Wednesday, June 10, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 10, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A HAZY, YET COOLER DAY WITH A SEA BREEZE….

We observed 40 miles of visibility at best, due
to haze that became more significant as the day
went on. Despite a steady rise in pressure, the
sky remained mostly cloudy, with a translucent
layer of cirrostratus clouds. Humidity stayed
around 70% for the majority of the day, with
temperatures hanging mostly below 70F. Winds
were northeasterly, with a max gust of 19 mph
since 7 A.M.

The high so far today is 70 degrees, this is 4
degrees below the daily normal high of 74F. The
low since midnight is 59F, which is 3 degrees
above the daily normal low of 56F.

PRELIMINARY STATS FOR MAY 2020

TEMPERATURE, Deg. F
Avg. Max. 67.2 [+0.9] Avg. Min. 45.8 [-2.0] Mean      56.5 [-0.6] 24-hour corrected mean: 56.1
Max. for month: 84F on the 27th
Min. for month: 31F on the 10th

HEATING DEGREE DAYS
Total heating units:    291 [+21] Total for the season:  5812 [-491] Total for last season: 5432

COOLING DEGREE DAYS
Total cooling units:    32  [+10] Total for the season:   32  [+8] Total for last season:   8

PRECIPITATION, Inches
Total: 2.75 [-1.36] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: Trace
Greatest in 24 hrs: Trace on the 9th

WIND, mph
Avg. uncorrected wind speed: 12.3 mph
Avg. corrected wind speed:   12.7 mph
Prevailing wind direction:   W [16%] Peak gust and direction:     52 W on the 9th

SUNSHINE:
Campbell-Stokes card minutes: 16248 minutes of possible 26226 or 62%
Astronomical total minutes: 16872 minutes of possible 27210 or 62%

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 63F; Dew Point: 55F; Relative Humidity: 74%
Wind: ENE at 11 kts
Sea-level pressure: 30.09 ins. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr Precip:  trace
24-hr Snowfall: 0.0 ins.
BHO SA 1155 80 SCT E250 BKN 40 188/63/55/0711/009/ HAZY/
8/068 53014 10062 20059

10 A.M.
Weather: Broken cirrostratus
Temperature: 67F; Dew Point: 56F; Relative Humidity: 68%
Wind: NE at 10G17 kts
Sea-level pressure: 30.10 ins. Hg: falling, then rising
Visibility: 35 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E220 BKN 35 192/67/56/0410G17/010/ HAZY/ 8/008
51004

1 P.M.
Weather: Broken cirrostratus
Temperature: 67F; Dew Point: 58F; Relative Humidity: 71%
Wind: NE at 9 kts
Sea-level pressure: 30.11 ins. Hg: rising steadily
Visibility: 30 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 63F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E220 BKN 30 196/67/58/0509/011/ HAZY/ 8/008 51004
10070 20063

SUMMARY FOR TUESDAY, JUNE 9, 2020

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..73
MIN…..60   NORMAL…..55
MEAN….69   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL……………..+5
TOTAL DEPARTURE FOR THE MONTH…………….+26 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………23  DEPARTURE…….-14
TOTAL HEATING UNITS FOR THE SEASON…………5835  DEPARTURE……-505
TOTAL HEATING UNITS LAST SEASON TO DATE…….6234  DEPARTURE……-399

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 4  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH……………31  DEPARTURE…….+12
TOTAL COOLING UNITS FOR THE SEASON…………..63  DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE………26  DEPARTURE…….+37

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 E   AT  9:43 P.M.
AERO…………………….21 E   AT  9:43 P.M.
ASOS…………………….22 E   AT  9:42 P.M.
DAVIS……………………21 E   AT  9:21 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….16 E   AT  8:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 E   AT  8:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 E   AT  9:42 P.M.
AVERAGE WIND SPEED AND DIRECTION………….. 6.6 E
ASOS………………….. 7.5
DAVIS…………………..7.5 ENE [61 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.29  DEPARTURE……-0.20
ASOS…………..1.27
TOTAL PRECIPITATION FOR THE YEAR……….21.08  DEPARTURE……-3.07
ASOS………….21.58

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

05/01  64/52/58/+5/…./0.0/000/00         46 SSE  AERO 44 SSE RMY N/A
05/02  70/42/56/+3/…./0.0/729/86         41 NW   AERO 40 NW  RMY N/A
05/03  78/55/67/+14/0.00/0.0/613/72        35 SSW  AERO 35 SSW RMY 36
05/04  72/45/59/+5/T/0.0/247/29            37 NW   AERO 40 WNW RMY 39
05/05  60/40/50/-4/0.00/0.0/821/96         31 NW   AERO 32 NW  RMY N/A
05/06  57/38/48/-6/T/0.0/498/58            24 ESE  AERO 22 ENE RMY 22
05/07  63/37/50/-5/0.00/0.0/576/67         30 WSW  AERO 29 WSW RMY N/A
05/08  57/40/49/-6/…./0.0/328/38         31 W    AERO 32 W   RMY N/A
05/09  44/32/38/-17/…./T/484/56          52 W    AERO 53 W   RMY 54
05/10  59/31/45/-10/0.00/0.0/763/88        46 W    AERO 46 W   RMY 49
05/11  65/43/54/-2/0.22/0.0/322/37         39 S    AERO 43 S   RMY 41
05/12  55/37/46/-10/0.00/0.0/801/92        37 W    AERO 37 W   RMY 37
05/13  59/32/46/-10/0.00/0.0/864/99        37 WNW  AERO 37 WNW RMY 38
05/14  70/40/55/-2/0.00/0.0/831/95         29 W    AERO 26 W   RMY 27
05/15  78/50/64/+7/…./0.0/535/61         40 WSW  AERO 40 WSW RMY 43
05/16  69/47/58/+1/…./0.0/730/83         31 NW   AERO 31 NW  RMY 32
05/17  67/47/57/0/0.00/0.0/132/15          22 SSW  AERO N/A    RMY 21
05/18  60/47/54/-4/T/0.0/053/06            24 W    AERO 22 ENE RMY N/A
05/19  56/45/51/-7/0.00/0.0/797/90         35 ENE  AERO 34 ENE RMY 32
05/20  63/43/53/-5/0.00/0.0/869/98         22 ESE  AERO 20 SE  RMY 19
05/21  76/42/59/0/0.00/0.0/862/97          26 S    AERO 25 S   RMY 25
05/22  82/50/66/+7/0.00/0.0/864/97         29 W    AERO 29 W   RMY 28
05/23  67/44/56/-3/0.02/0.0/187/21         42 ENE  AERO 43 ENE RMY 40
05/24  58/43/51/-8/T/0.0/822/92            27 ENE  AERO 24 ENE RMY N/A
05/25  66/46/56/-4/0.00/0.0/072/08         18 ENE  AERO 18 ENE RMY N/A
05/26  82/56/69/+9/0.00/0.0/727/81         21 S    AERO 21 S   RMY 21
05/27  84/59/72/+12/0.00/0.0/728/81        31 SSW  AERO 31 SSW RMY 31
05/28  77/63/70/+9/…./0.0/027/03         33 SSW  AERO 33 S   RMY 33
05/29  78/66/72/+11/…./0.0/072/08        41 SSW  AERO 41 SSW RMY 43
05/30  79/63/71/+10/…./0.0/713/79        30 S    AERO 30 S   RMY N/A
05/31  67/45/56/-5/0.00/0.0/805/89         33 WNW  AERO 33 WNW RMY 32

DAILY RECORDS FOR MAY 2020

5/13/2020: NEW RECORD LOW OF 32F, REPLACING 35F SET IN
1914 AND 2005

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

06/01  64/42/53/-9/T/0.0/…/..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/…./0.0/…/..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/…/..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/…./0.0/…/..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/…./0.0/…/..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/…./0.0/…/..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/…/..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/…/..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/…/..                23 E    AERO 21 E   RMY N/A

06/10 The low since midnight is 59F, the daily normal low is 56F

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

RECORDS FOR JUNE 10
HIGH 98F IN 2008
LOW 42F IN 1913,1920
PRECIP 2.51 INCHES IN 1931
PEAK GUST 60e MPH NW IN 1941

RECORDS FOR JUNE 11
HIGH 92F IN 1973, 1984
LOW 40F IN 1972
PRECIP 2.66 INCHES IN 1922
PEAK GUST 43e MPH S IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner