Tuesday, December 8, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 8, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST CONDITIONS TUESDAY, AS SHOWERS
TRY TO MOVE UP FROM THE SOUTH

Overcast stratus and stratocumulus have dominated
the skies this morning with showers that have slowly
made their way onshore this morning from the south.

Thin fog and plentiful moisture have reduced visibility
today throughout the day, with little fluctuation in the
daytime temperature. Over a six hour span, temperatures
have warmed from 37F to a maximum of 39F by the 1:00 PM
EST observation. Showers have remained South and the
observatory- no precipitation has been recorded so far today.

BHO Warmest Novembers, deg F (1885-2015):

1) 47.9 in 2011
2) 47.4 in 1975
3) 47.1 in 2006
4) 46.4 in 1948
46.4 in 1979
46.4 in 2009
7) 46.1 in 2015
8) 46.0 in 2001
9) 45.7 in 1953
45.7 in 1999

BHO Highest November Sea-Level Pressure, inches (1885-2015):

1) 30.88 in 1932
30.88 in 2015
3) 30.86 in 1887
4) 30.83 in 1896
5) 30.82 in 1891
6) 30.80 in 1996
7) 30.79 in 2013
8) 30.77 in 1914

PRELIMINARY STATS FOR NOVEMBER 2015

TEMPERATURE, Deg. F
Avg. Max. 54.3 [+4.3] Avg. Min. 38.6 [+5.1] Mean      46.5 [+4.8] Corrected mean: 46.1
Max. for month: 72 on 5th
Min. for month: 23 on 24th

COOLING DEGREE DAYS
Total cooling units: 1 [+1] Total for the season: 811 [+209] Total for last season: 595

HEATING DEGREE DAYS
Total heating units: 548 [-150] Total for the season: 1002 [-259] Total for last season: 1159

PRECIPITATION, Inches
Total: 2.59 [-2.17] Greatest in 24 hrs: 1.18 from 20th
Snowfall: Trace [-2.3] Seasonal: Trace [-2.6]

WIND, mph
Avg. uncorrected wind speed: 12.4
Avg. corrected wind speed: 12.7
Prevailing wind direction: W @ 13%
Peak gust and direction: 43 SSE on the 20th

SUNSHINE:
Campbell-Stokes card minutes: 9222/17010 or 54%
Astronomical total minutes:   9562/17644 or 54%

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 37F; Dew Point: 32F; Wind: N at 98 kts
Sea-level pressure: 30.11 ins. Hg, rising, then more quickly
Visibility: 20 miles, thin fog
6-hr Max temp: 41F
6-hr Min temp: 37F
24-hr precip: 0.00
BHO SA 1155 E20 BKN 20 197/37/32/3608/011/ THN FG ALQDS/
8/6// 52005 10041 20037

10 A.M.
Weather: Showers distant ESE-SSE, few stratus fractus
in all directions, broken stratocumulus, overcast stratus
Temperature: 39F; Dew Point: 35F; Wind: NNW at 9 kts,
Sea-level pressure: 30.14 ins. Hg, rising, then falling but higher still
Visibility: 20 miles, except 15 miles ESE-SSE, distant showers ESE-SSE
and thin fog in all directions
BHO SA 1455 E27 BKN 44 OVC 20 205/39/35/3409/014/ VSBY ESE-SSE
15 MI SHWRS DSNT ESE-SSE FEW STFRA ALQDS THN FG ALQDS/ 8/6//
50008

1 P.M.
Weather: Overcast stratus
Temperature: 39F; Dew Point: 37F; Wind: N at 8 kts,
Sea-level pressure: 30.07 ins. Hg, falling, then more quickly
Visibility: 20 miles, except 15 miles W, 30 miles SW, thin fog
6-hr max. temp: 39F
6-hr min. temp: 37F
BHO SA 1755 E17 OVC 20 184/39/37/3508/007/ VSBY W 15 MI SW 30 MI
THN FG ALQDS/ 8/6// 58021 10039 20037

SUMMARY FOR MONDAY, DECEMBER 7, 2015

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..42
MIN…..37   NORMAL…..27
MEAN….46   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL…………………+12
TOTAL DEPARTURE FOR THE MONTH…………………+52  [+7.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..19   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE MONTH………….155   DEPARTURE………-52
TOTAL HEATING UNITS FOR THE SEASON………..1157   DEPARTURE……..-312
TOTAL HEATING UNITS LAST SEASON TO DATE……1354   DIFFERENCE…….-197

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….31  NE  AT 11:49 P.M.*
ASOS……………………30  NNE AT 11:33 P.M.
DAVIS…………………..28  NE  AT 11:45 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………21  NE  AT 11:45 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21  NE  AT 11:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21  NE  AT 11:46 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.5 WSW
ASOS…………………..10.2
DAVIS…………………..8.6 W [276 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE……-0.17
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..0.37  DEPARTURE……-0.78
ASOS……………0.36
TOTAL PRECIPITATION FOR THE YEAR………..39.79  DEPARTURE……-9.90
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……-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……-2.1
TOTAL SNOWFALL FOR THE SEASON………….TRACE  DEPARTURE……-4.7

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER & DECEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

11/1  59/45/52/+6/T/006/01                  30 SSW RMY 31
11/2  62/47/55/+9/0.00/476/77               24 W   RMY N/A
11/3  71/44/58/+12/0.00/616/100             25 W   RMY 25
11/4  66/49/58/+13/0.00/601/98              22 SSW RMY N/A
11/5  72/51/62/+17/0.00/281/46              31 SW  RMY 36
11/6  71/60/66/+21/0.00/109/18              35 SSW RMY 38
11/7  64/46/55/+10/0.00/029/04              33 WNW RMY 35
11/8  54/39/47/+3/0.00/591/98               26 NW  RMY 30
11/9  59/38/49/+5/0.00/577/96               20 W   RMY 21
11/10 53/45/49/+5/0.11/000/00               28 NE  RMY N/A
11/11 48/43/46/+3/0.60/000/00               41 NE  RMY N/A
11/12 55/42/49/+6/0.07/000/00               28 S   RMY 30
11/13 57/41/49/+6/0.02/385/65               40 WSW RMY 47
11/14 45/31/38/-4/0.00/425/72               40 NW  RMY 47
11/15 51/31/41/-1/0.00/241/41               25 W   RMY 27
11/16 59/36/48/+6/0.00/416/71               25 NNW RMY 29
11/17 45/28/37/-4/0.00/572/98               18 NNE RMY N/A
11/18 50/35/43/+2/0.00/575/99               17 SSE RMY N/A
11/19 55/38/47/+6/T/000/00                  29 SSE RMY N/A
11/20 58/41/50/+10/1.18/416/72              43 SSE RMY N/A
11/21 46/35/41/+1/0.00/380/66               20 ENE RMY 21
11/22 45/35/40/+0/0.40/000/00               26 NW  RMY 28
11/23 40/25/33/-6/0.02/543/95               24 NW  RMY 29
11/24 42/23/33/-6/0.00/564/99               20 WSW RMY 19
11/25 46/31/39/+0/0.00/568/100              18 SSE RMY N/A
11/26 58/37/48/+10/0.00/386/68              33 S   RMY 35
11/27 63/48/54/+18/0.00/249/44              35 SW  RMY 38
11/28 55/38/47/+9/0.19/000/00               23 SW  RMY N/A
11/29 42/28/35/-2/0.00/410/73               17 NNW RMY 21
11/30 37/27/32/-5/T/T/151/27                17 S   RMY 18

12/1  42/30/36/-1/…./0.0/000/00           19 NNE RMY 19
12/2  53/37/45/+9/…./0.0/000/00           25 SSE RMY 25
12/3  53/37/45/+9/…./0.0/…/..           43 WNW RMY 42
12/4  47/32/40/+5/0.00/0.0/…/..           32 NW  RMY 32
12/5  50/33/42/+7/0.00/0.0/…/..           21 W   RMY N/A
12/6  57/35/46/+11/0.00/0.0/…/..          22 SW  RMY N/A
12/7  54/37/46/+12/0.00/0.0/…/..          31 NE  RMY N/A

12/8  low since midnight is 37F; normal low is now 26F

DAILY RECORDS FOR NOVEMBER AND DECEMBER 2015

**11/6 DAILY RECORD MAXIMUM TEMPERATURE OF 71F
TIES PREVIOUS RECORD OF 71F SET IN 1959

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
BREAKS PREVIOUS RECORD OF 58F SET IN 1938

**11/6 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F
TIES PREVIOUS MONTHLY RECORD OF 60F SET ON
11/8/1996

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

RECORDS FOR DECEMBER 8
HIGH 62 IN 1966
LOW -4 IN 1906
PRECIP 1.54 INS. IN 1969
SNOWFALL 2.5 INS. IN 2001
PEAK GUST 78e W IN 1979

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

TODAY’S REPORT PREPARED BY: Brian Fitzgerald