Saturday, December 3, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 3, 2016

COLDER AIR AND GREATER WINDS AS STRATOCUMULUS MOVE IN

Temperatures today remained cooler than the previous days, with a low
of 34 overnight and a high reaching 43 by the 1:00PM EST observation.
Dew points remained in the mid 20s. Winds began to increase out of the
WNW with a peak gust of 37 mph at 2:20AM. Cloud cover also increased
throughout the day, with overcast stratocumulus at 1:00PM. Visibility
was great at up to 75 miles. Pressure has been steadily increasing
since the low pressure system moved offshore.

PRELIMINARY STATS FOR NOVEMBER 2016

TEMPERATURE, Deg. F
Avg. Max. 52.8 [+2.8] Avg. Min. 36.3 [+2.8] Mean      44.6 [+2.9] 24-hour corrected mean: 44.0
Max. for month: 69F on 2nd
Min. for month: 28F on 21st, 22nd, 23rd, 28th

HEATING DEGREE DAYS
Total heating units: 609 [-89] Total for the season: 1030 [-231] Total for last season: 1002

PRECIPITATION, Inches
Total: 2.61 [-2.15] Greatest in 24 hrs: 1.27 in. on 15th-16th

WIND, mph
Avg. uncorrected wind speed: 11.4
Avg. corrected wind speed: 11.9
Prevailing wind direction: NW at 17%
Peak gust and direction: 45 ESE on 29th

SUNSHINE:
Campbell-Stokes card minutes: 9012 mins. of possible 17010 mins. or 53%
Astronomical total minutes: 9315 mins. of possible 17593 mins. or 53%

7 A.M.
Weather: Few distant stratocumulus, scattered alto cumulus
Temperature: 35F; Dew Point: 26F; Wind: WNW at 13G21 kts
Sea-level pressure: 29.82 ins. Hg, rising, then more quickly
Visibility: 75 miles, except 65 miles WNW-NW
6-hr Max temp: 39F
6-hr Min temp: 34F
24-hr precip: 0.00 in.
BHO SA 1155 90 SCT 75 097/35/26/2913G21/982/ FEW SC DSNT ALQDS FEW ACSL
NE-SE VSBY WNW-NW 65/ 8/530 53015 10039 20034

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus
Temperature: 40F; Dew Point: 26F; Wind: NW at 16G25 kts,
Peak Wind: 29 kts NW at 9:34AM
Sea-level pressure: 29.87 ins. Hg, rising then less quickly
Visibility: 75 miles, except 65 miles WNW-NW
BHO SA 1455 40 SCT 120 SCT 75 114/40/26/3116G25/987/ VSBY WNW-NW 65 PK
WND 3129/34/ 8/430 51017

1 P.M.
Weather: Overcast stratocumulus, breaks in overcast in all directions,
visible higher clouds S
Temperature: 42F; Dew Point: 24F; Wind: WNW at 19G29 kts
Sea-level pressure: 29.87 ins. Hg, rising, then falling
Visibility: 75 miles
6-hr Max temp: 43F
6-hr Min temp: 35F
BHO SA 1755 E40 OVC 75 116/42/24/3019G29/987/ BINOVC ALQDS HIR CLDS VSBL
S PK WND 3031/42/ 8/57/ 50002 10043 20035

SUMMARY FOR FRIDAY, DECEMBER 2, 2016

TEMPERATURE (DEGREES F)
MAX…..48   NORMAL…..44
MIN…..34   NORMAL…..28
MEAN….41   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL……………………+5
TOTAL DEPARTURE FOR THE MONTH…………………..+15 [+7.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..24   DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE MONTH…………..42   DEPARTURE………-16
TOTAL HEATING UNITS FOR THE SEASON………..1072   DEPARTURE……..-247
TOTAL HEATING UNITS LAST SEASON TO DATE……1051   DIFFERENCE……..+21

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 W   AT  2:11 P.M.*
ASOS……………………33 W   AT  1:42 P.M.
DAVIS…………………..30 WSW AT  1:42 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………25 W   AT  2:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 W   AT  2:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..22 WSW AT  2:11 P.M.
AVERAGE WIND SPEED AND DIRECTION………….15.0 WSW
ASOS………………….15.0
DAVIS…………………12.9 WSW [240 Deg.] *last of multiple occurrences

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……….0.20  DEPARTURE……-0.12
ASOS…………..0.21
TOTAL PRECIPITATION FOR THE YEAR……….37.17  DEPARTURE…..-11.68
ASOS………….37.64

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE SEASON………….Trace  DEPARTURE…….-3.1

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  55/29/42/-4/0.00/0.0/600/97           22 SSE AERO 22 S   RMY N/A
11/2  69/45/57/+11/0.00/0.0/425/69          24 SSW AERO 24 S   RMY 26
11/3  65/49/57/+11/0.01/0.0/025/04          38 W   AERO 41 W   RMY 38
11/4  56/35/46/+1/0.00/0.0/587/96           26 NW  AERO 26 NW  RMY 30
11/5  55/32/44/-1/0.00/0.0/250/41           24 W   AERO 23 W   RMY 24
11/6  49/39/44/-1/0.04/T/091/15             23 N   AERO 23 N   RMY 23
11/7  46/33/40/-5/0.00/0.0/423/70           21 N   AERO 21 N   RMY 20
11/8  64/36/50/+6/0.00/0.0/590/98           17 W   AERO 15 SSW RMY N/A
11/9  60/43/52/+8/T/0.0/090/15              22 NNW AERO 22 NW  RMY N/A
11/10 52/34/43/-1/0.00/0.0/507/85           28 SSW AERO 30 SSW RMY 31
11/11 59/35/47/+4/0.00/0.0/565/95           39 NW  AERO 44 NW  RMY 45
11/12 47/31/39/-4/0.00/0.0/569/96           38 NW  AERO 44 NW  RMY 23
11/13 59/37/48/+5/0.00/0.0/519/88           23 W   AERO 22 W   RMY N/A
11/14 66/44/55/+13/0.00/0.0/547/93          24 WSW AERO 22 WSW RMY 25
11/15 57/46/52/+10/1.23/0.0/000/00          32 ENE AERO 33 ENE RMY 35
11/16 57/45/51/+9/0.04/0.0/000/00           26 W   AERO 25 W   RMY 28
11/17 55/41/48/+7/0.00/0.0/169/29           25 WNW AERO 29 NW  RMY 29
11/18 60/38/49/+8/0.00/0.0/580/100          21 NNE AERO 22 N   RMY 23
11/19 53/40/47/+6/0.02/0.0/445/77           18 ENE AERO 18 ENE RMY N/A
11/20 46/29/38/-2/0.04/0.0/006/01           37 SW* AERO 40 SW  RMY N/A
11/21 36/28/32/-8/T/T/138/24                40 W   AERO 44 W   RMY 44
11/22 41/28/35/-5/0.00/0.0/555/97           35 W   AERO 37 W   RMY 36
11/23 43/28/36/-3/0.00/0.0/542/95           32 WNW AERO 33 WNW RMY N/A
11/24 41/29/35/-4/0.05/T/000/00             15 NNE AERO 13 NNE RMY N/A
11/25 46/38/42/+3/0.08/0.0/000/00           24 SE  AERO 23 SE  RMY 25
11/26 45/36/41/+3/0.00/0.0/085/15           18 NW  AERO 17 NW  RMY 28
11/27 44/30/37/-1/0.00/0.0/451/80           26 W   AERO 26 WNW RMY 29
11/28 44/28/36/-2/0.00/0.0/556/99           22 WNW AERO 21 WNW RMY 22
11/29 57/37/47/+10/0.46/0.0/000/00          45 ESE AERO 47 SSE*RMY 47
11/30 57/45/51/+14/0.64/0.0/000/00          32 ENE AERO 33 E   RMY 31

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

12/1  55/39/47/+10/0.20/0.0/000/00          36 W   AERO 37 W   RMY 36
12/2  48/34/41/+5/0.00/0.0/…/..           32 W   AERO 32 W   RMY N/A

12/3  Low temp since midnight is 34F; normal low is now 28F

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

RECORDS FOR DECEMBER 3
HIGH 67 IN 2009
LOW  -1 IN 1890
PRECIP 2.10 INS. IN 1986
SNOWFALL 6.0 INS. IN 1963
PEAK GUST 73e MPH W IN 1942

RECORDS FOR DECEMBER 4
HIGH 67 IN 1998
LOW -4 IN 1940
PRECIP 1.87 INS. IN 1968
SNOWFALL 6.0 INS. IN 1907
PEAK GUST 73 MPH WNW IN 1980

TODAY’S REPORT PREPARED BY: Lizzy Suzedell