nights Across the U.S.

Our study analyzed the number of nights each year when the temperature remained above 65°F (for cities that rarely experience nights above 65°F, we chose 55°F), which is an engineering temperature standard for keeping buildings cool. In our analysis of 244 cities across the U.S., we found that 87 percent are having more of these warm nights since

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2018 Global Heat So Far

Globally, the past four years have been the hottest four years on record, and 2018 so far is coming in as the 4th hottest. All-time record heat has peppered the Northern Hemisphere this summer. Here a few stats compiled by Weather Underground: Glasgow, Scotland had its hottest day on record, reaching 89°F on June 28. Montreal, Canada set a new

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Summer Days Are Getting Hotter

The summer solstice occurs at 6:07 a.m. EDT on June 21, marking the beginning of astronomical summer in the northern hemisphere. Meteorological summer, which consists of the three hottest climatological months of the year, started on June 1. No matter how you look at summer, it is the season with the most obvious climate change impact — extreme

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Cooling Demand is Increasing in the U.S.

CDDs do not actually measure days at all. Rather, they measure the number of degrees that the daily average temperature is above 65°F. So if the average temperature for a day is 80°F, there were 15 CDDs in that day. Some of the largest increases in CDDs are also seen in the Southwest, however CDDs are increasing sharply in places that traditionally

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u.s. temperature rankings in 2018

2018 U.S. Temps: State Rankings Through June

Despite a cold April, 2018 is the 14th warmest year on record so far in the U.S. Halfway through the year, Arizona and New Mexico are record hot, and the remaining southwestern states are each having one of their 10 hottest years. In fact, the four hottest years in the U.S. have all come in the decade of the 2010s. July has been a scorcher from

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global heat so far in 2018

2018 Global Heat So Far

Globally, the past four years have been the hottest four years on record, and 2018 so far is coming in as the 4th hottest. All-time record heat has peppered the Northern Hemisphere this summer. Here a few stats compiled by Weather Underground: Glasgow, Scotland had its hottest day on record, reaching 89°F on June 28. Montreal, Canada set a new

more
warm summer nights

More Warm Nights Across the U.S.

Our study analyzed the number of nights each year when the temperature remained above 65°F (for cities that rarely experience nights above 65°F, we chose 55°F), which is an engineering temperature standard for keeping buildings cool. In our analysis of 244 cities across the U.S., we found that 87 percent are having more of these warm nights since

more
cooling demand

Cooling Demand is Increasing in the U.S.

CDDs do not actually measure days at all. Rather, they measure the number of degrees that the daily average temperature is above 65°F. So if the average temperature for a day is 80°F, there were 15 CDDs in that day. Some of the largest increases in CDDs are also seen in the Southwest, however CDDs are increasing sharply in places that traditionally

more
hot summer days

Summer Days Are Getting Hotter

The summer solstice occurs at 6:07 a.m. EDT on June 21, marking the beginning of astronomical summer in the northern hemisphere. Meteorological summer, which consists of the three hottest climatological months of the year, started on June 1. No matter how you look at summer, it is the season with the most obvious climate change impact — extreme

more
Golf courses are adapting to climate change

Climate Change on the Golf Course

Father’s Day and the U.S. Open are reminders that golf is a big economic driver. One trade study indicated that golf contributes more than $80 billion a year to the U.S. economy. And while golfers are infamous for playing in less-than-ideal conditions, extremes like heat, drought, and heavy rain that come with climate change are impacting the game

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ocean circulation impacts

Global Conveyer Belt: Ocean Current Slowing

June 8 is World Oceans Day, a time to raise awareness about the importance of the oceans to our planet. Ocean currents and broader circulations move vast amounts of water around the world, redistributing heat and energy, and helping regulate the global climate. Wind-driven currents like the cold California Current and the warm Gulf Stream are

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climate change and rapidly intensifying hurricanes

Climate Change and Rapidly Intensifying Hurricanes

Atlantic hurricane season starts June 1, and last year’s season was devastating for the U.S. Damage from Hurricanes Harvey, Irma, and Maria cost the U.S. $267 billion. All three hurricanes went through a rapid intensification (RI) cycle, meaning the strongest winds within the storm increased by at least 30 knots (about 35 mph) in 24 hours. Harvey

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Drought and deluge in a warming world

Drought & Deluge in 2018

In a warming world, a supercharged water cycle ramps up evaporation and precipitation. Warmer air creates higher evaporation rates from the soil, which worsens drought, stresses water supplies, and hampers agriculture. Evaporation of surface waters, such as lakes and oceans, also increases. A warmer atmosphere can hold more water before becoming sa

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30-year temperature average in the U.S.

New Normal: Temperatures Are Trending Up Across U.S.

Normal temperatures, generally defined to be the 30-year average at a location, are trending up across most of the U.S. Since 1980, the average continental U.S. temperature has risen 1.4°F. In our analysis of normal temperatures in 244 cities across the country, 94 percent have risen, providing more evidence of the long-term warming trend on our

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change in days with heavy precip

Heavy Rainfall Trends Across the U.S.

With flooding in parts of the Mississippi Valley and a strong Pacific storm coming into the Northwest, we examined the trend in the number of days each year with heavy precipitation at 244 individual sites in the U.S. This expands our nationwide-averaged heavy precipitation analysis from earlier this year, complementing the 2017 Climate Science

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allergy season and climate change

Here’s How Frost-Free Season Affects Allergy Season

Pollen allergies are not just a nuisance. Asthma symptoms can be triggered by exposure to pollen, with the number of emergency room visits increasing on days with high pollen. An analysis of emergency room visits in New York City during 1999 showed peaks in the number of visits correlated with high spring pollen counts, and is consistent with other

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