Friday, December 19, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 19, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
STILL ANOTHER DAY WITH CLOUDS PREVAILING
SUNSHINE FOR THE MONTH DOWN NEAR 30% OF POSSIBLE
During a month of December which may rank among the
cloudiest on record, the sun is again hidden behind
a dense deck of stratocumulus clouds today. Yesterday
we managed to get some sunshine after the 8th day with
no sunshine on December 17th. The monthly percentage
is around 30%. Normal is in the 45% range.
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, higher overcast stratocumulus,
break in overcast distant NNE-NE and SE-SSW
Temperature: 31F; Dew Point: 25F; Wind: NW at 10 kts
Sea-level pressure: 29.91 ins. Hg, rising then more rapidly
Visibility: 55 miles, light distant haze
6-hr max temp: 34F
6-hr min temp: 30F
24-hr precip: 0.01 in.
24-hr snowfall: trace
BHO SA 1155 26 SCT E45 OVC 55 128/31/25/3010/991/
BINOVC NNE-NE AND SE-SSW LGT DSNT HZ TRACE SNW PST 24 HRS/
8/5// 53011 MANUAL 70001 ASOS 70001 10034 20030
10 A.M.
Weather: Overcast stratocumulus, bright sky and cumulus visible
SE-SSW and bright sky/cumulus visible distant N-NE, mountain
in cloud 70 NW
Temperature: 32F; Dew Point: 23F; Wind: NW at 11G19 kts,
Wind: Gust to 23 kts past hour
Wind: Direction variability WNW-N
Sea-level pressure: 29.96 ins. Hg, rising then more slowly e
Visibility: 75 miles, mountain in cloud 70 NW
BHO SA 1455 E24 OVC 75 144/32/23/3211G19/996/ BRGHT SKY/CU VSB
ALG HRZN DSNT SE-SSW AND SML BINOVC/CU VSB ALG HRZN DSNT N-NE
MTN INCLD 70 NW WND GST 23 KTS PST HR WND 29V35/ 8/8// 51016
1 P.M.
Weather: Overcast stratocumulus, bright spots in overcast
along horizon distant SSE-SW, break in overcast distant
N-NNE, mountain in cloud 70 NW
Temperature: 32F; Dew Point: 22F; Wind: NW at 10 kts
Sea-level pressure: 29.94 ins. Hg, falling, then steady
Visibility: 75 miles, mountain in cloud 70 NW
6-hr max temp: 32F
6-hr min temp: 31F
6-hr precip: none
BHO SA 1755 // OVC 75 137/32/22/3110/994/ BRT SPTS IOVC ALG
HRZN DSNT SSE-SW BINOVC DSNT N-NNE MTN IN CLD 70 NW/ 8/5//
56007 10032 20031
SUMMARY FOR THURSDAY, DECEMBER 18, 2014
TEMPERATURE (DEGREES F)
MAX…..41 NORMAL…..38
MIN…..32 NORMAL…..23
MEAN….37 NORMAL…..31
DEPARTURE FROM 30-YEAR NORMAL…………………….+6
TOTAL DEPARTURE FOR THE MONTH……………………+39 [+2.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28 DEPARTURE………..-7
TOTAL HEATING UNITS FOR THE MONTH………….527 DEPARTURE……….-41
TOTAL HEATING UNITS FOR THE SEASON………..1686 DEPARTURE………-144
TOTAL HEATING UNITS LAST SEASON TO DATE……1864 DIFFERENCE……..-178
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………35 WNW AT 12:08 P.M.
ASOS…………………..38 WNW AT 12:08 P.M.
DAVIS………………….37 W AT 11:11 A.M. RMY 38
FASTEST MILE FOR YESTERDAY………………..27 WNW AT 11:11 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..28 WNW AT 11:11 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….25 WNW AT 11:11 A.M.
AVERAGE WIND SPEED AND DIRECTION………..15.0 W
ASOS………………..14.7
DAVIS……………….12.6 W (280 degrees)
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M… 0.01 DEPARTURE…..-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….5.85 DEPARTURE…..+2.92 (corr.)
ASOS…………..6.01
TOTAL PRECIPITATION FOR THE YEAR……….53.61 DEPARTURE…..+2.15
ASOS………….54.20
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………trace DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.6 DEPARTURE……-6.1
TOTAL SNOWFALL FOR THE SEASON……………9.3 DEPARTURE……+0.0
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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 63/37/50/+13/0.01/0.0/391/70 28 WNW RMY 31
12/2 37/30/34/-2/0.10/T/000/00 26 E RMY 29
12/3 49/34/42/+6/0.31/0.0/000/00 40 W RMY 43
12/4 41/27/34/-1/0.00/0.0/505/91 29 WNW RMY N/A
12/5 42/23/33/-2/0.12/0.0/382/69 21 E RMY 22
12/6 43/36/40/+5/0.99/0.0/000/00 25 NNW RMY N/A
12/7 36/18/27/-7/0.15/0.0/193/35 31 N RMY 34
12/8 25/16/21/-13/0.01/0.1/000/00 24 N RMY N/A
12/9 48/25/37/+3/3.23/0.0/000/00 48 ENE RMY 52
12/10 47/35/41/+8/0.43/0.0/000/00 35 NNE RMY 37
12/11 35/29/32/-1/0.05/0.5/000/00 27 SW RMY 27
12/12 36/26/31/-2/0.00/0.0/230/42 23 WNW RMY 25
12/13 40/27/34/+2/0.00/0.0/191/35 28 NW RMY 28
12/14 43/28/36/+4/0.00/0.0/377/69 20 NW RMY 20
12/15 41/28/35/+3/0.00/0.0/536/98 17 NW RMY 17
12/16 42/33/38/+7/T/T/011/02 17 E RMY N/A
12/17 45/37/41/+10/0.43/0.0/000/00 27 W RMY N/A
12/18 41/32/37/+6/0.02/T/…/39 35 WNW RMY 38
12/19 morning low temp: 30F since midnight; normal low is now 23F
DAILY RECORDS FOR DECEMBER 2014:
-DAILY PRECIPITATION RECORD FOR DECEMBER 9 2014
Old record of 1.51 inches set in 1952,
replaced with new record of 3.23 inches.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 19
HIGH 59 IN 1899
LOW -1 IN 1919
PRECIP 2.06 INS. IN 1986
SNOWFALL 14.1 INS. IN 1945
PEAK GUST 68 NE IN 1986
RECORDS FOR DECEMBER 20
HIGH 61 IN 1957
LOW -16 IN 1942
PRECIP 1.69 INS. IN 1936
SNOWFALL 13.7 INS. IN 2009
PEAK GUST 75 MPH S IN 2002
TODAY’S REPORT PREPARED BY: Robert Skilling
