BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 20, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
ABOVE NORMAL TEMPERATURES HAVE RETURNED...
AFTER COMFORTABLY DRY DAY YESTERDAY THE
DEW POINTS HAVE RISEN TO UPPER 60'S TO 70
DEGREES TODAY  
 
Warmer weather has returned with highs in the 80s
this weekend. On Saturday the dew points were in
the 50's and even dropped to the mid and upper 40's
for a short time during the late morning to around
noon.  Overnight increasingly humid air began to
arrive and conditions became very humid with dew
points reaching the upper 60's to 70 degrees by
late this morning.  
 
Today's observations: 
 
7 A.M.
Weather: Scattered altocumulus castellanus, scattered altocumulus
of a chaotic sky, castellanus SW-WSW in vicinity of station
Temperature: 68F, Dew point: 64F; Wind: SSW at 10 kts
Sea-level pressure: 29.90 inches Hg, rising 
Visibility: 12 miles, hazy
6-hour minimum temp: 63F 
24-hour rainfall: none
BHO SA 1155 60 SCT 100 SCT 140 –SCT 12 125/68/64/2010/990/
ACC VCTY STN SW-WSW AC CHAOTIC ALQDS HAZY/ 8/080 57003 
10068 20063
 
10 A.M.
Weather: Partial obscurement with haze obscuring
1/10 of sky, overcast altocumulus with numerous breaks
and thin spots in overcast
Temperature: 80F, Dew point: 70F; Wind: S at 11 kts,
Wind: Direction variable SSE to SSW
Sea-level pressure: 29.87 inches Hg, falling 
Visibility: 10 miles, hazy
BHO SA 1455 –X E150 OVC 10 114/80/70/1711/987/ H1
FEW LWR/HIER AC NMRS BINOVC ALQDS THN SPTS IOVC HAZY/
WND 15V21/ 8/030 58011
 
WEATHER SUMMARY FOR SATURDAY, JUNE 19
 
TEMPERATURE (DEGREES F)
MAX.....83     NORMAL.....76
MIN.....63     NORMAL.....57
MEAN....73     NORMAL.....67
 
DEPARTURE FROM 30-YEAR AVERAGE................+6
TOTAL DEPARTURE FOR THE MONTH................+25 [+1.1 DEGREE/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0   DEPARTURE........-2
TOTAL HEATING UNITS FOR THE MONTH............37   DEPARTURE.......-23
TOTAL HEATING UNITS FOR THE SEASON.........5678   DEPARTURE......-679
TOTAL HEATING UNITS LAST SEASON TO DATE....6209   DIFFERENCE.....-531
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 S   AT  1:05 P.M. *
                   AEROVANE..............33 S   AT 12:20 P.M.
                   ASOS..................33 SSE AT 12:51 P.M. 
                   DAVIS.................31 S   AT 12:10 P.M. 
THE FASTEST MILE FOR YESTERDAY...........25 S   AT 12:51 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............25 S   AT 12:52 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 S   AT 12:59 P.M.
AVERAGE WIND SPEED AND DIRECTION....... 15.5 S
                   ASOS.................15.4
                   DAVIS................14.3 S [190 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 THE MONTH..........1.76  DEPARTURE......-0.74
                         ASOS..............1.71
TOTAL PRECIPITATION FOR THE YEAR..........35.17  DEPARTURE.....+10.93
                         ASOS.............35.19  
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2010 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
 
6/1  82/57/70/+8/0.86/0/199/22  33 WNW  AERO 38 MPH WNW TSTM
6/2  80/59/70/+8/0.00/752/83    22 S
6/3  80/59/70/+8/T/263/29       28 S    AERO 31 MPH S TSTM  
6/4  84/59/72/+9/0/499/55       23 SSW
6/5  83/63/73/+10/0.16/309/34   32 W    AERO 36 MPH W TSTM
6/6  80/54/67/+4/0.07/064/07    43 S    AERO 48 MPH S TSTM
6/7  72/51/62/-2/T/683/75       27 W    AERO 30 MPH WNW
6/8  69/51/60/-4/T/812/89       30 WNW  AERO 33 MPH WNW
6/9  70/49/60/-4/0.18/247/27    27 SSW
6/10 58/50/54/-10/0.13/0/0      22 ESE
6/11 68/53/61/-4/0/320/35       20 S
6/12 66/55/61/-4/0.22/.../..    18 SSE
6/13 64/56/60/-5/0.02/0/0       18 N
6/14 75/56/66/+1/0.01/247/27    22 NNW
6/15 77/53/65/-1/0/.../..       21 WNW
6/16 75/56/66/0/0.10/.../..     29 S    AERO 31 MPH S
6/17 72/58/65/-1/0.01/.../..    29 WNW
6/18 86/58/72/+6/0/.../..       21 SW
6/19 83/63/73/+6/0/.../..       32 S   
 
6/20 our morning low temp: 63F; the normal low is now 57F
 
NEW DAILY RECORDS FOR JUNE 2010
None to date
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 20
HIGH 94F IN 1953
LOW 41F IN 1918
PRECIP 2.62 INS 1945
PEAK GUST 63 MPH NE IN 1967
 
RECORDS FOR JUNE 21
HIGH 92F IN 1949
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000
 
TODAY'S REPORT PREPARED BY: Robert Skilling