Thursday, January 3, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 3, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT SNOW AND RAIN IN THE MORNING WITH SKIES
CLEARING UP IN THE AFTERNOON….

Today started overcast with light snow and rain between
6 A.M. and 9 A.M. This left only 0.01 inches in the rain
gauge. Cloud cover started to decrease around the 10 A.M.
observation, allowing the sun to bring temperatures to a
maximum of 42F so far today. This is 7 degrees above the normal
high of 35F. Ponds remain less than half frozen for the
majority of the day, freezing slightly overnight. A wind
shift from SSW to NW was observed between the 10 A.M. and
1 P.M. observations.

Today’s Observations:

7 A.M.
Weather: Overcast stratocumulus, light snow ending
before time of observation
Temperature: 34F; Dew Point: 32F; Wind: SE at 14G19 kts
Sea-level pressure: 29.87 ins. Hg, falling, then less rapidly
Visibility: 20 miles, smoke layer
6-hr Max temp: 34F
6-hr Min temp: 28F
24-hr Precip: Trace
24-hr snowfall: Trace
Snow depth: 0 ins.
BHO SA 1155 E25 OVC 20 116/34/32/1514G19/987/ K LYR ALQDS
S-B40E50/ 8/4// 700// 56029 10034 20028

10 A.M.
Weather: Broken stratocumulus, few stratus fractus
Temperature: 34F; Dew Point: 34F; Wind: WSW at 9G12 kts
Sea-level pressure: 29.87 ins. Hg, steady
Visibility: 40 miles, thin smoke layer
3-hr Precip: 0.01 ins.
BHO SA 1455 E50 OVC 40 116/34/34/2509G12/987/ FEW STFA THN K
LYR ALQDS/ 8/400 6001/ 52000

1 P.M.
Weather: Broken stratocumulus
Temperature: 42F; Dew Point: 37F; Wind: WNW at 12G22 kts
Sea-level pressure: 29.82 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 33F
6-hr Precip: 0.01 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 E35 OVC 70 098/42/37/3012G22/982/ 8/400 6001/
56018 10042 20033

SUMMARY FOR WEDNESDAY, JANUARY 2, 2019

TEMPERATURE (DEGREES F)
MAX…..34   NORMAL…..35
MIN…..24   NORMAL…..19
MEAN….29   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL……………………+2
TOTAL DEPARTURE FOR THE MONTH…………………..+17 [+8.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..36   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..59   DEPARTURE……..-18
TOTAL HEATING UNITS FOR THE SEASON………..2355   DEPARTURE……..-26
TOTAL HEATING UNITS LAST SEASON TO DATE……2242   DIFFERENCE……+113

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 NW AT 3:12 A.M.
AERO…………………….22 NW AT 2:40 A.M.
ASOS…………………….23 NW AT 3:12 A.M.
DAVIS……………………24 NW AT 3:11 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….16 NW AT 2:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 NW AT 3:12 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 NW AT 3:11 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.3 NNW
ASOS…………………..8.1
DAVIS………………….8.7 NNW [334 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.81  DEPARTURE…….+0.52
ASOS…………..0.79
TOTAL PRECIPITATION FOR THE YEAR………..0.81  DEPARTURE…….+0.79
ASOS…………..0.79

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-1.1
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE……..-9.4

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 41/28/35/-2/0.00/0.0/391/70          20 NNW AERO 18 NNW RMY N/A
12/02 52/35/44/+8/1.04/0.0/000/00          28 ESE AERO 25 ESE RMY 27
12/03 54/38/46/+10/0.00/0.0/178/32         35 W   AERO 35 W   RMY 38
12/04 38/23/31/-4/0.00/0.0/516/93          30 WNW AERO 31 WNW RMY 33
12/05 33/18/26/-9/0.00/0.0/432/78          16 NNW AERO 15 NNW RMY N/A
12/06 37/24/31/-4/0.00/0.0/354/64          29 W   AERO 28 W   RMY 30
12/07 37/21/29/-5/0.00/0.0/546/99          29 NW  AERO 29 NW  RMY 32
12/08 27/15/21/-13/0.00/0.0/518/94         28 NW  AERO 27 NW  RMY 29
12/09 34/17/26/-8/0.00/0.0/391/71          23 SSW AERO 21 SSW RMY 22
12/10 36/22/29/-4/0.00/0.0/544/99          24 NNW AERO 23 NNW RMY 22
12/11 36/17/27/-6/0.00/0.0/543/99          16 WSW AERO 14 WSW RMY N/A
12/12 35/18/27/-6/0.00/0.0/471/86          30 NW  AERO 29 NW  RMY M
12/13 31/16/24/-8/0.00/0.0/088/16          16 NNE AERO 12 SE  RMY N/A
12/14 46/28/37/+5/0.00/0.0/399/73          28 SSW AERO 28 SSW RMY 29
12/15 49/33/43/+11/0.04/0.0/000/00         28 NE  AERO 27 NE  RMY 30
12/16 40/37/39/+8/…./0.0/000/00          38 NE  AERO 38 NE  RMY 40
12/17 37/32/35/+4/…./0.0/000/00          39 NNE AERO 37 NNE RMY N/A
12/18 34/20/27/-4/0.02/0.1/456/86          48 NW  AERO 55 NW  RMY 48
12/19 38/17/28/-2/0.00/0.0/486/92          23 WNW AERO 23 WNW RMY N/A
12/20 47/30/39/+9/0.00/0.0/300/57          23 SW  AERO 22 SW  RMY N/A
12/21 62/43/53/+23/…./0.0/000/00         60 SSE AERO 62 SSE RMY 63
12/22 54/31/43/+14/…./0.0/108/21         41 W   AERO 45 W   RMY 43
12/23 38/27/33/+4/0.00/0.0/522/99         30 WNW AERO 32 WNW RMY N/A
12/24 34/27/31/+2/0.01/T/108/21            21 W   AERO 21 W   RMY N/A
12/25 35/23/29/+1/0.00/0.0/516/98          28 NW  AERO 28 NW  RMY 29
12/26 36/20/28/0/0.00/0.0/480/91           24 NW  AERO 24 NW  RMY 25
12/27 35/26/31/+3/0.00/0.0/…/..          23 NW  AERO 22 NW  RMY N/A
12/28 54/30/42/+14/…./0.0/…/..         44 SSW AERO M  M   RMY 47
12/29 54/30/42/+15/…./…/…/..         38 WNW AERO 38 WNW RMY 38
12/30 33/23/28/+1/0.00/0.0/…/..          24 NNW AERO 21 NNW RMY 17
12/31 41/28/35/+8/…./T/…/..            33 SSE AERO 32 SSE 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 54/29/42/+15/…./0.0/…/..         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/…../…/…/..         22 NW  AERO 22 NW  RMY N/A

01/03 Low temp since midnight is 28F; normal low is 18F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JANUARY 3
HIGH 64F IN 2000
LOW -4F IN 1904
PRECIP 1.93 INS. IN 1999
SNOW 11.3 INS. 1996
PEAK GUST 92 MPH S IN 1960

RECORDS FOR JANUARY 4
HIGH 60F IN 2000
LOW -8F IN 1904, 1981
PRECIP 1.79 INS. IN 1982
SNOW 16.5 INS. IN 2018
PEAK GUST 84 MPH S IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner and Nick Rousseau