Friday, May 29, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 29, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS, HUMIDITY, HAZE DOMINATE ANOTHER DAY…

Today has been a close mirror to yesterday.
Overnight precipitation amounted to a measly
0.03 inches bringing the 24-hour total to 0.04.
This continues a below average May at -1.03 inches
for the month, and -2.54 inches for the year. We
truly need a decent rain event to chip away at this
deficit and to also bring down the pollen count.
With high pollen levels combined with dew points
in the upper-60s, visibility continues to take a
hit – 35 miles at best today. Skies remained mostly
cloudy throughout the day with some minor splashes of
sun and here, but they were far and few. Winds
have notably increased this afternoon topping
out so far at 37 MPH as a cold front approaches!

The high so far today is 76F, this is 6 degrees
above the daily normal high of 70F. The low since
midnight is 66F, which is 14 degrees above the daily
normal low of 52F.

Today’s Observations:

7 A.M.
Weather: Overcast Stratus Fractus
Temperature: 68F; Dew Point: 67F; Relative Humidity: 96%
Wind: SSW at 14 kts
Sea-level pressure: 30.06 ins. Hg: falling steadily
Visibility: 30 miles, hazy
6-hr Max temp: 68F
6-hr Min temp: 66F
24-hr Precip:  0.04 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E10 OVC 30 178/68/67/2014/006/ HAZY/ 8/7// 57003
70004 10068 20066

10 A.M.
Weather: Broken Stratus Fractus; Broken Cirrocumulus
Temperature: 74F; Dew Point: 68F; Relative Humidity: 83%
Wind: SSW at 15G25 kts
Sea-level pressure: 30.03 ins. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E10 BKN E230 BKN 35 170/74/68/2115G25/003/ HAZY/
8/709 58008

1 P.M.
Weather: Broken Stratocumulus
Temperature: 76F; Dew Point: 67F; Relative Humidity: 74%
Wind: SSW at 15G26 kts
Sea-level pressure: 29.99 ins. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 68F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E20 BKN 30 155/76/67/2115G26/999/ HAZY/ 8/400
58015 10076 20068

SUMMARY FOR THURSDAY, MAY 28, 2020

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..70
MIN…..63   NORMAL…..51
MEAN….70   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL………………+9
TOTAL DEPARTURE FOR THE MONTH……………..-31 [-1.3 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…….+30
TOTAL HEATING UNITS FOR THE SEASON…………5803  DEPARTURE……-484
TOTAL HEATING UNITS LAST SEASON TO DATE…….6189  DEPARTURE……-386

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………….5  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH……………19  DEPARTURE………1
TOTAL COOLING UNITS FOR THE SEASON…………..19  DEPARTURE……..-1
TOTAL COOLING UNITS LAST SEASON TO DATE……….8  DEPARTURE……..11

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 SSW AT  8:34 P.M.
AERO…………………….33 S   AT 11:48 P.M.
ASOS…………………….33 SSW AT  8:35 P.M.
DAVIS……………………33 SSW AT  8:34 P.M. RMY 33
FASTEST MILE FOR YESTERDAY………………….24 SSW AT 10:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S   AT 10:27 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 SSW AT  8:36 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….14.1 SSW
ASOS…………………….14.4
DAVIS……………………13.2 SSW [209 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.10
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE MONTH……….2.63  DEPARTURE……-1.03
ASOS…………..2.59
TOTAL PRECIPITATION FOR THE YEAR……….19.67  DEPARTURE……-2.54
ASOS………….20.19

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 The low since midnight is 66F, 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 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Andrew Swanson