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September 2012 climate report for Tucson Arizona
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September/Monsoon 2012 climate report for Tucson

Headlines
29th warmest and 30th driest September on record
9th HOTTEST and 53rd wettest Monsoon on record
2012 currently ranks as 4th warmest and 27th driest on record
 

Monsoonal moisture remained across the area during the 1st half of the month which led to isolated to scattered thunderstorms. The second half of the month saw little to no rainfall as moisture values were mostly below normal during this period.

 

Temperature extremes for the month ranged from a high of 103° on the 2nd to a low of 63° on the 16th. The monthly average temperature of 82.1° is one-half of a degree above normal and ranks as the 29th warmest September on record.

 
September 2012 daily high temperature departure from normal September 2012 daily low temperature departure from normal
Click on image above for larger view
 

Rainfall amounts across the metro area, using several sources like rainlog.org, the Pima County Regional Flood Control District gauges and CoCoRaHS, varied widely and ranged from a tenth of an inch to 2.50". Areas near the Tucson mountains recorded between 3" and 4.50". The International airport, which is the official recording location for Tucson, recorded only 0.38" which ranks as the 30th driest September on record.

 
September 2012 stats
Month
Normal
Departure
Average high temperature
94.2°
94.5°
- 0.3°
Average low temperature
69.9°
68.6°
+ 1.3°
Average temperature
82.1°
81.6°
+ 0.5°
Number of 100° + highs
6
7
- 1
Rainfall
0.38"
1.29"
- 0.91"

Monsoon 2012
 
The forecast for Monsoon 2012, issued by the Climate Prediction Center back in mid-June, called for enhanced probabilities for ABOVE normal temperatures and rainfall. Tucson recorded the 9th hottest and 53rd wettest monsoon on record.
 
Monsoon 2012 ended up with an average temperature of 86.1°, which is four-tenths of a degree above normal. Temperature extremes ranged from 109° on August 12th and 13th to a low of 63° on September 16th.
 

Rainfall amounts across the metro area for Monsoon 2012, using several sources like rainlog.org, the Pima County Regional Flood Control District gauges and CoCoRaHS, varied widely and ranged from a 2.50" to 12.50". Officially, the airport recorded 6.02" with 42% of this total occurring in a three day period in July (13th thru 15th)

 
Monsoon 2012 stats
Season
Normal
Departure
Average high temperature
98.4°
99.1°
- 0.7°
Average low temperature
73.7°
72.3°
+ 1.4°
Average temperature
86.1°
85.7°
+ 0.4°
Rainfall
6.02"
6.08"
- 0.06"
 
The average monsoon dewpoint temperature of 54.9 degrees was 2.2 degrees warmer than the historical average (1946-2012) of 52.7 degrees.

2012

The average yearly temperature to 73.9° ranks as the 4th warmest on record to date. This is 1.6° above normal. The average high temperature of 88.1° through the end of September ranks as the 8th warmest on record (tied with 1934) but well behind the record of 90.4° from 1989. The average low temperature of 59.6° through the end of September ranks as the 5th warmest on record (tied with 1997). The 2012 rainfall totals across the metro area ranged widely from three inches to nearly thirteen inches. At the airport, which is the official recording spot in Tucson, 6.70" was recorded which ranks as the 27th driest January thru September period on record.

 
2012 stats thru September
Year
Normal
Departure
Average high temperature
88.1°
86.2°
+ 1.9°
Average low temperature
59.6°
58.6°
+ 1.0°
Average temperature
73.9°
72.3°
+ 1.6°
Number of 100° + highs
73
62
+ 11
Rainfall
6.70"
9.20"
- 2.50"
2011-12 Water Year rainfall
9.76"
11.59"
- 1.83"
 

 
Looking ahead into October
The Climate Prediction Center forecasts enhanced probabilities for BELOW normal temperatures and rainfall.
  Daily normals | Daily records
Normal high temperature 84.8°
Normal low temperature 57.3°
Normal monthly temperature 71.0°
Record high temperature 102° on October 1, 2011 & October 3, 1993
Record low temperature 26° on October 30, 1971
Warmest October (avg) 76.8° in 1950
Coldest October (avg) 63.8° in 1908
Normal rainfall 0.89"
Wettest October day 2.96" on October 1, 1983
Wettest October 4.98" in 2000 & 1983
Driest October 0.00" in 1982 (last of 10 occurrences)
The number of daylight hours will increase from 11 hours 50 minutes on the 1st to 10 hours 54 minutes on the 31st, a loss of 56 minutes.
 
Glueck

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