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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, FEBRUARY 21, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR, ABUNDANT SUNSHINE AND EXCELLENT VISIBILITY 
ATOP GREAT BLUE HILL...

Clear bluebird skies dominated our region today. This was
accompanied by excellent visibility remaining at a
consistent 85 miles. A snow-capped Mount Monadnock
in southwestern New Hampshire was seen throughout 
observations! Winds have been much gentler than
yesterday with only a 24 MPH gust earlier in the day- in
fact, winds were calm by 1PM. Below normal temperatures
have persisted into today with ocean effect snow showers
noted to our far southeast. 

The high so far today is 26F degrees, this is 12 degrees
below the normal of 38F. The low since midnight is 11F, 
9 degrees below the normal daily minimum of 20F.


Today's Observations:

7 A.M.
Weather: Clear, few cumulus offshore, virga distant SE
Temperature: 11F; Dew Point: -2F; Wind: NNW at 9G19 kts,
Relative Humidity: 53%
Sea-level pressure: 30.43 ins. Hg: falling, then rising
Visibility: 86 miles
6-hr Max temp: 17F
6-hr Min temp: 11F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 85 306/11/-2/3409G19/043/
FEW CU OFFSHR VIRGA DSNT SE/ 8/200 53005 10017 20011

10 A.M.
Weather: Clear, few cumulus offshore, virga distant SE
Temperature: 20F; Dew Point: 0F; Wind: NNW at 8 kts,
Relative Humidity: 42%
Sea-level pressure: 30.47 ins. Hg: rising, then rising more slowly
Visibility: 85 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 85 319/20/0/3408/047/ FEW CU OFFSHR VIRGA DSNT SE/ 8/200 51013

1 P.M.
Weather: Clear, few cumulus offshore, virga distant SE
Temperature: 26F; Dew Point: -1F; Wind: Calm
Relative Humidity: 31%
Sea-level pressure: 30.42 ins. Hg: steady, then decreasing
Visibility: 85 miles
6-hr Max temp: 26F
6-hr Min temp: 11F
6-hr Precip:  0.00 ins. 
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 85 302/26/-1/0000/042/
FEW CU OFFSHR VIRGA DSNT SE WND CALM/
8/200 52017 10026 20011

SUMMARY FOR THURSDAY, FEBRUARY 20, 2020 

TEMPERATURE (DEGREES F)
MAX.....31   NORMAL.....38
MIN.....18   NORMAL.....20
MEAN....25   NORMAL.....29

DEPARTURE FROM 30-YEAR NORMAL....................-4
TOTAL DEPARTURE FOR THE MONTH...................+101 [+4.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............40  DEPARTURE....... +4
TOTAL HEATING UNITS FOR THE MONTH..............654  DEPARTURE......-103
TOTAL HEATING UNITS FOR THE SEASON............3883  DEPARTURE......-404
TOTAL HEATING UNITS LAST SEASON TO DATE.......4194  DEPARTURE......-311

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................32 W   AT 12:47 A.M.  
                   AERO.........................32 W   AT 12:44 A.M.   
                   ASOS.........................32 WNW AT 12:42 A.M. 
                   DAVIS........................34 W   AT 12:42 A.M. RMY n/a
FASTEST MILE FOR YESTERDAY......................24 W   AT 12:45 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE...................22 W   AT 12:44 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................24 W   AT 12:43 A.M.
AVERAGE WIND SPEED AND DIRECTION.............10.4 WNW                
                   ASOS......................9.9
                   DAVIS.....................10.9 WNW [293 deg.]


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.20  DEPARTURE......-0.61
                         ASOS..............2.30
TOTAL PRECIPITATION FOR THE YEAR...........3.66  DEPARTURE......-3.50
                         ASOS..............3.84

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5
TOTAL SNOWFALL FOR THE MONTH................0.6  DEPARTURE.......-9.3
TOTAL SNOWFALL FOR THE SEASON..............24.8  DEPARTURE......-18.2


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  41/30/36/+9/0.00/0.0/..../..        37 W   AERO 36 W   RMY N/A
02/13  35/31/34/+6/.00/0.0/..../..         29 SSW AERO 29 SSW RMY N/A
02/14  33/8/21/-7/0.00/0.0/..../..         32 WNW AERO 32 NW  RMY 34
02/15  27/4/16/-12/0.00/0.0/..../..        31 SSW AERO 31 SSW RMY N/A
02/16  40/23/32/+4/0.00/0.0/..../..        38 SW  AERO 38 SW  RMY N/A
02/17  44/28/36/+8/0.00/0.0/..../..        25 WNW AERO 24 WNW RMY 24
02/18  37/27/32/+3/0.31/T/..../..          26 SE  AERO 26 SE  RMY N/A
02/19  42/25/34/+5/0.00/0.0/.../..         45 W   AERO 46 W   RMY 44
02/20  31/18/25/-4/0.00/0.0/.../..         32 W   AERO 32 W   RMY N/A

02/21 The low since midnight is 11F, daily normal minimum is 20F 


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

RECORDS FOR FEBRUARY 21
HIGH 70F IN 2018
LOW -6F IN 1950
PRECIP 2.42 INCHES IN 1898
SNOWFALL 9.0 INCHES IN 1929
PEAK GUST 72 MPH WNW IN 1967

RECORDS FOR FEBRUARY 22
HIGH 63F IN 1997
LOW -1F IN 1918
PRECIP 1.38 INCHES IN 1900
SNOWFALL 8.0 INCHES IN 1893
PEAK GUST 74 MPH S IN 1974

TODAY'S REPORT PREPARED BY: Andrew Swanson