July 2019 Summary

July was fairly mild and wet/stormy, with slightly below average temperatures and slightly above average precipitation. It was also a bit more stable than usual without any of the real summer heatwaves we often get, with the typical pattern through most of the month being a couple of warm days sandwiched between stable cooler-than-usual conditions. This the mildest July that I've experienced here in a long time, there have been one or two that were milder than this in recent years but I was living in Vancouver during those ones and didn't experience them firsthand.

Sunshine stats are not in yet but I expect that, like June, it will be slightly below average. We had a fairly wet month with some pretty epic storms and higher humidity than usual (which surely contributed to the stability and mildness of the month).

Stats:

Average high: 24.4C (normal: 25.3C)
Average low: 11.3C (normal: 11.6C)

Highest high: 30.5C (July 23rd)
Highest low: 16.4C (July 7th)

Lowest high: 16.3C (July 25th)
Lowest low: 5.1C (July 2nd)

Precipitation: 67.6mm (normal: 60.3mm)
Precipitation days: 15 (normal: 11)

Wettest day: 19.2mm (July 24th)

July 2019 Summary Phoenix, AZ

Highest Temp 46.1°C
Lowest Temp 24.4°C
Minimum High 36.1°C
Maximum Low 33.9°C

Avg High 42.3°C Dep +0.6°C
Avg Low 29.5°C Dep -0.2°C

Mean Temp 35.9°C Dep +0.2°C

Total Rainfall 4.32 mm
Departure -21.08 mm

Records=2

I. 12th Record Max Low (Tie 2009)
32.8°C Dep +2.8°C
II. 27th Record Max Low (Tie 2018)
33.9°C Dep +4.5°C

Five Warmest Days

I. 27th 39.4°C (45°C/33.9°C)
II. 16th 38.9°C (46.1°C/31.7°C)
III. 11th 38.9°C (45.6°C/32.2°C)
IV. 15th 38.6°C (45.6°C/31.7°C)
V. 12th 38.6°C (44.4°C/32.8°C)

Five Coolest Days

I. 31st 30.3°C (36.1°C/24.4°C)
IItie. 8th 32.5°C (40.6°C/24.4°C)
IItie. 9th 32.5°C (40.6°C/24.4°C)
IV. 24th 32.8°C (38.9°C/26.7°C)
V. 30th 33.1°C (41.7°C/24.4°C)

Despite being just 0.2°C above average, this tied for our 6th warmest July on record

Average high: 83.9 (+2.9)
Average low:  64.3 (+3.6)
Mean:            74.1 (+3.3)

Precipitation: 2.64” (-0.69”, 79%)
Precipitation days: 6

Highest temp: 92 on the 16th and 20th
Lowest temp: 53 on the 8th
Highest min:  75 on the 20th
Lowest max:  72 on the 22nd

Highest dew: 77 on the 19th

First half was wet, 2nd half was pretty dry—only 0.15” fell after the 17th.

It was the T-16th warmest July out of 148 which sounds impressive but was pathetic compared to farther east. Would have been a decent month except now it’s an infuriating case of what could have been.

Here’s the month:


And the year:

Juli 2019 väderöversikt för Pörtlånd flygplats





This July was a very mild summer month for PDX. After a cool start, the month warmed up significantly as it went on. While the average high was right around normal at 80.3ºF, the low was a very mild 60.3ºF - the sixth warmest on record. As a result, the month was considered warmer than average. Lowest temperature of the entire month was 55, which is incredibly mild - the average is about 51. This is tied for second warmest on record with 2004, 2005, and 2009.

However, this average low is influenced by UHI. Sometime soon, I will make an equivalent climate data for Hillsboro, which is out in the nearby Tualatin Valley and does not experience UHI, giving it much cooler lows than the PDX station. From August onward, both stations will be presented in the monthly summary.

Precipitation was technically above average thanks to a thunderstorm on July 1 that did not impact the entire metro area. Precipitation would be average to slightly below average discounting this thunderstorm.

Coolest high was 68.

A pretty radical shift.

This is the first dry month since September 2018. After the 10th, the tap just shut off.

The month would have been well below average if not for a brief, intense heatwave in the middle of it, during which lows approached 80F (and exceeded it at the downtown station).

On a more positive note, the month cooled and stabilized in a big way after the heat ended, and there are currently no days exceeding 88F in the 14-day forecast. And, humidity is staying down. August 2017 #2 coming?



Edit: Forgot to add the anomolies!

Average max: 87.7F, -0.6F
Mean: 77.8F, -0.5F
Average min: 67.9F, -0.5F

Precipitation: 2.49", -1.96"

Highest max: 97F, 19th/20th
Lowest max: 80F, 4th

Highest min: 79F, 19th
Lowest min: 57F, 23rd

Description: 1st to 16th was nearly tropical in its consistency and stability. 90/70 infinite loop. Then four days of heat, then a cooldown. The last ten days of the month had highs in the 80s (except for one day) and lows in the 60s, with low humidity. About as nice as July here can get. 

Haven’t October, January, February, and May been below the 1981-2010 average?

2nd wettest July on record. More than half the rain fell in one day (July 30 had 7.70" from a slow moving heavy t-storm). Also got some periods of heavy rainfall due to Hurricane Barry the middle of the month. Still a little disappointing t-storm-wise considering the amount and frequency of precip. Had heavy rainfall without much lightning a number of times. I'd guess there were 3 good t-storms overhead (there was quite a bit of lightning with the July 30 storm which lasted a couple of hours). 

A good bit cooler than normal (was 0.2F from making the top 10 coolest months). First half of the month was hotter than the second half. Had a few unusually cool days with lower than normal humidity July 23-26. 

Up to 49.24" of rain for the year now. 




Lowest max: 79F
Highest min: 77F

Max dewpoint: 79F
Min dewpoint: 59F
Avg dewpoint: 73F

Days with thunder: 11

Despite the hottest temperature recorded on the 25th, it was still a warm month yet not exactly the same level of the pertinacity of last year. No wonder why this July felt better in relatively speaking.