Tuesday, December 5, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 5, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WIND PICKS UP, PRESSURE DROPS AND LIGHT
RAIN MOVES IN…

Maximum temperatures continue to be around
the daily normals. Yesterday we had a high
of 43F. Which is also the daily normal. So
far today we have had a high of 43F. This is
also the daily normal for today.
Pressure began to fall overnight and winds
from the SE picked up throughout the day
with a peak gust of 26 kts (30 MPH) the
by 1:00 PM observation.Light rain began
before noon and continued but only a trace
was measured by 1:00 PM.

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: 9,108 minutes of possible 17,010 or 54%
Astronomical total minutes: 9,431 minutes of possible 17,610 or 54%

BHO Warmest Fall (Sep-Nov) 24-hour Corrected Mean Temperature, deg F (1885-2017):

1) 55.3 in 2017
2) 55.1 in 2011
3) 54.8 in 1931
54.8 in 2015
5) 54.3 in 1946
54.3 in 2001

Today’s Observations:

7 A.M.
Weather: Scattered altostratus, broken cirrostratus, few
stratocumulus castellanus NNE-ESE, few altocumulus ENE-ESE
Temperature: 35F; Dew Point: 32F; Wind: SE at 12 kts
Sea-level pressure: 30.39 ins. Hg, falling, then more quickly
Visibility: 35 miles except NNE-ESE 50 miles, distant fog
6-hr Max temp: 35F
6-hr Min temp: 34F
24-hr precip: 0.00 ins.
BHO SA 1155 160 SCT 300 BKN 35 290/35/32/1412/039/ FEW SCCAS
NNE-ESE FEW AC ENE-ESE VSBY 50 NNE-ESE DSNT FG ESE-NNE/ 8/516
58015 10035 20034

10 A.M.
Weather: Scattered stratus fractus, broken stratocumulus,
overcast altostratus
Temperature: 40F; Dew Point: 35F; Wind: SE at 15G24 kts
Sea-level pressure: 30.33 ins. Hg, rising, then more quickly
Visibility: 35 miles, distant fog in all directions
3-hr precip: 0.00 ins.
BHO SA 1455 22 SCT E40 BKN 180 OVC 35 272/40/35/1415G24/033/
DSNT FG ALQDS/ 8/51/ 58018

1 P.M.
Weather: Overcast nimbostratus with very light precipitation
Temperature: 43F; Dew Point: 40F; Wind: SSE at 14G22 kts
Sea-level pressure: 30.22 ins. Hg, falling, then more quickly
Visibility: 25 miles, distant fog in all directions
6-hr Max temp: 43F
6-hr Min temp: 35F
6-hr precip: Trace
BHO SA 1755 E17 OVC 25L- 235/43/40/1514G22/022/ PCPN VRY LGT
DSNT FG ALQDS/ 8/6// 56037 MANUAL 600// 10043 20035

SUMMARY FOR MONDAY, DECEMBER 4, 2017

TEMPERATURE (DEGREES F)
MAX…..43   NORMAL…..43
MIN…..32   NORMAL…..28
MEAN….38   NORMAL…..35

DEPARTURE FROM 30-YEAR NORMAL………………………+3
TOTAL DEPARTURE FOR THE MONTH……………………..+10 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….27  DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH…………106  DEPARTURE………-10
TOTAL HEATING UNITS FOR THE SEASON……….1075  DEPARTURE……..-303
TOTAL HEATING UNITS LAST SEASON TO DATE…..1131  DIFFERENCE……..-56

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….16 E    AT 7:09 P.M.
AERO……………………14 E    AT 7:10 P.M.
ASOS……………………16 ESE AT 10:17 P.M.
DAVIS…………………..14 E    AT 4:47 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………11 E    AT 7:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………13 ESE AT 10:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12 E    AT 7:10 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.5 N
ASOS…………………..7.8
DAVIS………………….7.3 ENE [064 DEG.]

*** LAST OF MULTIPLE PEAK GUST

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……….0.04  DEPARTURE……-0.61
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE YEAR……….49.88  DEPARTURE……+0.70
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…….-0.3
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-1.1
TOTAL SNOWFALL FOR THE SEASON……………0.0  DEPARTURE…….-3.7

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 49/29/39/0/0.00/558/98           28 SSW AERO 26 SSW RMY 29
11/25 57/38/48/+9/0.00/523/92          29 SSW AERO 28 SSW RMY 31
11/26 46/33/40/+2/0.00/509/90          39 WNW AERO 41 WNW RMY 41
11/27 44/24/34/-4/0.00/254/45          37 W   AERO 39 W   RMY 36
11/28 45/19/32/-6/0.00/557/99          35 S   AERO 37 S   RMY N/A
11/29 58/34/46/+9/0.00/370/66          46 W   AERO 47 W   RMY 46
11/30 43/26/35/-2/0.00/263/47          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 50/35/43/+6/0.04/…/..          28 NW  AERO 29 NW  RMY 30
12/02 42/29/36/0/0.00/…/..           20 NNW AERO 18 NNW RMY N/A
12/03 42/32/37/+1/0.00/…/..          14 N   AERO 10 N   RMY N/A
12/04 43/32/38/+3/0.00/…/..          16 E   AERO 14 E   RMY N/A

12/05 Low temp since midnight is 33F; normal low is now 27F

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

RECORDS FOR DECEMBER 5
HIGH 65 IN 2001
LOW -1 IN 1926
PRECIP 2.86 INS. IN 1993
SNOWFALL 7.0 INS. IN 1926, 1981
PEAK GUST 67 MPH WNW IN 1961, S IN 1973

RECORDS FOR DECEMBER 6
HIGH 70 IN 2001
LOW 5 IN 1901,1935
PRECIP 2.78 INS. IN 2003
SNOWFALL 17.0 INS. IN 2003
PEAK GUST 74 MPH NW IN 1981

TODAY’S REPORT PREPARED BY: Kaitlin Geagan