Thursday, January 2, 2020

| January 2, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 2, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

MILDER WITH INCREASING VISIBILITY AND
DECREASING CLOUDS….

Today we observed partly cloudy weather with
lighter winds in comparison to yesterday.
Wind was southwesterly with an average speed
of 15 mph, and a max gust of 30 mph happening
much later in the afternoon. Cloud cover went
down as the day went on, going from overcast
this morning to less than 2/8ths by the 1 P.M.
observation. Visibility was again limited by
a distant haze that dissipated slightly in the
afternoon, allowing the observer to see 60
miles.  

Total rainfall for last year was 56.89 inches,
which is 3.45 inches more than the normal annual
amount. We experienced 20 inches of snowfall so
far this season, with 19.9 inches of it falling
in December. That is 4 inches above normal for the
first 2 months of winter.

Temperatures were again slightly milder today,
thanks to abundant sunshine this afternoon.
The low since midnight is 29F, 10 degrees above the
normal low of 19F. The high so far today is 38F,
3 degrees above the daily normal maximum of 35F.  

Today’s Observations:

7 A.M.
Weather: Overcast altocumulus
Temperature: 29F; Dew Point: 22F; Wind: SW at 10G16 kts
Sea-level pressure: 29.89 ins. Hg, falling, then rising
Visibility: 35 miles, distant haze
6-hr Max temp: 31F
6-hr Min temp: 29F
24-hr Precip:  0.0 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E180 OVC 35 124/29/22/2310G16/989/ DSNT HZ
ALQDS/ 8/07/ 53016 10031 20029

10 A.M.
Weather: Broken altocumulus and cirrostratus
Temperature: 34F; Dew Point: 22F; Wind: SW at 10 kts
Sea-level pressure: 29.92 ins. Hg, falling then rising
Visibility: 40 miles, distant haze
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E160 BKN 250 BKN 40 134/34/22/2310/992/ DSNT HZ
ALQDS/ 8/078 51010

1 P.M.
Weather: Scattered altocumulus and cirrostratus
Temperature: 42F; Dew Point: 22F; Wind: SSW at 11G20 kts
Sea-level pressure: 29.86 ins. Hg, falling, then more slowly
Visibility: 60 miles
6-hr Max temp: 44F
6-hr Min temp: 29F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 180 SCT 250 SCT 60 115/42/22/2211G20/986/ 8/078
58019 10044 20029

SUMMARY FOR WEDNESDAY, JANUARY 1, 2020

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..35
MIN…..30   NORMAL…..19
MEAN….34   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL………………….+7
TOTAL DEPARTURE FOR THE MONTH………………….+7 [+6.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH……………31  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE SEASON…………2282  DEPARTURE…….-61
TOTAL HEATING UNITS LAST SEASON TO DATE…….2318  DEPARTURE…….-36

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..39 W   AT 12:01 P.M.
                   AERO…………………….38 W   AT 12:01 P.M.
                   ASOS…………………….39 WNW AT 12:00 P.M.
                   DAVIS……………………41 WNW AT 11:58 A.M. RMY 41
FASTEST MILE FOR YESTERDAY………………….29 W   AT 11:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 W   AT 11:30 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 W   AT 11:29 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..16.4 W
                   ASOS…………………..15.7
                   DAVIS………………….16.9 W [274 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
                         ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.15
                         ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR………..0.00  DEPARTURE……-0.15
                         ASOS…………..0.00

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE SEASON…………..20.0  DEPARTURE…….+3.4

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/-8/0.00/0.0/402/73            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  The low since midnight is 30F, daily normal minimum is 19F

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 2
HIGH 62F IN 1890
LOW -7F IN 1899,1918
PRECIP 2.10 INS. IN 1987
SNOWFALL 9.0 INS. IN 1904
PEAK GUST 85e MPH S IN 1942

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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