Wednesday, January 8, 2020

| January 9, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 8, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER FOLLOWING LAST NIGHT’S SNOW WITH
SOME ADDITIONAL SQUALLS IN THE AFTERNOON….

Last night’s snow left 0.7 inches on the snow boards, with
some squalls leaving a trace between 3 P.M. and 4 P.M.
Skies became cloudier, and the wind picked up from the west
as the day went on. The max gust so far today is 38 mph.
Visibility was limited this morning due to a distant fog,
but increased to 65 miles by the 1 P.M. observation.

The high temperature so far today is 38F, 4 degrees above
the daily normal maximum of 34F. The low since midnight is 26F,
which is 8 degrees above the normal low of 18F.

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: Scattered altocumulus, few stratus fractus
Temperature: 26F; Dew Point: 24F; Wind: W at 6 kts,
Wind: Light
Sea-level pressure: 29.80 ins. Hg, falling steadily
Visibility: 30 miles, distant fog
6-hr Max temp: 31F
6-hr Min temp: 26F
24-hr Precip:  0.04 ins.
24-hr Snowfall: 0.7 ins.
BHO SA 1155 70 SCT 30 090/26/24/2606/980/ FEW STFA DSNT FG ALQDS
WND LGT/ 8/770 4/001 70004 58003 10031 20026

10 A.M.
Weather: Broken altocumulus, few cumulus NW-SSW
Temperature: 32F; Dew Point: 29F; Wind: SW at 8 kts
Sea-level pressure: 29.81 ins. Hg, rising, then more slowly
Visibility: 30 miles, distant fog
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E70 BKN 30 094/32/29/2208/981/ FEW CU NW-SSW DSNT
FG ALQDS/ 8/170 51004

1 P.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 38F; Dew Point: 25F; Wind: W at 12G20 kts
Sea-level pressure: 29.75 ins. Hg, falling, then more rapidly
Visibility: 65 miles
6-hr Max temp: 38F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT E250 BKN 65 073/38/25/2812G20/975/ 8/105 56021
10038 20026

SUMMARY FOR TUESDAY, JANUARY 7, 2020

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..34
MIN…..29   NORMAL…..18
MEAN….34   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL………………… +8
TOTAL DEPARTURE FOR THE MONTH…………………+64 [+8.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……. -8
TOTAL HEATING UNITS FOR THE MONTH…………..207  DEPARTURE…….-64
TOTAL HEATING UNITS FOR THE SEASON…………2458  DEPARTURE……-117
TOTAL HEATING UNITS LAST SEASON TO DATE…….2518  DEPARTURE…….-60

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 WSW AT  3:14 A.M.
                   AERO…………………….28 WSW AT  3:17 A.M.
                   ASOS…………………….30 W   AT  3:14 A.M.
                   DAVIS……………………30 W   AT  3:14 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 W   AT  3:10 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W   AT  3:15 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 W   AT  3:14 A.M.
AVERAGE WIND SPEED AND DIRECTION……………9.1 SW
                   ASOS……………………9.6
                   DAVIS………………….10.1 SW [223 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.10
                         ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….0.34  DEPARTURE……-0.66
                         ASOS…………..0.34
TOTAL PRECIPITATION FOR THE YEAR………..0.34  DEPARTURE……-0.66
                         ASOS…………..0.34

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.7  DEPARTURE…….+0.2
TOTAL SNOWFALL FOR THE MONTH…………….1.2  DEPARTURE…….-2.7
TOTAL SNOWFALL FOR THE SEASON…………..21.2  DEPARTURE…….+1.3

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  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  The low since midnight is 26F, daily normal minimum is 9F

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 8
HIGH 65F IN 2008
LOW -8F IN 1968
PRECIP 1.70 INS. IN 1958,1979
SNOWFALL 12.5 INS. IN 1996
PEAK GUST 77 MPH NNW IN 1958

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]

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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