Thursday, May 28, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 28, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH A VERY LIGHT DRIZZLE, YET STILL
WARM….

Fog kept visibility down to 1/2 miles at the
7 A.M. observation, but decreased as the day
went on. Most of the day we observed a light
drizzle, only amounting to 0.01 inches by 1 P.M.
Despite the overcast, a southwesterly wind
around 20 mph keeps us warmer than seasonal
averages.

The high so far today is 74F, this is 4 degrees
above the daily normal high of 70F. The low since
midnight is 63F, which is 12 degrees above the daily
normal low of 51F.

Today’s Observations:

7 A.M.
Weather: Overcast stratus, drizzle
Temperature: 67F; Dew Point: 67F; Relative Humidity: 100%
Wind: SW at 7 kts
Sea-level pressure: 30.23 ins. Hg: rising, then more slowly
Visibility: 1/2 miles, fog
6-hr Max temp: 67F
6-hr Min temp: 63F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E10 OVC 1/2LF 238/67/67/2207/023/ LCTD/ 8/6//
53007 10067 20063

10 A.M.
Weather: Overcast stratus
Temperature: 70F; Dew Point: 66F; Relative Humidity: 86%
Wind: SW at 10 kts
Sea-level pressure: 30.22 ins. Hg: falling steadily
Visibility: 15 miles, thin fog
3-hr Precip:  Trace
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E20 OVC 15 233/70/66/2210/022/ THN FG ALQDS/
8/6// 600// 58005

1 P.M.
Weather: Overcast stratus, very light drizzle
Temperature: 74F; Dew Point: 66F; Relative Humidity: 77%
Wind: SSW at 12G22 kts
Sea-level pressure: 30.19 ins. Hg: falling steadily
Visibility: 15 miles, thin fog
6-hr Max temp: 76F
6-hr Min temp: 67F
6-hr Precip:  0.01 ins.
6-hr Snowfall: 0.0 ins.
6-hr Max temp: 76F
6-hr Min temp: 67F
BHO SA 1755 E30 OVC 15 223/74/66/2012G22/019/ THN FG ALQDS
L-CTD PCPN VRY LGT/ 8/6// 6001/ 58010 10076 20067

SUMMARY FOR WEDNESDAY, MAY 27, 2020

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..69
MIN…..59   NORMAL…..51
MEAN….72   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL………………+12
TOTAL DEPARTURE FOR THE MONTH………………-40 [-1.7 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…….+36
TOTAL HEATING UNITS FOR THE SEASON…………5803  DEPARTURE……-478
TOTAL HEATING UNITS LAST SEASON TO DATE…….6177  DEPARTURE……-374

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….7  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH……………14  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON…………..14  DEPARTURE……..-5
TOTAL COOLING UNITS LAST SEASON TO DATE……….8  DEPARTURE……..+6

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..31 SSW AT  6:17 P.M.
AERO…………………….31 SSW AT  6:20 P.M.
ASOS…………………….31 SSW AT  6:19 P.M.
DAVIS……………………31 SSW AT  6:12 P.M. RMY 31
FASTEST MILE FOR YESTERDAY………………….22 SSW AT  6:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S   AT  6:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 SSW AT  6:20 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.5 SSW
ASOS…………………….13.0
DAVIS……………………11.8 SSW [205 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……-0.92
ASOS…………..2.56
TOTAL PRECIPITATION FOR THE YEAR……….19.63  DEPARTURE……-2.43
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  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 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 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner