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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 22, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

A COLD AND WINDY THANKSGIVING DAY ATOP 
GREAT BLUE HILL....

Visibility was 70 miles this morning, increasing to 
a perfect 90 miles by the 10 A.M observation. The 
snowfall overnight left .1 inches in the gauge at 7 A.M.
A northwesterly wind has increased since this morning, 
with frequent gusts at or above 30 mph. The maximum 
temperature reached so far today is 20F at midnight, 
which is 28 degrees below the daily normal of 48F. 
The daily record low maximum is 26F, set in 1972 and
1978. The low since midnight is 9F, 23 degrees below 
the daily normal minimum of 32F. This breaks the daily
record minimum of 12F, set in 1987. 


Today's Observations:

7 A.M.
Weather: Clear, few cumulus N-SW  
Temperature: 10F; Dew Point: -4F; Wind: WNW at 14G25 kts  
Sea-level pressure: 30.25 ins. Hg, rising steadily      
Visibility: 70 miles, thin smoke layer in all directions
6-hr Max temp: 17F
6-hr Min temp:  9F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.   
BHO SA 1155 CLR 70 245/10/-4/3014G25/025/ FEW CU N-SW 
THN K LYR ALQDS/ 8/100 51029 10017 20009 

10 A.M.
Weather: Scattered cumulus 
Temperature: 14F; Dew Point: -3F; Wind: NW at 21G31 kts,
Peak wind: 36 mph (31 kts) NW at 9:28 A.M.   
Sea-level pressure: 30.29 ins. Hg, falling then rising 
Visibility: 90 miles
3-hr Precip: 0.00 ins. 
3-hr snowfall: 0.0 ins. 
BHO SA 1455 40 SCT 90 258/14/-3/3121G31/029/ PK WND 3131/28/ 
8/100 50013

 
SUMMARY FOR WEDNESDAY, NOVEMBER 21, 2018 

TEMPERATURE (DEGREES F)
MAX.....39   NORMAL.....48
MIN.....20   NORMAL.....32
MEAN....30   NORMAL.....40

DEPARTURE FROM 30-YEAR NORMAL.......................-10
TOTAL DEPARTURE FOR THE MONTH.......................-31 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............35   DEPARTURE........+10
TOTAL HEATING UNITS FOR THE MONTH.............488   DEPARTURE........+31
TOTAL HEATING UNITS FOR THE SEASON...........1032   DEPARTURE........+12
TOTAL HEATING UNITS LAST SEASON TO DATE.......735   DIFFERENCE......+297

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................40 WNW  AT 6:47 P.M.
                   AERO.........................46 WNW  AT 7:44 P.M. 
                   ASOS.........................44 NW   AT 7:46 P.M. 
                   DAVIS........................47 NW   AT 6:47 P.M. RMY 47
FASTEST MILE FOR YESTERDAY......................34 WNW  AT 8:18 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................31 WNW  AT 8:16 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................34 WNW  AT 8:06 P.M.
AVERAGE WIND SPEED AND DIRECTION..............16.5 WNW
                   ASOS.......................15.7
                   DAVIS......................16.4 W [275 deg.]  

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.......-0.16
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........7.87  DEPARTURE.......+4.57
                         ASOS..............8.19 
TOTAL PRECIPITATION FOR THE YEAR..........60.91  DEPARTURE......+14.02
                         ASOS.............63.05

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........-0.1
TOTAL SNOWFALL FOR THE MONTH................7.6  DEPARTURE........+6.6
TOTAL SNOWFALL FOR THE SEASON...............7.6  DEPARTURE........+6.3


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

11/01 65/49/57/+11/..../006/01         25 SSW AERO 24 SSW RMY N/A
11/02 65/52/59/+13/..../000/00         37 SSW AERO 41 SSW RMY N/A
11/03 64/42/53/+7/..../144/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/..../570/96           31 W   AERO 30 W   RMY N/A
11/05 49/40/45/0/..../000/00           30 ENE AERO 29 ENE RMY 28
11/06 58/45/52/+7/..../000/00          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/..../456/98         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/..../234/78          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/..../000/00          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/..../576/100         45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/462/80          32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/000/00          18 SW  AERO 18 SW  RMY N/A
11/13 52/37/45/+2/..../458/80          44 WNW AERO 44 WNW RMY 48
11/14 37/20/29/-13/..../000/00         45 WNW AERO 50 WNW RMY 50
11/15 30/19/25/-17/..../.../..         33 E   AERO 36 E   RMY N/A
11/16 41/30/36/-6/..../.../..          43 E   AERO 44 ENE RMY N/A
11/17 45/34/40/-1/0.00/.../..          28 W   AERO 27 W   RMY 28
11/18 40/30/35/-6/0.00/.../..          21 W   AERO 21 W   RMY M
11/19 38/33/36/-5/..../.../..          16 E   AERO 14 E   RMY N/A
11/20 38/31/35/-5/..../.../..          30 NE  AERO 30 NE  RMY N/A
11/21 39/20/30/-10/..../.../..         40 WNW AERO 46 WNW RMY 47

11/22 Low temp since midnight is 9F; normal low is 32F

DAILY RECORDS FOR NOVEMBER 2017

11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
                PREVIOUS RECORD OF 12F SET IN 1987


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

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

RECORDS FOR NOVEMBER 23
HIGH 73 IN 1931
LOW 9 IN 1888
PRECIP 2.33 INS IN 2006
SNOWFALL 5.5 INS IN 1989
PEAK GUST 64e S IN 1953

TODAY'S REPORT PREPARED BY: Benjamin Turner