Sunday, May 31, 2020

| May 31, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 31, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A PARTLY CLOUDY DAY WITH A COOL NORTH WESTERLY
BREEZE….

We observed very little in the way of clouds,
with a visibility of 80 miles on average.
Meanwhile, the temperature stayed cool due to
a nice breeze from the northwest. The max gust
so far today is 30 mph, with a constant speed
around 20 mph. Conditions stayed rather dry,
with humidity dipping to 30% shortly after the
1 P.M. observation.

The high so far today is 67F, this is 4 degrees
below the daily normal high of 71F. The low since
midnight is 54F, which is 2 degrees above the daily
normal low of 52F.

Today’s Observations:

7 A.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 58F; Dew Point: 45F; Relative Humidity: 61%
Wind: NW at 7G20 kts
Sea-level pressure: 29.96 ins. Hg: rising steadily
Visibility: 75 miles,
6-hr Max temp: 61F
6-hr Min temp: 54F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 40 SCT 220 SCT 75 146/58/45/3207G20/996/
8/105 53023 10061 20054

10 A.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 61F; Dew Point: 40F; Relative Humidity: 45%
Wind: NNW at 8G21 kts, peak of 30 mph at 9:37 A.M.
Sea-level pressure: 29.99 ins. Hg: falling steadily
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 40 SCT 220 SCT 80 160/61/40/3308G21/999/ PK
WND 3226/37/ 8/105 51014

1 P.M.
Weather: Scattered cumulus
Temperature: 58F; Dew Point: 45F; Relative Humidity: 35%
Wind: NW at 14G22 kts
Sea-level pressure: 29.97 ins. Hg: falling steadily
Visibility: 75 miles
6-hr Max temp: 67F
6-hr Min temp: 54F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT 75 153/58/45/3214G22/097/ 8/100 58007
10067 20054

SUMMARY FOR SATURDAY, MAY 30, 2020

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..70
MIN…..63   NORMAL…..52
MEAN….71   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL……………..+10
TOTAL DEPARTURE FOR THE MONTH……………..-10 [-0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………..282  DEPARTURE…….+19
TOTAL HEATING UNITS FOR THE SEASON…………5803  DEPARTURE……-495
TOTAL HEATING UNITS LAST SEASON TO DATE…….6216  DEPARTURE……-413

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….6  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………32  DEPARTURE…….+11
TOTAL COOLING UNITS FOR THE SEASON…………..32  DEPARTURE……..+9
TOTAL COOLING UNITS LAST SEASON TO DATE……….8  DEPARTURE…….+24

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 S   AT 12:53 A.M.
AERO…………………….30 S   AT 12:57 A.M.
ASOS…………………….31 S   AT 12:53 A.M.
DAVIS……………………30 S   AT 12:53 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….24 S   AT 12:56 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 S   AT 12:54 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 S   AT 12:54 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.8 W
ASOS…………………….13.2
DAVIS……………………12.8 WSW [252 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.75  DEPARTURE……-1.21
ASOS…………..2.71
TOTAL PRECIPITATION FOR THE YEAR……….19.79  DEPARTURE……-2.72
ASOS………….20.31

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  66/46/56/-4/0.00/0.0/…/..         18 ENE  AERO 18 ENE RMY N/A
05/26  82/56/69/+9/0.00/0.0/…/..         21 S    AERO 21 S   RMY 21
05/27  84/59/72/+12/0.00/0.0/…/..        31 SSW  AERO 31 SSW RMY 31
05/28  77/63/70/+9/…/0.0/…/..          33 SSW  AERO 33 S   RMY 33
05/29  78/66/72/+11/…./…/…/..        41 SSW  AERO 41 SSW RMY 43
05/30  79/63/71/+10/…./…/…/..        30 S    AERO 30 S   RMY N/A

05/31 The low since midnight is 54F, the daily normal low is 52F

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 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945

RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month]
PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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