Sunday, January 19, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR WEATHER DAY FOLLOWING LAST NIGHT’S
MUCH-NEEDED SNOWFALL….

Last night’s snow measured to 3 inches, which
amounted to 0.37 inches melted down. Weather
conditions early were foggy with a visibility
of 2 miles, but improved as the day went on.
At the 1 P.M. observation, skies were partly
cloudy, and the visibility was 80 miles. One
feature to note was the undercast seen around
8 A.M. Wind also picked up, with a speed of
35 MPH being seen on the gust chart around
noontime.

The high so far today is 39F, 6 degrees above
the normal high of 33F. The low since midnight
is 21F, this is 4 degrees above the normal low
of 17F.

PRELIMINARY STATS FOR DECEMBER 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: 1.64 inches on the 1st-2nd

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: Overcast altostratus, few stratus fractus
Temperature: 23F; Dew Point: 22F; Wind: W at 10 kts
Sea-level pressure: 29.62 ins. Hg, falling, then rising
Visibility: 2 miles, fog
6-hr Max temp: 30F
6-hr Min temp: 21F
24-hr Precip:  0.37 ins.
24-hr Snowfall: 3.0 ins.
Snow depth: 3 ins.
BHO SA 1155 E100 OVC 2F 032/23/22/2810/962/ FEW STFA ALQDS
NEW SNOW PAST 24 HRS 3.0 INS/ 8/72/ 4/003 70037 51004 10030
20021

10 A.M.
Weather: Clear, few distant altostratus
Temperature: 31F; Dew Point: 29F; Wind: Sw at 12 kts
Sea-level pressure: 29.64 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant fog
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 40 039/31/29/2412/964/ FEW AS DSNT FG ALQDS/
8/02/ 53007

1 P.M.
Weather: Scattered cumulus
Temperature: 39F; Dew Point: 25F; Wind: WNW at 17G28,
Peak wind: 35 MPH (30 kts) at 12:10 P.M.
Sea-level pressure: 29.63 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 39F
6-hr Min temp: 23F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow depth: 2 ins
BHO SA 1755 30 SCT 80 034/39/25/2917G28/963/ PK WND
2930/10/ 8/100 4/002 57005 10039 20023

SUMMARY FOR SATURDAY, JANUARY 18, 2020

TEMPERATURE (DEGREES F)
MAX…..28   NORMAL…..33
MIN……8   NORMAL…..17
MEAN….18   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………-7
TOTAL DEPARTURE FOR THE MONTH………………..+164 [+8.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………47  DEPARTURE…….+7
TOTAL HEATING UNITS FOR THE MONTH…………..545  DEPARTURE……-163
TOTAL HEATING UNITS FOR THE SEASON…………2796  DEPARTURE……-216
TOTAL HEATING UNITS LAST SEASON TO DATE…….2953  DEPARTURE……-157

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 WSW AT   1:32 A.M.
AERO…………………….24 ESE AT   8:44 P.M.
ASOS…………………….27 NW  AT   1:37 A.M.
DAVIS……………………27 WSW AT   1:43 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….20 WSW AT   1:40 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 NW  AT   1:49 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 E   AT   8:45 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.7 WSW
ASOS……………………9.2
DAVIS…………………..9.3 S [171 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.37  DEPARTURE……+0.23
ASOS…………..0.37
TOTAL PRECIPITATION FOR THE MONTH……….0.89  DEPARTURE……-1.68
ASOS…………..0.89
TOTAL PRECIPITATION FOR THE YEAR………..0.89  DEPARTURE……-1.68
ASOS…………..0.89

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……… 3.0  DEPARTURE…….+2.5
TOTAL SNOWFALL FOR THE MONTH…………… 4.2  DEPARTURE…….-5.9
TOTAL SNOWFALL FOR THE SEASON…………..24.2  DEPARTURE…….-1.9

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/-13/0.87/5.7/011/02           33 ENE AERO 32 ENE RMY N/A
12/02  37/25/31/-5/1.04/2.7/000/00            52 NE  AERO 47 NE  RMY 53
12/03  30/23/27/-9/0.52/3.1/000/00            32 N   AERO 35 N   RMY 36
12/04  34/22/28/-7/0.00/0.0/000/00            23 WNW AERO 23 NNW RMY N/A
12/05  41/26/34/-1/0.00/0.0/343/62            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/+13/0.62/0.0/000/00           53 S   AERO 52 S   RMY 54
12/10  58/37/48/+15/0.28/0.0/044/08           35 SW  AERO 39 SW  RMY N/A
12/11  36/23/30/-3/0.48/4.8/236/43            25 NW  AERO 25 NW  RMY N/A
12/12  29/17/23/-10/0.00/0.0/488/89           29 W   AERO 30 W   RMY 25
12/13  46/22/34/+2/0.11/0.0/000/00            25 SSE AERO 25 SSE RMY N/A
12/14  58/46/52/+20/1.35/0.0/000/00           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/-2/0.79/1.0/000/00            22 NNW AERO 21 NE  RMY 23
12/18  33/18/26/-5/T/0.0/229/42               44 WNW AERO 45 WNW RMY N/A
12/19  20/9/15/-15/0.00/0.0/534/98            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/+8/0.08/0.0/383/70            22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/1.34/0.8/000/00            40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/0.33/0.0/000/00            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  28/16/22/-4/…./0.0/…/..            43 WNW AERO 40 WNW RMY N/A
01/10  48/23/36/11/T/…./0.0/…/..          37 SW  AERO 37 SW  RMY 39
01/11  65/46/56/+31/…./0.0/…/..           53 SSW AERO 53 SSW RMY N/A
01/12  68/36/52/+27/…./0.0/…/..           60 SSW AERO 62 SSW RMY N/A
01/13  39/31/35/+10/0.01/T/…/..             21 NE  AERO 20 NE  RMY N/A
01/14  38/31/35/+10/0.01/0.0/…/..           16 W   AERO 15 W   RMY N/A
01/15  48/35/42/+17/0.00/0.0/…/..           24 W   AERO 23 W   RMY 24
01/16  42/24/33/+8/0.06/T/…/..              54 W   AERO 52 W   RMY 59
01/17  24/10/17/-8/0.00/0.0/…./..           50 NW  AERO 48 NW  RMY N/A
01/18  28/8/18/-7/0.35/2.8/…./..            28 WSW AERO 24 ESE RMY N/A

01/19 The low since midnight is 21F, daily normal minimum is 17F

DAILY RECORDS FOR JANUARY

1/11/20: DAILY RECORD MAXIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1975.

1/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 46F,
BREAKS PREVIOUS RECORD OF 40F SET IN 1983.

1/12/20: DAILY RECORD MAXIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 60 SET IN 2018.
TIES HIGHEST MAXIMUM FOR JANUARY,
ADDITIONAL 68F ON 1/26/1950.

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

RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978
PEAK GUST 76e MPH NE IN 1978

TODAY’S REPORT PREPARED BY: Benjamin Turner