Monday, January 6, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 6, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

PERIOD OF LIGHT SNOW HAS DEVELOPED INTO EARLY THIS AFTERNOON…

After a bit of sun this morning, clouds have once again over-
spread the area bringing with them some light snow, as a cold
front approaches the region. So far the snow hasn’t amounted
to anything more than a dusting.

After a busy wind day yesterday, today is the total opposite
with speeds of 12 mph or less most of the day.

Today has definitely been the coldest day in about 2 weeks with
a high so far of only 33F. This is 1 degree below the daily normal
maximum of 34F. The low since midnight is 23F, which is 5 degrees
above the normal low of 18F.

Today’s Observations:

7 A.M.
Weather: Overcast altocumulus, stratocumulus offshore distant
NNE-ESE
Temperature: 25F; Dew Point: 14F; Wind: SE at 3 kts
Sea-level pressure: 29.94 ins. Hg, falling then rising
Visibility: 60 miles
6-hr Max temp: 25F
6-hr Min temp: 23F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E80 OVC 60 139/25/14/1303/994/ FEW BINOVC N-E AND SE
SC OFFSHR DSNT NNE-ESE WND LGT/ 8/57/ 53005 10025 20023

10 A.M.
Weather: Broken altocumulus, broken cirrus
Temperature: 32F; Dew Point: 19F; Wind: S at 5 kts
Sea-level pressure: 29.96 ins. Hg, rising then falling
Visibility: 50 miles, 20 miles to the SW, 30 to the W-NW
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E65 BKN 250 BKN 50 144/32/19/1805/996/ SNW SHWRS SW-W
MVG E VSBY SW 20 W-WNW 30 WND LGT/ 8/071 50005

1 P.M.
Weather: Overcast stratus, light snow
Temperature: 32F; Dew Point: 20F; Wind: SSW at 8 kts
Sea-level pressure: 29.90 ins. Hg, falling, then more slowly
Visibility: 10 miles
6-hr Max temp: 33F
6-hr Min temp: 25F
6-hr Precip:   Trace
6-hr Snowfall: Trace
BHO SA 1755 E20 OVC 10S- 125/32/20/2008/990/ TOTAL NEW SNW LAST 6
HRS TRACE/ 8/6// 56019 6000 10033 20025

SUMMARY FOR SUNDAY, JANUARY 5, 2020

TEMPERATURE (DEGREES F)
MAX…..36   NORMAL…..34
MIN…..24   NORMAL…..18
MEAN….30   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL………………… +4
TOTAL DEPARTURE FOR THE MONTH…………………+54 [+10.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……. -4
TOTAL HEATING UNITS FOR THE MONTH…………..139  DEPARTURE…….-54
TOTAL HEATING UNITS FOR THE SEASON…………2390  DEPARTURE……-107
TOTAL HEATING UNITS LAST SEASON TO DATE…….2440  DEPARTURE…….-50

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..43 NW  AT 11:43 A.M.
AERO…………………….46 NW  AT 11:43 A.M.
ASOS…………………….44 NW  AT 11:41 A.M.
DAVIS……………………43 WNW AT 11:26 A.M. RMY 43
FASTEST MILE FOR YESTERDAY………………….34 NW  AT 11:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 NW  AT 11:48 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………34 WNW AT 11:45 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.4 NW
ASOS…………………..15.4
DAVIS………………….16.1 NW [309 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……….0.30  DEPARTURE……-0.42
ASOS…………..0.31
TOTAL PRECIPITATION FOR THE YEAR………..0.30  DEPARTURE……-0.42
ASOS…………..0.31

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.5  DEPARTURE…….-2.3
TOTAL SNOWFALL FOR THE SEASON…………..20.5  DEPARTURE…….+1.7

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/…./..           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  47/30/39/+11/0.00/0.0/…./..          23 W   AERO 22 W   RMY N/A
12/29  42/28/35/+8/…./0.0/…./..           22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/…./0.8/…./..           40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/…./0.0/…./..           35 E   AERO 32 E   RMY N/A

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  The low since midnight is 23F, daily normal minimum is 18F

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 JANUARY 6
HIGH 66F IN 2007
LOW -14F IN 1896
PRECIP 3.10 INS. IN 1889 [RECORD FOR MONTH] SNOWFALL 7.5 INS. IN 1893
PEAK GUST 70 MPH WNW IN 1959

RECORDS FOR JANUARY 7
HIGH 60F IN 1930
LOW -8F IN 2018
PRECIP 1.97 INS. IN 1977
SNOWFALL 16.0 INS. IN 1977
PEAK GUST 74 MPH NW IN 1968

TODAY’S REPORT PREPARED BY: Matt Douglas