You can worry with certainty about the hottest July on record — which already happened, just last month.

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Here are 9 things to know about the heat surge.

1 - NEW RECORD IS HOTTER BY A RELATIVELY LARGE MARGIN

July's average temperature was 61.86 degrees Fahrenheit, beating the previous global mark set in 1998 and 2010 by about one-seventh of a degree. That's a large margin for weather records, with previous monthly heat records broken by a 20th of a degree or less.

2 - EARTH KEEPS GETTING HOTTER

"It just reaffirms what we already know: that the Earth is warming," said climate scientist Jake Crouch of the National Oceanic and Atmospheric Administration (NOAA). "The warming is accelerating and we're really seeing it this year."

3 - WEATHER RECORDING AGENCIES AROUND THE WORLD AGREE

NOAA records go back to 1880. Separate calculations by NASA and the Japanese weather agency also found July 2015 to be a record.

4 -  HOTTEST JANUARY-TO-JULY SPAN ON RECORD

The first seven months of 2015 were the hottest January-to-July span on record, according to NOAA. The seven-month average temperature of 58.43 degrees is 1.53 degrees warmer than the 20th-century average and a sixth of a degree warmer than the old record set in 2010.

5 - JULY OCEAN TEMPS WERE 1.35 DEGREES WARMER THAN 20-CENTURY AVERAGE

The oceans drove the globe to record levels. Not only were the world's oceans the warmest they've been in July, but they were 1.35 degrees warmer than the 20th-century average.

6 - OCEANS STILL TRENDING WARMER, NOT COOLER

Given that the temperatures have already been so high already — especially the oceans, which are slow to cool — NOAA climate scientist Jessica Blunden said she is "99 percent certain" that 2015 will be the hottest on record for the globe. The oceans would have to cool dramatically to prevent it, and they are trending warmer, not cooler, she said.

7  - WARMING IS BOTH MANMADE AND NATURALLY AFFECTED BY EL NINO

Crouch, Blunden and other scientists outside of the government said these temperatures are caused by a combination of man-made climate change and a strong, near-record El Nino. An El Nino is a warming of the equatorial Pacific Ocean that alters weather worldwide for about a year.

8 - EUROPE AND MIDDLE EAST HIT HARD BY SUMMER HEAT

The heat hit hard in much of Europe and the Middle East. It was the hottest July on record in Austria, where records go back to 1767. Parts of France had temperatures that were on average 7 degrees above normal and temperatures broke 100 in the Netherlands, which is a rarity. And an Iranian city had a heat index (the "feels like" temperature) of 165 degrees, which was still not quite record.

9 - NINE OF 10 HOTTEST MONTHS EVER RECORDED WERE IN PAST DECADE

Nine of the 10 hottest months on record have happened since 2005, according to NOAA. Twenty-two of the 25 hottest months on record have occurred after the year 2000. The other three were in 1998 and 1997.

The Associated Press contributed to this report.