Tuesday, February 11, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS, RAIN, AND FOG DOMINATE THE DAY HERE AT BLUE HILL…

Another dreary day here with dense fog as well as periods
of drizzle and light rain. Rainfall for 24 hours ending at
7 A.M. totaled 0.13″, an additional 0.08″ had fallen by
the 1 P.M. observation.

Visibility has been generally between 1/4 and 1/8 of a mile
in dense fog, but has dipped as low as 1/16 of a mile for a
time.

Contrary to yesterday, there hasn’t been much of any wind to
speak of today, generally hanging out under 10 mph. We did
manage a brief gust to 23 mph around 10:38 A.M that seem to
come out of no where relative to the rest of the day.

The high so far today is 40F, 4 degrees above the normal
high of 36F. The low since midnight is 37F, 19 degrees
above the normal low of 18F.

PRELIMINARY STATS FOR JANUARY 2020

TEMPERATURE, Deg. F
Avg. Max. 40.6 [+6.8] Avg. Min. 25.9 [+8.8] Mean      33.3 [+7.8] 24-hour corrected mean: 32.8
Max. for month: 68F on the 12th
Min. for month: 8F on the 18th

HEATING DEGREE DAYS
Total heating units:    978 [-248] Total for the season:  3229 [-302] Total for last season: 3495

PRECIPITATION, Inches
Total: 1.46 [-2.89] Greatest in 24 hrs: 0.57 inches on the 25th

SNOWFALL, Inches
Total: 4.2 [-12.9] Greatest in 24 hrs: 3.0 ins. on the 18th-19th

WIND, mph
Avg. uncorrected wind speed: 12.3 mph
Avg. corrected wind speed:   12.8 mph
Prevailing wind direction:   W [19%] Peak gust and direction:     60 SSW on the 12th

SUNSHINE:
Campbell-Stokes card minutes: 8388 minutes of possible 17130 or 49%
Astronomical total minutes: 8642 minutes of possible 17639 or 49%

JANUARY 2020 RANKED 9TH WARMEST ON RECORD!
Warmest 24-Hour Adjusted Mean Temperature, deg F (1886-2020):

1) 35.6 in 1913
2) 35.0 in 1932
3) 34.6 in 1937
4) 33.9 in 2006
5) 33.8 in 1933
33.8 in 1950
33.8 in 1990
8) 33.5 in 2002
9) 32.8 in 2020
10) 32.7 in 2017

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200 ft, light drizzle
Temperature: 39F; Dew Point: 39F; Wind: NE at 5 kts,
Relative Humidity: 100%
Sea-level pressure: 30.06 ins. Hg: rising then falling
Visibility: 1/4 mile, fog
6-hr Max temp: 40F
6-hr Min temp: 38F
24-hr Precip:  0.13 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 X W2 1/4L-F 180/39/39/0505/006/ WND LGT/ 8////
58006 70013 10040 20038

10 A.M.
Weather: Sky obscured, vertical visibility 200 ft, light drizzle
Temperature: 38F; Dew Point: 38F; Wind: ENE at 5 kts,
Relative Humidity: 100%
Sea-level pressure: 30.00 ins. Hg: falling, then more rapidly
Visibility: 1/8 mile, fog
3-hr Precip:  0.02 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W2 1/8L-F 160/38/38/0705/000/ PCPN VRY LGT WND LGT/
8//// 58020 6002

1 P.M.
Weather: Sky obscured, vertical visibility 200 ft, light rain
Temperature: 39F; Dew Point: 39F; Wind: N at 3 kts,
Relative Humidity: 100%
Sea-level pressure: 29.86 ins. Hg: falling, then more rapidly
Visibility: 1/4 mile, fog
6-hr Max temp: 40F
6-hr Min temp: 37F
6-hr Precip:  0.08 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 X W2 1/4R-F 111/39/39/3603/986/ WND LGT RBUKN/ 8////
58049 6008 10040 20037

SUMMARY FOR MONDAY, FEBRUARY 10, 2020

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..36
MIN…..33   NORMAL…..18
MEAN….38   NORMAL…..27

DEPARTURE FROM 30-YEAR NORMAL……………….+11
TOTAL DEPARTURE FOR THE MONTH……………….+78 [+7.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………27  DEPARTURE…….+11
TOTAL HEATING UNITS FOR THE MONTH…………..308  DEPARTURE…….-79
TOTAL HEATING UNITS FOR THE SEASON…………3537  DEPARTURE……-381
TOTAL HEATING UNITS LAST SEASON TO DATE…….3825  DEPARTURE……-288

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..39 SSW AT 08:32 A.M.
AERO…………………….39 SSW AT 08:32 A.M.
ASOS…………………….39 SSW AT 08:32 A.M.
DAVIS……………………38 SW  AT 08:29 A.M. RMY 39
FASTEST MILE FOR YESTERDAY………………….32 SSW AT 08:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….29 SSW AT 10:16 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………30 SSW AT 08:32 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..15.9 SW
ASOS…………………..15.7
DAVIS………………….15.4 SW [214 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.13  DEPARTURE……-0.01
ASOS…………..0.17
TOTAL PRECIPITATION FOR THE MONTH……….1.10  DEPARTURE……-0.26
ASOS…………..1.17
TOTAL PRECIPITATION FOR THE YEAR………..2.56  DEPARTURE……-3.15
ASOS…………..2.71

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.1  DEPARTURE…….-4.8
TOTAL SNOWFALL FOR THE SEASON…………..24.3  DEPARTURE……-13.7

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/+7/0.00/0.0/400/73           39 W   AERO 38 W   RMY 41
01/02  46/29/38/+11/0.00/0.0/269/49          28 SW  AERO 28 SW  RMY 30
01/03  46/40/43/+17/0.00/0.0/000/00          21 SW  AERO 18 SW  RMY N/A
01/04  46/36/41/+15/0.15/0.0/000/00          16 NNW AERO 16 NNW RMY N/A
01/05  36/24/30/+4/0.15/0.5/116/21           43 NW  AERO 46 NW  RMY 43
01/06  33/23/28/+2/T/T/133/24                26 W   AERO 21 W   RMY N/A
01/07  38/29/34/+8/0.01/0.4/161/29           30 WSW AERO 28 WSW RMY N/A
01/08  39/22/31/+5/0.04/0.4/350/63           50 W   AERO 46 WNW RMY 47
01/09  28/16/22/-4/0.00/0.0/540/97           43 WNW AERO 40 WNW RMY N/A
01/10  48/23/36/+11/T/T/106/19               37 SW  AERO 37 SW  RMY 39
01/11  65/46/56/+31/0.00/0.0/408/73          53 SSW AERO 53 SSW RMY N/A
01/12  68/36/52/+27/0.09/0.0/297/53          60 SSW AERO 62 SSW RMY N/A
01/13  39/31/35/+10/0.01/T/000/00            21 NE  AERO 20 NE  RMY N/A
01/14  38/31/35/+10/0.01/0.0/000/00          16 W   AERO 15 W   RMY N/A
01/15  48/35/42/+17/0.00/0.0/503/89          24 W   AERO 23 W   RMY 24
01/16  42/24/33/+8/0.06/T/142/25             54 W   AERO 52 W   RMY 59
01/17  24/10/17/-8/0.00/0.0/552/97           50 NW  AERO 48 NW  RMY N/A
01/18  28/8/18/-7/0.35/2.8/000/00            28 WSW AERO 24 ESE RMY N/A
01/19  40/21/31/+6/0.02/0.2/332/58           44 W   AERO 44 W   RMY 42
01/20  26/12/19/-6/0.00/0.0/442/77           33 NW  AERO 32 NW  RMY N/A
01/21  24/10/17/-8/0.00/0.0/472/82           22 NW  AERO 21 NW  RMY N/A
01/22  34/13/24/-1/0.00/0.0/566/98           16 SW  AERO 16 SW  RMY N/A
01/23  46/26/36/+11/0.00/0.0/348/60          21 SW  AERO 20 SW  RMY 19
01/24  44/31/38/+13/0.00/0.0/524/90          21 ENE AERO 17 ENE RMY N/A
01/25  50/36/43/+18/0.57/0.0/000/00         41 ESE AERO 41 ESE RMY 40
01/26  49/35/42/+17/0.00/0.0/346/59         33 W   AERO 31 W   RMY 32
01/27  43/33/38/+13/0.00/0.0/106/18         30 W   AERO 29 W   RMY 29
01/28  37/30/34/+9/T/T/030/05               25 NW  AERO 25 NW  RMY 27
01/29  38/23/31/+6/0.00/0.0/522/88          24 N   AERO 23 N   RMY 24
01/30  34/16/25/-1/0.00/0.0/547/92          17 NNW AERO 16 NNW RMY N/A
01/31  43/24/34/+8/0.00/0.0/430/72          22 S   AERO 21 S   RMY 22

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 TEMPERATURE FOR JANUARY,
MATCHES 68F SET ON 1/26/1950.

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01  38/30/34/+8/0.01/T/…./..          14 WSW AERO 14 WSW RMY N/A
02/02  40/30/35/+9/0.00/0.0/…./..        18 W   AERO 18 WNW RMY 18
02/03  44/27/36/+10/0.00/0.0/…./..       28 W   AERO 28 W   RMY 28
02/04  44/33/39/+13/0.00/0.0/…./..       19 E   AERO 16 E   RMY 18
02/05  41/30/36/+10/0.00/0.0/…./..       20 NNW AERO 19 NNW RMY N/A
02/06  31/30/34/+8/0.00/0.0/…./..        29 E   AERO 28 E   RMY 27
02/07  53/25/39/+12/…./0.1/…./..       71 WSW AERO 71 SSW RMY 73
02/08  33/20/27/0/T/T/…./..              46 W   AERO 44 W   RMY 44
02/09  33/15/24/-3/T/T/…./..             30 SSE AERO 29 SSE RMY N/A
02/10  42/33/38/+11/…./0.0/…./..       39 SSW AERO 39 SSW RMY 39

02/11 The low since midnight is 37F, daily normal minimum is 18F

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

RECORDS FOR FEBRUARY 11
HIGH 60F IN 1981
LOW -10F IN 1899
PRECIP 1.07 INCHES IN 1955
SNOWFALL 9.6 INCHES IN 1933
PEAK GUST 95 MPH S IN 1981

RECORDS FOR FEBRUARY 12
HIGH 56F IN 1999
LOW -14F IN 1914
PRECIP 4.85 INCHES IN 1886 [RECORD FOR MONTH] SNOWFALL 15.0 INCHES IN 2006
PEAK GUST 70 MPH E IN 1985

TODAY’S REPORT PREPARED BY: Matt Douglas