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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, FEBRUARY 12, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ABUNDANT SUNSHINE DESPITE A GOOD AMOUNT OF 
UPPER-LEVEL CLOUD COVER....

Visibility today is great compared to yesterday, with 
a perfect visibility of 90 miles being seen at the 
10 A.M. observation. Cloud cover has consisted of 
either fair weather cumulus or cirrostratus, which 
covered most of the sky by 1 P.M. Yesterday's rainfall
totaled 0.21 inches, measured at 7 A.M. Conditions are
drying slightly, reaching 42% relative humidity by 
noontime.

Wind has been around 15 mph for most of the day, advecting
a good amount of cold air from the west. Clouds moved in 
fast since this morning, signifying strong upper level
winds. The high so far today is 41F, 5 degrees above the normal
high of 36F. The low since midnight is 30F, 11 degrees 
above the normal low of 19F.


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: Scattered cumulus and stratocumulus
Temperature: 32F; Dew Point: 22F; Wind: WNW at 12G19 kts
Sea-level pressure: 30.04 ins. Hg: rising rapidly
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 30F
24-hr Precip:  0.21 ins.
24-hr Snowfall: 0.0 ins. 
BHO SA 1155 E40 SCT 70 174/32/22/2912G20/004/ 8/800 70021 
53047 10035 20030

10 A.M.
Weather: Broken cirrostratus, few cumulus SW-NE,
smoke plume to the WNW
Temperature: 34F; Dew Point: 23F; Wind: WNW at 13G19 kts
Sea-level pressure: 30.15 ins. Hg: falling then rising
Visibility: 90 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E250 BKN 90 211/34/23/2913G19/015/ FEW CU SW-NE K PLUME 
WSW/ 8/108 51037

1 P.M.
Weather: Broken cirrostratus
Temperature: 39F; Dew Point: 18F; Wind: W at 9G14 kts
Sea-level pressure: 30.13 ins. Hg: falling slowly 
Visibility: 80 miles
6-hr Max temp: 41F
6-hr Min temp: 32F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E250 BKN 80 206/39/18/2809G14/013/ 8/008 58005 10041 
20032


SUMMARY FOR TUESDAY, FEBRUARY 11, 2020 

TEMPERATURE (DEGREES F)
MAX.....40   NORMAL.....36
MIN.....36   NORMAL.....18
MEAN....38   NORMAL.....27

DEPARTURE FROM 30-YEAR NORMAL...................+11
TOTAL DEPARTURE FOR THE MONTH...................+89 [+7.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............27  DEPARTURE.......-11
TOTAL HEATING UNITS FOR THE MONTH..............335  DEPARTURE.......-90
TOTAL HEATING UNITS FOR THE SEASON............3564  DEPARTURE......-392
TOTAL HEATING UNITS LAST SEASON TO DATE.......3862  DEPARTURE......-298

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 W   AT 11:48 P.M.  
                   AERO.........................23 W   AT 11:32 P.M.   
                   ASOS.........................23 W   AT 11:50 P.M. 
                   DAVIS........................24 WNW AT 11:14 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................17 W   AT 11:58 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................17 W   AT 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................18 W   AT 11:32 P.M.
AVERAGE WIND SPEED AND DIRECTION...............5.8 ENE                
                   ASOS........................5.8
                   DAVIS.......................6.1 NNW [336 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.21  DEPARTURE......+0.07
                         ASOS..............0.24
TOTAL PRECIPITATION FOR THE MONTH..........1.31  DEPARTURE......-0.18
                         ASOS..............1.41
TOTAL PRECIPITATION FOR THE YEAR...........2.77  DEPARTURE......-3.07
                         ASOS..............2.95

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.......-5.3
TOTAL SNOWFALL FOR THE SEASON..............24.3  DEPARTURE......-14.2


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  40/36/38/+11/..../0.0/.../..        24 W   AERO 23 W   RMY N/A

02/12 The low since midnight is 30F, daily normal minimum is 19F 


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

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

RECORDS FOR FEBRUARY 13
HIGH 64F IN 1951
LOW -10F IN 1967
PRECIP 2.80 INCHES IN 2008
SNOWFALL 13.5 INCHES IN 1894
PEAK GUST 60 MPH SE IN 1972

TODAY'S REPORT PREPARED BY: Benjamin Turner and Greg White