Sunday, May 19, 2024

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

SUNDAY, MAY 19, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0418E
SUNSET:  1904E

FOGGY WITH A LIGHT NORTHEASTERLY WIND AND SOME RAINFALL….

We observed very little temperature variation today with temperatures
hanging in the low 50’s. The prevailing wind direction is northeasterly
with an average speed around 10 mph with a max gust so far today of
28 mph.

Visibility was limited due to fog, only reaching a mile before the
1 PM observation. Rain overnight totaled 0.36 inches, with an
additional 0.09 inches falling since the 7 AM observation.

The rain total for the month is 3.10 inches, 0.95 inches above
normal going into late May.

The maximum temperature so far today is 53F degrees, which is 15
degrees below the normal high of 68F. The minimum temperature since
midnight is 50F degrees, which is a degree above the normal low of
49F.

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Today’s Observations:

7 A.M.
Weather: Light Rain
Temperature: 50F; Dew Point: 50F; Relative Humidity: 100%
Wind: ENE @ 12G19 kts
Sea-level pressure: 1017.1 mb; 30.03 in. Hg: rising, then more
rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 51F
6-hr Min temp: 50F
24-hr Precip:  0.36 inches
BHO SA 1155 X W3 1/2R-F 171/50/50/0612G19/003/ 8//// 53014 70036
10051 20050

10 A.M.
Weather: Drizzle
Temperature: 51F; Dew Point: 51F; Relative Humidity: 100%
Wind: ENE @ 13G20 kts
Sea-level pressure: 1017.8 mb; 30.05 in. Hg: rising unsteadily
Visibility: 1/2 mile, fog
3-hr Precip:  0.06 inches
BHO SA 1455 X W3 1/2LF 178/51/51/0613G20/005/ 8//// 6006/ 52007

1 P.M.
Weather: Very light drizzle
Temperature: 51F; Dew Point: 51F; Relative Humidity: 100%
Wind: NE @ 8G16 kts
Sea-level pressure: 1017.4 mb; 30.04 in. Hg: rising, then falling
Visibility: 1/2 mile, fog
6-hr Max temp: 53F
6-hr Min temp: 50F
6-hr Precip:  0.09 inches
BHO SA 1755 X W3 1/2L-F 174/51/51/0508G16/004/ PCPN VRY LGT/ 8////
6009/ 58004 10053 20050

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SUMMARY FOR SATURDAY, MAY 18, 2024

TEMPERATURE (DEGREES F)
MAX…….58   NORMAL…..67
MIN…….50   NORMAL…..49
MEAN……54   NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-4
TOTAL DEPARTURE FOR THE MONTH……………………-19 [-1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………11  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE MONTH…………..186  DEPARTURE…….+11
TOTAL HEATING UNITS FOR THE SEASON…………5343  DEPARTURE……-719
TOTAL HEATING UNITS LAST SEASON TO DATE…….5118  DEPARTURE……+225

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE SEASON……………2  DEPARTURE…….-10
TOTAL COOLING UNITS LAST SEASON TO DATE………25  DEPARTURE…….-24

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E32 NE   @   6:45 P.M.
VECTOR #1 (1-Sec)……….33 ENE  @  10:36 P.M.
VECTOR #2 (1-Sec)……….32 ENE  @  10:36 P.M.
DAVIS #1……………….31 ENE  @   6:45 P.M.
DAVIS #2 ………………31 E    @  10:37 P.M.
RMY #1 (Instantaneous)…..34 NE   @   6:45 P.M.
RMY #2 (Instantaneous)…..31 ENE  @  10:36 P.M.
MERLIN…………………30 NE
RICHARDS (C5C) (Inst)……31      @  02:04 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 ENE  @   6:45 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 NE   @   6:46 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 ENE  @  10:46 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 E    @  10:38 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 E    @  10:46 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 ENE  @  10:38 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 ENE  @  10:46 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20      @  10:38 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.3 NE [295 total miles] VECTOR #1…………….11.9
VECTOR #2…………….12.4
DAVIS #1……………..12.6 ENE
DAVIS #2……………..12.4 ENE
RMY #1……………….11.7 NE
RMY #2……………….12.0 NE
RICHARDS (C5C)………..12.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.36 DEPARTURE…..+0.24
TOTAL PRECIPITATION FOR THE MONTH…………..3.10 DEPARTURE…..+0.95
TOTAL PRECIPITATION FOR THE YEAR (2024)…….28.06 DEPARTURE…..+7.13

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.9

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PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

5/1   53/42/48/-5/0.06/0.0/177/21         18 ESE VEC1 18 ESE RMY 18
5/2   69/44/57/+3/0.21/0.0/535/63         35 NE  VEC1 36 NE  RMY 35 TSTM
5/3   57/44/51/-3/0.02/0.0/408/48         24 NE  VEC1 24 NE  RMY 25
5/4   55/44/50/-4/0.00/0.0/589/69         22 ENE VEC1 21 NE  RMY 21
5/5   51/42/47/-8/0.35/0.0/000/00         21 S   VEC1 22 S   RMY 21
5/6   75/46/61/+6/0.02/0.0/343/40         20 SW  VEC1 18 SW  RMY 20
5/7   78/55/67/+12/0.00/0.0/851/99        23 NW  VEC1 24 NE  RMY 23
5/8   62/49/56/+1/0.60/0.0/078/09         30 S   VEC1 31 S   RMY 31 TSTM
5/9   63/45/54/-2/0.00/0.0/588/68         33 NW  VEC1 33 NW  RMY 34
5/10  56/42/49/-7/0.00/0.0/572/66         28 ENE VEC1 27 ENE RMY 27
5/11  55/39/47/-9/0.00/0.0/617/71         26 ENE VEC1 26 NE  RMY 27
5/12  60/41/51/-6/T/0.0/305/35            16 WSW VEC1 15 SW  RMY 15
5/13  68/45/57/0/0.00/0.0/663/76          25 S   VEC1 25 SE  RMY 26
5/14  76/48/62/+5/T/0.0/…/..            33 SSW VEC1 33 SSW RMY 32
5/15  73/53/63/+6/0.46/0.0/…/..         24 ENE VEC1 24 E   RMY 24
5/16  56/52/54/-4/1.02/0.0/…/..         32 ENE VEC1 32 ENE RMY 31
5/17  66/50/58/0/…/0.0/…/..           29 ENE VEC1 28 ENE RMY 27
5/18  58/50/54/-4/…/…/../..          32 NE  VEC1 33 NE  RMY 34

5/19 The low since midnight is 50F, the daily normal low is 49F.

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MAY DAILY RECORDS TO DATE

NONE…

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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 1.97 INCHES IN 2023
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner