Saturday, June 3, 2023

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

SATURDAY, JUNE 3, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0409E
SUNSET:  1916E

A COLD AND RAINY DAY WITH LOW VISIBILITY AND FOG….

Today started at 48F at the 7 o’clock observation, got up
to 49F, and has dropped back down to 47F at the 1 o’clock
observation, 43 degrees below our high temperature yesterday!

Foggy conditions persist and visibility has rarely gone past
1/8th of a mile throughout the day with only glimpses of not too
distant buildings between showers.

So far, the high temperature since midnight was 53F occurring right
after midnight, and a low of 47F occurred at about 1 PM.

Yesterday’s high temperature of 91F tied the previous record of
91F set in 1895!

BHO Highest May Bright Sunshine, hours (1885-2023):

1) 329.9 in 2023 [75%] 2) 318.9 in 1964 [73%] 3) 304.4 in 1977 [70%] 4) 295.8 in 1955 [68%] 5) 288.4 in 1991 [66%]

BHO Highest Monthly Bright Sunshine, hours (1885-2023):

1) 336.1 in June 1971 [76%] 2) 335.5 in June 1908 [76%] 3) 331.6 in July 1952 [75%] 4) 329.9 in May 2023 [75%] 5) 327.4 in June 1953 [74%] 6) 326.4 in July 1966 [73%] 7) 322.6 in June 1949 [73%] 322.6 in July 2022 [73%]

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PRELIMINARY STATS FOR MAY 2023

TEMPERATURE, Deg. F
Avg. Max. 69.4 [+2.6] Avg. Min. 47.0 [-1.2] Mean      58.2 [+0.7] 24-hour corrected mean: 57.7
Max. for month: 86F on the 28th
Min. for month: 34F on the 18th

HEATING DEGREE DAYS
Total heating units:    225 [-033] Total for the season:  5196 [-949] Total for last season: 5566

COOLING DEGREE DAYS
Total cooling units:     22 [-003] Total for the season:    31 [+003] Total for last season:   60

PRECIPITATION, Inches
Total: 2.55 [-1.27] Greatest in 24 hrs: 2.06 on the 20th-21st

SNOWFALL, Inches
Total: 0.0 [0.0] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 10.9 mph
Avg. corrected wind speed:   11.3 mph
Prevailing wind direction:   South-southwest [12%] Peak gust and direction:  44 SSE on the 1st

SUNSHINE:
Campbell-Stokes card minutes: 19794 of a possible 26226, or 75%
Astronomical total minutes: 20482 of a possible 27167, or 75%

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Today’s Observations:

7 A.M.
Weather: Light rain
Temperature: 48F; Dew Point: 48F; Relative Humidity: 100%
Wind: ENE @ 11 kts
Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 52F
6-hr Min temp: 48F
24-hr Precip:  0.55 inches
BHO SA 1155 W3 X L-F 1/8 182/48/48/0611/007/ 8//// 53019 10052 20048
70055

10 A.M.
Weather: Light rain
Temperature: 48F; Dew Point: 48F; Relative Humidity: 100%
Wind: NE @ 12 kts
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: rising, then more quickly
Visibility: 1/8 mile, fog
3-hr Precip:  Trace
BHO SA 1455 W3 X L-F 1/8 197/48/48/0512/011/ 8//// 52015 600//

1 P.M.
Weather: Light rain
Temperature: 48F; Dew Point: 48F; Relative Humidity: 100%
Wind: NE @ 11 kts
Sea-level pressure: 1020.4 mb; 30.13 in. Hg: rising unsteadily
Visibility: 1/8 mile, fog
6-hr Max temp: 48F
6-hr Min temp: 48F
6-hr Precip:  0.02 inches
BHO SA 1755 W3 X L-F 1/8 204/48/48/0411/013/ 8//// 53007 6002/

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SUMMARY FOR FRIDAY, JUNE 2, 2023

TEMPERATURE (DEGREES F)
MAX…….91   NORMAL…..71
MIN…….53   NORMAL…..53
MEAN……72   NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+10
TOTAL DEPARTURE FOR THE MONTH………………..+20 [+9.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE SEASON…………5196  DEPARTURE……-967
TOTAL HEATING UNITS LAST SEASON TO DATE…….5587  DEPARTURE……-391

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….7  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………14  DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE SEASON…………..45  DEPARTURE…….+14
TOTAL COOLING UNITS LAST SEASON TO DATE………60  DEPARTURE…….-15

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)……….E67 ENE @  08:56 P.M.
VECTOR #1 (1-Sec)……….38 ENE @  08:55 P.M.
VECTOR #2 (1-Sec)……….41 ENE @  08:56 P.M.
DAVIS #1……………….35 ENE @  08:56 P.M.
DAVIS #2 ………………36 E   @  08:56 P.M.
RMY #1 (Instantaneous)…..37 ENE @  09:32 P.M.
RMY #2 (Instantaneous)…..41 ENE @  08:56 P.M.
MERLIN…………………34 ENE
RICHARDS (C5C) (Inst)……34     @  08:56 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 N   @  06:33 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25     @  06:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26     @  06:34 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 ENE @  08:58 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NNE @  06:34 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 ENE @  09:08 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 N   @  06:34 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16     @  01:43 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.6 WSW [207 total miles] VECTOR #1……………….8.9
VECTOR #2……………….9.3
DAVIS #1………………..9.0 NE
DAVIS #2………………..9.1 NE
RMY #1………………….8.8 N
RMY #2………………….9.1 NNW
RICHARDS (C5C)…………..9.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.55 DEPARTURE…..+0.39
TOTAL PRECIPITATION FOR THE MONTH…………..0.55 DEPARTURE…..+0.23
TOTAL PRECIPITATION FOR THE YEAR…………..21.30 DEPARTURE…..-1.62

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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 TSTM
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/-4/0.00/0.0/802/90         17 SE   VEC1 18 SE  RMY 18
5/24  75/44/60/0/0.04/0.0/697/78          35 NW   VEC1 36 NW  RMY 38
5/25  67/47/57/-3/0.00/0.0/760/85         25 NNW  VEC1 25 NNW RMY 26
5/26  70/44/57/-3/0.00/0.0/850/95         20 N    VEC1 21 N   RMY 22
5/27  80/48/64/+4/0.00/0.0/870/97         23 SSW  VEC1 23 SSW RMY 23
5/28  86/56/71/+10/0.00/0.0/845/94        23 SW   VEC1 24 SW  RMY 25
5/29  65/48/57/-4/0.00/0.0/873/97         43 ENE  VEC1 44 ENE RMY 45
5/30  71/46/59/-2/0.00/0.0/875/97         21 SSW  VEC1 21 SSW RMY 21
5/31  80/45/63/+1/0.00/0.0/777/86         20 SSW  VEC1 20 SSW RMY 20

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

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

6/1   88/56/72/+10/0.00/…/..            21 WSW  VEC1 21 WSW RMY 21
6/2   91/53/7/+10/…./…/..             37 ENE  VEC1 39 ENE RMY 37

6/3 The low since midnight is 47F, the daily normal low is 54F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR JUNE 3
HIGH 98F IN 1919
LOW 38F IN 1929
PRECIP 2.40 INS 2006
PEAK GUST 47 MPH NW IN 1998

RECORDS FOR JUNE 4
HIGH 99F IN 1919 [Record for month] LOW 41F IN 1915,1926
PRECIP 1.52 INS IN 2007
PEAK GUST 48 MPH SSE IN 1983

TODAY’S REPORT PREPARED BY: Samantha Richard