BOISE, Idaho — Temperatures continue to sizzle into September. Saturday's high temp of 102° in Boise set a new record high temperature for the day; the previous record was set in 1931 and tied in 2007. This also takes the triple-digit tally up to 25 days for 2022, but from the looks of the KTVB 7 Day Forecast, that tally will likely continue to go up and more daily records are in jeopardy this week.
Saturday was also the second time Boise has hit 100° or hotter so far this September. The National Weather Service office in Boise sent out this tweet:
Looking at all of the weather records for Boise, dating back to 1875, temperatures of 100°+ in September have only occurred 15 times (including today, 9/3/2022). That is two times so far this year, as noted above, and twice in 2020.
It is really quite rare to see triple-digit temperatures going into September, with only a 10% chance of it happening one time each year; that probability turns into a 1% chance when it comes to more than 1 triple-digit day in September, but it's likely that we're in store for at least two more in the week ahead.
Here are some more stats when it comes to days of 100°, or hotter, in Boise:
- In any given year, the average last 100°+ day is around August 8th.
- The latest triple-digit day in any year on record is September 14th, 2000, when the high temp hit 101°.
- On September 4th, 2020, the temperature was 102°, making it the hottest temperature on record at the latest point in any year.
Boise did set a new record for the most days of 100°, or hotter, this year (25 days so far). However, the hottest summer on record is still 2021, with an average temperature of 78.1°.
The summer of 2022 went down in the record books as the second hottest summer on record for Boise, with an average temperature of 76.8°. This may seem like a bit of a head-scratcher — how have we seen so many hot days this year, but it's still in second place for "hottest summer on record?"
While the annual tally for triple-digit days continues to go up into September, meteorological summer is complete.
You may be thinking, "but summer isn't over yet!" Which is technically true, astronomically speaking. The autumnal equinox isn't until September 22nd, so it is still currently astronomical summer.
Astronomical seasons can change and fluctuate in the start, end and duration of the season from year to year. This is due to Earth's orbit being in an elliptical shape, which can cause the number of days in an astronomical season to change and the dates for solstices and equinoxes. It's because of that inconsistency in astronomical seasons, that meteorological seasons were created. For the purpose of streamlining the data, all meteorological seasons are a complete three-month period of the year.
- Meteorological summer: June, July and August
- Meteorological fall: September, October and November
- Meteorological winter: December, January and February
- Meteorological spring: March, April and May
That is to say, meteorological summer of 2022 is complete and in the books. Even though meteorological fall has begun, the annual tally of triple-digit temperatures continues to go up, and it looks like we may have more records on the way.
The forecast high in Boise for Tuesday (9/6) is 102°. The record for that day was set in 1955, at 98°. The forecast high for Wednesday (9/7) is 103°. The current record for that day is 97°, also set in 1955.
Not only is it looking likely that we'll see new daily high-temperature records this week, but it's likely we'll also see a few more mentionable records for Boise by week's end:
- The most triple-digit days in September
- The hottest temperature so late in the season, if Boise makes it to 102° on Tuesday it will be a new late heat record... then if Boise hits 103°, or hotter, on Wednesday it will break the record set the previous day.
- 2022 will end with at least 27 days of 100°, or hotter.
While it looks like temperatures will cool down by next weekend, will it stick? So much of the heat we've seen this year has been unprecedented, and it continues to be unprecedented as we sizzle into September.
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