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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 22, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

RAINY AND GUSTY DAY AS JOSE LINGERS OFFSHORE 

An early morning rain storm left .15 inches of precip.
with rain continuing on and off all day. Another .16 
inches was measured by 1:00 PM EST. Winds now from 
the north have been consistently between 10-20 MPH with 
gust up to 40 MPH. Temperatures have not fluctuated much 
today and we observed only a 1 degree increase between 
7:00 AM EST and 1:00 PM EST.  
 
Skies remained overcast all day. A distant fog reduced 
prevailing visibility to 20 miles, with and increase in the 
fog to the north at 1:00 PM EST reducing the visibility 
around Boston to 5 miles. 

Today's Observations:

7 A.M.
Weather: Overcast Stratus 
Temperature: 55F; Dew Point: 53F; Wind: NNE at 16G25 kts,
Peak wind: 30 kts (35 MPH) NNE at 6:06 AM EST
Sea-level pressure: 30.01 ins. Hg,falling then rising 
Visibility: 20 miles distant fog in all directions
6-hr Max temp: 60F
6-hr Min temp: 54F
24-hr Precip:  0.15 in.
BHO SA 1155 E15 OVC 20 162/55/53/0216G25/001/ DSNT FG ALQDS 
PK WND 0230/06/ 8/6// 53005 MANUAL 70015 ASOS 70015 10060 
20054

10 A.M.
Weather: Light rain overcast stratus  
Temperature: 56F; Dew Point: 54F; Wind: N at 16G30 kts,
Peak wind: 32 kts (37 MPH) NNE at 9:41 AM EST
Sea-level pressure: 30.02 ins. Hg, rising unsteadily 
Visibility: 20 miles distant fog in all directions
3-hr Precip: Trace
BHO SA 1455 E15 OVC 20R- 165/56/54/0116G30/002/ DSNT FG ALQDS 
PK WND 0132/41/ 8/6// 52003 MANUAL 600//

1 P.M. 
Weather: Light rain overcast stratus   
Temperature: 56F; Dew Point: 55F; Wind: N at 15G26 kts,
Peak wind: 32 kts (37 MPH) NNE at 12:39 PM EST
Sea-level pressure: 30.01 ins. Hg, steady
Visibility: 20 miles with 5 miles to the N, distant fog 
in all directions
6-hr Max temp: 56F 
6-hr Min temp: 55F
6-hr Precip: 0.16 in. 
BHO SA 1755 E13 OVC 20R- 162/56/55/0115G26/001/ VSBY N 5 
DSNT FG ALQDS PK WND 0132/39/ 8/6// 58003 MANUAL 6016/ ASOS 
60017 10056 20055 

SUMMARY FOR THURSDAY, SEPTEMBER 21, 2017
 
TEMPERATURE (DEGREES F)
MAX.....69   NORMAL.....70
MIN.....60   NORMAL.....53
MEAN....65   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL.........................+4
TOTAL DEPARTURE FOR THE MONTH........................+23 [+1.1 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..........+6
TOTAL COOLING UNITS FOR THE SEASON............665   DEPARTURE.........+76
TOTAL COOLING UNITS LAST SEASON TO DATE.......884   DEPARTURE........-219

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-5
TOTAL HEATING UNITS FOR THE MONTH..............34   DEPARTURE.........-23
TOTAL HEATING UNITS FOR THE SEASON.............60   DEPARTURE.........-22
TOTAL HEATING UNITS LAST SEASON TO DATE........82   DEPARTURE.........+43

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................47 NNE AT 11:23 P.M.*
                   AERO........................44 NNE AT 12:44 P.M.
                   ASOS........................49 NE  AT 12:45 P.M.
                   DAVIS.......................43 N   AT 12:45 P.M. RMY 50
FASTEST MILE FOR YESTERDAY.....................27 NNE AT 12:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................28 NNE AT 11:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................26 NNE AT 12:46 P.M.
AVERAGE WIND SPEED AND DIRECTION.............19.7 NNE
                   ASOS......................19.3
                   DAVIS.....................15.6 NNE [018 DEG.]
*Last of multiple occurences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.15  DEPARTURE.......0.00
                         ASOS..............0.15
TOTAL PRECIPITATION FOR THE MONTH..........2.54  DEPARTURE......-0.19
                         ASOS..............2.58
TOTAL PRECIPITATION FOR THE YEAR..........38.90  DEPARTURE......+1.15
                         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

9/21 Low temp since midnight is 54F; 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 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989

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

TODAY'S REPORT PREPARED BY: Kaitlin Geagan