Saturday, May 21, 2022

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

SATURDAY, MAY 21, 2022
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0417E
SUNSET:  1905E

WARMING UP ON THE SUMMIT AFTER SOME OVERNIGHT RAINFALL….

Today started with a fog that dissipated around noon,
leaving us with 30 miles of visibility at the 1 P.M.
observation. This followed some rainfall overnight that
left only 0.08 inches in the gauge at 7 A.M.

Wind was on the lighter side today, but mainly came in
from the southwest at less than 10 mph.

Since the 10 A.M. observation, the temperature climbed
more than 10 degrees!

The high so far today is 77F, which is 9 degrees above the
normal maximum of 68F. The low since midnight is 57F, which
is 7 degrees above the normal minimum of 50F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Fog, very light drizzle
Temperature: 62F; Dew Point: 62F; Relative Humidity: 100%
Wind: SSW @ 7 kts
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: rising, then
more rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 58F
24-hr Precip: 0.00 ins.
BHO SA 1155 X W3 1/2L-F 162/62/62/2007/001/ PCPN VRY LGT/
8//// 53016 70008 10062 20058

10 A.M.
Weather: Overcast stratus
Temperature: 66F; Dew Point: 66F; Relative Humidity: 100%
Wind: NW @ 2 kts, light and variable
Sea-level pressure: 1016.8 mb; 30.03 in Hg: rising, then
more slowly
Visibility: 1 mile, fog
3-hr Precip: Trace
BHO SA 1455 10 OVC 1F 168/66/66/3102/003/ WND L/V/ 8/6// 51006
6000/

1 P.M.
Weather: Broken cirrostratus
Temperature: 76F, Dew point: 68F; Relative Humidity: 77%
Wind: SSW @ 7 kts
Sea-level pressure: 1016.2 mb; 30.01 in Hg, rising then falling
Visibility: 30 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 62F
6-hr Precip:  Trace
BHO SA 1755 250 BKN 30 162/76/68/2207/001/ HAZY/ 8/006 55006 6000/
10076 20062

————————————————————–

SUMMARY FOR FRIDAY, MAY 20, 2022

TEMPERATURE (DEGREES F)
MAX…….75     NORMAL…..68
MIN…….49     NORMAL…..49
MEAN……62     NORMAL…..59

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…….+3
TOTAL DEPARTURE FOR THE MONTH………………+21 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………..3  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH…………181  DEPARTURE……. -9
TOTAL HEATING UNITS FOR THE SEASON……….5545  DEPARTURE……-532
TOTAL HEATING UNITS LAST SEASON TO DATE…..5501  DEPARTURE…….+44

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…….+13
TOTAL COOLING UNITS FOR THE SEASON…………24  DEPARTURE…….+10
TOTAL COOLING UNITS LAST SEASON TO DATE……..1  DEPARTURE…….+20

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….27 S   @  5:59 P.M.
AEROVANE……………….N/A
VECTOR #2 (Instantaneous)..30     @  5:59 P.M.
DAVIS #2 ………………33 S   @  8:04 P.M.
RMY #2 (Instantaneous)…..28 S   @  7:00 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………………18 S  @  8:23 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19    @  8:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S  @  8:04 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 S  @  8:21 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……..9.7 S [232 total miles] VECTOR #2………………10.3
DAVIS #2……………….9.9 S
RMY #2…………………10.3 S
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…….0.08  DEPARTURE…..-0.04
TOTAL PRECIPITATION FOR THE MONTH………….0.78  DEPARTURE…..-1.60
TOTAL PRECIPITATION FOR THE YEAR………….17.06  DEPARTURE…..-4.10

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  60/52/56/-2/…./…/..             26 S   AERO N/A    RMY 28
5/20  75/49/22/+3/T/…/..                27 S   AERO N/A    RMY 28

5/21  The low since midnight is 57F, the daily normal low is 50F

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 21
HIGH 92F IN 1921
LOW 35F IN 1907
PRECIP 1.61 INS IN 1954
PEAK GUST 74 MPH WSW IN 2006

RECORDS FOR MAY 22
HIGH 93F IN 1911
LOW 35F IN 1907
PRECIP 3.75 INCHES IN 1920
PEAK GUST 49e MPH SSW IN 1947

TODAY’S REPORT PREPARED BY: Benjamin Turner