BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 1, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
THE AUGUST 2009 STATS
Temp. Deg. F
Av. Max. 80.7
Av. Min. 63.5
Mean     72.1 {+2.2)
Highest: 91 on 17-18
Lowest:  53 on 29-30
Total heating units: 14 [-8]
Total cooling units: 244 [+71]
Total cooling for season: 442 [-64]
Total precip: 3.51 ins. [-0.55 in. ]
Wind: 10.0 MPH (corr); 9.4 (uncorrected)
Prevailing direction: S 16%
Peak gust: 40 MPH S on 21st
Fastest mile: 30 MPH S on 21st 
Sunshine: 64% of possible, average for Aug. 58%
Total astronomical minutes; 16437 or 274.0 hours
Total sun card minutes: 15834 or 263.9 hours
 
Today's observations:
 
7 A.M.  
Weather: Clear, few stratocumulus distant SSE and
cirrus east thru south 
Temperature: 54F, Dew point: 48F, Wind: N at 9 kts,
Wind: direction gradually veering  
Sea-level pressure: 30.29 inches Hg, rising
Visibility: 75 miles,
6-hour minimum temp: 51F
24-hour precipitation: 0.00
BHO SA 1155 CLR 75 256/54/48/3509/029/
FEW SC DSNT SSE CI DSNT E-S WND GRDLY VEERING/
8/501 51016 10054 20051
 
10 A.M.
Weather: Clear, cumulus forming except overhead through
northeast-east mostly east-southeast thru southwest,
few cumulus congestus 
Temperature: 66F, Dew point: 46F, Wind: NE at 7 kts,
Wind: direction variable NNW to E
Sea-level pressure: 30.32 inches Hg, rising
Visibility: 70 miles
BHO SA 1455 CLR 70 266/66/46/0407/032/
CU FRMG XCPT OVHD-NE-E MSTLY ESE-SW
FEW MDT CU WND 34V10/ 8/200 51010
 
1 P.M.
Weather: Scattered cumulus humilus, scattered dense
cirrus (layer east thru south-southwest 
Temperature: 70F, Dew point: 47F, Wind: N at 5 kts,
Wind: light and variable
Sea-level pressure: 30.29 inches Hg, falling
Visibility: 65 miles, 70 northwest 
6-hour max. temp: 70F 
BHO SA 1755 50 SCT 220 SCT 65 257/70/47/3605/029/ DENS CI LYR E-SSW
WND L/V/ 8/102 58009 10070 20054
 
WEATHER SUMMARY FOR MONDAY, AUGUST 31
 
TEMPERATURE (DEGREES F)
MAX.....69    NORMAL.....76
MIN.....54    NORMAL.....58
MEAN....62    NORMAL.....67
 
DEPARTURE FROM 30-YEAR AVERAGE...........-5
TOTAL DEPARTURE FOR THE MONTH...........+78 [+2.2 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 WNW AT  2:32 P.M. *  
                   AEROVANE..............22 WNW AT  2:32 P.M. 
                   ASOS..................22 WNW AT  2:32 P.M.  
                   DAVIS................ 23 WNW AT  1:54 P.M.  
FASTEST MILE FOR YESTERDAY...............14 WNW AT  1:55 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE............15 WNW AT  2:33 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 W   AT  1:55 P.M. 
AVERAGE WIND SPEED AND DIRECTION....... 9.7 WNW  
                   ASOS.................9.3 
                   DAVIS...............10.2 WNW [290 DEG]
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR AUGUST.............3.51   DEPARTURE....-0.55
                         ASOS..............3.54
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+1.30
                         ASOS.............35.92
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  83/63/73/+1/0/823/95     18 SSE
8/2  77/64/71/-1/T/104/12     25 SSE
8/3  84/67/76/+4/0/638/74     17 SW
8/4  83/66/75/+3/0/714/83     23 S
8/5  86/67/77/+5/T/378/44     27 SSW  TSTM
8/6  76/61/69/-3/0/564/66     18 SSE
8/7  79/58/69/-2/0/836/98     32 W
8/8  74/55/65/-6/0/791/93     21 WNW
8/9  76/59/68/-3/T/178/21     25 SSE 
8/10 87/66/77/+6/0.12/584/69  27 W    TSTM 
8/11 84/66/75/+4/0.54/684/81  25 NE   TSTM 
8/12 67/63/65/-6/T/000/00     18 N
8/13 66/60/63/-8/0.18/042/05  23 NNE
8/14 83/58/71/+1/0/761/91     16 S
8/15 88/66/77/+7/0/809/97     18 S
8/16 90/68/79/+9/0/748/90     22 S
8/17 91/69/80/+10/0/753/91    21 WSW
8/18 91/72/82/+12/0/776/94    29 SSW
8/19 89/71/80/+10/0/716/87    23 SW
8/20 83/70/77/+8/0.34/558/68  21 SSE  TSTM
8/21 88/72/80/+11/T/384/47    40 S    AERO 39 MPH S
8/22 86/71/79/+10/0.03/628/77 28 S
8/23 86/69/78/+9/0.50/366/45  25 S   
8/24 84/67/76/+7/0/462/57     30 N 
8/25 82/65/74/+6/0/670/83     21 S
8/26 84/65/75/+7/0/604/75     32 W
8/27 75/56/66/-2/0/794/99     29 NW
8/28 71/55/63/-5/0.31/304/38  26 SE
8/29 65/53/59/-8/1.49/000/00/ 35 NW   
8/30 74/53/64/-3/0/246/31     23 SW
8/31 69/54/62/-5/0/522/66     23 WNW
 
9/1  our morning low temp: 51F; the normal low is now 58F
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
 
8/19: RECORD HIGH MINIMUM TEMPERATURE 71F;
      equals record previously set in 2002
8/23: RECORD HIGH MINIMUM TEMPERATURE 69F;
      equals record previously set in 1906
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 1
HIGH 93F IN 1969
LOW 47F IN 1975
PRECIP 1.60 INCHES IN 1927
PEAK GUST 59e MPH S IN 1945, SSW IN 1965
 
RECORDS FOR SEPTEMBER 2
HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD)
LOW 44F IN 1909
PRECIP 2.73 INCHES IN 1947
PEAK GUST 55e MPH WNW IN 1944
 
TODAY'S REPORT PREPARED BY: Robert Skilling