Saturday, May 27, 2023

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

SATURDAY, MAY 27, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0413E
SUNSET:  1910E

BEAUTIFUL SUNNY DAY WITH MINIMAL CLOUDS AND GREAT VISIBILITY….

Like yesterday, today’s weather has been exceptional! With lots of
sun and minimal cloud cover, beautiful spring colors are vibrant
around the hill, and tower observations were especially enjoyable.

Our high temperature so far today was 79F. This morning was pleasant
with cooler temperatures to start out at 57F at the 7 o’clock
observation, which rose steadily throughout the rest of the day.

Winds have been relatively light with only gusts up to about 15 mph
so far.

We expect the rest of the day to look great, and are looking forward
to a beautiful rest of this Memorial Day weekend!

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Today’s Observations:

7 A.M.
Weather: Clear, distant fog SE-E
Temperature: 57F; Dew Point: 31F; Relative Humidity: 36%
Wind: N @ 7 kts
Sea-level pressure: 1027.9 mb; 30.35 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 48F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 70 279/57/31/0107/035/ DSNT FOG SE-E/ 8/000 53009
10057 20048

10 A.M.
Weather: Clear, few cumulus south few cirrostratus in all directions
Temperature: 70F; Dew Point: 36F; Relative Humidity: 27%
Wind: N @ 4 kts
Sea-level pressure: 1027.5 mb; 30.34 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip:  0.00 inches
BHO SA 1455 CLR 70 275/70/36/0104/034/ FEW CU S FEW CS ALQDS/
8/105 50004

1 P.M.
Weather: Clear
Temperature: 77F; Dew Point: 35F; Relative Humidity: 21%
Wind: N @ 5 kts
Sea-level pressure: 1026.2 mb; 30.30 in. Hg: falling unsteadily
Visibility: 70 miles
6-hr Max temp: 79F
6-hr Min temp: 57F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 70 262/77/35/0105/030/ 8/000 57013 10079 20057

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SUMMARY FOR FRIDAY, MAY 26, 2023

TEMPERATURE (DEGREES F)
MAX…….70   NORMAL…..70
MIN…….44   NORMAL…..51
MEAN……57   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-3
TOTAL DEPARTURE FOR THE MONTH………………..+25 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….8  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..198  DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON…………5169  DEPARTURE……-948
TOTAL HEATING UNITS LAST SEASON TO DATE…….5566  DEPARTURE……-397

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………16  DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………..25  DEPARTURE……..+6
TOTAL COOLING UNITS LAST SEASON TO DATE………47  DEPARTURE…….-22

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)……….E20 N   @  12:39 P.M.
VECTOR #1 (1-Sec)……….21 N   @  09:56 A.M.
VECTOR #2 (1-Sec)……….22 N   @  09:21 A.M.
DAVIS #1……………….20 N   @  09:56 A.M.
DAVIS #2 ………………24 S   @  08:54 P.M.
RMY #1 (Instantaneous)…..22 N   @  09:56 A.M.
RMY #2 (Instantaneous)…..22 N   @  09:21 A.M.
MERLIN…………………18 N
RICHARDS (C5C) (Inst)……21     @  09:56 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 E   @  05:46 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15     @  05:50 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  05:50 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 SSE @  05:51 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S   @  08:13 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SE  @  05:50 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 S   @  09:05 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15     @  05:50 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.7 NW [209 total miles] VECTOR #1……………….9.0
VECTOR #2……………….9.6
DAVIS #1………………..8.9 NW
DAVIS #2………………..9.4 N
RMY #1………………….8.9 NNW
RMY #2………………….9.5 NNW
RICHARDS (C5C)…………..9.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-0.59
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.17

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 (2022-2023)……34.9 DEPARTURE…..-34.8

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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

5/1   63/45/54/+1/0.04/0.0/540/64         44 SSE  VEC1 46 SSE RMY 48
5/2   57/43/50/-4/0.22/0.0/144/17         33 S    VEC1 34 S   RMY 35
5/3   55/42/49/-5/0.01/0.0/093/11         25 E    VEC1 25 E   RMY 25
5/4   45/40/43/-11/0.07/0.0/009/01        29 NE   VEC1 29 NE  RMY 29
5/5   59/43/51/-4/0.07/0.0/367/43         18 NE   VEC1 19 NE  RMY 19
5/6   74/43/59/+4/0.00/0.0/847/99         25 NW   VEC1 26 NW  RMY 26
5/7   78/52/65/+10/0.01/0.0/789/92        26 WNW  VEC1 27 W   RMY 28
5/8   74/49/62/+7/0.03/0.0/800/93         32 NW   VEC1 33 NW  RMY 35
5/9   60/45/53/-3/0.00/0.0/819/95         24 NE   VEC1 25 NE  RMY 25
5/10  72/51/62/+6/0.00/0.0/830/96         25 WSW  VEC1 26 WSW RMY 26
5/11  81/53/67/+11/T/0.0/729/84           30 W    VEC1 30 W   RMY 30
5/12  84/57/71/+14/T/0.0/687/79           31 WNW  VEC1 35 WNW RMY 34
5/13  81/58/70/+13/0/0.0/715/82           28 NNW  VEC1 30 NNW RMY 35
5/14  66/47/57/0/0.00/0.0/822/94          28 NNW  VEC1 29 NNW RMY 31
5/15  72/45/59/+2/0.00/0.0/675/77         33 W    VEC1 35 W   RMY 34
5/16  80/55/68/+10/0.00/0.0/500/57        38 SW   VEC1 39 SW  RMY 41
5/17  62/37/50/-8/0.00/0.0/836/95         36 NNW  VEC1 37 NNW RMY 40
5/18  64/34/49/-9/0.00/0.0/847/96         26 SSW  VEC1 28 SSW RMY 28
5/19  68/42/55/-3/0.00/0.0/751/85         36 SSW  VEC1 36 SSW RMY 34
5/20  65/51/58/-1/1.97/0.0/018/02         38 S    VEC1 39 S   RMY 39
5/21  73/55/64/+5/0.09/0.0/533/60         29 SSW  VEC1 30 SSW RMY 31
5/22  59/46/53/-6/0.00/0.0/782/88         36 ENE  VEC1 38 ENE RMY 39
5/23  65/45/55/-4/0.00/0.0/…/..         17 SE   VEC1 18 SE  RMY 18
5/24  75/44/60/0/0.04/0.0/…/..          35 NW   VEC1 36 NW  RMY 38
5/25  67/47/57/-3/0.00/0.0/…/..         25 NNW  VEC1 25 NNW RMY 26
5/26  70/44/57/-3/0.00/0.0/…/..         9  N    VEC1 21 N   RMY 22

5/27 The low since midnight is 48F, the daily normal low is 51F

DAILY RECORDS

05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002

05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969

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: Samantha Richard