BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 27, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Cooler temperatures and cloudy skies with light winds for
the 7 AM observation led to good visibility early.
 
Visibility slowly decreased throughout the day as moist air
began to move in by the 1 o'clock observation.  Overcast skies
remained with winds very light and variable throughout the day.  
 
Today's Observations:

7 A.M.
Weather: Overcast Thick Cirrostratus, Few Cumulus E-SW
Temperature: 63F; Dew Point: 50F; Wind: SE at 6 kts
Sea-level pressure: 30.17 ins. Hg, Steady then increasing
Visibility: 70 miles, Light distant haze 
6-hr Max temp: 63F
6-hr Min temp: 59F
24-hr precip: 0.01
BHO SA 1155 E250 OVC 70 217/63/50/1306/017/ FEW CU E-SW
LGT DSNT HZ 8/106 53018 70001 10063 20059
 
10 A.M.
Weather: Thin overcast Altostratus, Few Altocumulus SE-S
Temperature: 70F; Dew Point: 46F; Wind: Variable at 4 kts
Wind: Light and Variable
Sea-level pressure: 30.17 ins. Hg, same as 3 hours ago
Visibility: 60 miles, light distant haze
BHO SA 1455 E220 -OVC 60 217/70/46/VRB04/017/ FEW AC SE-S
LGT DSNT HZ 8/09/ 58000   
 
1 P.M.
Weather:  Overcast thick cirrostratus, few cumulus all
quadrants
Temperature: 72F; Dew Point: 54F; Wind: Variable at 5 kts
Wind: Light and Variable
Sea-level pressure: 30.15 ins. Hg, falling slightly
Visibility: 55 miles, light distant haze 
6-hr Max temp: 72F 
6-hr Min temp: 63F
BHO SA 1755 E260 OVC 55 210/72/54/VRB05/015/ FEW CU ALQDS
LGT DSNT HZ 8/109 56007 10072 20063
 
 
SUMMARY FOR FRIDAY, JUNE 26, 2015
  
TEMPERATURE (DEGREES F)
MAX.....72   NORMAL.....78
MIN.....58   NORMAL.....60
MEAN....65   NORMAL.....69

DEPARTURE FROM 30-YEAR NORMAL........................-4
TOTAL DEPARTURE FOR THE MONTH.......................-19 [-0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0  DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH..............87  DEPARTURE..........+16
TOTAL HEATING UNITS FOR THE SEASON...........6491  DEPARTURE.........+118
TOTAL HEATING UNITS LAST SEASON TO DATE......6422  DIFFERENCE.........+68

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-6
TOTAL COOLING UNITS FOR THE MONTH..............83   DEPARTURE..........0
TOTAL COOLING UNITS FOR THE SEASON............132   DEPARTURE.........+25
TOTAL COOLING UNITS LAST SEASON TO DATE........81   DIFFERENCE........+45

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................23 NNE  AT   5:44 A.M.                 
                   ASOS........................24 NNE  AT   5:45 A.M.
                   DAVIS.......................22 NE   AT   4:54 A.M. RMY 21
FASTEST MILE FOR YESTERDAY.....................18 NNE  AT   4:35 A.M.          
MAXIMUM 2-MINUTE ASOS AVERAGE..................16 NNE  AT   4:39 A.M.                 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................15 NE   AT   4:55 A.M.          
AVERAGE WIND SPEED AND DIRECTION............. 9.1 ENE
                   ASOS.......................9.7
                   DAVIS......................8.1  NE [43 deg.]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.01  DEPARTURE....-0.11
                         ASOS...............0.01
TOTAL PRECIPITATION FOR THE MONTH...........3.39   DEPARTURE....-0.47
                         ASOS...............3.40
TOTAL PRECIPITATION FOR THE YEAR.......... 22.76   DEPARTURE....-3.63
                         ASOS...............N/A ***
 
*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/..../000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32 
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A 
6/11 85/61/73/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/..../522/57              26 S   RMY 29
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/..../000/00               25 SE  RMY 26
6/16 73/56/65/-1/..../009/01               18 NW  RMY N/A
6/17 70/57/64/-3/0.00/.../..               28 NE  RMY 28
6/18 76/54/65/-2/0.00/.../..               22 S   RMY 26
6/19 84/60/72/+5/T/.../..                  24 SSW RMY 22
6/20 75/56/66/-2/..../.../..               23 SSE RMY N/A
6/21 76/60/68/0/..../.../..                26 S   RMY 29
6/22 83/63/73/+5/0.00/.../..               20 WNW RMY 19
6/23 85/67/76/+8/0.01/.../..               36 S   RMY 38
6/24 82/62/72/+3/0.00/.../..               25 WNW RMY 27
6/25 80/60/70/+1/0.00/.../..               21 W   RMY N/A
6/26 72/58/65/-4/0.01/.../..               23 NNE RMY 21
 
6/27 low since midnight is 58F; normal low is now 60F

DAILY RECORDS FOR JUNE 2015
 
6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 27
HIGH 93F IN 1999, 2007
LOW 46F IN 1897
PRECIP 1.72 INS IN 1938
PEAK GUST 55e N IN 1945
 
RECORDS FOR JUNE 28
HIGH 95F IN 1991
LOW 47F IN 1970
PRECIP 2.09 INS IN 1938
PEAK GUST 52 MPH WSW IN 1993
 
TODAY'S REPORT PREPARED BY: Robert Millette