Thursday, January 9, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 9, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
AN ALMOST CLEAR DAY WITH A COLD NORTHWESTERLY
WIND….
Today we observed a visibility increase following an
almost 20 millibar rise in pressure overnight. The
visibility of 65 miles this morning rose to 85 miles
by 1 P.M. Pressure continued to trend upward, leaving
the sky with little to mention as far as cloud cover. A
stiff 20 mph wind has persisted from the northwest,
keeping temperatures cold despite abundant sunshine.
The high temperature so far today is 26F, 8 degrees below
the daily normal maximum of 34F. The low since midnight
is 16F, which is a degree below the normal low of 17F.
PRELIMINARY STATS FOR NOVEMBER 2019
TEMPERATURE, Deg. F
Avg. Max. 39.1 [0.0]
Avg. Min. 25.0 [+1.4]
Mean 32.1 [+0.8]
24-hour corrected mean: 32.3
Max. for month: 58F on the 10th
Min. for month: 9F on the 19th
HEATING DEGREE DAYS
Total heating units: 1014 [-29]
Total for the season: 2251 [-54]
Total for last season: 2295
PRECIPITATION, Inches
Total: 7.81 [+2.92]
Greatest in 24 hrs: N/A
SNOWFALL, Inches
Total: 19.9 [+6.5]
Greatest in 24 hrs: 5.8 ins. on the 1st-2nd
WIND, mph
Avg. uncorrected wind speed: 13.2 mph
Avg. corrected wind speed: 13.6 mph
Prevailing wind direction: W [20%]
Peak gust and direction: 53 S,W on the 9th, 15th
SUNSHINE:
Campbell-Stokes card minutes: 6168 minutes of possible 16470 or 37%
Astronomical total minutes: 6368 minutes of possible 17000 or 37%
Today’s Observations:
7 A.M.
Weather: Clear, few distant cumulus
Temperature: 16F; Dew Point: 5F; Wind: WNW at 13G22 kts
Sea-level pressure: 30.51 ins. Hg, rising quickly
Visibility: 65 miles
6-hr Max temp: 21F
6-hr Min temp: 16F
24-hr Precip: 0.01 ins.
24-hr Snowfall: Trace
BHO SA 1155 CLR 65 333/16/5/2913G22/051/ FEW DSNT CU
ALQDS/ 8/100 53052 10021 20016
10 A.M.
Weather: Clear, few distant cumulus
Temperature: 17F; Dew Point: 5F; Wind: WNW at 10G20 kts
Sea-level pressure: 30.65 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 80 380/17/5/2910G20/065/ FEW DSNT CU ALQDS/
8/100 51047
1 P.M.
Weather: Clear, few cirrostratus
Temperature: 26F; Dew Point: 5F; Wind: W at 12G21 kts
Sea-level pressure: 30.63 ins. Hg, rising then falling
Visibility: 85 miles
6-hr Max temp: 26F
6-hr Min temp: 16F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 85 375/26/5/3012G21/063/ FEW DSNT CS ALQDS/
8/005 58005 10026 20016
SUMMARY FOR WEDNESDAY, JANUARY 8, 2020
TEMPERATURE (DEGREES F)
MAX…..39 NORMAL…..34
MIN…..22 NORMAL…..18
MEAN….31 NORMAL…..26
DEPARTURE FROM 30-YEAR NORMAL………………… +5
TOTAL DEPARTURE FOR THE MONTH…………………+69 [+8.4 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34 DEPARTURE……. -5
TOTAL HEATING UNITS FOR THE MONTH…………..241 DEPARTURE…….-69
TOTAL HEATING UNITS FOR THE SEASON…………2492 DEPARTURE……-123
TOTAL HEATING UNITS LAST SEASON TO DATE…….2551 DEPARTURE…….-59
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..50 W AT 8:48 P.M.
AERO…………………….46 WNW AT 3:32 P.M.
ASOS…………………….51 WNW AT 9:17 P.M.
DAVIS……………………49 W AT 5:30 P.M. RMY 47
FASTEST MILE FOR YESTERDAY………………….39 W AT 9:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….36 WNW AT 8:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………39 W AT 8:48 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.2 W
ASOS…………………..13.1
DAVIS………………….14.5 WNW [284 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01 DEPARTURE……-0.13
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.35 DEPARTURE……-0.79
ASOS…………..0.35
TOTAL PRECIPITATION FOR THE YEAR………..0.35 DEPARTURE……-0.79
ASOS…………..0.35
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..TRACE DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………….1.2 DEPARTURE…….-3.3
TOTAL SNOWFALL FOR THE SEASON…………..21.2 DEPARTURE…….+0.7
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/-8/0.00/0.0/402/73 31 SSW AERO 32 SSW RMY N/A
12/09 57/36/47/+13/…./0.0/000/00 53 S AERO 52 S RMY 54
12/10 58/37/48/+15/…./0.0/044/08 35 SW AERO 39 SW RMY N/A
12/11 36/23/30/-3/…./3.0/236/43 25 NW AERO 25 NW RMY N/A
12/12 29/17/23/-10/…./1.8/488/89 29 W AERO 30 W RMY 25
12/13 46/22/34/+2/…./0.0/000/00 25 SSE AERO 25 SSE RMY N/A
12/14 58/46/52/+20/…./0.0/000/00 45 S AERO 41 S RMY N/A
12/15 48/28/38/+6/0.00/0.0/284/52 53 W AERO 53 W RMY 50
12/16 30/25/28/-3/0.00/0.0/000/00 36 W AERO 36 W RMY N/A
12/17 35/23/29/-2/…./1.0/000/00 22 NNW AERO 21 NE RMY 23
12/18 33/18/26/-5/…/0.0/229/42 44 WNW AERO 45 WNW RMY N/A
12/19 20/9/15/-15/…/0.0/534/98 51 W AERO 47 W RMY N/A
12/20 29/11/20/-10/0.00/0.0/540/99 32 W AERO 30 W RMY 29
12/21 31/16/24/-6/0.00/0.0/163/30 16 SSE AERO 15 SSE RMY N/A
12/22 40/26/33/+4/0.00/0.0/212/39 23 SW AERO 21 SW RMY 23
12/23 54/33/44/+15/0.00/0.0/540/99 30 WSW AERO 30 SW RMY 30
12/24 42/29/36/+7/0.00/0.0/507/93 30 NW AERO 27 NW RMY 30
12/25 42/25/34/+6/0.00/0.0/289/53 16 NNE AERO 16 N RMY N/A
12/26 39/29/34/+6/0.00/0.0/174/32 22 ENE AERO 20 ENE RMY 22
12/27 47/31/39/+11/0.00/0.0/000/00 32 SSW AERO 30 SSW RMY 34
12/28 47/30/39/+11/0.00/0.0/470/86 23 W AERO 22 W RMY N/A
12/29 42/28/35/+8/…./0.0/383/70 22 WNW AERO 21 WNW RMY 23
12/30 36/32/34/+7/…./0.8/000/00 40 E AERO 37 E RMY 37
12/31 40/32/36/+9/…./0.0/000/00 35 E AERO 32 E RMY N/A
DAILY RECORDS FOR DECEMBER
12/01/19: DAILY RECORD SNOWFALL OF 5.8 INS.,
BREAKS PREVIOUS RECORD OF 2.0 INS. SET IN 1902.
PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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
01/01 38/30/34/+7/…./0.0/…./.. 39 W AERO 38 W RMY 41
01/02 46/29/38/+11/0.00/0.0/…./.. 28 SW AERO 28 SW RMY 30
01/03 46/40/43/+17/0.00/0.0/…./.. 21 SW AERO 18 SW RMY N/A
01/04 46/36/41/+15/…./0.0/…./.. 16 NNW AERO 16 NNW RMY N/A
01/05 36/24/30/+4/…./0.5/…./.. 43 NW AERO 46 NW RMY 43
01/06 33/23/28/+2/T/T/…./.. 26 W AERO 21 W RMY N/A
01/07 38/29/34/+8/…./0.4/…/.. 30 WSW AERO 28 WSW RMY N/A
01/08 39/22/31/+5/…./0.4/…/.. 50 W AERO 46 WNW RMY 47
01/09 The low since midnight is 16F, daily normal minimum is 17F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JANUARY 9
HIGH 62F IN 1937
LOW -9F IN 1968
PRECIP 3.00 INS. IN 1956
SNOWFALL 10.0 INS. IN 1904
PEAK GUST 101e MPH SE IN 1978 [RECORD FOR MONTH]
RECORDS FOR JANUARY 10
HIGH 58F IN 2016
LOW -7F IN 2004
PRECIP 2.16 INS. IN 1935
SNOWFALL 6.3 INS. IN 1977
PEAK GUST 73e SE IN 1977
TODAY’S REPORT PREPARED BY: Benjamin Turner
