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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 24, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLEAR, CALM DAY TODAY WITH TEMPERATURES CLOSER TO AVERAGE

Thanksgiving was a chilly day at Blue Hill this year, with a high temperature
of only 40F and a mean temperature for the day of 33F, six degrees below
normal.  Today, light SW winds are slowly advecting warmer air into the
region.  The temperature had risen up to 47F by 1:00 P.M., which would be
exactly normal for today's date.  Skies have been mainly clear with just
a few high clouds and no precipitation in the area.  Visibility is running
a little lower than yesterday, around 50-60 miles.

Today's Observations:

7 A.M.
Weather: Clear, few cirrus all quadrants except NNW-NE
Temperature: 32F; Dew Point: 22F; Wind: SW at 9 kts
Sea-level pressure: 30.01 ins. Hg, rising 
Visibility: 60 miles, distant haze
6-hr Max temp: 32F
6-hr Min temp: 29F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 60 164/32/22/2309/001/ FEW CI ALQDS XCPT NNW-NE DSNT HZ/ 
8/001 52011 10032 20029

10 A.M.
Weather: Clear, few cirrus distant E-SSE and SW-N
Temperature: 38F; Dew Point: 23F; Wind: WSW at 6 kts
Sea-level pressure: 30.03 ins. Hg, rising then steady
Visibility: 50 miles, distant haze
3-hr precip: 0.00 ins. 
BHO SA 1455 CLR 50 169/38/23/2506/003/ FEW CI DSNT E-SSE AMD SW-N DSNT HZ/ 
8/001 51005

1 P.M.
Weather: Clear, few dense cirrus distant W-N, few cirrus overhead
Temperature: 47F; Dew Point: 25F; Wind: SSW at 8 kts
Sea-level pressure: 29.98 ins. Hg, steady then falling 
Visibility: 60 miles, distant haze
6-hr Max temp: 47F
6-hr Min temp: 32F
6-hr precip: 0.00 ins.
BHO SA 1755 CLR 60 152/47/25/2008/998/ FEW DNS CI DSNT W-N FEW CI OVHD 
DSNT HZ/ 8/002 58017 10047 20032

SUMMARY FOR THURSDAY, NOVEMBER 23, 2017
 
TEMPERATURE (DEGREES F)
MAX.....40   NORMAL.....47
MIN.....26   NORMAL.....31
MEAN....33   NORMAL.....39

DEPARTURE FROM 30-YEAR NORMAL..........................-6
TOTAL DEPARTURE FOR THE MONTH..........................-12 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY............32   DEPARTURE..........+6
TOTAL HEATING UNITS FOR THE MONTH...........520   DEPARTURE.........+12
TOTAL HEATING UNITS FOR THE SEASON..........788   DEPARTURE........-282
TOTAL HEATING UNITS LAST SEASON TO DATE.....864   DIFFERENCE........-76

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................26 NW  AT 1:44 A.M. 
                   AERO........................25 NW  AT 2:12 A.M.
                   ASOS........................27 NW  AT 1:45 A.M.
                   DAVIS.......................26 NW  AT 1:44 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................18 NW  AT 1:43 A.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE..................18 WNW AT 1:43 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................18 NW  AT 1:43 A.M.
AVERAGE WIND SPEED AND DIRECTION..............9.4 WNW
                   ASOS.......................9.4
                   DAVIS......................9.0 WNW [303 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.04  DEPARTURE......-1.59
                         ASOS..............2.00
TOTAL PRECIPITATION FOR THE YEAR..........49.84  DEPARTURE......+2.44
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings 

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/1  53/39/46/0/0.00/167/27           25 SE  AERO 24 SE  RMY 25
11/2  71/49/60/+14/0.00/000/00         28 SSE AERO 25 SSE RMY 27
11/3  74/47/61/+15/T/350/57            35 WNW AERO 35 WNW RMY 38 
11/4  54/39/47/+2/0.00/545/89          31 NW  AERO 31 NW  RMY N/A 
11/5  61/46/54/+9/0.01/006/01          26 S   AERO 24 S   RMY N/A
11/6  64/47/56/+11/0.05/000/00         32 S   AERO 28 SSW RMY 35
11/7  46/35/41/-4/0.11/145/24          26 NNW AERO 23 N   RMY 26
11/8  43/34/39/-5/0.08/295/49          26 N   AERO 23 N   RMY 27 
11/9  50/31/41/-3/0.01/480/80          25 S   AERO 23 S   RMY N/A 
11/10 45/20/33/-11/0.00/586/98         46 WNW AER0 44 WNW RMY 46 
11/11 36/18/27/-16/0.00/589/99         28 WNW AERO 26 WNW RMY 28 
11/12 44/27/36/-7/0.00/302/51          13 E   AERO  9 S   RMY 14
11/13 40/35/38/-5/..../000/00          20 NNW AERO 17 NNW RMY 20
11/14 40/33/37/-5/..../000/00          18 N   AERO 15 N   RMY 18
11/15 43/31/37/-5/0.00/417/71          20 NE  AERO 15 NE  RMY N/A
11/16 51/37/44/+2/..../012/02          32 SE  AERO 32 SE  RMY N/A TSTM
11/17 42/30/36/-5/0.00/.../..          41 WNW AERO 43 WNW RMY 47
11/18 49/26/38/-3/..../.../..          35 SSW AERO 35 SSW RMY 39
11/19 58/34/46/+5/..../.../..          50 W   AERO 50 W   RMY 54
11/20 39/31/35/-5/0.00/.../..          48 WNW AERO 50 WNW RMY 44 
11/21 57/35/46/+6/.../.../..           46 SSW AERO 46 SSW RMY 48 
11/22 53/35/44/+4/.../.../..           37 NW  AERO 38 NW  RMY 41 
11/23 40/26/33/-6/0.00/.../..          26 NW  AERO 25 NW  RMY N/A 

11/24 Low temp since midnight is 29F; normal low is now 31F

DAILY RECORDS FOR NOVEMBER 2017

11/10/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 20F,
          TIES WITH PREVIOUS RECORD SET IN 2004

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

RECORDS FOR NOVEMBER 24
HIGH 69 IN 1931
LOW 7 IN 1897
PRECIP 1.76 INCHES IN 1901
SNOWFALL 4.5 INS IN 1936
PEAK GUST 69 SSW IN 1959

RECORDS FOR NOVEMBER 25
HIGH 71 IN 1979
LOW 13 IN 1938
PRECIP 3.10 INCHES IN 1983
SNOWFALL 8.0 INS IN 1888
PEAK GUST 94e E IN 1950

TODAY'S REPORT PREPARED BY: Jonathan O'Brien