Friday, December 4, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 4, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY COOL AIR WORKS INTO THE REGION, BRILLIANT
BLUE SKIES THIS MORNING

Yesterday’s maximum temperature of 53F was reached
by midnight yesterday morning, with back to back days
featuring a maximum reading of 53F and minimum of 37F.
Both days were 9 degrees above the daily normal temperature.

Although December has begun with rain spanning three
days, precipitation for the month is still 0.12 inches
below normal. Annual precipitation is 9.24 inches
below normal with a strong likelihood that this deficit
will not be erased by the end of the year.
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
PRELIMINARY STATS FOR OCTOBER 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 [-2.18] 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: Clear, few stratocumulus distant offshore NE-S,
few cumulus distant WNW
Temperature: 32F; Dew Point: 29F; Wind: W at 9 kts
Sea-level pressure: 29.29 ins. Hg, rising, then more quickly
Visibility: 75 miles
6-hr Max temp: 37F
6-hr Min temp: 32F
24-hr precip: Trace
BHO SA 1155 CLR 75 259/32/29/2809/029/ FEW SC DSNT OFFSHR NE-S
FEW CU DSNT WNW/ 8/500 53031 10037 20032

10 A.M.
Weather: Clear, few stratocumulus distant offshore ENE-ESE,
few cumulus distant SW-NNE
Temperature: 41F; Dew Point 31F; Wind: estimated WNW at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.37 ins. Hg, rising, then more quickly
Visibility: 70 miles
BHO SA 1455 CLR 70 285/41/31/E2905/037/ FEW SC DSNT OFFSHR ENE-ESE
FEW CU DSNT SW-NNE WND LGT/ 8/800 53026

1 P.M.
Weather: Clear, few stratocumulus/cumulus in all directions
Temperature: 46F; Dew Point 31F; Wind: W at 13G23 kts,
Sea-level pressure: 30.36 ins. Hg, falling, then more slowly
Visibility: 80 miles, except 50 miles W-NW
6-hr max. temp: 46F
6-hr min. temp: 32F
BHO SA 1755 CLR 80 282/46/31/2813G23/036/ VSBY W-NW 50 MI
FEW CU/SC ALQDS/ 8/500 56003 10046 20032
SUMMARY FOR THURSDAY, DECEMBER 3, 2015

TEMPERATURE (DEGREES F)
MAX…..53   NORMAL…..44
MIN…..37   NORMAL…..28
MEAN….45   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL………………….+9
TOTAL DEPARTURE FOR THE MONTH…………………+17  [+5.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..20   DEPARTURE……….-9
TOTAL HEATING UNITS FOR THE MONTH…………..69   DEPARTURE………-18
TOTAL HEATING UNITS FOR THE SEASON………..1071   DEPARTURE……..-277
TOTAL HEATING UNITS LAST SEASON TO DATE……1228   DIFFERENCE…….-157

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….43 WNW  AT   4:07 P.M.
ASOS……………………42 WNW  AT   4:25 P.M.
DAVIS…………………..40 NW   AT   1:14 P.M. RMY 42
FASTEST MILE FOR YESTERDAY…………………31 WNW  AT   4:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………30 W    AT   4:08 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..27 NW   AT   1:15 P.M.
AVERAGE WIND SPEED AND DIRECTION………….16.3 WNW
ASOS………………….15.7
DAVIS…………………13.8 WNW [292 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE  DEPARTURE……-0.17
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..0.37  DEPARTURE……-0.12
ASOS……………0.36
TOTAL PRECIPITATION FOR THE YEAR………..39.79  DEPARTURE……-9.24
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……-0.8
TOTAL SNOWFALL FOR THE SEASON………….TRACE  DEPARTURE……-3.4
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/…./000/00               19 NNE RMY 19
12/2  53/37/45/+9/…./000/00               25 SSE RMY 25
12/3  53/37/45/+9/…./…/..               43 WNW RMY 42

12/4 low since midnight is 32F; normal low is now 28F

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 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

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

TODAY’S REPORT PREPARED BY: Brian Fitzgerald