Wednesday, December 17, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 17, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
RAIN, FALLING MODERATELY FOR A TIME, CLEARS
BY MID MORNING, THICK FOG LEFT IN PLACE
Rain fell moderately at times between 3:00 and
7:00 AM EST this morning, dropping 0.42 inches
by the 7:00 AM EST observation, and adding to
an already wetter-than-average December.
Visibility this morning was extremely poor at
just 1/16 of a mile with barely 100 feet of
vertical visibility. Today’s maximum temperature
may have already been recorded prior to 5:00 AM
EST at 45F.
By the 1:00 PM EST observation fog was thinning
and attempting to lift. Visibility was improving
to 3/4 of a mile, except lower N-E at 1/4 of a mile.
Today’s Observations:
7 A.M.
Weather: Light rain, thick fog
Temperature: 41F; Dew Point: 41F; Wind: NNW at 9 kts
Sea-level pressure: 29.74 ins. Hg, falling, then more slowly
Visibility: 1/16 of a mile, obscured by thick fog
6-hr max temp: 44F
6-hr min temp: 41F
24-hr precip: 0.42
24-hr snowfall: none
BHO SA 1155 W1 X 1/16R-F 072/41/41/3309/974/
8//// 56021 ASOS 60043 70043 MANUAL 70042 10044 20041
10 A.M.
Weather: Thick fog
Temperature: 39F; Dew Point: 39F; Wind: NW at 11 kts
Sea-level pressure: 29.74 ins. Hg, about the same
Visibility: 1/16 of a mile, obscured by thick fog
3-hr precip: 0.01
BHO SA 1455 W1 X 1/16F 072/39/39/3211/974/ R-E29
8//// 55000 ASOS 60002 MANUAL 60001
1 P.M.
Weather: Fog
Temperature: 42F; Dew Point: 42F; Wind: WNW at 11 kts
Sea-level pressure: 29.70 ins. Hg, falling, then more slowly
Visibility: 3/4 of a mile, except 1/4 of a mile N-E,
obscured by fog
6-hr max temp: 43F
6-hr min temp: 39F
6-hr precip: 0.01
BHO SA 1755 W3 X 3/4F 057/42/42/2911/970/ VSBY N-E 1/4 MI/
8//// 56015 ASOS 60002 MANUAL 60001 10043 20039
SUMMARY FOR TUESDAY, DECEMBER 16, 2014
TEMPERATURE (DEGREES F)
MAX…..42 NORMAL…..39
MIN…..33 NORMAL…..24
MEAN….38 NORMAL…..31
DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+23 [+1.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..27 DEPARTURE………..-7
TOTAL HEATING UNITS FOR THE MONTH………….475 DEPARTURE……….-24
TOTAL HEATING UNITS FOR THE SEASON………..1634 DEPARTURE………-127
TOTAL HEATING UNITS LAST SEASON TO DATE……1773 DIFFERENCE……..-139
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 E AT 10:19 P.M.
ASOS…………………..16 E AT 10:20 P.M.
DAVIS………………….15 E AT 6:33 P.M. RMY 18
FASTEST MILE FOR YESTERDAY………………..14 E AT 7:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..14 E AT 7:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….13 E AT 7:34 P.M.
AVERAGE WIND SPEED AND DIRECTION…………5.6 ESE
ASOS…………………6.2
DAVIS………………..5.2 ESE (114 degrees)
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.42 DEPARTURE…..+0.26
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE MONTH……….5.82 DEPARTURE…..+3.20
ASOS…………..5.97
TOTAL PRECIPITATION FOR THE YEAR……….53.58 DEPARTURE…..+2.43
ASOS………….54.16
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE……-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.6 DEPARTURE……-5.2
TOTAL SNOWFALL FOR THE SEASON……………9.3 DEPARTURE……+0.9
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/…./0.0/505/91 29 WNW RMY N/A
12/5 42/23/33/-2/…./0.0/382/69 21 E RMY 22
12/6 43/36/40/+5/…./0.0/000/00 25 NNW RMY N/A
12/7 36/18/27/-7/…./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/…/.. 20 NW RMY 20
12/15 41/28/35/+3/0.00/0.0/…/.. 17 NW RMY 17
12/16 42/33/38/+7/…./0.0/…/.. 17 E RMY N/A
12/17 morning low temp: 41F since midnight; the 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 17
HIGH 63 IN 2000
LOW -10 IN 1942
PRECIP 3.03 INS. IN 1888
SNOWFALL 7.5 INS. IN 1988
PEAK GUST 78 MPH SSE IN 2000
RECORDS FOR DECEMBER 18
HIGH 59 IN 1928
LOW -11 IN 1919
PRECIP 1.44 INS. IN 1915
SNOWFALL 7.0 INS. IN 1904
PEAK GUST 76e W IN 1978
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
