The first day of spring was only a few days ago, but this week, in parts of the West, it already feels like summer.

Those donning winter sweaters last week were in sleeveless shirts Tuesday in places like San Francisco, Los Angeles and Phoenix, where temperatures were 10 to 20 degrees above average for this time of the year.

Phoenix hit 99 degrees just after 2 p.m., breaking the same-day record of 96 degrees. Palm Springs hit 100 degrees at 2:20 p.m., surpassing the previous 97-degree high reached in 1988.

These records were unofficial as of the afternoon and were to be formalized later in the day.

More than 48 weather reporting locations from Houston to Seattle had the chance to tie or break daily high-temperature records Tuesday as unseasonably hot weather settled in for a second day. It was a dramatic turn from the start of the month, according to Alicia Ryan, a meteorologist with the National Weather Service in Phoenix.

“Just two-ish weeks ago, we had system after system bringing colder temperatures,” she said.

— The New York Times