NATCHEZ — Felt like that grand Mississippi summer swelter hasn’t been so sweltering this year?

It hasn’t. Some days have been downright autumnal, and though the National Weather Service doesn’t have an official climate site in Natchez, three western Mississippi cities — Vicksburg, Greenville and Greenwood — are set to have their coolest July on record.

According to the Weather Underground’s Weather Almanac, Natchez set a new record low temperature for Wednesday’s date, breezing past the 1984 record of 65 degrees to a chilly 62 for July 30. The average temperatures for that date are lows of 72 and highs of 91.

All six official NWS climate sites in Mississippi — Jackson, Meridian and Hattiesburg joining Vicksburg, Greenville and Greenwood — likewise set new record low temperatures Wednesday. The Greenwood, Greenville, Hattiesburg and Vicksburg records had stood since 1994, while the Jackson and Meridian lows rewrote records set in 1897.

National Weather Service Meteorologist Anna Webber said the cool temperatures could be attributed to high pressure in the upper atmosphere over the southwestern United States.

“The ridge of that kind of digs down just to our west, and to the east side of that you have the cooler air coming down from the north,” Webber said. “It is lined up to bring that cool air down to us.”

And while the cooler summer days are unusual, most folks aren’t complaining.

Adams County resident Barney McCallister usually has to wear long sleeves at his work — even in the summer — and the respite from the heat has been very noticeable, he said.

“It has been truly nice,” McCallister said. “I work out in the oilfield, and this morning I could tell a big difference — I was kind of glad to be wearing that (sleeves).”

When he’s not working in the oilfield, McCallister has a garden he likes to work at home, and the respite from the heat has been nice but hasn’t affected his plants production, he said.

One thing has been different this July, though.

“This season has been different on the insects in the garden,” McCallister said. “They haven’t been as bad as they usually are. We usually have those insects very early, and we haven’t had to deal with them much this summer.”

Webber said cool temperatures should last for a few more days, but  no one knows if the record-cool July will turn into a record-cool August.

“Through the weekend it is supposed to be below normal temperatures, but beyond that the models get really iffy,” she said.

Mississippi hasn’t had a 100-degree day since September 2012, Webber said.

“Looking at this year, we probably won’t hit it this year at this point,” she said.