Friday, December 1, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 1, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER FOR THIS FIRST FRIDAY IN
DECEMBER….

An early morning rainstorm left 0.04 inches
on top of Great Blue Hill. We had a mild day
today with moderate winds, frequently gusting
over 20 kts (23 MPH) after 10:00 A.M. We started
the morning with thin ground fog with dense
patches SSE-W. The fog dissipated before 10:00 A.M.
Humidity dropped throughout the day allowing for
70 miles of visibility by 1:00 P.M.

November was drier than average with only 2.04
inches for the month. This is -2.72 inches below
normal. The month was cooler than our 30 year normal
but warmer than our 120 year normal. This month we
also observed one of the latest first frost seen on
top of Great Blue Hill.

PRELIMINARY STATS FOR NOVEMBER 2017

TEMPERATURE, Deg. F
Avg. Max. 49.8 [-0.2] Avg. Min. 32.9 [-0.6] Mean      41.4 [-0.3] 24-hour corrected mean: 41.7
Max. for month: 74F on 3rd
Min. for month: 18F on 11th

HEATING DEGREE DAYS
Total heating units: 701 [+3] Total for the season: 969 [-292] Total for last season: 1030

PRECIPITATION, Inches
Total: 2.04 [-2.72] Greatest in 24 hrs: 0.87 in. on the 22nd

WIND, mph
Avg. uncorrected wind speed: 12.7
Avg. corrected wind speed: 13.0
Prevailing wind direction: WNW at 12%
Peak gust and direction: 50 W on 19th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Broken stratus, broken altocumulus, thin
ground fog with dense patches SSE-W
Temperature: 42F; Dew Point: 42F; Wind: WNW at 7 kts
Sea-level pressure: 30.09 ins. Hg, rising steadily
Visibility: 45 miles, distant fog in all directions
6-hr Max temp: 45F
6-hr Min temp: 42F
24-hr precip: 0.04 ins.
BHO SA 1155 E55 BKN 75 BKN 45 188/42/42/2907/009/ THN GF
ALQDS FEW DNS PTCHS GF SSE-W DSNT FG ALQDS/ 8/630 52015
MANUAL 70004 ASOS 70004 10045 20042

10 A.M.
Weather: Scattered altocumulus, few distant cumulus
WSW-W
Temperature: 46F; Dew Point: 38F; Wind: WNW at 8G18 kts
Sea-level pressure: 30.14 ins. Hg, rising steadily
Visibility: 70 miles
3-hr precip: 0.00 ins.
BHO SA 1455 70 SCT 70 207/46/38/3008G18/014/ FEW CU DSNT
WSW-W/ 8/130 51019

1 P.M.
Weather: Scattered cumulus, broken stratocumulus
Temperature: 48F; Dew Point: 32F; Wind: NW at 11G21 kts
Sea-level pressure: 30.14 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 50F
6-hr Min temp: 42F
6-hr precip: 0.00 ins.
BHO SA 1755 40 SCT 60 BKN 70 205/48/32/3211G21/014/ 8/800
55002 10050 20042

SUMMARY FOR THURSDAY, NOVEMBER 30, 2017

TEMPERATURE (DEGREES F)
MAX…..43   NORMAL…..45
MIN…..26   NORMAL…..29
MEAN….35   NORMAL…..37

DEPARTURE FROM 30-YEAR NORMAL………………………-2
TOTAL DEPARTURE FOR THE MONTH………………………-4 [-0.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………30  DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH………..701  DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE SEASON……….969  DEPARTURE……..-292
TOTAL HEATING UNITS LAST SEASON TO DATE….1030  DIFFERENCE……..-61

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 SSE AT 10:16 P.M.
AERO……………………25 NNW AT 12:26 A.M.
ASOS……………………26 S   AT 10:16 P.M.
DAVIS…………………..24 N   AT 12:26 A.M. RMY 25
FASTEST MILE FOR YESTERDAY…………………18 SSE AT 10:16 P.M.**
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 N   AT  9:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 SSE AT  1:01 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.8 SSE
ASOS………………….10.3
DAVIS………………….9.3 SSE [166 DEG.] ** ESTIMATED
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.12
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….2.04  DEPARTURE……-2.72
ASOS…………..2.00
TOTAL PRECIPITATION FOR THE YEAR……….49.88  DEPARTURE……+1.35
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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…….-2.3
TOTAL SNOWFALL FOR THE SEASON……………0.0  DEPARTURE…….-2.6

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 53/39/46/0/0.00/167/27           25 SE  AERO 24 SE  RMY 25
11/02 71/49/60/+14/0.00/000/00         28 SSE AERO 25 SSE RMY 27
11/03 74/47/61/+15/T/350/57            35 WNW AERO 35 WNW RMY 38
11/04 54/39/47/+2/0.00/545/89          31 NW  AERO 31 NW  RMY N/A
11/05 61/46/54/+9/0.01/006/01          26 S   AERO 24 S   RMY N/A
11/06 64/47/56/+11/0.05/000/00         32 S   AERO 28 SSW RMY 35
11/07 46/35/41/-4/0.11/145/24          26 NNW AERO 23 N   RMY 26
11/08 3/34/39/-5/0.08/295/49           26 N   AERO 23 N   RMY 27
11/09 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/-5/0.26/000/00          20 NNW AERO 17 NNW RMY 20
11/14 40/33/37/-5/T/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/+2/0.21/012/02          32 SE  AERO 32 SE  RMY N/A TSTM
11/17 42/30/36/-5/0.00/565/97          41 WNW AERO 43 WNW RMY 47
11/18 49/26/38/-3/0.08/168/29          35 SSW AERO 35 SSW RMY 39
11/19 58/34/46/+5/0.36/231/40          50 W   AERO 50 W   RMY 54
11/20 39/31/35/-5/0.00/462/80          48 WNW AERO 50 WNW RMY 44
11/21 57/35/46/+6/0.00/506/88          46 SSW AERO 46 SSW RMY 48
11/22 53/35/44/+4/0.87/000/00          37 NW  AERO 38 NW  RMY 41
11/23 40/26/33/-6/0.00/571/100         26 NW  AERO 25 NW  RMY N/A
11/24 49/29/39/0/0.00/…/..           28 SSW AERO 26 SSW RMY 29
11/25 57/38/48/+9/0.00/…/..          29 SSW AERO 28 SSW RMY 31
11/26 46/33/40/+2/0.00/…/..          39 WNW AERO 41 WNW RMY 41
11/27 44/24/34/-4/0.00/…/..          37 W   AERO 39 W   RMY 36
11/28 45/19/32/-6/0.00/…/..          35 S   AERO 37 S   RMY N/A
11/29 58/34/46/+9/0.00/…/..          46 W   AERO 47 W   RMY 46
11/30 43/26/35/-2/0.00/…/..          25 SSE AERO 25 NNW RMY 25

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

12/01 Low temp since midnight is 43F; normal low is now 29F

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

RECORDS FOR DECEMBER 1
HIGH 70 IN 2001
LOW 3 IN 1887
PRECIP 1.46 INS. IN 1917
SNOW 2.0 INS. IN 1902
PEAK GUST 72 MPH NW IN 1964

RECORDS FOR DECEMBER 2
HIGH 61 IN 1998
LOW 3 IN 1890
PRECIP 2.09 INS. IN 1974
SNOWFALL 5.0 INS. IN 1894, 1929
PEAK GUST 89e MPH SSE IN 1942

TODAY’S REPORT PREPARED BY: Kaitlin Geagan