BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 27, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
TODAY IS 7TH CONSECUTIVE DAY WITH WINDS FROM THE EAST
VARIABLE HIGH CLOUDINESS AS COOLING TREND CONTINUES
 
Starting September 21 and continuing each day into today
our winds have had an easterly component as large high
continues to build down from the north. Barometer readings
have risen as high as 30.50 inches with variable high
cloudiness but a mostly sunny sky. A Brush fire broke out on
the Northern portion of the Blue Hills Reservation with smoke 
drifting into the sky to the North-Northeast and moving West. 
 
Today's Observations:
 
7 A.M.
Weather: Scattered Cirrus, Few Cumulus distant to the East
Temperature: 50F; Dew Point: 42F; Wind: N at 5 kts,
Wind: Light
Sea-level pressure: 30.52 ins. Hg, decreasing then increasing
Visibility: 45 miles, light distant haze
6-hr Max temp: 50F 
6-hr Min temp: 46F
24-hr precip: none
BHO SA 1155 250 SCT 45 335/50/42/3605/052/ FEW CU DSNT E
WND LGT LGT DSNT HZ 8/102 53009 10050 20046
 
10 A.M.
Weather: Few Cirrus, few Cirrostratus distant East Southeast to West
Temperature: 60F; Dew Point 45F; Wind: Estimated Variable at 3 kts,
Wind: Light and Variable
Sea-level pressure: 30.51 ins. Hg, steady then decreasing
Visibility: 70 miles
BHO SA 1455 CLR 70 333/60/45/VRB03/051/ FEW CI ALQDS FEW CS DSNT ESE-W
WND LGT AND VRB 8/002 56002
 
1 P.M.
Weather: Few Cumulus SSE-E. Few Cirrostratus WSW-SE, Few Cirrus ENE-
SE, Smoke from a brush fire approximately 3 miles NNE of the
Observatory drifting West
Temperature: 69F; Dew Point: 51F; Wind: Estimated Variable at 4 kts
Wind: Light and Variable
Sea-level pressure: 30.44 ins. Hg, Steady then falling rapidly
Visibility: 75 miles
6-hr Max: 69F
6-hr Min: 50F
BHO SA 1755 CLR 75 309/69/51/VRB04/044/ FEW CU SSE-E FEW CS WSW-SE FEW CI
ENE-SE WND LGT AND VRB SMK FRM BRSH FRE NNE-N DRFT W 8/105 58024
10069 20050
 
SUMMARY FOR SATURDAY, SEPTEMBER 26, 2015
  
TEMPERATURE (DEGREES F)
MAX.....63   NORMAL.....68
MIN.....49   NORMAL.....51
MEAN....56   NORMAL.....59
 
DEPARTURE FROM 30-YEAR NORMAL........................-3
TOTAL DEPARTURE FOR THE MONTH......................+123  [+4.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH.............131   DEPARTURE.........+74
TOTAL COOLING UNITS FOR THE SEASON............797   DEPARTURE........+203
TOTAL COOLING UNITS LAST SEASON TO DATE.......571   DIFFERENCE.......+226
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............9   DEPARTURE..........+2
TOTAL HEATING UNITS FOR THE MONTH..............35   DEPARTURE.........-52
TOTAL HEATING UNITS FOR THE SEASON.............36   DEPARTURE.........-76
TOTAL HEATING UNITS LAST SEASON TO DATE........91   DIFFERENCE........-55

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................25  ENE AT  9:54 A.M. 
                   ASOS........................25  N   AT 10:37 A.M.      
                   DAVIS.......................23  E   AT  9:54 A.M. RMY 25
FASTEST MILE FOR YESTERDAY.................... 17 ENE  AT  9:05 A.M.      
MAXIMUM 2-MINUTE ASOS AVERAGE..................17 ENE  AT 12:31 P.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 ENE  AT  9:54 A.M.      
AVERAGE WIND SPEED AND DIRECTION............. 9.3  E
                   ASOS.......................9.4  
                   DAVIS......................8.3 ENE [070 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.15
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........1.35  DEPARTURE.....-2.12
                         ASOS...............1.33
TOTAL PRECIPITATION FOR THE YEAR...........31.60  DEPARTURE.....-6.88
                         ASOS................N/A ***
*** ASOS annual total not available due to erroneous readings
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
 
9/1  81/65/73/+5/0.00/766/97               20 SSW RMY 20
9/2  89/64/77/+9/0.00/732/93               20 SW  RMY 21 
9/3  85/66/76/+9/T/612/78                  17 E   RMY N/A TSTM
9/4  72/58/65/0/0.00/297/38                31 ENE RMY N/A
9/5  77/55/66/-1/0.00/748/96               14 SW  RMY 18
9/6  87/57/72/+5/0.00/753/97               21 SSW RMY 22
9/7  92/63/78/+12/0.00/727/94              23 WSW RMY 24
9/8  97/70/84/+18/0.00/693/90              22 WSW RMY 24
9/9  92/70/81/+15/0.00/683/89              30 SSW RMY 33
9/10 73/62/68/+3/..../000/00               29 NE  RMY N/A
9/11 70/59/65/0/..../084/11                33 NE  RMY N/A
9/12 75/58/67/2/..../380/50                18 SSE RMY 25
9/13 66/60/63/-1/..../000/00               25 E   RMY N/A
9/14 70/53/62/-2/0.00/550/73               33 W   RMY 35
9/15 82/56/69/+5/0.00/736/98               23 W   RMY N/A
9/16 84/62/73/+10/0.00/711/95              17 NW  RMY N/A
9/17 87/64/76/+13/0.00/723/97              17 SW  RMY 16
9/18 86/64/75/+13/0.00/712/96              21 SSW RMY 21
9/19 80/62/71/+9/0.00/.../..               22 S   RMY N/A
9/20 74/55/65/+3/T/..../...                24 S   RMY N/A 
9/21 65/50/58/-3/0.00/.../..               29 ENE RMY 30
9/22 67/55/61/+0/0.00/.../..               21 E   RMY 21
9/23 72/50/61/+1/0.00/.../..               15 E   RMY N/A
9/24 72/56/64/+4/0.00/.../..               22 E   RMY 21  
9/25 66/53/60/0/0.00/.../..                21 E   RMY 20
9/26 63/49/56/-3/0.00/.../..               25 ENE RMY 25
 
9/27 low since midnight is 46F; normal low is now 51F 
 
DAILY RECORDS FOR SEPTEMBER 2015
 
**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
TIES PREVIOUS RECORD SET IN 2007**
 
**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**
 
**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**
 
**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**
 
**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**
 
**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**
 
**9/18 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F
TIES PREVIOUS RECORD SET IN 1992**
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 27
HIGH 84F IN 1998,2014
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)
 
RECORDS FOR SEPTEMBER 28
HIGH 86F IN 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962
 
TODAY'S REPORT PREPARED BY: Robert Millette