Monday, May 29, 2023

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

MONDAY, MAY 29, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0412E
SUNSET:  1912E

MUCH COOLER, BREEZY, AND BEAUTIFUL TODAY….

Today has been much cooler than yesterday, with temperatures barely
reaching 65F. Clear skies have been observed today, with a thin
layer of smoke aloft moving into the area during the late morning
hours. A few cirrus clouds have been observed to our south.

The wind has been rather gusty today, blowing generally from the
ENE. Gusts were frequently above 30mph this morning and have tapered
off a bit but still reaching in the 20’s. The average speed for the
day so far is around 15mph.

Visibility has remained between 40 and 50 miles today, due to the
hazy conditions that have been steady throughout the day.

The maximum temperature so far today is 65F, which is 5F below
the normal high of 70F. The minimum temperature so far since
midnight is 58F, which is 6 degrees above the normal low of 52F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant NE-E, few cirrus distant N-E and distant SE-SW
Temperature: 62F; Dew Point: 42F; Relative Humidity: 47%
Wind: ENE @ 15G26 kts, peak wind ENE 30 mph @ 6:47am
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 58F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 40 194/62/42/0615G26/010/ FEW AC DSNT NE-E FEW CI DSNT N-E AND DSNT SE-SW HAZY PK WND 0726/47/ 8/051 51035 10062 20058

10 A.M.
Weather: Clear, few cirrus distant SSE-SSW, thin smoke later aloft all quadrants
Temperature: 62F; Dew Point: 40F; Relative Humidity: 40%
Wind: ENE @ 16G27 kts, peak wind ENE 37 mph @ 8:57am
Sea-level pressure: 1017.6 mb; 30.05 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 CLR 40 176/62/40/0716G27/005/ FEW CI DSNT SSE-SSW THN K LYR ALF ALQDS HAZY PK WND 0632/57/ 8/001 51018

1 P.M.
Weather: Clear, few cirrus distant SE-WSW, thin smoke layer aloft all quadrants
Temperature: 60F; Dew Point: 40F; Relative Humidity: 47%
Wind: ENE @ 15G24 kts, peak wind ENE 32 mph @ 11:59am
Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising steadily
Visibility: 50 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 60F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 50 182/60/40/0715G24/007 FEW CI DSNT SE-WSW THN K LYR ALF ALQDS HAZY PK WND 0728/59/ 8/001 52006 10065 20060

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SUMMARY FOR SUNDAY, MAY 28, 2023

TEMPERATURE (DEGREES F)
MAX…….86   NORMAL…..70
MIN…….56   NORMAL…..52
MEAN……71   NORMAL…..61

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+10
TOTAL DEPARTURE FOR THE MONTH………………..+33 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………..199  DEPARTURE…….-43
TOTAL HEATING UNITS FOR THE SEASON…………5170  DEPARTURE……-959
TOTAL HEATING UNITS LAST SEASON TO DATE…….5566  DEPARTURE……-396

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….6  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………22  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE SEASON…………..31  DEPARTURE……..+8
TOTAL COOLING UNITS LAST SEASON TO DATE………51  DEPARTURE…….-20

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)……….E23 SW  @  03:43 P.M.
VECTOR #1 (1-Sec)……….24 SW  @  03:42 P.M.
VECTOR #2 (1-Sec)……….26 SSW @  03:43 P.M.
DAVIS #1……………….23 SW  @  01:22 P.M.
DAVIS #2 ………………24 SSE @  04:32 P.M.
RMY #1 (Instantaneous)…..25 WSW @  01:22 P.M.
RMY #2 (Instantaneous)…..25 SSW @  01:43 P.M.
MERLIN…………………40 ENE
RICHARDS (C5C) (Inst)……25     @  01:43 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 SSW @  07:01 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18     @  04:06 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @  04:07 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 WSW @  01:24 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SW  @  04:07 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SW  @  04:07 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SSW @  04:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17     @  02:17 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………11.7 SW [280 total miles] VECTOR #1……………….12.6
VECTOR #2……………….13.2
DAVIS #1………………..11.5 SW
DAVIS #2………………..12.0 WSW
RMY #1………………….11.5 SW
RMY #2………………….12.0 WSW
RICHARDS (C5C)…………..11.3

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…..-0.85
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.43

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/…/..         20 N    VEC1 21 N   RMY 22
5/27  80/48/64/+4/0.00/0.0/…/..         23 SSW  VEC1 23 SSW RMY 23
5/28  86/56/71/+10/0.00/0.0/…/..        23 SW   VEC1 24 SW  RMY 25

5/29 The low since midnight is 58F, the daily normal low is 52F

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 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945

RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.28 INS 1948
PEAK GUST 61e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Amanda Joly