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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 15, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST SKIES AND COLD NORTHERLY AIR...

Today's weather has seen altostratus dominate
cloud activity throughout the observation period,
providing an overcast layer that has significantly limited 
effects of radiational heating.  The continued presence
of northwesterly winds has kept temperatures well below 
normal, with a low of 19F recorded in the early hours of
the day. This is 15 degrees below the daily average, and just
four degrees above the daily record low of 15F set in 1933.   
Wind speeds have dropped significantly since yesterday, 
where several anemometers registered gusts up to 50 MPH; 
since then, winds have approached zero at different points 
this morning.  Pressure continues to lower at a steady 
and gradual rate, right through the time of the 1 P.M. observation.  
If this trend continues, it should enforce cloud cover
and potentially encourage precipitation for the evening hours.


PRELIMINARY STATS FOR OCTOBER 2018

TEMPERATURE, Deg. F
Avg. Max. 58.0 [-2.3]
Avg. Min. 42.7 [-0.2]
Mean 50.4 [-1.2]
24-hour corrected mean: 50.2
Max. for month: 82F on the 10th
Min. for month: 27F on the 22nd and 26th

HEATING DEGREE DAYS
Total heating units: 457 [+36]
Total for the season: 544 [-19]
Total for last season: 268

PRECIPITATION, Inches
Total: 5.85 in. [+1.16]
Greatest in 24 hrs: 2.08 inches on October 27

WIND, mph
Avg. uncorrected wind speed: 11.6 mph
Avg. corrected wind speed: 12.0
Prevailing wind direction: W [14% of total hours]
Peak gust and direction: 54 NE 

SUNSHINE:
Campbell-Stokes card minutes: 7800 minutes of possible 19824 or 39%
Astronomical total minutes: 8090 minutes of possible 20544 or 39%

Today's Observations:

7 A.M.
Weather: Overcast altostratus, few cumulus NE-SE 
Temperature: 19F; Dew Point: 9F; Wind: W at 6 kts  
Sea-level pressure: 30.60 ins. Hg, falling slightly      
Visibility: 70 miles
6-hr Max temp: 20F
6-hr Min temp: 19F
24-hr Precip: 0.00 ins.   
BHO SA 1155 E200 OVC 70 361/19/09/3306/060/ 
FEW CU NE-SE/ 8/11/ 58001 10020 20019

10 A.M.
Weather: Overcast altostratus, few stratocumulus NE-SE
Temperature: 23F; Dew Point: 11F; Wind: N at 3 kts,
light and variable   
Sea-level pressure: 30.60 ins. Hg, steady 
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E190 OVC 70 363/23/11/3403/060/ 
FEW SC NE–SE WND L/V/ 8/41/ 50002

1 P.M.
Weather: Overcast altostratus, few stratocumulus NE-SW 
Temperature: 28F; Dew Point: 16F; Wind: N at 3 kts, 
light and variable
Sea-level pressure: 30.54 ins. Hg, falling steadily   
Visibility: 70 miles
6-hr Max temp: 28F
6-hr Min temp: 19F 
6-hr Precip: 0.00 ins.
BHO SA 1755 E190 OVC 70 341/28/16/3603/054/ 
FEW SC NE-SW WND L/V/ 8/41/ 58022 10028 20019

 
SUMMARY FOR WEDNESDAY, NOVEMBER 14, 2018 

TEMPERATURE (DEGREES F)
MAX.....37   NORMAL.....51
MIN.....20   NORMAL.....34
MEAN....29   NORMAL.....42

DEPARTURE FROM 30-YEAR NORMAL......................-13
TOTAL DEPARTURE FOR THE MONTH......................+19 [+1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............36   DEPARTURE........+13
TOTAL HEATING UNITS FOR THE MONTH.............270   DEPARTURE........-19
TOTAL HEATING UNITS FOR THE SEASON............814   DEPARTURE........-38
TOTAL HEATING UNITS LAST SEASON TO DATE.......562   DIFFERENCE......+252

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................45 WNW AT  9:08 A.M.
                   AERO.........................50 WNW AT  9:04 A.M. 
                   ASOS.........................49 WNW AT  9:08 A.M. 
                   DAVIS........................50 W   AT  9:08 A.M. RMY 50
FASTEST MILE FOR YESTERDAY......................38 WNW AT  8:52 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................36 WNW AT  9:01 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................36 WNW AT  9:01 A.M.
AVERAGE WIND SPEED AND DIRECTION..............17.0 WNW
                   ASOS.......................15.7  
                   DAVIS......................16.9 NW [311 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..........5.98  DEPARTURE.......+3.63
                         ASOS..............6.22 
TOTAL PRECIPITATION FOR THE YEAR..........59.02  DEPARTURE......+13.08
                         ASOS.............61.08 


PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01 65/53/59/+2/0.22/042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/0.77/000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/0.33/000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/0.00/209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/0.00/638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/0.05/076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/0.03/000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/0.00/211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/0.00/496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/0.78/000/00        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/0.31/182/27         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/0.17/114/17         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/0.00/127/19         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/0.06/033/05         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/0.03/622/94         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/0.01/587/89         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/0.00/657/100       32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/0.00/602/92         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/0.00/228/35         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/0.02/363/56        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/0.00/497/77        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/0.51/103/16         29 WNW AERO 29 WNW RMY 29  TSTM
10/24 45/35/40/-9/0.03/096/15         31 NW  AERO 31 NW  RMY 32 
10/25 48/32/40/-9/0.00/510/80         35 NW  AERO 35 NW  RMY 36
10/26 45/27/36/-12/0.00/610/96        20 NW  AERO 19 NW  RMY N/A
10/27 48/38/43/-5/2.08/000/00         54 NE  AERO 55 NE  RMY 55
10/28 51/40/46/-2/0.07/000/00         23 NNE AERO 23 NNE RMY N/A TSTM
10/29 55/40/48/+1/0.37/138/22         30 WSW AERO 30 WSW RMY 34
10/30 45/34/40/-7/0.00/306/49         28 NW  AERO 28 NW  RMY 30
10/31 55/32/44/-3/0.01/367/59         35 SSW AERO 36 SSW RMY 37

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
           BREAKS PREVIOUS RECORD OF 62F SET IN 1949


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/..../148/24          59 W   AERO 60 W   RMY 58
11/04 52/37/45/0/..../588/96           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/..../.../..          29 SSW AERO 29 SSW RMY 31
11/07 60/50/55/+10/..../.../..         30 WSW AERO 30 WSW RMY 32
11/08 52/37/45/+1/..../.../..          29 WNW AERO 26 WNW RMY 23
11/09 48/34/41/-3/..../.../..          43 E   AERO 40 E   RMY 42
11/10 45/32/39/-5/..../.../..          45 W   AERO 47 WNW RMY 46
11/11 43/30/37/-6/0.00/.../..          32 WNW AERO 30 W   RMY 32
11/12 48/27/38/-5/0.00/.../..          18 SW  AERO 18 SW  RMY N/A
11/13 52/37/45/+2/..../.../..          44 WNW AERO 44 WNW RMY 48
11/14 37/20/29/-13/..../.../..         45 WNW AERO 50 WNW RMY 50

11/15 Low temp since midnight is 19F; normal low is 34F

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

RECORDS FOR NOVEMBER 15
HIGH 74 IN 1993
LOW 15 IN 1933
PRECIP 1.66 INCHES IN 1981
SNOWFALL 4.0 IN 1967
PEAK GUST 65 SSE IN 2008 

RECORDS FOR NOVEMBER 16
HIGH 73 IN 1927
LOW 8 IN 1933
PRECIP 2.25 INCHES IN 1981
SNOWFALL 2.0 IN 1913
PEAK GUST 78 S IN 1989

TODAY'S REPORT PREPARED BY: Nate Iannuccillo