Thursday, February 20, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 20, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

INCREASING CLOUDS WITH EXCELLENT VISIBILITY
AND DRY CONDITIONS….

The partly cloudy skies of this morning began to fill
in around noontime, consisting of fair weather cumulus
and a cirrostratus layer. Winds are light and westerly,
with an average speed not exceeding 10 mph. However,
there was a gust of wind around 25 mph between 10 A.M. and
11 A.M. Visibility was excellent yet again, it being
85 miles for the majority of the day.

The high so far today is 31F degrees, this is 7 degrees
below the normal of 38F. The low since midnight is 18F,
2 degrees below the normal daily minimum of 20F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few cumulus offshore
Temperature: 18F; Dew Point: 10F; Wind: NW at 5 kts,
Wind: Light
Relative Humidity: 70%
Sea-level pressure: 30.41 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 24F
6-hr Min temp: 18F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 250 SCT 80 299/18/10/3105/041/ FEW CU OFFSHR
WND LGT/ 8/105 52021 10024 20018

10 A.M.
Weather: Scattered cumulus, scattered cirrostratus
Temperature: 27F; Dew Point: 6F; Wind: NW at 5 kts,
Wind: Light
Relative Humidity: 41%
Sea-level pressure: 30.43 ins. Hg: falling then rising
Visibility: 85 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 40 SCT 250 SCT 85 306/27/6/3105/043/ WND LGT/
8/105 50007

1 P.M.
Weather: Scattered cumulus, broken cirrostratus
Temperature: 31F; Dew Point: 9F; Wind: W at 10G23 kts
Relative Humidity: 40%
Sea-level pressure: 30.35 ins. Hg: steady
Visibility: 80 miles
6-hr Max temp: 31F
6-hr Min temp: 18F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT E250 BKN 80 281/31/9/2710G23/035/
8/108 58025 10031 20018

SUMMARY FOR WEDNESDAY, FEBRUARY 19, 2020

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..37
MIN…..25   NORMAL…..20
MEAN….34   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL………………. +5
TOTAL DEPARTURE FOR THE MONTH……………….+105 [+5.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………31  DEPARTURE……. -5
TOTAL HEATING UNITS FOR THE MONTH…………..614  DEPARTURE……-107
TOTAL HEATING UNITS FOR THE SEASON…………3843  DEPARTURE……-408
TOTAL HEATING UNITS LAST SEASON TO DATE…….4148  DEPARTURE……-305

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..45 W   AT 12:12 P.M.
AERO…………………….46 W   AT 12:14 P.M.
ASOS…………………….45 W   AT 12:13 P.M.
DAVIS……………………46 W   AT 12:12 P.M. RMY 44
FASTEST MILE FOR YESTERDAY………………….34 W   AT 12:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….32 W   AT 12:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………35 W   AT 12:44 P.M.
AVERAGE WIND SPEED AND DIRECTION………….16.6 W
ASOS………………….16.3
DAVIS…………………16.9 WNW [287 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……-0.46
ASOS…………..2.30
TOTAL PRECIPITATION FOR THE YEAR………..3.66  DEPARTURE……-3.35
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…….-8.8
TOTAL SNOWFALL FOR THE SEASON…………..24.8  DEPARTURE……-17.7

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 The low since midnight is 18F, 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 20
HIGH 68F IN 2018
LOW -4F IN 1966
PRECIP 1.90 INCHES IN 1934
SNOWFALL 15.0 INCHES IN 1921,1934
PEAK GUST 78 MPH NW IN 1972

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

TODAY’S REPORT PREPARED BY: Benjamin Turner and Ann Murphy