Saturday, September 30, 2023

Summer 2023: warmer and slightly drier than normal

 Meteorological summer consists of June, July, and August.  Summer 2023 was warmer and a bit drier than normal.

The mean temperature this past summer at Victoria Gonzales was 16.4 degrees, which is 0.7 degrees above the 30-year average.  Summer 2023 was tied for the 6th warmest in Victoria since record-keeping began at Gonzales Observatory in 1914.  Temperatures got warmer as the summer progressed: June was close to average, July was 0.5 degrees above normal, and August was 1.4 degrees above normal.  In fact, August's mean temperature of 17.8 C was the warmest on record at Victoria Gonzales.

The average daily high temperature this summer was 20.7 C (versus the normal of 20.0 C) while the average daily minimum was 12.0 C (normal 11.5 C).   

The chart below shows the daily maximum and minimum temperatures at Victoria Gonzales during summer 202
3, compared with the 30-year averages.  The first half of the summer had a mix of both below and above normal temperatures, while the second half of the summer saw mostly above normal temperatures.  The warmest temperature of the summer was 32.5 C on August 19th, which was also the 10th hottest August day ever recorded in Victoria.  It was the only day of the summer to exceed 30 C.    

The coolest temperature during the summer was 8.5 C on June 19th.

Daily Max & Min Temperatures in Victoria, Summer 2023

Victoria received 35.4 mm of rain from June to August, about three-quarters of its normal summer rainfall of 47 mm. While it was drier than normal, it was not usually so: summer 2023 was just the 41st driest summer in Victoria in the 125 years of record-keeping.  Just two days accounted for 70% of the summer's rainfall: June 10th (13.2 mm) and July 24th (11.4 mm).

Victoria had only 8 days with measurable rainfall this summer, compared with the normal 14.8 days.  There were 3 days with measurable rain (>0.2 mm) in June, 1 in July, and 4 in August.  


The chart below shows daily precipitation during summer 2023, and compares the cumulative precipitation with the 30-year average.   While rainfall was very sporadic, the cumulative rainfall generally kept fairly close to normal throughout the summer.

Daily & Cumulative Rainfall  in Victoria, Summer 2023



Summer 2023 sunnier than normal.  June and July were both sunnier than normal, while August was close to normal.  

The table below shows the number of mostly sunny days (>80% of possible sunshine), partly cloudy days (20-80% of possible sunshine), and mostly cloudy days (<20% of possible sunshine).  Summer 2023 was very sunny, with significantly more mostly sunny days than normal (62 in 2023 compared with the normal of 45 days).  There were also fewer mostly cloudy days than normal (10 days compared with the normal of 12).  July was a particularly sunny month.