Wednesday, May 20, 2020

| May 21, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 20, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH A LIGHT, COOL
NORTHEASTERLY BREEZE….

Today was partly cloudy, with 80 miles of visibility
on average. Wind was light and easterly, with a max
gust of only 17 mph. Pressure has been on a steady
decline as well as the humidity, which reached 29%
by the 1 P.M. observation.

The high so far today is 62F, this is 5 degrees below the
daily normal high of 67F. The low since midnight is 43F,
which is 6 degrees below the daily normal low of 49F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 51F; Dew Point: 35F; Relative Humidity: 53%
Wind: ENE at 7 kts
Sea-level pressure: 30.50 ins. Hg: steady, then rising
Visibility: 80 miles
6-hr Max temp: 51F
6-hr Min temp: 43F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 250 SCT 80 327/51/35/0707/050/ 8/002 52020
10051 20043

10 A.M.
Weather: Scattered cirrus
Temperature: 59F; Dew Point: 32F; Relative Humidity: 36%
Wind: ENE at 5 kts, light
Sea-level pressure: 30.47 ins. Hg: rising, then more slowly
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 250 SCT 80 335/59/32/0705/047/ WND LGT/ 8/002 50008

1 P.M.
Weather: Clear, few cirrus
Temperature: 60F; Dew Point: 28F; Relative Humidity: 29%
Wind: ESE at 7 kts
Sea-level pressure: 30.46 ins. Hg: rising then falling
Visibility: 75 miles
6-hr Max temp: 62F
6-hr Min temp: 51F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 CLR 75 331/60/28/1107/046/ FEW CI ALQDS/ 8/002
58004 10062 20051

SUMMARY FOR TUESDAY, MAY 19, 2020

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..67
MIN…..44   NORMAL…..48
MEAN….51   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL……………….-7
TOTAL DEPARTURE FOR THE MONTH………………-48 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE MONTH…………..232  DEPARTURE…….+39
TOTAL HEATING UNITS FOR THE SEASON…………5753  DEPARTURE……-475
TOTAL HEATING UNITS LAST SEASON TO DATE…….6149  DEPARTURE……-396

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE SEASON……………2  DEPARTURE……..-8
TOTAL COOLING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+2

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 ENE AT 7:45 A.M.
AERO…………………….34 ENE AT 7:34 A.M.
ASOS…………………….35 ENE AT 7:45 A.M.
DAVIS……………………34 ENE AT 7:45 A.M. RMY 32
FASTEST MILE FOR YESTERDAY………………….23 ENE AT 7:46 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 ENE AT 7:46 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 ENE AT 7:46 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.0 NE
ASOS…………………….11.8
DAVIS……………………12.4 ENE [068 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.55  DEPARTURE……+0.20
ASOS…………..2.54
TOTAL PRECIPITATION FOR THE YEAR……….19.59  DEPARTURE……-1.31
ASOS………….20.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE SEASON…………..31.9  DEPARTURE……-30.8

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

05/01  64/52/58/+5/…./0.0/000/00         46 SSE  AERO 44 SSE RMY N/A
05/02  70/42/56/+3/…./0.0/729/86         41 NW   AERO 40 NW  RMY N/A
05/03  78/55/67/+14/0.00/0.0/613/72        35 SSW  AERO 35 SSW RMY 36
05/04  72/45/59/+5/T/0.0/247/29            37 NW   AERO 40 WNW RMY 39
05/05  60/40/50/-4/0.00/0.0/821/96         31 NW   AERO 32 NW  RMY N/A
05/06  57/38/48/-6/T/0.0/498/58            24 ESE  AERO 22 ENE RMY 22
05/07  63/37/50/-5/0.00/0.0/576/67         30 WSW  AERO 29 WSW RMY N/A
05/08  57/40/49/-6/…./0.0/328/38         31 W    AERO 32 W   RMY N/A
05/09  44/32/38/-17/…./T/484/56          52 W    AERO 53 W   RMY 54
05/10  59/31/45/-10/0.00/0.0/763/88        46 W    AERO 46 W   RMY 49
05/11  65/43/54/-2/0.22/0.0/…/..         39 S    AERO 43 S   RMY 41
05/12  55/37/46/-10/0.00/0.0/…/..        37 W    AERO 37 W   RMY 37
05/13  59/32/46/-10/0.00/0.0/…/..        37 WNW  AERO 37 WNW RMY 38
05/14  70/40/55/-2/0.00/0.0/…/..         29 W    AERO 26 W   RMY 27
05/15  78/50/64/+7/…./0.0/…/..         40 WSW  AERO 40 WSW RMY 43
05/16  69/47/58/+1/…./0.0/…/..         31 NW   AERO 31 NW  RMY 32
05/17  67/47/57/0/0.00/0.0/…/..          22 SSW  AERO N/A    RMY 21
05/18  60/47/54/-4/T/0.0/…/..            24 W    AERO 22 ENE RMY N/A
05/19  56/45/51/-7/0.00/0.0/…/..         35 ENE  AERO 34 ENE RMY 32

05/20 The low since midnight is 43F, the daily normal low is 49F

DAILY RECORDS FOR MAY 2020

5/13/2020: NEW RECORD LOW OF 32F, REPLACING 35F SET IN
1914 AND 2005

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

RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

RECORDS FOR MAY 21
HIGH 92F IN 1921
LOW 35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 74 MPH WSW IN 2006

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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