BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 29, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MUCH COOLER AND DRIER AIR MASS BRINGS LOW TENP. OF 56F
CLEAR, SUNNY WITH SPECTACULAR VISIBILITY UP TO 80 TO 90 MILES
DEW POINTS DROPPING INTO 40'S AFTER LOW 70'S YESTERDAY
 
A complete change in air mass has occurred beginning late
yesterday afternoon with dew points falling to the 50's
by last evening from the lower 70's in the morning. Today
dew points have lowered to the mid-40's in a very dry
polar air mass from Canada.  Mt. Washington has reported
up to their maximum of 130 miles when the intermittent
fog parts. Although we're reporting 85 miles, our
visibility could very well be 90 to 100 miles, since it's
so very clear.  Maximum temperatures have reached only
72F by early afternoon, and today will become only one
of four days this month that didn't reach the 80's.
 
Today we're getting a break from above normal temperatures.
A list of the warmest August records can be viewed below.
 
BHO Warmest Augusts (deg F), 1885-2011:
1) 72.5 in 1988
2) 72.3 in 2005
3) 72.1 in 2002
4) 72.0 in 2001
 
The corrected mean temperature for August through the 28th is 73.0 F.
 
Today's observations:
 
7 A.M.
Weather:  Clear, line of cumulus distant above the horizon
extending NE-SSE
Temperature: 60F; Dew Point: 50F; Wind: NW at 8 kts,
Wind: Direction variable
Sea-level pressure: 29.96 ins. Hg, falling   
Visibility: 75 miles, light distant haze
24-hour precip: 0.69 inch
6-hour min. temp: 56F
BHO SA 1155 CLR 75 147/60/50/3108/996/ LINE OF CU/FEW MDT
DSNT ABV HRZN XTDNG NE-SSE LGT DSNT HZ WND 29V35/ 8/200
51019 MANUAL 70069 ASOS 70069 10063 20056
 
10 A.M.
Weather: Clear, small cumulus mostly distant N-SSE 
Temperature: 66F; Dew Point: 44F; Wind: NNW at 8 kts
Sea-level pressure: 29.97 ins. Hg, falling   
Visibility: 85 miles, very light distant haze  
BHO SA 1455 CLR 85 150/66/44/3408/997/ SML CU N-SSE MSTLY DSNT
VRY LGT DSNT HZ WND 29V02/ 8/100 52003
 
1 P.M.
Weather: Clear, few small cumulus fractus ESE-SSE and few cumulus
distant ESE and near horizon distant NW
Temperature: 72F; Dew Point: 46F; Wind: WNW at 5 kts
Sea-level pressure: 29.96 ins. Hg, falling
Visibility: 85 miles
6-hour max. temp: 72F 
6-hour min. temp: 60F
BHO SA 1755 CLR 85 147/72/46/2905/996/ FEW SML CUFRA/CU ESE-SSE AND
FEW CU DSNT ESE FEW CU NR HRZN DSNT NW/ 8/100 58003 10072 20060
 
WEATHER SUMMARY FOR TUESDAY, AUGUST 28
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....77
MIN.....66    NORMAL.....60
MEAN....74    NORMAL.....69
 
DEPARTURE FROM 30-YEAR NORMAL.....................+5
TOTAL DEPARTURE FOR THE MONTH....................+97 [+3.3 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............29 SSW AT 12:56 A.M.
                   AERO..................30 SSW AT 12:56 A.M.
                   ASOS..................29 SSW AT 12:57 A.M.
                   DAVIS.................28 SSW AT 12:56 A.M.  RMY 30
THE FASTEST MILE FOR YESTERDAY...........20 WSW AT 12:57 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............20 WSW AT 12:58 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 WSW AT 12:58 A.M.
AVERAGE WIND SPEED AND DIRECTION........9.4 WNW
                   ASOS.................8.7
                   DAVIS................8.7 W [260 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.69   DEPARTURE...........+0.58
                         ASOS..............0.69
TOTAL PRECIPITATION FOR THE MONTH..........3.74   DEPARTURE...........+0.04
                         ASOS..............3.70
TOTAL PRECIPITATION FOR THE YEAR..........25.35   DEPARTURE...........-9.34
                         ASOS.............25.25
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  82/66/74/+2/0.58/390/45        33 W   AERO 33 MPH W   RMY 35
8/2  87/67/77/+5/T/648/75           20 W   AERO 20 MPH W   RMY 20
8/3  90/70/80/+8/0.00/707/82        23 SW  AERO 23 MPH SW  RMY 23
8/4  91/72/82/+10/0.00/713/83       22 S   AERP 21 MPH S   RMY 23
8/5  87/72/80/+8/0.14/660/77        37 S   AERO 37 MPH SSW RMY 37
8/6  82/67/75/+3/0.00/710/83        25 WNW AERO 27 MPH WNW RMY 26
8/7  84/65/75/+3/0.00/725/85        23 S   AERO 21 MPH S   RMY 23
8/8  87/68/78/+6/0.00/578/68        20 S   AERO 18 MPH S   RMY 18
8/9  89/68/79/+7/0.00/630/77        25 S   AERO 23 MPH S   RMY 25
8/10 84/70/77/+6/0.87/228/27        32 SE  AERO 32 MPH SE  RMY 32 TSTM
8/11 84/69/77/+6/0.00/464/55        25 S   AERO 27 MPH S   RMY 27
8/12 83/70/77/+6/0.03/420/50        24 S   AERO 23 MPH S   RMY 23
8/13 84/66/75/+4/0.00/787/94        21 WNW AERO 20 MPH WNW RMY 19
8/14 81/64/73/+2/0.00/451/54        18 W   AERO 18 MPH SW  RMY 19
8/15 83/63/73/+2/0.89/358/43        33 W   AERO 33 MPH W   RMY 32 TSTM
8/16 82/64/73/+2/T/714/86           23 WNW AERO 22 MPH WNW RMY 21
8/17 84/65/75/+4/T/729/88           26 S   AERO 26 MPH SSW RMY 27
8/18 69/62/66/-5/0.22/0/0           18 WNW AERO 17 MPH WNW RMY 16
8/19 73/56/65/-5/T/353/43           17 N   AERO 16 MPH NNW RMY 16
8/20 77/61/69/-1/0.00/312/38        16 SSW AERO 15 MPH SSW RMY 16
8/21 81/62/72/+2/0.01/539/66        21 W   AERO 20 MPH W   RMY 19 
8/22 82/62/72/+2/0.00/766/94        17 W   AERO 17 MPH SW  RMY N/A
8/23 85/63/74/+4/0.00/771/95        21 SSW AERO 21 MPH SSW RMY 21
8/24 80/65/73/+3/0.00/648/80        18 W   AERO 16 MPH W   RMY 16
8/25 80/64/72/+3/0.00/492/61        20 ESE AER0 18 MPH ESE RMY 18
8/26 80/63/72/+3/0.00/675/84        17 SW  AERO 15 MPH SW  RMY 16
8/27 84/61/73/+4/0.00/.../..        28 S   AERO 29 MPH S   RMY N/A
8/28 82/66/74/+5/1.00/.../..        29 SSW AERO 30 MPH SSW RMY 30
 
8/29 our morning low temp: 56F; the normal low is now 60F
 
DAILY RECORDS FOR AUGUST 2012
8/4 - DAILY RECORD HIGH MINIMUM TEMP OF 72F;
      ties the current record of 72F in 1974.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 29
HIGH 95F IN 1953
LOW 41F IN 1982
PRECIP 2.88 INCHES IN 1962
PEAK GUST 70e MPH S IN 1949
 
RECORDS FOR AUGUST 30
HIGH 94F IN 1953
LOW 39F IN 1965
PRECIP 2.75 INCHES IN 1936
PEAK GUST 43 MPH NW IN 1965
 
TODAY'S REPORT PREPARED BY: Robert Skilling