Thursday, May 19, 2022

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

THURSDAY, MAY 19, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET:  1903E

OVERCAST AND COOL WITH A LIGHT DRIZZLE MOST OF THE DAY….

Today was much chillier than days prior, with visibility
limited to 20 miles at most due to a distant layer of fog.
Wind was light and southerly for the most part, but did
increase after 10 A.M. This left us with a max gust so
far today of 25 mph.

It was drizzling lightly for most of the day, but did not
amount to anything measurable. This is, at least, one less
day the hill will experience brush fires.

We are at a rain deficit of -1.45 inches on the month and
almost -4 inches on the year!

The high so far today is 60F, which is 8 degrees below the
normal maximum of 68F. The low since midnight is 52F, which
is 3 degrees above the normal minimum of 49F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratus, very light drizzle
Temperature: 53F; Dew Point: 44F; Relative Humidity: 70%
Wind: ESE @ 7 kts
Sea-level pressure: 1010.9 mb; 29.85 in. Hg: falling unsteadily
Visibility: 20 miles, thin fog
6-hr Max temp: 60F
6-hr Min temp: 52F
24-hr Precip:  Trace
BHO SA 1155 65 OVC 20L- 109/53/44/1107/985/ THN F ALQDS PCPN
VRY LGT/ 8/07/ 57001 70000 10060 20052

10 A.M.
Weather: Overcast stratus, very light drizzle
Temperature: 53F; Dew Point: 48F; Relative Humidity: 67%
Wind: S @ 7 kts
Sea-level pressure: 1009.6 mb; 29.81 in Hg: falling, then
more slowly
Visibility: 15 miles, thin fog
3-hr Precip: Trace
BHO SA 1455 40 OVC 15L- 096/53/48/1807/981/ THN F ALQDS PCPN
VRY LGT/ 8/6// 56013 600//

1 P.M.
Weather: Overcast stratus, very light drizzle
Temperature: 53F, Dew point: 50F; Relative Humidity: 89%
Wind: S @ 10G18 kts
Sea-level pressure: 1006.9 mb; 29.73 in Hg, falling, then more
rapidly
Visibility: 20 miles, thin fog
6-hr Max temp: 55F
6-hr Min temp: 52F
6-hr Precip:  Trace
BHO SA 1755 20 OVC 20L- 069/53/50/1810G18/973/ THN F ALQDS PCPN
VRY LGT/ 8/6// 58027 600// 10055 20052

————————————————————–

SUMMARY FOR WEDNESDAY, MAY 18, 2022

TEMPERATURE (DEGREES F)
MAX…….73     NORMAL…..67
MIN…….49     NORMAL…..49
MEAN……61     NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….+3
TOTAL DEPARTURE FOR THE MONTH………………+20 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………..4  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH…………169  DEPARTURE……. -5
TOTAL HEATING UNITS FOR THE SEASON……….5533  DEPARTURE……-529
TOTAL HEATING UNITS LAST SEASON TO DATE…..5500  DEPARTURE…….+33

COOLING DEGREE DAYS (SEASON: JAN 2022 THRU DEC 2022)
TOTAL COOLING UNITS FOR YESTERDAY…………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH………….24  DEPARTURE…….+15
TOTAL COOLING UNITS FOR THE SEASON…………24  DEPARTURE…….+12
TOTAL COOLING UNITS LAST SEASON TO DATE……..1  DEPARTURE…….+20

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….39 NW  @  7:02 P.M.
AEROVANE……………….N/A
VECTOR #2 (Instantaneous)..42     @  7:02 P.M.
DAVIS #2 ………………38 NW  @  7:02 P.M.
RMY #2 (Instantaneous)…..41 NW  @  7:02 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 NW  @  7:03 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27     @  7:03 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 NW  @  7:03 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 NW  @  7:03 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE……OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.0 NW [263 total miles] VECTOR #2………………11.7
DAVIS #2……………….11.5 NW
RMY #2…………………11.5 NW
RMY #1……….OUT OF SERVICE D/T RENOVATIONS
ASOS…………OUT OF SERVICE D/T RENOVATIONS
VECTOR #1…….OUT OF SERVICE D/T RENOVATIONS
DAVIS #1……..OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH………….0.70  DEPARTURE…..-1.45
TOTAL PRECIPITATION FOR THE YEAR………….16.98  DEPARTURE…..-3.95

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

5/01  69/40/55/+2/0.00/786/93             25 SSE AERO 25 SSE RMY 27
5/02  58/42/50/-4/0.21/059/07             21 NE  AERO 19 NE  RMY 20
5/03  57/43/50/-4/0.23/229/27             23 ENE AERO 22 ENE RMY 24
5/04  52/45/49/-5/0.14/000/00             19 NW  AERO 18 SE  RMY 19
5/05  70/46/58/+3/0.00/666/78             23 NNW AERO 21 NNW RMY 23
5/06  63/49/56/+1/0.00/051/06             20 S   AERO 18 S   RMY 21
5/07  49/42/46/-9/0.00/112/13             48 ENE AERO 51 ENE RMY 50
5/08  51/40/46/-9/0.00/621/72             43 ENE AERO N/A    RMY 47
5/09  54/39/47/-9/0.00/838/97             43 ENE AERO N/A    RMY 46
5/10  57/43/50/-6/0.00/866/100            44 ENE AERO N/A    RMY 46
5/11  58/43/51/-5/0.00/182/21             36 NE  AERO N/A    RMY 38
5/12  68/48/58/+1/T/487/56                17 ENE AERO N/A    RMY 18
5/13  82/56/69/+12/0.00/619/71            33 SSW AERO N/A    RMY 34
5/14  85/63/74/+17/0.02/621/71            33 SW  AERO N/A    RMY 34
5/15  78/62/70/+13/0.03/394/45            23 SW  AERO N/A    RMY 24
5/16  83/58/71/+13/0.07/623/71            40 SSW AERO N/A    RMY 45
5/17  74/53/64/+6/T/…/..                44 W   AERO N/A    RMY 47
5/18  73/49/61/+3/…./…/..             39 NW  AERO N/A    RMY 41

5/19  The low since midnight is 52F, the daily normal low is 49F

DAILY RECORDS

05/14/2022: NEW HIGH MINIMUM TEMPERATURE RECORD OF 63F,
PREVIOUS RECORD WAS 60F SET IN 1944.

05/14/2022: TIED RECORD HIGH OF 85F, PREVIOUSLY SET IN 1961

05/15/2022: NEW RECORD HIGH MINIMUM WAS SET OF 62F,
PREVIOUS RECORD WAS 58F set in 1896, 1961, and 2004.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR MAY 19
HIGH 91F IN 1962
LOW 34F IN 2002
PRECIP 1.54 INCHES IN 1900
PEAK GUST 58 MPH NW IN 1964

RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner