Monday, January 13, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 13, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

BACK TO REALITY AFTER RECORD WARMTH OVER THE WEEKEND….

Yesterday brought the second day in a row of record high
temperatures. The high yesterday topped out at 68 degrees,
which not only was a record for the day, but also tied for the
highest temperature ever recorded in the month of January. The
old record for yesterday was 60 degrees set in 2018. The only
other January day to reach 68 degrees was January 26, 1950.

Along with the warm temperatures yesterday was yet another day
of strong winds. Peak gust for the day was officially 60 mph out
of the south-southwest at 4:41 A.M.

Today was a stark contrast of the last couple of days with cloudy
skies and temperatures holding in the 30s. Even a period of light
snow occurred this morning thanks to some ocean effect moisture
moving onshore. A light easterly wind has been the theme today
as well.

The high for today is 39 degrees, this is 6 degrees above the
normal high of 33 degrees. The low since midnight is 31 degrees,
this is 14 degrees above the normal low of 17 degrees.

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: 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: Overcast stratus fractus, light snow and fog
Temperature: 31F; Dew Point: 29F; Wind: E at 9 kts,
Sea-level pressure: 30.50 ins. Hg, rising, then falling
Visibility: 5 miles
6-hr Max temp: 35F
6-hr Min temp: 31F
24-hr Precip:  0.01 ins.
24-hr Snowfall: Trace.
BHO SA 1155 E12 OVC 5S-F 328/31/29/0909/050/ VSBY NNW-ENE 4
SE-WSW 6 TOTAL NEW SNW PAST 24HRS TRACE/ 8/7// 50008 6000
70001 10035 20031

10 A.M.
Weather: Overcast stratus fractus, light drizzle and fog
Temperature: 34F; Dew Point: 33F; Wind: E at 6 kts,
Sea-level pressure: 30.50 ins. Hg, rising, then falling
Visibility: 3 miles
3-hr Precip:   Trace.
3-hr Snowfall: Trace.
BHO SA 1455 E4 OVC 3L-F 328/34/33/0806/050/ VSBY ESE-SW 4
NNW-NE 2 PCPN VRY LGT WND LGT SEUKNLBUKN/ 8/7// 58000

1 P.M.
Weather: Overcast stratocumulus
Temperature: 38F; Dew Point: 33F; Wind: Calm
Sea-level pressure: 30.44 ins. Hg, falling, then more slowly
Visibility: 15 miles
6-hr Max temp: 38F
6-hr Min temp: 31F
6-hr Precip:   Trace.
6-hr Snowfall: Trace.
BHO SA 1755 E12 OVC 15 308/38/33/0000/044/ WND CALM/ 8/5// 56020
6000 10038 20031

SUMMARY FOR SUNDAY, JANUARY 12, 2020

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..34
MIN…..36   NORMAL…..17
MEAN….52   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………+27
TOTAL DEPARTURE FOR THE MONTH………………..+134 [+10.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………13  DEPARTURE…….-27
TOTAL HEATING UNITS FOR THE MONTH…………..335  DEPARTURE……-133
TOTAL HEATING UNITS FOR THE SEASON…………2584  DEPARTURE……-187
TOTAL HEATING UNITS LAST SEASON TO DATE…….2711  DEPARTURE……-125

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..60 SSW AT 4:41 A.M.
AERO…………………….62 SSW AT 4:41 A.M.
ASOS…………………….64 S   AT 5:08 A.M.
DAVIS……………………63 SSW AT 4:35 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….45 SSW AT 5:55 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….41 SSW AT 4:40 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………41 SSW AT 5:43 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..23.5 SSW
ASOS…………………..21.9
DAVIS………………….22.5 WSW [243 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….0.44  DEPARTURE……-1.27
ASOS…………..0.98
TOTAL PRECIPITATION FOR THE YEAR………..0.44  DEPARTURE……-1.27
ASOS…………..0.98

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……..Trace  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….1.2  DEPARTURE…….-5.5
TOTAL SNOWFALL FOR THE SEASON…………..21.2  DEPARTURE…….-1.5

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/+4/0.00/0.0/212/39            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/…./0.0/383/70            22 WNW AERO 21 WNW RMY 23
12/30  36/32/34/+7/…./0.8/000/00            40 E   AERO 37 E   RMY 37
12/31  40/32/36/+9/…./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 The low since midnight is 31F, 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 13
HIGH 60F IN 2018
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964

RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005

TODAY’S REPORT PREPARED BY: Matt Douglas