September is a summer month in south GA. Warm and as humid as any month. For the first 2 weeks of September, heat continues as in August---after that some cool fronts can come and temper the heat from time to time. Rainfall begins to decrease dramatically the last week of the month.
Average high temperatures fall at a slowly accelerating rate by 5.7 degrees between August 31 and September 30. Low temperatures fall very slowly during the first 10 days of September, then speed up their fall, decreasing by 6.1 degrees between August 31 and September 30. About half of Septembers get down into the 50s, and I hope this year is one of them!
A web briefing by the JAX NWS office about the summer of 2011 can be viewed here.
The technical weather discussion from the JAX wx office can be read here.
And the official climate reports for St. Simons Island and other local stations can be viewed here.
And the weather observations for St. Simons Island for the past 72 hours can be viewed here.
Date..............actual..............normal................departure.............notes
Sep 1...........74.3 / 85.8.......73.6 / 86.7...........-0.1
Sep 2...........68.9 / 85.5.......73.6 / 86.6...........-2.9
Sep 3...........71.1 / 86.0.......73.5 / 86.5...........-1.4
Sep 4...........70.9 / 86.7.......73.5 / 86.4...........-1.1....................1.00" rain
Sep 5...........70.9 / 87.6.......73.3 / 86.2...........-0.5....................0.07" rain
Sep 6...........70.9 / 82.0.......73.3 / 86.1...........-3.2....................lowest average diurnal range.
Sep 7...........64.4 / 82.4.......73.2 / 86.0...........-6.2....................lowest average diurnal range.
Sep 8...........61.7 / 80.6.......73.0 / 85.9...........-8.3
Sep 9...........63.1 / 83.8.......72.8 / 85.8...........-5.8
Sep 10.........67.1 / 84.6.......72.7 / 85.6...........-3.3
Sep 11.........70.9 / 85.8.......72.5 / 85.4...........-0.6
Sep 12.........70.9 / 86.2.......72.3 / 85.2...........-0.2
Sep 13.........68.9 / 87.6.......72.1 / 85.1...........-0.3
Sep 14.........71.4 / 85.3.......71.9 / 84.9...........-0.0
Sep 15.........72.0 / 91.0.......71.7 / 84.7..........+3.3
Sep 16.........70.9 / 82.0.......71.6 / 84.6...........-1.6
Sep 17.........62.8 / 75.7.......71.3 / 84.4...........-8.6
Sep 18.........64.4 / 75.9.......71.1 / 84.2...........-7.5...................0.87 feet / 1,170 cfs flow in Altamaha river.
Sep 19.........66.9 / 80.4.......70.8 / 84.0...........-3.7
Sep 20.........71.2 / 82.4.......70.6 / 83.8...........-0.4...................0.41" rain
Sep 21.........72.1 / 82.6.......70.4 / 83.7..........+0.3...................0.12" rain
Sep 22.........73.0 / 86.0.......70.1 / 83.5..........+2.7...................last day of late summer
Sep 23.........72.5 / 86.0.......69.9 / 83.3..........+2.6...................first day of early fall.......0.14" rain
Sep 24.........70.9 / 85.6.......69.5 / 83.1..........+1.9
Sep 25.........70.9 / 88.0.......69.3 / 82.8..........+3.4...................0.73" rain
Sep 26.........68.7 / 85.6.......69.0 / 82.5..........+1.4...................0.55" rain
Sep 27.........69.4 / 85.1.......68.7 / 82.2..........+1.8
Sep 28.........71.8 / 87.6.......68.3 / 81.9..........+4.6
Sep 29.........68.5 / 83.1.......67.9 / 81.6..........+1.0
Sep 30.........69.6 / 86.7.......67.6 / 81.3..........+3.7
Highs for 2011
40s...........4
50s.........20
60s.........33
70s.........47
80s.........95
90s.........73
100s.........1
Lows for 2011
20s..........4
30s.........15
40s.........27
50s.........49
60s.........44
70s.......125
80s...........9
Freezes.......6
On September 8, St. Simons Island had a record low of 63, breaking the old record low of 64 set in 1972.
On September 9, St. Simons Island had a record low of 64, breaking the old record low of 65 set in 1956.
Gosh durn it! We did get to 80 officially after all. When looking at the hourly obs I was sure we had not. http://www.srh.noaa.gov/data/obhistory/KSSI.html
ReplyDeleteBut in fact we did. The 75.7 shade temp at my house also fooled me.
That does not change the feeling that this was our first mild fall day!
ReplyDeleteToday September 18 was our first day with a high below 80 since May 17th! I made a mistake yesterday but corrected it. Our high temperature distribution is so top heavy with 80s and 90s. It will be nice to get more balance in the counts as fall wears on.
ReplyDeleteNothing will come close to dethroning the 70s from the lead in lows however.
Today September 21 the day was 2 hours shorter than the summer solstice.
ReplyDeleteThe last day of late summer being September 22 and the first day of early fall being September 23 has nothing to to with the equinox. I define late summer as when highs average in the 80s and lows in the 70s. For a couple weeks the average high is still in the 80s but now the average lows are in the 60s. That is early fall.
ReplyDeleteOn September 25 we passed 2010's total of 24.27" of rain for the year. An improvement, but we are still nearly 11" below the new, revised, lower normal year to date. That helps show how dry last year really was.
ReplyDelete