Saturday, December 28, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, DECEMBER 28, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
MILD, WITH FAIR WEATHER AND A COOL NORTH WESTERLY
BREEZE….
We observed our 10th consecutive day without measurable
precipitation, continuing our longest dry stretch of the
year. Skies were mostly clear from the 10 A.M. observation
onward, a difference from the cloudier skies earlier this
morning. Visibility was limited to 35 miles at 7 A.M. due to
a distant fog, but increased to an excellent 85 miles by
1 P.M. Wind has been northwesterly at an average of 10 mph,
with a peak gust so far today around 20 mph.
The high so far today is 47F, which is 11 degrees above the
daily normal maximum of 36F. The low since midnight is 35F,
which is 15 degrees above the normal minimum of 20F.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 36F; Dew Point: 32F; Wind: WNW at 10 kts
Sea-level pressure: 30.09 ins. Hg, rising steadily
Visibility: 35 miles, distant fog
6-hr Max temp: 42F
6-hr Min temp: 35F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E150 BKN 250 BKN 35 191/36/32/3010/009/ DSNT FG ALQDS/
8/085 53014 10042 20035
10 A.M.
Weather: Scattered cirrostratus, few cumulus
Temperature: 42F; Dew Point: 33F; Wind: WNW at 10 kts
Sea-level pressure: 30.15 ins. Hg, falling, then rising
Visibility: 80 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 250 SCT 80 211/42/33/3010/015/ FEW CU ALQDS/ 8/105 50020
1 P.M.
Weather: Scattered cirrostratus, few cumulus
Temperature: 45F; Dew Point: 30F; Wind: W at 10G15 kts
Sea-level pressure: 30.12 ins. Hg, falling, then falling more slowly
Visibility: 85 miles
6-hr Max temp: 47F
6-hr Min temp: 36F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 SCT 85 202/45/30/2810G15/012/ FEW CU ALQDS/ 8/108 56009
10047 20036
SUMMARY FOR FRIDAY, DECEMBER 27, 2019
TEMPERATURE (DEGREES F)
MAX…..47 NORMAL…..36
MIN…..31 NORMAL…..20
MEAN….39 NORMAL…..28
DEPARTURE FROM 30-YEAR NORMAL…………………+11
TOTAL DEPARTURE FOR THE MONTH…………………-8 [-0.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………26 DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE MONTH…………..898 DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON…………2135 DEPARTURE…….-19
TOTAL HEATING UNITS LAST SEASON TO DATE…….2182 DEPARTURE…….-47
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 SSW AT 11:11 A.M.
AERO…………………….30 SSW AT 11:01 A.M.
ASOS…………………….34 SSW AT 11:10 A.M.
DAVIS……………………36 SSW AT 11:05 A.M. RMY 34
FASTEST MILE FOR YESTERDAY………………….25 SSW AT 11:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 SSW AT 11:10 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 SSW AT 11:08 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.9 S
ASOS…………………..15.2
DAVIS………………….14.7 SSW [211 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.06 DEPARTURE……+1.73
ASOS…………..6.51
TOTAL PRECIPITATION FOR THE YEAR……….55.14 DEPARTURE……+2.27
ASOS………….55.91
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH……………19.1 DEPARTURE…….+7.9
TOTAL SNOWFALL FOR THE SEASON…………..19.2 DEPARTURE…….+5.4
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M: Missing data
12/01 32/16/24/-13/…./5.8/011/02 33 ENE AERO 32 ENE RMY N/A
12/02 37/25/31/-5/…./2.7/000/00 52 NE AERO 47 NE RMY 53
12/03 30/23/27/-9/…./4.6/000/00 32 N AERO 35 N RMY 36
12/04 34/22/28/-7/…./0.0/000/00 23 WNW AERO 23 NNW RMY N/A
12/05 41/26/34/-1/…./0.0/343/62 33 NW AERO 35 NW RMY 37
12/06 33/23/28/-7/0.02/0.1/000/00 25 NW AERO 23 NW RMY 29
12/07 31/18/25/-9/0.00/0.0/519/94 25 NW AERO 23 NW RMY N/A
12/08 36/15/26/-8/0.00/0.0/…/.. 31 SSW AERO 32 SSW RMY N/A
12/09 57/36/47/+13/…./0.0/…/.. 53 S AERO 52 S RMY 54
12/10 58/37/48/+15/…./0.0/…/.. 35 SW AERO 39 SW RMY N/A
12/11 36/23/30/-3/…./3.0/…/.. 25 NW AERO 25 NW RMY N/A
12/12 29/17/23/-10/…./1.8/…/.. 29 W AERO 30 W RMY 25
12/13 46/22/34/+2/…./0.0/…/.. 25 SSE AERO 25 SSE RMY N/A
12/14 58/46/52/+20/…./0.0/…/.. 45 S AERO 41 S RMY N/A
12/15 48/28/38/+6/0.00/0.0/…/.. 53 W AERO 53 W RMY 50
12/16 30/25/28/-3/0.00/0.0/…/.. 36 W AERO 36 W RMY N/A
12/17 35/23/29/-2/…./1.0/…/.. 22 NNW AERO 21 NE RMY 23
12/18 33/18/26/-5/…/0.0/…/.. 44 WNW AERO 45 WNW RMY N/A
12/19 20/9/15/-15/…/0.0/…/.. 51 W AERO 47 W RMY N/A
12/20 29/11/20/-10/0.00/0.0/…./.. 32 W AERO 30 W RMY 29
12/21 31/16/24/-6/0.00/0.0/…./.. 16 SSE AERO 15 SSE RMY N/A
12/22 40/26/33/+4/0.00/0.0/…./.. 23 SW AERO 21 SW RMY 23
12/23 54/33/44/+15/0.00/0.0/…./.. 30 WSW AERO 30 SW RMY 30
12/24 42/29/36/+7/0.00/0.0/…./.. 30 NW AERO 27 NW RMY 30
12/25 42/25/34/+6/0.00/0.0/…./.. 16 NNE AERO 16 N RMY N/A
12/26 39/29/34/+6/0.00/0.0/…./.. 22 ENE AERO 20 ENE RMY 22
12/27 47/31/39/+11/0.00/0.0/…./.. 32 SSW AERO 30 SSW RMY 34
12/28 The low since midnight is 35F, daily normal minimum is 20F
DAILY RECORDS FOR DECEMBER
12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,
BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 28
HIGH 60 IN 1982
LOW -2 IN 1933
PRECIP 2.16 INS. IN 1967
SNOWFALL 9.5 INS. IN 1967
PEAK GUST 89 MPH SSE IN 1983
RECORDS FOR DECEMBER 29
HIGH 72 IN 1984
LOW -19 IN 1933 (RECORD FOR DECEMBER)
PRECIP 1.91 INS. IN 1945
SNOWFALL 18.4 INS. IN 1945
PEAK GUST 95 MPH S IN 1966 (RECORD FOR DECEMBER)
TODAY’S REPORT PREPARED BY: Benjamin Turner
