Wednesday, May 29, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 29, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY WITH LIGHT WIND AND IMPROVING
VISIBILITY IN THE AFTERNOON….

Due to dissipating fog, visibility increased from
5 miles this morning to an excellent 80 miles by
the 1 P.M. observation. Rain yesterday afternoon
left 0.31 inches in the gauge, measured at 7 A.M.
Wind has remained light, shifting from north to
east throughout the day. The high so far today
is 50F, 20 degrees below the daily normal maximum
of 70F. The low since midnight is 45F, 7 degrees
below the normal minimum of 52F.

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 46F; Dew Point: 46F; Wind: N at 7 kts
Sea-level pressure: 29.79 ins. Hg, rising steadily
Visibility: 5 miles, fog
6-hr Max temp: 48F
6-hr Min temp: 45F
24-hr Precip: 0.31 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E10 OVC 5F 089/46/46/3607/979/ 8/6//
70031 53022 10048 20045

10 A.M.
Weather: Overcast stratus
Temperature: 48F; Dew Point: 46F; Wind: N at 4 kts,
Wind: Light
Sea-level pressure: 29.80 ins. Hg, rising steadily
Visibility: 35 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E10 OVC 35 091/48/46/0104/980/ WND
LGT/ 8/6// 51002

1 P.M.
Weather: Broken stratus
Temperature: 50F; Dew Point: 46F; Wind: ENE at 3 kts,
Wind: Light and variable
Sea-level pressure: 29.82 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 50F
6-hr Min temp: 45F
6-hr Precip: 0.00 ins.
BHO SA 1755 E15 BKN 80 097/50/46/0703/982/ WND L/V/ 8/6//
51006 10050 20045

SUMMARY FOR TUESDAY, MAY 28, 2019

TEMPERATURE (DEGREES F)
MAX…..57   NORMAL…..70
MIN…..48   NORMAL…..51
MEAN….53   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL……………………-8
TOTAL DEPARTURE FOR THE MONTH…………………..-49 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH………….289   DEPARTURE……..+37
TOTAL HEATING UNITS FOR THE SEASON………..6190   DEPARTURE……..-97
TOTAL HEATING UNITS LAST SEASON TO DATE……5847   DIFFERENCE……+343

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH……………8   DEPARTURE……..-10
TOTAL COOLING UNITS FOR THE SEASON…………..8   DEPARTURE……..-12
TOTAL COOLING UNITS LAST SEASON TO DATE……..52   DEPARTURE……..-44

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 E    AT  1:13 P.M.
AERO…………………….22 ESE  AT 10:38 A.M.
ASOS…………………….26 E    AT  1:11 P.M.
DAVIS……………………26 E    AT  1:10 P.M.  RMY 25
FASTEST MILE FOR YESTERDAY………………….22 E    AT  1:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 E    AT  1:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 E    AT  1:08 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.5 E
ASOS……………………10.4
DAVIS…………………..10.9 E [83 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.31  DEPARTURE…….+0.16
ASOS…………..0.29
TOTAL PRECIPITATION FOR THE MONTH……….4.05  DEPARTURE…….+0.39
ASOS…………..3.85
TOTAL PRECIPITATION FOR THE YEAR……….25.23  DEPARTURE…….+2.02
ASOS………….25.06

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 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./0.0/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./0.0/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/…/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..    22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..    35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…./…/…/..    36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…./…/…/..    47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/…./…/…/..    M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/…./0.0/…/..           40 W   AERO 38 W    RMY 39
05/27 76/57/67/+7/…./0.0/…/..           30 NE  AERO 22 NE   RMY 27
05/28 57/48/53/-8/…./0.0/…/..           26 E   AERO 22 ESE  RMY 25

05/29 Low temp since midnight is 45F; normal low is 52F

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: Benjamin Turner