Thursday, June 11, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY WITH SOME DECENT RAIN SHOWERS IN THE
AFTERNOON….

Visibility was 15 miles at maximum today, with
a distant fog. Rain moved in around noontime,
leaving 0.22 inches in the gauge by the 1 P.M.
observation. This was accompanied by a couple
rumbles of thunder coming from the north. Wind
has been strong from the south, with a max gust
of 40 mph seen today.

The high so far today is 71 degrees, this is 3
degrees below the daily normal high of 74F. The
low since midnight is 65F, which is 9 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 stratus fractus, broken altostratus and
cirrostratus
Temperature: 69F; Dew Point: 64F; Relative Humidity: 85%
Wind: S at 18G29 kts, peak wind of 37 MPH at 6:26 A.M.
Sea-level pressure: 30.01 ins. Hg: rising, then falling
Visibility: 15 miles, fog
6-hr Max temp: 69F
6-hr Min temp: 56F
24-hr Precip:  Trace
24-hr Snowfall: 0.0 ins.
BHO SA 1155 25 SCT E180 BKN 250 BKN 15 164/69/64/1918G29/001/
DSNT FG ALQDS PK WND 1932/26/ 8/628 56004 10069 20056

10 A.M.
Weather: Overcast stratus
Temperature: 69F; Dew Point: 64F; Relative Humidity: 83%
Wind: S at 13G34 kts, peak wind of 39 MPH at 9:56 A.M.
Sea-level pressure: 30.03 ins. Hg: falling, then rising
Visibility: 15 miles, distant fog
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 20 OVC 15 170/69/64/1913G34/003/ DSNT FG ALQDS
PK WND 1934/56/ 8/6// 53006

1 P.M.
Weather: Overcast stratus, rain with thunder
Temperature: 67F; Dew Point: 67F; Relative Humidity: 100%
Wind: S at 13G22 kts, peak wind of 35 MPH at 12:58 P.M.
Sea-level pressure: 30.04 ins. Hg: rising steadily
Visibility: 5 miles, fog
6-hr Max temp: 71F
6-hr Min temp: 69F
6-hr Precip:  0.22 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 20 OVC 5RF 173/67/67/1913G31/004/ RCTD TE30 PK
WND 1931/58/ 8/6// 6022/ 53004 10071 20069

SUMMARY FOR WEDNESDAY, JUNE 10, 2020

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..73
MIN…..58   NORMAL…..56
MEAN….64   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL……………..-1
TOTAL DEPARTURE FOR THE MONTH…………….+25 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 1  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH……………24  DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE SEASON…………5836  DEPARTURE……-507
TOTAL HEATING UNITS LAST SEASON TO DATE…….6234  DEPARTURE……-398

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 0  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH……………31  DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE SEASON…………..63  DEPARTURE…….+18
TOTAL COOLING UNITS LAST SEASON TO DATE………28  DEPARTURE…….+35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 E   AT  2:30 A.M.
AERO…………………….24 E   AT  2:35 A.M.
ASOS…………………….25 E   AT  2:30 A.M.
DAVIS……………………25 E   AT  2:21 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 E   AT  5:02 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 ENE AT  5:00 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 E   AT 12:37 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.2 E
ASOS…………………..11.5
DAVIS………………….11.7 E [82 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……-0.36
ASOS…………..1.27
TOTAL PRECIPITATION FOR THE YEAR……….21.08  DEPARTURE……-3.23
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

06/11  The low since midnight is 65F, 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 11
HIGH 92F IN 1973, 1984
LOW 40F IN 1972
PRECIP 2.66 INCHES IN 1922
PEAK GUST 43e MPH S IN 1945

RECORDS FOR JUNE 12
HIGH 94F IN 2017
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991

TODAY’S REPORT PREPARED BY: Benjamin Turner