TEMPERATURES

Overall, July started off fairly close to normal through the first 11 days, with some pretty chilly mornings, mostly in the low-to-mid 50s, even dropping to 47.1° on the 3rd for the month’s lowest temperature. The heat quickly took over on the 12th, bringing 6 consecutive days with Maximums ≥90°. Fortunately, due to the cloudless skies and dry air, Minimums dropped into the 50s to low 60s each day bringing respite from the daytime heat. A few cool days followed (daytime 70s, nighttime upper 40s) but then even more extended heat enveloped the area when 10-consecutive days reached ≥90°, peaking at 97.9° on the 29th. All-in-all, 16 days recorded Max. Temps. ≥90°. The Portland Airport (PDX) set its all-time record with 15 such days (period-of-record back to Nov. 1940), also setting the long-term historical record when including official downtown data back to 1871.

Comparing two specific periods in this month, the following Max/Min/Mean Temperatures were observed here in Happy Valley: 1st-11th, 79.3°/54.7°/67.0°; 22nd-31st, 93.4°/58.1°/75.8°. The Heat Index peaked at 104° on the 29th, the only such day to reach ≥100°. The monthly diurnal range was nearly 30°; the maximum daily range was 40.1° (22nd), the minimum was 10.9° (9th).

 

 

A nearly rainless month occurred as only a single day of rain was observed; this 0.03” amount is also the total for 44-consecutive days (starting with June 18th) to end this month. Though this July was very dry, it did exceed July 2017 when only a Trace fell the entire month.

 

 

Link to the monthly Weather Form:  Happy Valley Weather: July 2018

 

Cover Photo: Cascade Sunset with Full Moon, 7/25/2018, 2039 Hrs.  

Below Image: Mt. Hood Sunset, 7/25/2018, 2032 Hrs.