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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 23, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

PERSISTING NW WINDS USHER IN RECORD SETTING LOWS....

Northwest winds over the past few days have dropped temperatures to 
extreme levels, with yesterday's minimum of 9F the coldest on record 
for the day.  This also proved to be the coldest Thanksgiving on record.  
The min of 9F on Thanksgiving morning also goes down as the second 
earliest single digit temperature ever recorded at BHO.  Additionally, 
yesterday's maximum temperature of 20F is the coldest maximum temperature 
observed this early in the season.  This morning's low of 9F is tied for 
today's record low, matching the low of 9F in 1888. Today, winds 
shifting southwesterly combined with subsiding intensity have enabled 
greater heating throughout the day, with a high temperature of 
28F reached by the time of the 1 P.M. observation. This is still well 
below seasonal averages, but it does bring temperatures away from the 
record setting values.  Cold dry air continues to enable pristine 
visibility, with 90 miles observed this morning, and high pressure 
continuing to enforce clear skies throughout the observation period.

BHO Coldest Thanksgiving Day (Max/Min/Mean Temperature), deg F (1885-2018):

1) 20/9/15  on 22 November, 2018     (Low max and low min records for date)
2) 21/10/16 on 28 November, 1901     (Low max and low min records for date)
3) 22/14/18 on 29 November, 1894     (Low max record for date)
4) 25/11/18 on 26 November, 1903     (Low max record for date)
5) 27/13/20 on 28 November, 2002
6) 26/16/21 on 27 November, 1890
   29/13/21 on 23 November, 1972
   27/14/21 on 28 November, 1996

Today's Observations:

7 A.M.
Weather: Clear, few distant cumulus NE-S  
Temperature: 10F; Dew Point: 0F; Wind: NW at 11G16 kts  
Sea-level pressure: 30.52 ins. Hg, rising steadily      
Visibility: 90 miles
6-hr Max temp: 10F
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 80 336/10/00/3111G16/052/ 
FEW DSNT CU NE-S/ 8/100 53007 10010 20009  

10 A.M.
Weather: Clear, few distant cumulus NE-S
Temperature: 20F; Dew Point: 4F; Wind: NW at 09G13 kts,   
Sea-level pressure: 30.53 ins. Hg, steady
Visibility: 90 miles
3-hr Precip: 0.00 ins. 
3-hr snowfall: 0.0 ins. 
BHO SA 1455 CLR 80 337/20/04/3109G13/053/ FEW DSNT CU NE-S/ 8/100 

1 P.M.
Weather: Clear, few distant cumulus NE-S, few distant altocumulus N  
Temperature: 27F; Dew Point: -6F; Wind: WSW at 5 kts  
Sea-level pressure: 30.46 ins. Hg, falling steadily      
Visibility: 80 miles
6-hr Max temp: 28F
6-hr Min temp:  10F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.   
BHO SA 1755 CLR 90 314/27/-6/2405/046/ 
FEW DSNT CU NE-S FEW DSNT AC N/ 8/150 58023 10028 20010
 
SUMMARY FOR THURSDAY, NOVEMBER 22, 2018 

TEMPERATURE (DEGREES F)
MAX.....20   NORMAL.....48
MIN......9   NORMAL.....32
MEAN....15   NORMAL.....40

DEPARTURE FROM 30-YEAR NORMAL.......................-25
TOTAL DEPARTURE FOR THE MONTH.......................-56 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............50   DEPARTURE........+25
TOTAL HEATING UNITS FOR THE MONTH.............538   DEPARTURE........+56
TOTAL HEATING UNITS FOR THE SEASON...........1082   DEPARTURE........+37
TOTAL HEATING UNITS LAST SEASON TO DATE.......756   DIFFERENCE......+326

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................36 NW   AT  9:59 A.M.
                   AERO.........................41 NW   AT 10:38 A.M. 
                   ASOS.........................39 NW   AT 10:16 A.M. 
                   DAVIS........................40 NW   AT 10:15 A.M. RMY 42
FASTEST MILE FOR YESTERDAY......................29 NW   AT 10:10 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................29 NW   AT 10:40 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................31 NW   AT 10:40 A.M.
AVERAGE WIND SPEED AND DIRECTION..............18.7 NW
                   ASOS.......................17.1
                   DAVIS......................18.6 NW [316 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..........7.87  DEPARTURE.......+4.41
                         ASOS..............8.19 
TOTAL PRECIPITATION FOR THE YEAR..........60.91  DEPARTURE......+13.86
                         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........+6.5
TOTAL SNOWFALL FOR THE SEASON...............7.6  DEPARTURE........+6.2


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 20/9/15/-25/..../.../..          36 NW  AERO 41 NW  RMY 42

11/23 Low temp since midnight is 9F; normal low is 31F

DAILY RECORDS FOR NOVEMBER 2017

11/22/18: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
          BREAKS PREVIOUS RECORD OF 26F SET IN 1972 and 2008
11/22/18: DAILY RECORD LOW MINIMUM TEMPERATURE OF 9F,
          BREAKS 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 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

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

TODAY'S REPORT PREPARED BY: Nate Iannuccillo