Thursday, May 27, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY MAY 27, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0413E
SUNSET: 1910E
A COOLER DAY FOLLOWING SOME RAINFALL
LAST NIGHT….
A passing thunder shower last night watered the plants
with a quarter inch of rainfall. This puts a very small
dent in the rainfall deficit, as the summit is still
-1.33 inches below normal on the month and -4.82 inches
below normal on the year.
Today was hazy just like the day before, only reaching
a maximum visibility of 35 miles. Skies have been
partly cloudy with more puffy cumulus popping up as the
day went on. Wind is northwesterly at 10 mph, with a
max gust so far of 25 mph.
The high so far today is 79F, which is 10 degrees above
the normal high of 69F. The low since midnight is 63F,
which is 12 degrees above the daily normal low of 51F.
Today’s Observations:
7 A.M.
Weather: Scattered altostratus and cirrostratus,
few cumulus NE-S
Temperature: 66F; Dew Point: 64F; Relative Humidity: 93%
Wind: W @ 9 kts
Sea-level pressure: 29.86 in. Hg; rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 66F
6-hr Min temp: 63F
24-hr Precip: 0.23 ins.
BHO SA 1155 120 SCT 250 SCT 25 113/66/64/2809/986/ FEW CU
NE-S HAZY/ 8/184 70023 53008 10066 20063
10 A.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 73F; Dew Point: 57F; Relative Humidity: 57%
Wind: WNW @ 11G21 kts
Sea-level pressure: 29.90 in Hg; rising, then more slowly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 250 SCT 35 125/73/57/2911G21/990/ HAZY/
8/108 53012
1 P.M.
Weather: Scattered cumulus
Temperature: 75F, Dew point: 54F; Relative Humidity: 48%
Wind: NW @ 8 kts
Sea-level pressure: 29.89 in Hg; falling, then steady
Visibility: 35 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 55 SCT 35 122/75/54/3108/989/ HAZY/ 8/100 58003
10079 20066
SUMMARY FOR WEDNESDAY, MAY 26, 2021
TEMPERATURE (DEGREES F)
MAX…….86 NORMAL…..69
MIN…….57 NORMAL…..51
MEAN……72 NORMAL…..60
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+12
TOTAL DEPARTURE FOR THE MONTH……………….+79 [+2.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-6
TOTAL HEATING UNITS FOR THE MONTH…………..170 DEPARTURE……-71
TOTAL HEATING UNITS FOR THE SEASON…………5511 DEPARTURE…..-764
TOTAL HEATING UNITS LAST SEASON TO DATE…….5803 DEPARTURE…..-292
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….+6
TOTAL COOLING UNITS FOR THE MONTH……………19 DEPARTURE…….+4
TOTAL COOLING UNITS FOR THE SEASON…………..19 DEPARTURE…….+2
TOTAL COOLING UNITS LAST SEASON TO DATE……… 7 DEPARTURE……+12
PEAK WIND GUST (MPH):
420C/Official…………..30 S @ 3:46 P.M.
AEROVANE (south tower)…..36 S @ 3:37 P.M.
ASOS…………………..34 S @ 3:46 P.M.
DAVIS #1……………….31 S @ 3:45 P.M.
DAVIS #2 (south tower)…..36 SSE @ 2:43 P.M.
RMY……………………35 @ 3:20 P.M.
VECTOR…………………35 @ 3:45 P.M.
MERLIN…………………33
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 S @ 4:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S @ 2:47 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 SSW @ 2:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S @ 3:37 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..23 S @ 3:34 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..24 @ 2:50 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….14.8 SSW [305 total miles] ASOS………………….14.3
DAVIS #1………………14.1 SW
DAVIS #2………………15.4 SW
RMY…………………..14.3 SW
VECTOR………………..14.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…… 0.23 DEPARTURE….+0.08
ASOS………….0.22
TOTAL PRECIPITATION FOR THE MONTH………….2.03 DEPARTURE….-1.33
ASOS………….1.97
TOTAL PRECIPITATION FOR THE YEAR………….17.09 DEPARTURE….-4.82
ASOS………..17.25
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 62/38/50/-3/0.06/0.0/659/78 31 WNW AERO 35 WNW RMY 40
05/02 76/48/62/+9/0.01/0.0/220/26 41 SW AERO 41 SW RMY 46
05/03 67/48/58/+5/0.07/0.0/400/47 21 E AERO 20 E RMY 20
05/04 50/44/47/-7/0.78/0.0/000/00 36 NNE AERO 32 NNE RMY 37
05/05 48/44/46/-8/0.47/0.0/000/00 18 ESE AERO 14 ESE RMY 17
05/06 64/45/55/+1/0.00/0.0/780/91 33 NW AERO 38 NNW RMY 39
05/07 61/43/52/-3/0.00/0.0/516/60 28 ESE AERO 22 ESE RMY 26
05/08 54/40/47/-8/0.00/0.0/069/08 24 SSW AERO 23 SSW RMY 25
05/09 66/42/54/-1/T/0.0/579/67 30 SW AERO 29 SW RMY 34
05/10 60/45/53/-2/0.39/0.0/078/09 21 W AERO 20 W RMY 20
05/11 63/45/54/-2/0.00/0.0/764/88 38 WNW AERO 41 WNW RMY 41
05/12 65/41/53/-3/0.00/0.0/722/83 28 NW AERO M M RMY 31
05/13 69/45/57/+1/0.00/0.0/759/87 22 WNW AERO 21 WNW RMY 21
05/14 76/49/63/+8/0.00/0.0/725/83 23 WNW AERO 23 WNW RMY 25
05/15 75/55/65/+8/0.01/0.0/569/65 24 SSE AERO 26 SSE RMY 26
05/16 78/54/66/+9/0.01/0.0/483/55 36 W AERO 37 W RMY 42
05/17 77/52/65/+8/0.00/0.0/…/.. 20 SSW AERO 21 SSW RMY 21
05/18 81/54/68/+10/T/0.0/…/.. 32 W AERO 30 W RMY 32
05/19 75/55/65/+7/0.00/0.0/…/.. 25 NE AERO 23 NNE RMY 27
05/20 75/52/64/+6/0.00/0.0/…/.. 18 ESE AERO 18 ESE RMY 19
05/21 78/50/64/+5/T/0.0/…/.. 23 S AERO 22 S RMY 26
05/22 87/56/72/+13/T/0.0/…/.. 25 WNW AERO 21 WNW RMY 24
05/23 87/58/73/+14/T/0.0/…/.. 38 NNW AERO 37 NNW RMY 40
05/24 70/49/60/+1/0.00/0.0/…/.. 30 S AERO 35 S RMY 33
05/25 75/47/61/+1/0.00/0.0/…/.. 31 SW AERO 35 SW RMY 34
05/26 86/57/72/+12/…./0.0/…/.. 30 S AERO 36 S RMY 35
05/27 The low since midnight is 57F, the daily normal low is 51F
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
