Friday, May 26, 2023

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

FRIDAY, MAY 26, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0414E
SUNSET:  1909E

A TOP 10 KIND OF DAY HERE ON BLUE HILL….

Today’s weather has been spectacular, with plenty of blue skies
only dotting by a few small cumulus clouds. Brilliant amounts
of sunshine is the theme with very pleasant temperatures in
the upper 60s to low 70s. The air is dry however with the dew
point down into the mid to upper 30s.

The wind has been on the light side today, out of a northerly
direction. The speed has only been averaging around 8mph for
the day so far.

Visibility has been quite decent today, holding at around 70
miles all day!

The high temperature so far today is 70F, which is 1 degree
above the normal high of 69F. The low since midnight is 44F,
which is 7 degrees below the normal low of 51F.

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Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant N-NNE and distant SE-SSW
Temperature: 53F; Dew Point: 39F; Relative Humidity: 57%
Wind: NNW @ 7 kts
Sea-level pressure: 1024.3 mb; 30.25 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 53F
6-hr Min temp: 44F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 70 243/53/39/3307/025/ FEW CI DSNT N-NNE AND
DSNT SE-SSW/ 8/001 53015 10053 20044

10 A.M.
Weather: Clear, few small cumulus all quadrants
Temperature: 65F; Dew Point: 34F; Relative Humidity: 31%
Wind: N @ 8G17 kts
Sea-level pressure: 1023.6 mb; 30.23 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip:  0.00 inches
BHO SA 1455 CLR 70 236/65/34/3508G17/023/ FEW SML CU ALQDS/
8/100 58007

1 P.M.
Weather: Clear, few small cumulus all quadrants
Temperature: 68F; Dew Point: 38F; Relative Humidity: 33%
Wind: NNE @ 5 kts, wind light and variable
Sea-level pressure: 1022.6 mb; 30.20 in. Hg: falling unsteadily
Visibility: 70 miles
6-hr Max temp: 70F
6-hr Min temp: 53F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 70 226/68/38/0205/020/ FEW SML CU ALQDS WND L/V/
8/100 57010 10070 20053

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SUMMARY FOR THURSDAY, MAY 25, 2023

TEMPERATURE (DEGREES F)
MAX…….67   NORMAL…..69
MIN…….47   NORMAL…..51
MEAN……57   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-3
TOTAL DEPARTURE FOR THE MONTH………………..+22 [+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…………..190  DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………5161  DEPARTURE……-950
TOTAL HEATING UNITS LAST SEASON TO DATE…….5560  DEPARTURE……-399

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)……….E25 NNW @  05:05 P.M.
VECTOR #1 (1-Sec)……….25 NWW @  12:42 A.M.
VECTOR #2 (1-Sec)……….27 N   @  04:45 A.M.
DAVIS #1……………….24 WNW @  05:05 P.M.
DAVIS #2 ………………24 NNE @  04:02 A.M.
RMY #1 (Instantaneous)…..26 NNW @  05:05 P.M.
RMY #2 (Instantaneous)…..27 N   @  04:02 A.M.
MERLIN…………………23 NW
RICHARDS (C5C) (Inst)……24     @  12:42 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 NW  @  05:08 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16     @  04:26 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16     @  04:04 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 NW  @  03:04 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 N   @  03:37 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 NNW @  03:04 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NNW @  03:37 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16     @  03:04 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………10.0 NNW [239 total miles] VECTOR #1……………….10.0
VECTOR #2……………….10.2
DAVIS #1………………..10.0 NNW
DAVIS #2………………..10.1 N
RMY #1…………………. 9.7 NNW
RMY #2………………….10.0 NNW
RICHARDS (C5C)…………..10.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-0.45
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.03

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 The low since midnight is 44F, 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 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: Matt Douglas