Wednesday, May 26, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY MAY 26, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0414E
SUNSET: 1910E
ANOTHER WARM AND HAZY DAY ATOP GREAT BLUE HILL….
Today was on the warmer side, with hazy conditions
playing a factor regarding visibility. Only 20 miles
were seen most of the day, with the highest visibility
being 25 miles at the 7 A.M. observation. Skies are
partly cloudy, mostly consisting of a translucent layer
of altostratus clouds.
Otherwise the last measurable rainfall occurred 10 days ago
with only 0.01″ being measured. The monthly deficit has
exceeded an inch and a quarter, and the annual total is
almost 5 inches below normal.
The high so far today is 86F, which is 15 degrees above
the normal high of 69F. The low since midnight is 57F,
which is 6 degrees above the daily normal low of 51F.
Today’s Observations:
7 A.M.
Weather: Scattered altostratus, few cumulus
Temperature: 65F; Dew Point: 57F; Relative Humidity: 75%
Wind: SW @ 12 kts
Sea-level pressure: 30.02 in. Hg; falling steadily
Visibility: 25 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 120 SCT 25 166/65/57/2212/002/ FEW CU ALQDS HAZY/
8/110 58006 10065 20057
10 A.M.
Weather: Scattered altostratus and cirrostratus, few
cumulus
Temperature: 78F; Dew Point: 63F; Relative Humidity: 60%
Wind: SSW @ 10G16 kts
Sea-level pressure: 30.00 in Hg; falling, then more slowly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 120 SCT 250 SCT 20 158/78/63/2110G16/000/ FEW
CU ALQDS HAZY/ 8/116 58008
1 P.M.
Weather: Scattered altostratus and cirrostratus,
few cumulus
Temperature: 84F, Dew point: 66F; Relative Humidity: 55%
Wind: SSW @ 17G24 kts
Sea-level pressure: 29.93 in Hg; falling, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 140 SCT 250 SCT 20 136/84/66/2017G24/993/ FEW CU
ALQDS HAZY/ 8/116 58022 10086 20065
SUMMARY FOR TUESDAY, MAY 25, 2021
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..69
MIN…….47 NORMAL…..51
MEAN……61 NORMAL…..60
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +1
TOTAL DEPARTURE FOR THE MONTH……………….+67 [+2.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 4 DEPARTURE…….-2
TOTAL HEATING UNITS FOR THE MONTH…………..170 DEPARTURE……-64
TOTAL HEATING UNITS FOR THE SEASON…………5511 DEPARTURE…..-758
TOTAL HEATING UNITS LAST SEASON TO DATE…….5803 DEPARTURE…..-292
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-1
TOTAL COOLING UNITS FOR THE MONTH……………19 DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE SEASON…………..19 DEPARTURE…….+3
TOTAL COOLING UNITS LAST SEASON TO DATE……… 3 DEPARTURE……+16
PEAK WIND GUST (MPH):
420C/Official…………..31 SE @ 2:18 P.M.
AEROVANE (south tower)…..35 SW @ 2:19 P.M.
ASOS…………………..32 SW @ 2:19 P.M.
DAVIS #1……………….31 SSW @ 11:44 A.M.
DAVIS #2 (south tower)…..33 SSE @ 4:06 P.M.
RMY……………………34 @ 2:18 P.M.
VECTOR…………………38 @ 2:39 P.M.
MERLIN…………………36
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 SW @ 12:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 SW @ 12:19 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 SW @ 12:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 SW @ 12:18 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..23 SSW @ 11:09 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..24 @ 2:38 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….16.2 SSW [389 total miles] ASOS………………….15.7
DAVIS #1………………15.4 SW
DAVIS #2………………16.8 SSW
RMY…………………..15.8 SSW
VECTOR………………..16.4
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………….1.80 DEPARTURE….-1.41
ASOS………….1.75
TOTAL PRECIPITATION FOR THE YEAR………….16.86 DEPARTURE….-4.90
ASOS………..17.03
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 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 26
HIGH 94F IN 2010
LOW 37F IN 1972,2013
PRECIP 1.73 INS IN 2003
SNOWFALL TRACE IN 1967 (Fell as ice pellets in nor’easter)
PEAK GUST 62 MPH NE IN 1967
RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956
TODAY’S REPORT PREPARED BY: Benjamin Turner
