Sunday, December 6, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 6, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
DECEMBER TEMPERATURES CONTINUE TO WARM FAR ABOVE NORMAL
LOW OF 35F THIS MORNING WAS +8 ABOVE NORMAL
EARLY AFTERNOON TEMPS. WERE IN THE MID 50’S
The first 5 days of December averaged 5 degrees above the normal with
only December 1 coming in slightly below normal. Increasing warmth
continues today with light to gentle to moderate southwest winds.
Radiation fog, mostly thin filled the lowest layer of the atmosphere
This morning. As warmer air prevailed aloft the top of the inversion could
be seen starting at around 5 hundred feet rising to one thousand
feet by 10 A.M. before dissipating. The effects of warm air above
the cold layer caused “looming” of 2000 foot Mt. Wachusett which
appeared quite flattened 45 miles to our west-northwest and with
only the very top of the summit visible above the inversion.
The sky has been completely free of clouds again today until high
cirrus clouds began to appear to the west early this afternoon.
The maximum sea-level pressure for November of 30.88
inches, which occurred late on the 25th, ties the
highest pressure ever measured in the month that was
previously set on November 28, 1932.
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 [-2.18]
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, SKC, no clouds, thin fog below inversion,
estimated top 5 hundred over city north
Temperature: 35F; Dew Point: 33F; Wind: SW at 12 kts
Sea-level pressure: 30.49 ins. Hg, falling then more slowly
Visibility: 8 miles, SW 12 miles, N 15 miles, thin fog
6-hr Max temp: 39F
6-hr Min temp: 35F
24-hr precip: 0.00
BHO SA 1155 CLR 8 324/35/33/2312/049/ SKC THN FG ALQDS BLO INVSN
ESTMTD TOP 5 HND OVR CTY N VSBY ESTMTD ABV INVSN SW 12 N 15 NE-S 6
THN FG/ 56011 10039 20035
10 A.M.
Weather: Clear, SKC not a cloud anywhere
Temperature: 43F; Dew Point: 33F; Wind: SW at 9 kts,
Sea-level pressure: 30.45 ins. Hg, falling
Visibility: 12 miles hazy to WNW summit of mountain 45 miles
away is clearly visible above the inversion
BHO SA 1455 CLR 12 312/43/33/2209/045/ SKC HZ BLO INVSN ESTMTD
TOP ONE THSND ALQDS SUMMIT MTN 45 WNW CLRLY VSBL
VSBY ESTMTD 60 WNW ABV INVSN/ 57012
1 P.M.
Weather: Clear, cirrus distant SW-NW
Temperature: 55F; Dew Point: 32F; Wind: SSW at 9 kts,
Sea-level pressure: 30.37 ins. Hg, falling, then more rapidly
Visibility: 40 miles, except WNW 55 miles, distant haze
6-hr max. temp: 56F
6-hr min. temp: 35F
BHO SA 1755 CLR 40 285/55/32/2009/037/ CI DSNT SW-NW VSBY WNW 55
DSNT HZ/ 8/001 58027 10056 20035
SUMMARY FOR SATURDAY, DECEMBER 5, 2015
TEMPERATURE (DEGREES F)
MAX…..50 NORMAL…..43
MIN…..33 NORMAL…..27
MEAN….42 NORMAL…..35
DEPARTURE FROM 30-YEAR NORMAL………………….+7
TOTAL DEPARTURE FOR THE MONTH…………………+29 [+5.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23 DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH………….117 DEPARTURE………-29
TOTAL HEATING UNITS FOR THE SEASON………..1119 DEPARTURE……..-289
TOTAL HEATING UNITS LAST SEASON TO DATE……1291 DIFFERENCE…….-172
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 W AT 12:04 A.M.
ASOS……………………20 W AT 12:04 A.M.
DAVIS…………………..18 WNW AT 12:18 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………14 W AT 7:45 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 W AT 7:46 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 WNW AT 1:24 A.M. .
AVERAGE WIND SPEED AND DIRECTION…………..8.9 WNW
ASOS…………………..9.0
DAVIS………………….7.8 W [280 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……-0.45
ASOS……………0.36
TOTAL PRECIPITATION FOR THE YEAR………..39.79 DEPARTURE……-9.57
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……-1.4
TOTAL SNOWFALL FOR THE SEASON………….TRACE DEPARTURE……-4.0
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 low since midnight is 35F; normal low is now 27F
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 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
RECORDS FOR DECEMBER 7
HIGH 74 IN 1998
LOW 6 IN 1906
PRECIP 1.67 INS. IN 1953
SNOWFALL 6.3 INS. IN 2003
PEAK GUST 76e SE IN 1976
TODAY’S REPORT PREPARED BY: Robert Skilling
