Sunday, June 9, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM WITH LIGHT SOUTHERLY WINDS AND
GOOD VISIBILITY ATOP GREAT BLUE HILL….

Despite a distant haze, visibility was more
than 65 miles on average. Conditions continue
to be dry with negligible cloud cover, reaching
a low relative humidity of 30% at the 1 P.M.
observation. Light warm air advection from the
south and a mostly clear sky has brought today’s
temperatures above seasonal averages. The high so
far today is 77F, 4 degrees above the normal of 73F.
The low since midnight is 55F, the same as the
daily normal minimum of 55F.

PRELIMINARY STATS FOR MAY 2019

TEMPERATURE, Deg. F
Avg. Max. 63.5 [-2.8] Avg. Min. 46.0 [-1.8] Mean      54.8 [-2.2] 24-hour corrected mean: 54.4
Max. for month: 85F on the 26th
Min. for month: 36F on the 12th

HEATING DEGREE DAYS
Total heating units:    318 [+50] Total for the season:  6219 [-84] Total for last season: 5847

COOLING DEGREE DAYS
Total cooling units:   8 [-14] Total for the season:  8 [-16] Total for last season: 62

PRECIPITATION, Inches
Total: 4.61 [-0.02] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: Trace [+/-0.0] Greatest in 24 hrs: Trace [12th]

WIND, mph
Avg. uncorrected wind speed: 10.5
Avg. corrected wind speed: 11.1
Prevailing wind direction: S at 13%
Peak gust and direction: 47 NW on 24th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus
Temperature: 62F; Dew Point: 43F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 30.35 ins. Hg, rising steadily
Visibility: 70 miles, distant smoke layer
6-hr Max temp: 62F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 250 SCT 70 277/62/43/2506/035/ THN K LYR
ALQDS WND LGT/ 8/002 52013 10062 20055

10 A.M.
Weather: Scattered cirrus
Temperature: 73F; Dew Point: 45F; Wind: S at 8G16 kts
Sea-level pressure: 30.37 ins. Hg, steady, then rising
Visibility: 50 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 50 282/73/45/1708G16/037/ DSNT
HZ ALQDS/ 8/002 51005

1 P.M.
Weather: Scattered cirrus
Temperature: 77F; Dew Point: 43F; Wind: SSW at 9G16 kts
Sea-level pressure: 30.33 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 70 272/77/43/2009G16/033/
8/002 58010 10077 20062

SUMMARY FOR SATURDAY, JUNE 8, 2019

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..73
MIN…..57   NORMAL…..55
MEAN….68   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL………………….+4
TOTAL DEPARTURE FOR THE MONTH…………………+18 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-4
TOTAL HEATING UNITS FOR THE MONTH…………..13   DEPARTURE……..-20
TOTAL HEATING UNITS FOR THE SEASON………..6232   DEPARTURE…….-104
TOTAL HEATING UNITS LAST SEASON TO DATE……5897   DIFFERENCE……+335

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH…………..16   DEPARTURE……….0
TOTAL COOLING UNITS FOR THE SEASON………….24   DEPARTURE……..-16
TOTAL COOLING UNITS LAST SEASON TO DATE……..70   DEPARTURE……..-46

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 ENE AT  8:20 A.M.
AERO…………………….21 SW  AT 11:40 P.M.
ASOS…………………….24 E   AT  8:21 A.M.
DAVIS……………………23 ENE AT  8:20 A.M.  RMY 21
FASTEST MILE FOR YESTERDAY………………….16 SSW AT 11:15 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 SW  AT 11:06 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 ENE AT  8:22 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….10.3 S
ASOS…………………….10.4
DAVIS……………………10.2 ESE [116 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.13  DEPARTURE…….-1.20
ASOS…………..0.13
TOTAL PRECIPITATION FOR THE YEAR……….26.02  DEPARTURE…….+2.03
ASOS………….25.86

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 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./0.0/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./0.0/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/T/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..    22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..    35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…./…/…/..    36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…./…/…/..    47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/…./…/…/..     M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/…./0.0/…/..           40 W   AERO 38 W    RMY 39
05/27 76/57/67/+7/…./0.0/…/..           30 NE  AERO 22 NE   RMY 27
05/28 57/48/53/-8/…./0.0/…/..           26 E   AERO 22 ESE  RMY 25
05/29 51/45/48/-13/…./0.0/…/..          21 NNW AERO 21 NNW  RMY N/A
05/30 63/46/55/-6/…./0.0/…/..     23 S   AERO 23 S    RMY 25
05/31 72/54/63/2/…./0.0/…/..     28 N   AERO 23 N    RMY 26

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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 71/54/63/+1/0.00/…/..               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/…./…/..               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/…./…/..               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/…/..               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/…./…/..               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+7/…./…/..     28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/…/..               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/…/..               23 ENE AERO 21 SW  RMY 21

06/09 Low temp since midnight is 55F; normal low is 55F

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

RECORDS FOR JUNE 9
HIGH 94F IN 2008
LOW 40F IN 1980
PRECIP 2.08 INCHES IN 1931
PEAK GUST 67 MPH NW IN 1973

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

TODAY’S REPORT PREPARED BY: Benjamin Turner