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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 23, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM TEMPS, CLEARING SKIES, AND INCREASING VISIBILITY

High pressure is building over the region and is bringing 
clear skies and above normal temperatures.  Low clouds and 
fog from Jose lingered through the morning, but the 10:00AM 
EST observation saw visibility improve to 70 miles for the 
first time in over a week. Skies were mostly clear by early 
afternoon.  As remnants from Jose moves farther southeast, 
wind speeds have decreased to 7 mph and wind direction has 
become more easterly.  Temperatures had risen to a max. of 
74F at BHO by 1:00PM, and some areas in the region had already 
measured over 80F by the early afternoon.


Today's Observations:

7 A.M.
Weather: Overcast stratus, fog N-NE
Temperature: 60F; Dew Point: 60F; Wind: N at 11G18 kts
Sea-level pressure: 30.02 ins. Hg, rising, then more quickly
Visibility: 10 miles, except 4 miles N-NE and 15 miles NW, 
distant fog ENE-NNW
6-hr Max temp: 60F
6-hr Min temp: 59F
24-hr precip: 0.63 in.
BHO SA 1155 E4 OVC 10 166/60/60/0111G18/002/ VSBY N-NE 4 
NW 15 FG N-NE DSNT FG ENE-NNW/ 8/6// 53005 MANUAL 70063 
ASOS 70066 10060 20059

10 A.M.
Weather: Overcast stratus
Temperature: 65F; Dew Point: 60F; Wind: N at 7 kts
Sea-level pressure: 30.06 ins. Hg, rising, then less quickly
Visibility: 70 miles, except 60 miles ESE, distant fog NE-S
BHO SA 1455 E11 OVC 70 180/65/60/3607/006/ VSBY ESE 60 
DSNT FG NE-S/ 8/6// 51014

1 P.M. 
Weather: Few cumulus S-N, few stratocumulus E-S, few cirrus W-NE
Temperature: 73F; Dew Point: 62F; Wind: ENE at 7 kts
Sea-level pressure: 30.04 ins. Hg, falling, then more slowly
Visibility: 70 miles, except 60 miles SE-S
6-hr Max temp: 74F 
6-hr Min temp: 59F
BHO SA 1755 CLR 70 173/73/62/0607/004/ FEW CU S-N FEW SC E-S
FEW CI W-NE VSBY SE-S 60/ 8/501 56007 10074 20059


SUMMARY FOR FRIDAY, SEPTEMBER 22, 2017
 
TEMPERATURE (DEGREES F)
MAX.....60   NORMAL.....69
MIN.....54   NORMAL.....52
MEAN....57   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL.........................-4
TOTAL DEPARTURE FOR THE MONTH........................+19 [+0.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH..............58   DEPARTURE..........+5
TOTAL COOLING UNITS FOR THE SEASON............665   DEPARTURE.........+75
TOTAL COOLING UNITS LAST SEASON TO DATE.......892   DEPARTURE........-227

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............8   DEPARTURE..........+3
TOTAL HEATING UNITS FOR THE MONTH..............42   DEPARTURE.........-20
TOTAL HEATING UNITS FOR THE SEASON.............68   DEPARTURE.........-19
TOTAL HEATING UNITS LAST SEASON TO DATE........17   DEPARTURE.........+51

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................40 NNE AT 12:45 A.M.
                   AERO........................38 NNE AT 12:45 A.M.
                   ASOS........................41  N  AT  8:49 A.M.
                   DAVIS.......................36  N  AT 12:45 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................26  N  AT  8:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................26 NNE AT 12:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................25  N  AT 12:46 A.M.
AVERAGE WIND SPEED AND DIRECTION.............19.0 NNE
                   ASOS......................18.6
                   DAVIS.....................16.7  N [013 DEG.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.63  DEPARTURE......+0.48
                         ASOS..............0.66
TOTAL PRECIPITATION FOR THE MONTH..........3.17  DEPARTURE......+0.29
                         ASOS..............3.24
TOTAL PRECIPITATION FOR THE YEAR..........39.53  DEPARTURE......+1.63
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings


PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

9/1  68/47/58/-10/0.00/749/95              26 WNW AERO 28 WNW RMY 31
9/2  72/46/59/-9/0.00/542/69               18 NNW AERO 18 NNW RMY 21
9/3  63/52/58/-9/0.24/000/00               33 W   AERO 33 W   RMY 37
9/4  79/55/67/0/0.00/702/90                29 SSW AERO 28 SSW RMY N/A
9/5  84/62/73/+6/0.00/583/75               36 S   AERO 32 S   RMY 38
9/6  76/59/68/+1/0.49/070/09               28 S   AERO 28 S   RMY 30 TSTM
9/7  74/58/66/0/0.79/417/54                24*WSW AERO 23 WSW RMY 24 
9/8  74/53/64/-2/0.00/577/75               21 WSW AERO 18 WSW RMY 22
9/9  68/51/60/-5/T/620/81                  18 ENE AERO 16 ENE RMY 18
9/10 71/51/61/-4/0.00/694/91               18 NW  AERO 16 NW  RMY N/A
9/11 78/50/64/-1/0.00/692/91               20 NNW AERO 17 NNW RMY 20
9/12 84/58/71/+6/0.00/690/91               22 WSW AERO 18 WSW RMY 23
9/13 84/59/72/+8/T/680/90                  18 WSW AERO 15 WSW RMY 20 TSTM
9/14 82/66/74/+10/0.00/233/31              23 SW  AERO 23 WSW RMY 25 TSTM
9/15 83/66/75/+11/0.05/300/40              18 WNW AERO 15 WNW RMY 18
9/16 78/65/72/+9/T/.../..                  14 E   AERO  9 E   RMY 12
9/17 79/61/70/+7/T/.../..                  15 SSE AERO 14 SSE RMY 15
9/18 67/62/65/+3/..../.../..               21 NE  AERO 18 NE  RMY N/A
9/19 63/61/62/0/..../.../..                28 NE* AERO 25 NNE RMY N/A
9/20 68/62/65/+3/..../.../..               41 NNE AERO 44 NNE RMY 45
9/21 69/60/65/+4/..../.../..               47 NNE AERO 44 NNE RMY 50
9/22 60/54/57/-4/..../.../..               40 NNE AERO 38 NNE RMY N/A

9/23 Low temp since midnight is 59F; normal low is now 52F

DAILY RECORDS FOR SEPTEMBER

9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
        TIES PREVIOUS RECORD SET IN 1975

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):      

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

TODAY'S REPORT PREPARED BY: Cecilia Borries-Strigle