On August 14th, Phoenix Sky Habor reached a sweltering high temperature of 117º. This not only tied the record high for the day but also brought the number of 115º+ days so far this year to 8. The record number of 115º+ days in a year was 7, set back in 1974, so we have indeed passed that.

And if you are keeping track, we are now at 38 days at or above 110º this year, which smashes the old record of 33 set back in 2011.

Believe it or not, we are now past the halfway point when it comes to Monsoon 2020. So far this season (June 15th - August 12th), Phoenix Sky Harbor has measured a meager 0.10" of rain. This year now ranks as the second driest monsoon during this period, with the record driest going to 1995, when no rain fell until August 14th!

With the first half of the season being so dry, could we see a wet end to the season? Let's go to the data!

Back in 1995, at this same time, we had no rain; however, from August 13th - September 30th, an additional 7 days of rain was recorded with the monsoon total ending up at 4.58", which is well above the average of 2.71". So just because we start dry, we don't have to end dry!

Now, before you get too excited, let's look at the averages from the top 20 driest monsoons (June 15th - August 12th). On average, there are six days of rain between August 13th and September 30th, resulting in an additional 1.56" of rain. Using this average, it would leave Monsoon 2020 in Phoenix at 1.66", which is over an inch below the average.

Looking at the worst possible situation, no rain has fallen during the last half of monsoon in 1973 and 1945, which would leave Phoenix as 0.10". This would undoubtedly break the record for the driest monsoon on record.

On the flip side, in 2014, Phoenix received 5.84" of rain in the last half of monsoon, with 3.3" falling in just one day as moisture from a tropical system moved into the region.

So while odds are certainly leaning toward a dry end to Monsoon 2020, don't let your guard down thinking there will be no more storms in the Valley of the Sun. There are some indications that tropical activity in the East Pacific could increase later this month into September, which could help to bring plenty of moisture to the state. After all, it really only takes one good storm to get us right back to average or even above average.

Keep thinking rain!

Feeling hot? You are not alone!

On August 9th, Phoenix Sky Harbor broke the 110º mark for the 34th time so far this year! This breaks the old record of 33 days, which was set in 2011. The average number of 110º+ days stands at 19.

Keep in mind, the Valley of the Sun broke this record on Aug 9th and the average last 110º+ day is not until August 26th, so still plenty of time to rack up more very hot days. In fact, looking at the current forecast, the tally this year could be at 40 days by the end of next weekend.

Stay cool!

No getting around it, the Valley of the Sun has been incredibly hot this week. In fact, the high temperature at Phoenix Sky Harbor has been 115º+ for the past four days (July 28th-31st).

This ties the record for the longest streak of days at or above 115º, which has only happened four other times since records began.

June 19-22, 1968

June 25-28, 1976

June 25-28, 1990

July 26-29, 1995

The high temperature at Phoenix Sky Harbor at 4:40 pm on July 30th hit a sweltering 118º. This broke the record high for the day of 115º, set all the way back in 1934. But this was not the only record broken.

This will now go down as the latest day in a year with a high temperature of 118º+. The old record was July 28th set in 1995.

And yes, having a high temperature of 118º is very rare. In fact, since records began in 1896, the high temperature has only been 118º+ a total of 18 times!

Since 2008, the monsoon has had fixed start and end dates of June 15th to September 30th. Before these dates were established, the monsoon was defined to have started in Phoenix when the daily average dew point was 55º or higher for three consecutive days.

Over the past three days (July 22nd-24th), Phoenix has recorded a daily average dew point of 55º or higher, so Monsoon 2020 started using the dew point method on July 22nd! The earliest start date was on June 16, 1925 and the latest occurred on July 25, 1987. On average, the start is around July 7th.

Even though this rule is not the "official" way to determine the start of the season, I still like to track it!

Monsoon storms finally moved over Phoenix Sky Harbor just before 7 pm on July 24th, producing 0.10" of rain, breaking the 103 day long dry streak! The last time measurable rain fell at Sky Harbor was April 11th!

So far this year, 3.65" of rain has fallen, which is below the year-to-date average of 3.95".

The radar image above shows how close the storm came from missing the rain gauge at the airport, marked with the red box.

*****NOTE: The temperature after this post was written dropped to 86º at 11:59pm. This means the difference in high/low for the day was 12º, which has happened 1,262 times. Not nearly as impressive as only 297 times.***

If you are looking for a dose of random weather facts, you have come to the right place. Today it's all about the high and low temperature difference! And there is one fact that I think weather nerd or not, you will find interesting!

The high temperature at Phoenix Sky Harbor on July 23, 2020, was 98º, with a low of 90º. That's a difference of just 8º. Having a temperature range that small has only occurred 297 times since records began in 1896. In other words, in 45,494 days of weather records, it has only happened on 0.65% of the days!

Ok, now to the very strange part!

Having an 8º difference has only happened five times in July since records began. Ok, great, not that exciting... well, just wait... out of those five times, three have occurred on July 23rd! Very interesting, don't you think? Slim odds of that happening!

Just in case you were wondering, the largest difference in high and low temperature comes in at 48º, which has occurred twice. On June 13, 1917, the high temperature was 107º with a low of 59º. On April 17, 1919, the high was 96º with a low of 48º!

The smallest difference occurred on February 7, 1941 with a high of 52º and a low of 50, just a two-degree difference!

There you have it, your daily dose of useless weather facts! You may now return to your regularly scheduled programming!