Mount Shasta’s National Weather Service observer Frank Christina said the 16 consecutive days he has recorded with high temperatures of 90 degrees or above is “unprecedented.”
A 17th day was being predicted for Friday, July 31, and possibly another on Saturday before a predicted cooling trend that may end the streak.
"This is one of the worst heat waves ever in Mount Shasta,” Christina said.
Temperatures throughout southern Siskiyou County have been similar, often slightly warmer in the surrounding towns of Dunsmuir, Weed and McCloud.
Christina, who only reads and records temperatures for the city of Mount Shasta, said he posted two record high temperatures earlier this week. The 100 degree high on Tuesday was one degree above the previous recorded high for that day, set on July 28, 1938.
When the temperature reached a high of 99 the following day, it became the hottest July 29 in the record book, which dates back more than 100 years. The previous high for July 29 was 98 in 2003.
As of July 30, Christina had recorded 20 days in the month with temperatures of 90 or above. The average number of days for an entire season with temperatures of 90 or above is 21.
The average high July temperature for the town is 85, according to Christina’s records.
The low daily temperatures have been above the historical average, too, Christina said. For the past week, the daily low temperatures have been between 55 and 57. The average daily low for July is 50.
Christina said one recent day it was still 71 degrees at 1:30 in the morning. "That's desert temperatures," he said.
August also has an average high temperature of 85, and current predictions for the first four days of August 2009 show 93, 88, 85, 82 and 82.
Christina said he was told by the National Weather Service that their 30 day outlook shows August 2009 temperatures expected to be similar to July 2009.
It’s been unusually hot throughout the Pacific Northwest this summer, including recent record breaking high temperatures of 103 on July 29 in Seattle, Wash., and 106 in Portland, Ore., on July 28, which was one degree shy of the all-time record for any day in that city.