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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, FEBRUARY 9, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

VERY LIGHT WIND WITH OVERCAST AFTERNOON SKIES,
INCLUDING SOME FLURRIES....

We observed light winds today, being calm at the 10 A.M. observation.
As the day went on clouds began to fill the sky, and it began to snow
very lightly right before 1 P.M. Ponkapoag and Houghton's Pond have 
begun to freeze over after being completely thawed yesterday, 
continuing to show little to no certainty whether it is spring or 
winter at this point. 
   
The high so far today is 31F, 4 degrees below the normal high
of 35F. The low since midnight is 15F, 3 degrees below 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: N/A 

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 stratocumulus, scattered
altostratus
Temperature: 16F; Dew Point: 7F; Wind: NNE at 5 kts,
Wind: Light
Sea-level pressure: 30.55 ins. Hg: rising steadily
Visibility: 65 miles
6-hr Max temp: 19F
6-hr Min temp: 15F
24-hr Precip:   Trace
24-hr Snowfall: Trace 
BHO SA 1155 50 SCT 100 SCT 65 344/16/7/0305/055/ NEW 
SNOW PAST 24 HOURS TRACE WND LGT/ 8/570 51022 10019 20015

10 A.M.
Weather: Scattered altostratus
Temperature: 25F; Dew Point: 12F; Wind: Calm
Sea-level pressure: 30.59 ins. Hg: falling then rising
Visibility: 65 miles
3-hr Precip:   0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 100 SCT 65 360/25/12/0000/059/ WND CALM/ 
8/070 51016 

1 P.M.
Weather: Broken altostratus, light snow beginning
5 minutes before the hour
Temperature: 31F; Dew Point: 17F; Wind: S at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.58 ins. Hg: rising then falling 
Visibility: 30 miles
6-hr Max temp: 31F
6-hr Min temp: 16F
6-hr Precip:   Trace
6-hr Snowfall: Trace
BHO SA 1755 E60 OVC 30 358/31/17/1704/058/ NEW SNOW PAST 
3 HOURS TRACE S-B55 WND L/V/ 8/070 58002 10031 20016


SUMMARY FOR SATURDAY, FEBRUARY 8, 2020 

TEMPERATURE (DEGREES F)
MAX.....33   NORMAL.....35
MIN.....20   NORMAL.....18
MEAN....27   NORMAL.....27

DEPARTURE FROM 30-YEAR NORMAL....................+0
TOTAL DEPARTURE FOR THE MONTH...................+70 [+8.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............38  DEPARTURE.........0
TOTAL HEATING UNITS FOR THE MONTH..............240  DEPARTURE.......-71
TOTAL HEATING UNITS FOR THE SEASON............3469  DEPARTURE......-373
TOTAL HEATING UNITS LAST SEASON TO DATE.......3747  DEPARTURE......-278

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................46 W   AT 11:44 A.M.  
                   AERO.........................44 W   AT 11:59 A.M.   
                   ASOS.........................46 W   AT 11:45 A.M. 
                   DAVIS........................47 W   AT 11:44 A.M. RMY 44
FASTEST MILE FOR YESTERDAY......................35 W   AT 11:44 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................32 W   AT 11:58 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................34 W   AT 11:57 A.M.
AVERAGE WIND SPEED AND DIRECTION..............17.4 W                
                   ASOS.......................15.9
                   DAVIS......................17.9 WNW [283 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace  DEPARTURE......-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.94  DEPARTURE......-0.14
                         ASOS..............0.96
TOTAL PRECIPITATION FOR THE YEAR...........2.40  DEPARTURE......-3.03
                         ASOS..............2.50

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.4
TOTAL SNOWFALL FOR THE MONTH................0.1  DEPARTURE.......-3.8
TOTAL SNOWFALL FOR THE SEASON..............24.3  DEPARTURE......-12.7


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 The low since midnight is 15F, 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 9
HIGH 58F IN 1990
LOW -21F IN 1934 [LOWEST TEMPERATURE ON RECORD]
PRECIP 2.12 INS. IN 1969
SNOWFALL 16.9 INS. IN 2016
PEAK GUST 89 MPH NE IN 1969

RECORDS FOR FEBRUARY 10
HIGH 56F IN 1909
LOW -8F IN 1899
PRECIP 1.34 INS. IN 1909
SNOWFALL 12.1 INS. IN 1926
PEAK GUST 64 MPH W IN 2001

TODAY'S REPORT PREPARED BY: Benjamin Turner