IRON MOUNTAIN — Cooler air might prevail for another week or so, but a National Weather Service outlook favors temperatures rising above average this summer.

“Enhanced probability of above normal temperature persists through July-August-September across much of the continental United States,” forecaster Johnna Infanti said.

La Nina conditions are expected to continue, according to the Climate Prediction Center. La Nina is the periodic cooling of the central Pacific Ocean that affects weather patterns around the globe.

For the Upper Peninsula, the CPC sees a 45% chance of warmer-than-average weather through September, and just a 22% chance of below-normal.

The precipitation outlook for summer is normal. The U.S. Drought Monitor shows no areas of concern in northeastern Wisconsin and the Upper Peninsula, apart from the far eastern U.P.

Accuweather, meanwhile, sees a moderate risk of severe weather in the region throughout the summer.

Locally, most days in May were cool.

Summer officially arrives at 5:13 a.m. Tuesday, June 21, as astronomers look forward to a unique alignment of five planets.

“Mercury, Venus, Mars, Jupiter and Saturn will appear in order in the pre-dawn sky throughout the second half of June,” Accuweather meteorologist Brian Lada said. “Friday, June 24, could be the best morning to view the alignment as the crescent moon will appear to fall in line directly between Venus and Mars.”

The planets can be seen with the naked eye, though Mercury will be the dimmest and the lowest in the sky. The planetary procession can best be seen about an hour before sunrise and won’t be repeated until August 2040.