Wednesday, May 27, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

SUMMER-LIKE WITH DECENT VISIBILITY AND
MOSTLY CLOUDLESS SKIES….

Some low clouds and fog dissipated quickly this
morning, giving blue hill a day very consistent
with its usual summer conditions. Skies were
mostly clear this morning, with a cirrostratus
layer building along the horizon in conjunction
with a slight and steady fall in pressure. Winds
have remained southerly, bringing a good amount
of warm air into the region. Visibility is 65 miles
on average, due to a slight haze in the distance.

Temperatures today are consistent with normal temps
in early July! The high so far today is 83F, this is
14 degrees above the daily normal high of 69F. The low
since midnight is 59F, which is 8 degrees above the daily
normal low of 51F.

Today’s Observations:

7 A.M.
Weather: Clear, few stratus fractus
Temperature: 64F; Dew Point: 60F; Relative Humidity: 87%
Wind: SW at 7 kts
Sea-level pressure: 30.24 ins. Hg: rising, then more slowly
Visibility: 65 miles
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 CLR 65 241/64/60/2207/024/ FEW STFA ALQDS/ 8/700
53008 10064 20059

10 A.M.
Weather: Clear, few cirrostratus
Temperature: 76F; Dew Point: 60F; Relative Humidity: 58%
Wind: S at 11 kts
Sea-level pressure: 30.24 ins. Hg: falling steadily
Visibility: 65 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 65 240/76/60/1811/024/ FEW CS ALQDS/ 8/005 58001

1 P.M.
Weather: Scattered cirrostratus, few distant cumulus offshore
Temperature: 82F; Dew Point: 62F; Relative Humidity: 51%
Wind: S at 12G18 kts
Sea-level pressure: 30.21 ins. Hg: falling steadily
Visibility: 70 miles
6-hr Max temp: 83F
6-hr Min temp: 64F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 250 SCT 70 015/82/62/1812G18/021/ FEW DSNT CU OFFSHR/
8/105 58009 10083 20064

SUMMARY FOR TUESDAY, MAY 26, 2020

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..69
MIN…..56   NORMAL…..51
MEAN….69   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL……………… +9
TOTAL DEPARTURE FOR THE MONTH………………-52 [-2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………..282  DEPARTURE…….+41
TOTAL HEATING UNITS FOR THE SEASON…………5803  DEPARTURE……-472
TOTAL HEATING UNITS LAST SEASON TO DATE…….6177  DEPARTURE……-374

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….4  DEPARTURE……..+3
TOTAL COOLING UNITS FOR THE MONTH…………….7  DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE SEASON……………7  DEPARTURE…….-10
TOTAL COOLING UNITS LAST SEASON TO DATE……….6  DEPARTURE……..+1

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 S   AT  7:31 P.M.
AERO…………………….21 S   AT  7:24 P.M.
ASOS…………………….22 S   AT  7:17 P.M.
DAVIS……………………22 S   AT  7:17 P.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….14 S   AT  7:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 S   AT  7:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 S   AT  7:07 P.M.
AVERAGE WIND SPEED AND DIRECTION……………. 5.8 E
ASOS……………………. 5.9
DAVIS…………………… 5.9 S [188 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……….2.59  DEPARTURE……-0.77
ASOS…………..2.56
TOTAL PRECIPITATION FOR THE YEAR……….19.63  DEPARTURE……-2.28
ASOS………….20.16

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/-2/0.22/0.0/322/37         39 S    AERO 43 S   RMY 41
05/12  55/37/46/-10/0.00/0.0/801/92        37 W    AERO 37 W   RMY 37
05/13  59/32/46/-10/0.00/0.0/864/99        37 WNW  AERO 37 WNW RMY 38
05/14  70/40/55/-2/0.00/0.0/831/95         29 W    AERO 26 W   RMY 27
05/15  78/50/64/+7/…./0.0/535/61         40 WSW  AERO 40 WSW RMY 43
05/16  69/47/58/+1/…./0.0/730/83         31 NW   AERO 31 NW  RMY 32
05/17  67/47/57/0/0.00/0.0/132/15          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  63/43/53/-5/0.00/0.0/…/..         22 ESE  AERO 20 SE  RMY 19
05/21  76/42/59/0/0.00/0.0/…/..          26 S    AERO 25 S   RMY 25
05/22  82/50/66/+7/0.00/0.0/…/..         29 W    AERO 29 W   RMY 28
05/23  67/44/56/-3/0.02/0.0/…/..         42 ENE  AERO 43 ENE RMY 40
05/24  58/43/51/-8/T/0.0/…/..            27 ENE  AERO 24 ENE RMY N/A
05/25  82/56/69/+9/0.00/0.0/…/..         21 S    AERO 21 S   RMY 21

05/26 The low since midnight is 59F, the daily normal low is 51F

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 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

TODAY’S REPORT PREPARED BY: Benjamin Turner