BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 2, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
SEPTEMBER OFF TO COOL AND VERY SUNNY START
LOWS IN THE 40'S SURROUNDING LOWLANDS
 
Temperatures are averaging several degrees
below normal to begin the new month.  Along
with the cool temperatures has come dry air
with early morning radiational cooling.
Temperatures dropped into the 40's early today
in the surrounding countryside.  Sunshine
was 98% of possible for yesterday and will
be near 100% today.
 
THE AUGUST 2009 STATS (Please see our website, bluehill.org,
For additional details about August and the summer of 2009.  
 
AUGUST 2009
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, {SKC}, not a cloud
Temperature: 60F, Dew point: 50F, Wind: N at 8 kts,
Wind: direction gradually veering  
Sea-level pressure: 30.31 inches Hg, rising
Visibility: 50 miles, 25 N-NE, 60 NW 
6-hour minimum temp: 54F
24-hour precipitation: 0.00
BHO SA 1155 CLR 50 265/60/50/3608/031/ SKC INVSN DSSPTNG
FEW PTCHS STEAM FG DSSPTG OVR PONDS SE PST HR
THN SHLW K LYR ALG HRZN N-NE VSBY N-NE 25 NW 60
WND GRDLY VEERING/ 53010 10060 20054   
 
10 A.M.
Weather: Clear, [SKC] not a cloud 
Temperature: 70F, Dew point: 53F, Wind: SE at 3 kts,
Wind: light and variable
Sea-level pressure: 30.33 inches Hg, rising
Visibility: 45 miles, N 30, NE 25, W-NW 55,
light distant haze   
BHO SA 1455 CLR 45 271/70/53/1303/033/ SKC THN K ABV HRZN NW-N
LGT DSNT HZ VSBY N 30 NE 25 W-NW 55 WND L/V/ 51006
 
1 P.M.
Weather: Clear, few small cumulus distant SE-SW  
Temperature: 75F, Dew point: 52F, Wind: S at 6 kts,
Wind: light and variable
Sea-level pressure: 30.30 inches and falling
Visibility: 55 miles, lower NE-SE, 70 NW
6-hour max. temp: 75F
BHO SA 1755 CLR 55 260/75/52/1706/030/ FEW SML CU DSNT SE-SW
VSBY LWR NE-SE NW 70 LGT DSNT HZ WND L/V/ 8/100 56011 10075
20060
 
WEATHER SUMMARY FOR MONDAY, SEPTEMBER 1
 
TEMPERATURE (DEGREES F)
MAX.....71    NORMAL.....75
MIN.....51    NORMAL.....58
MEAN....61    NORMAL.....67
 
DEPARTURE FROM 30-YEAR AVERAGE...........-6
TOTAL DEPARTURE FOR THE MONTH............-6 [-6.0 DEG/DAY]
.
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............17 NW  AT 12:43 A.M. *      
                   AEROVANE..............16 NW  AT  1:03 A.M.  
                   ASOS..................17 NNW AT  1:10 A.M.   
                   DAVIS................ 19 NW  AT 12:07 A.M.   
FASTEST MILE FOR YESTERDAY...............13 NW  AT 12:09 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE............14 NNW AT 12:34 A.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 NW  AT 12:08 A.M.   
AVERAGE WIND SPEED AND DIRECTION....... 7.9 NNW   
                   ASOS.................8.1 
                   DAVIS................6.9 N [350 DEG]
 
* last of several occurrences....
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH..............0.00   DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+1.17
                         ASOS.............35.92
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST-SEPTEMBER 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   AERO 35 WNW
8/30 74/53/64/-3/0/246/31     23 SW
8/31 69/54/62/-5/0/522/66     23 WNW
 
9/1  71/51/61/-6/0/.../..     17 NW
9/2  our morning low temp: 54F; the normal low is now 57F
 
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 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
 
RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1983
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)
 
TODAY'S REPORT PREPARED BY: Robert Skilling