Wednesday, December 25, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, DECEMBER 25, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
FAIR AND SEASONABLE WEATHER CONTINUES FOR ANOTHER DAY…
After high cloudiness passed through this morning, increasing
amounts of sunshine has been the theme as early afternoon
has progressed. Light wind and an inversion has lead to some-
what limited visibility today. The stagnant air has been full
of smoke and haze.
Definitely can’t complain about the temperatures for late
December, the high so far today is 41F, which is 5 degrees
above the daily normal maximum of 36F. The low since midnight
is 25F, which is 4 degrees above the normal minimum of 21F.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus, thin broken cirrus
Temperature: 28F; Dew Point: 19F; Wind: N at 7 kts
Sea-level pressure: 30.21 ins. Hg, falling, then rising
Visibility: 50 miles
6-hr Max temp: 28F
6-hr Min temp: 26F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: Trace
BHO SA 1155 E150 BKN 250 –BKN 50 229/28/19/3507/021/
THN K LYR ALNG HRZN ALQDS HAZY/ 8/071 50003 10028 20026
10 A.M.
Weather: Broken altocumulus
Temperature: 34F; Dew Point: 22F; Wind: Calm at 0 kts,
Sea-level pressure: 30.25 ins. Hg, rising, then more slowly
Visibility: 50 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E150 BKN 50 244/34/22/0000/025/ THN K LYR
ALNG HRZN ALQDS HAZY WND CALM/ 8/070 51015
1 P.M.
Weather: Thin broken cirrus, few stratocumulus NE-SE, few
dense cirrus NE-SE
Temperature: 41F; Dew Point: 25F; Wind: S at 5 kts
Sea-level pressure: 30.17 ins. Hg, falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 41F
6-hr Min temp: 25F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: Trace
BHO SA 1755 E250 –BKN 60 217/41/25/1805/017/ FEW SC
DSNT NE-SE FEW DENSE CI NE-SE HAZY WND LGT/ 8/502
58027 10041 20025
SUMMARY FOR TUESDAY, DECEMBER 24, 2019
TEMPERATURE (DEGREES F)
MAX…..42 NORMAL…..37
MIN…..29 NORMAL…..21
MEAN….36 NORMAL…..29
DEPARTURE FROM 30-YEAR NORMAL………………….+7
TOTAL DEPARTURE FOR THE MONTH…………………-31 [-1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………29 DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………..810 DEPARTURE…….+28
TOTAL HEATING UNITS FOR THE SEASON…………2047 DEPARTURE……..+4
TOTAL HEATING UNITS LAST SEASON TO DATE…….2075 DEPARTURE…….-28
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 NW AT 8:41 A.M.
AERO…………………….27 NW AT 7:28 A.M.
ASOS…………………….29 NW AT 8:41 A.M.
DAVIS……………………30 NW AT 8:39 A.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….21 NW AT 8:31 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 NW AT 9:06 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 NW AT 8:31 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.9 NW
ASOS…………………..11.4
DAVIS………………….11.3 NW [326 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.06 DEPARTURE……+2.19
ASOS…………..6.51
TOTAL PRECIPITATION FOR THE YEAR……….55.14 DEPARTURE……+2.73
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…….+9.4
TOTAL SNOWFALL FOR THE SEASON…………..19.2 DEPARTURE…….+6.9
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 The low since midnight is 25F, daily normal minimum is 21F
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 25
HIGH 64 IN 2015
LOW -11 IN 1980
PRECIP 1.37 INS. IN 2002
SNOWFALL 8.5 INS. IN 2002
PEAK GUST 80 MPH NW IN 1971
RECORDS FOR DECEMBER 26
HIGH 58 IN 1973,1982
LOW -12 IN 1980
PRECIP 3.64 INS. IN 1969
SNOWFALL 17.5 INS. IN 1909
PEAK GUST 84 MPH SSE IN 1957
TODAY’S REPORT PREPARED BY: Matt Douglas
