Sunday, December 13, 2015

| December 13, 2015 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 13, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

EXTREMELY UNUSUAL WARM DECEMBER TEMPERATURES CONTINUE
LOW TEMPERATURE 23 DEG. ABOVE NORMAL AT 48F THIS MORNING
THREE DAYS 10-12 DECEMBER AVERAGE 16-20 DEG. ABOVE NORMAL
MONTHLY AVERAGE NOW OVER 9 DEGREES ON WARM SIDE

This morning’s low of 48 degrees was 23 degrees above the
normal for this date!  A cooler northeast wind (very light)
and overcast sky held the high temperature since sunrise
to 51 degrees today while the high since midnight is 54F.
The monthly temperatures continues to soar far above the
the normal for December now running 9 degrees above normal.

Today’s Observations:

7 A.M.
Weather: Overcast altocumulus, stratocumulus layer extending
SSW-NW, small breaks in overcast
Temperature: 48F; Dew Point: 37F; Wind: NNE at 8 kts
Sea-level pressure: 30.09 ins. Hg, rising slightly
Visibility: 25 miles, except NE 35 miles, hazy
6-hr Max temp: 53F
6-hr Min temp: 48F
24-hr precip: 0.00
BHO SA 1155 E80 OVC 25 217/48/37/0308/017/ SC LYR SSW-NW SML
BINOVC ALQDS VSBY NE 35 HAZY/ 8/63/ 53013 10053 20048

10 A.M.
Weather: Overcast stratocumulus, bright spots in overcast
Temperature: 50F; Dew Point: 38F; Wind: NE at 4 kts,
Sea-level pressure: 30.22 ins. Hg, rising then more rapidly
Visibility: 60 miles, except 70 miles NW, light distant haze
BHO SA 1455 E28 OVC 60 234/50/38/0504/022/ BRGHT SPTS IOVC
VSBY NW 70 LGT DSNT HZ WND LGT/ 8/5// 53017

1 P.M.
Weather: Overcast stratocumulus, few cumulus fractus, cumulus
distant E, bright sky along horizon distant SSW and bright spots
in the overcast distant S-SW
Temperature: 48F; Dew Point: 40F; Wind: NE at 4 kts, wind light
Sea-level pressure: 30.20 ins. Hg, falling then more slowly
Visibility: 65 miles, 75 miles NW
6-hr max. temp: 51F
6-hr min. temp: 48F
BHO SA 1755 E25 OVC 65 226/48/40/0504/020/ FEW CUFRA/CU DSNT E
BRGHT SKY ALG HRZN DSNT SSW AND BRGHT SPTS INOVC DSNT S-SW WND LGT/
8/8// 56008 10051 20048

SUMMARY FOR SATURDAY, DECEMBER 12, 2015

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..40
MIN…..46   NORMAL…..25
MEAN….53   NORMAL…..33

DEPARTURE FROM 30-YEAR NORMAL…………………+20
TOTAL DEPARTURE FOR THE MONTH………………..+115  [+9.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12   DEPARTURE………-21
TOTAL HEATING UNITS FOR THE MONTH………….250   DEPARTURE……..-116
TOTAL HEATING UNITS FOR THE SEASON………..1252   DEPARTURE……..-375
TOTAL HEATING UNITS LAST SEASON TO DATE……1517   DIFFERENCE…….-265

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23  W    AT 2:20 A.M.
ASOS……………………23  W    AT 2:20 A.M.
DAVIS…………………..23  W    AT 2:14 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………18  W    AT 2:19 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  W    AT 2:21 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16  W    AT 2:15 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.5 W
ASOS…………………..10.5
DAVIS…………………..9.4 W [270 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………..0.38  DEPARTURE……-1.60
ASOS……………0.37
TOTAL PRECIPITATION FOR THE YEAR………..39.79  DEPARTURE…..-10.72
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……-4.0
TOTAL SNOWFALL FOR THE SEASON………….TRACE  DEPARTURE……-6.6

PRELIMINARY CLIMATE SUMMARY FOR 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

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/…./0.0/162/29           43 WNW RMY 42
12/4  47/32/40/+5/0.00/0.0/444/80           32 NW  RMY 32
12/5  50/33/42/+7/0.00/0.0/548/99           21 W   RMY N/A
12/6  57/35/46/+11/0.00/0.0/531/96          22 SW  RMY N/A
12/7  54/37/46/+12/0.00/0.0/353/64          31 NE  RMY N/A
12/8  42/35/39/+5/0.01/0.0/000/00           32 NE  RMY 31
12/9  44/34/39/+5/…./0.0/044/08           28 SSE RMY N/A
12/10 57/41/49/+16/T/0.0/…/..             29 SE  RMY N/A
12/11 56/44/50/+17/0.00/…/…/..          28 SSW RMY 28
12/12 59/46/53/+20/0.00/…/…/..          23 W   RMY N/A

12/13 low since midnight is 48F; normal low is now 25F

DAILY RECORDS FOR DECEMBER 2015

-NONE SO FAR.

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

RECORDS FOR DECEMBER 13
HIGH 60 IN 1984
LOW 0 IN 1893
PRECIP 1.45 INS. IN 1983
SNOWFALL 9.2 INS. IN 2007
PEAK GUST 81e WNW IN 1976

RECORDS FOR DECEMBER 14
HIGH 62 IN 1901
LOW -6 IN 1893
PRECIP 1.94 INS. IN 2002
SNOWFALL 8.0 INS. IN 1907
PEAK GUST 78e ENE IN 1941

TODAY’S REPORT PREPARED BY: Robert Skilling

Category: Daily Discussions

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