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September 2013 climate report for Tucson Arizona
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September/Monsoon 2013 climate report for Tucson

Headlines
14th warmest and 41st driest September on record
Back-to-back daily lows in the lower 80s
4th warmest September low temperature on record
Coolest September low temperature since 2004
6th HOTTEST and 20th driest Monsoon on record
2013 currently ranks as 5th warmest and 11th driest on record
 

Isolated to scattered thunderstorms were around during the first half of the month as monsoonal moisture lingered over the area. During the second half of the month, a pair of Pacific weather systems moved across the state and pushed the monsoon moisture out of the area.

 

The monthly average temperature of 83.0° ranks as the 14th warmest September on record. Temperature extremes for the month ranged from a high of 104° on the 3rd & 5th to a low of 57° on the 28th. The 57° on the 28th was the first September low temperature to be in the 50s since 2006 (16th) when it was 59° and its the coolest September low temperature since 2004 (30th) when it was 55°. The airport also recorded very warm daily low temperatures during the month with the lows of 80° on the 16th and 81° on the 17th. Not only were these new daily record high minimum temperatures, this marked the first time since 1928 (17th/18th) that back-to-back daily lows were in the 80s. The 81° low on the 17th ranks as the 4th warmest September daily low on record (tied with three other September dates). The warmest September daily low on record is 84° from 2011 (1st). Two additional daily high minimum temperatures were set/tied (13th & 14th).

 
September 2013 daily high temperature departure from normal September 2013 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 two-tenths of an inch to 2" with localized spots up to 2.50". The International airport, which is the official recording location for Tucson, recorded only 0.63" which ranks as the 41st driest September on record.

 
September 2013 stats
Month
Normal
Departure
Average high temperature
95.5°
94.5°
+ 1.0°
Average low temperature
70.4°
68.6°
+ 1.8°
Average temperature
83.0°
81.6°
+ 1.4°
Number of 100° + highs
10
7
+ 3
Rainfall
0.63"
1.29"
- 0.66"

Monsoon 2013
 
The forecast for Monsoon 2013, issued by the Climate Prediction Center back in mid-June, called for enhanced probabilities for ABOVE normal temperatures and equal chance for below, normal or above normal rainfall. Tucson recorded the 6th hottest and 20th driest monsoon on record.
 
Monsoon 2013 ended up with an average temperature of 86.8°, which is 0.4° above normal. Temperature extremes ranged from 112° on June 29th to a low of 57° on September 28th.
 

Rainfall amounts across the metro area for Monsoon 2013, using several sources like rainlog.org, the Pima County Regional Flood Control District gauges and CoCoRaHS, varied widely and ranged from a 1.50" to 5.50" with localized spots between 6" to 8". Officially, the airport recorded 3.74" which is well below the normal of 6.08".

 
Monsoon 2013 stats
Season
Normal
Departure
Average high temperature
99.2°
99.1°
+ 0.1°
Average low temperature
74.3°
72.3°
+ 2.0°
Average temperature
86.8°
85.7°
+ 1.1°
Rainfall
3.74"
6.08"
- 2.34"
Average dewpoint temperature
51.0°
52.7°
- 1.7°

2013

The average yearly temperature to 73.8° ranks as the 5th warmest on record to date (tied with 2000). The average high temperature of 87.5° through the end of September ranks as the 14th warmest on record (tied with 1996). The average low temperature of 60.2° through the end of September ranks as the 3rd warmest on record. The 2013 rainfall totals across the metro area ranged widely from three inches to nearly thirteen inches. At the airport, which is the official recording location in Tucson, recorded 5.48" which ranks as the 11th driest January thru September period on record. The 2012-2013 hydrologic water year, which runs from October 1st to September 30th, was very dry with the Tucson airport recording only 6.69" which is just shy of 5" below normal and ranks as the 8th driest on record.

 
2013 stats thru September
Year
Normal
Departure
Average high temperature
87.5°
86.2°
+ 1.3°
Average low temperature
60.2°
58.6°
+ 1.6°
Average temperature
73.8°
72.3°
+ 1.5°
Number of 100° + highs
74
62
+ 12
Rainfall
5.48"
9.20"
- 3.72"
2012-13 Water Year rainfall
6.69"
11.59"
- 4.90"
 

 
Looking ahead into October
The Climate Prediction Center forecasts enhanced probabilities for ABOVE normal temperatures and equal chances for either below, normal or above normal 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, 2010 & 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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