Planting annuals? Be prepared for two more sub-freezing mornings in Treasure Valley

April 23, 2013 

Boise came close to tying a record low Tuesday morning, when temperatures dipped down to 26 between 5 a.m. and 6 a.m., according to the National Weather Service. The record was 25 in 1992.

Temperatures in the Mountain Home area this morning ranged from 19 to 29. On the west side of the Valley: Kuna, 23; Eagle, 30; Nampa, 27; and Caldwell, 28.

"It was so dry, there wasn't much frost," said Joel Tannenholz, a meteorologist at the National Weather Service in Boise.

Valley gardeners should prepare for a repeat the next two mornings — possibly cover annuals if they're already in the ground — though temperatures aren't expected to go quite as low. Boise won't see sub-freezing temperatures Wednesday, but Mountain Home will.

A cold air mass out of British Columbia cooled the Valley down yesterday, and clear skies contributed to sub-freezing temperatures. Today the forecast shows warm winds from the west, followed by another cold air mass out of British Columbia.

The high today in Boise will be in the mid-50s, about 8 degrees below normal. But it's going to warm up before week's end — 60s on Wednesday and Thursday, and low-70s on Friday and Saturday. Most of the week will be sunny, and winds will be moderate, ranging from 10 to 15 mph most days.

Here's a list of Southwest Idaho freeze dates for spring and fall.

Katy Moeller: 377-6413

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