If it feels like summer never left, the numbers back you up. This week brought a fresh wave of record-breaking heat across the country, even as calendars flip toward Halloween.

How hot has it been?

In a word: hot.

According to U.S. National Climatic Data Center (NCDC), we have seen more than 600 daily high records tied or broken in the past week, primarily across the central and eastern U.S.

Another 700 daily warm low records were tied or broken as well, so there was little relief when the sun went down.

(MORE: These cities will see the biggest temperature drops)

St. Louis nearly tied its all-time October heat record, hitting 93 degrees at Lambert International Airport. Its all-time record is 94 degrees, set back in 1953. The 93 degrees did shatter a daily record that had been in place for over 100 years, dating back to 1899.

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The Twin Cities saw back-to-back record days, reaching 90 on Oct. 10 and 11 and running more than 20 degrees above the historical average.

Denver has seen its longest streak of 80-plus-degree days in October since record-keeping began.

And this record warmth follows an impressive heat wave that hit the West to start the month.

Downtown Los Angeles has seen five days above 100 so far this month. This has never happened in October. The previous record was four 100-degree days in October 1958 and 1971.

These 100-degree days were all in a row as well, occurring Oct. 2-6. This ties the third-longest stretch of consecutive days above 100 degrees.

For downtown Los Angeles, this has been its hottest June 1 to Oct. 4 of all-time.

Not just October

This week's heat isn't an isolated blip. It's capping an extraordinary year.

NOAA reports that the period from January through September was the warmest on record for the contiguous U.S. in 132 years of data — driven partly by the hottest September ever recorded nationally.

Eight states, including Oklahoma, Missouri, Kansas, Texas and Illinois, posted their warmest Septembers on record, per the National Centers for Environmental Information, with some beating marks that dated back to the Dust Bowl era of the 1930s. 

Notably, much of this record warmth has come from unusually warm overnight lows rather than scorching daytime highs, with an estimated 80 million Americans experiencing their warmest September nights on record.

With the U.S. now on pace for its hottest year ever measured, this week's heat is less of a fluke and more of a continuation of a trend that's been building all year.