Sunday, June 16, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 16, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY WITH VERY LIGHT RAINFALL WITH
INCREASING FOG IN THE DISTANCE….

Rain this morning left 0.03 inches in the gauge by the 7 A.M.
observation. Skies remained overcast, and very light rainfall
left only a trace so far. Visibility has been limited by fog,
being brought down to 20 miles by 10 A.M. The high so far today
is 70F, five degrees below the daily normal maximum of 75F, and
the low since midnight is 54F, three degrees below the daily
normal minimum of 57F.

Partial middle and high level clouds earlier this morning
drifted away to leave a mostly sunny sky by early afternoon.
The visibility has been very good near 70 miles all day
with some light distant haze partly obscuring the most distant
mountains. The air has dried from the rain on Thursday with
the dew point holding in the upper 40s today and the relative
humidity dropping to near 30%. The wind has picked up since
sunrise with a peak gust to 29 kts, 33 mph, from the SSW at
14:33 PM EST. The high so far today is 79F, four degrees above
the daily normal maximum of 75F, and the low since midnight
is 54F, three degrees below the daily normal minimum of 57F.

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 [+0.50] Greatest in 24 hrs: 1.24 ins. on the 13th-14th

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: 10362 minutes of possible 26226 or 40%
Astronomical total minutes:   10733 minutes of possible 27166 or 40%

Today’s Observations:

7 A.M.
Weather: Overcast altostratus
Temperature: 64F; Dew Point: 62F; Wind: SW at 10 kts
Sea-level pressure: 29.91 ins. Hg, falling then rising
Visibility: 40 miles, distant fog
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr Precip: 0.03 ins.
BHO SA 1155 E65 OVC 40 130/64/62/2210/991/ DSNT FG ALQDS/
8/01/ 70003 50001 10066 20061

10 A.M.
Weather: Very light rain, overcast nimbostratus,
few stratus fractus
Temperature: 67F; Dew Point: 61F; Wind: SSW at 8 kts
Sea-level pressure: 29.89 ins. Hg, falling steadily
Visibility: 20 miles, distant fog
3-hr Precip: Trace
BHO SA 1455 E65 OVC 20R- 124/67/61/2008/989/ FEW STFA DSNT
FG ALQDS R-CTD PCPN VRY LGT/ 8/72/ 600// 55006

1 P.M.
Weather: Very light rain, overcast nimbostratus,
few stratus fractus
Temperature: 69F; Dew Point: 63F; Wind: SW at 7 kts
Sea-level pressure: 29.86 ins. Hg, falling steadily
Visibility: 20 miles, distant fog
6-hr Max temp: 70F
6-hr Min temp: 64F
6-hr Precip: Trace
BHO SA 1755 E65 OVC 20R- 117/69/63/2207/986/ FEW STFA DSNT
FG ALQDS R-CTD PCPN VRY LGT/ 8/72/ 600// 58007 10070 20064

SUMMARY FOR SATURDAY, JUNE 15, 2019

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..75
MIN…..54   NORMAL…..57
MEAN….67   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH………………….+5 [+0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..31   DEPARTURE……..-25
TOTAL HEATING UNITS FOR THE SEASON………..6250   DEPARTURE…….-109
TOTAL HEATING UNITS LAST SEASON TO DATE……5909   DIFFERENCE……+341

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH…………..23   DEPARTURE……..-14
TOTAL COOLING UNITS FOR THE SEASON………….31   DEPARTURE……..-30
TOTAL COOLING UNITS LAST SEASON TO DATE……..78   DEPARTURE……..-47

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..38 SSW AT  6:23 P.M.
AERO…………………….41 SSW AT  5:10 P.M.
ASOS…………………….40 SSW AT  6:23 P.M.
DAVIS……………………44 S   AT  3:43 P.M.  RMY 40
FASTEST MILE FOR YESTERDAY………………….30 SSW AT  3:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….29 SSW AT  6:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………31 S   AT  3:43 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.2 SSW
ASOS…………………..17.2
DAVIS………………….16.7 SSW [211 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03  DEPARTURE…….-0.12
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….2.27  DEPARTURE…….-0.16
ASOS…………..2.29
TOTAL PRECIPITATION FOR THE YEAR……….28.06  DEPARTURE…….+2.97
ASOS………….28.02

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/-4/0.00/0.0/025/03           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/000/00          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/0.07/0.0/000/00           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/0.05/0.0/000/00           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.04/0.0/000/00           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/0.02/0.0/505/59           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/566/66           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/758/88           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/492/57           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/043/05           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/0.00/0.0/763/88           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.71/T/000/00            30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/0.91/0.0/113/13          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/0.34/0.0/000/00          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/0.00/0.0/587/67           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/0.00/0.0/615/70            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/0.07/0.0/062/07            22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/0.00/0.0/811/92           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/0.13/0.0/345/39           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/0.36/0.0/408/46           35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/0.0/843/95           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/0.0/862/97            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/0.25/0.0/080/09           36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/0.02/0.0/000/00           47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/0.14/0.0/617/69           M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/0.23/0.0/645/72           40 W   AERO 38 W    RMY 39
05/27 76/57/67/+7/0.00/0.0/798/89           30 NE  AERO 22 NE   RMY 27
05/28 57/48/53/-8/0.31/0.0/009/01           26 E   AERO 22 ESE  RMY 25
05/29 51/45/48/-13/0.04/0.0/000/00          21 NNW AERO 21 NNW  RMY N/A
05/30 63/46/55/-6/0.36/0.0/000/00           23 S   AERO 23 S    RMY 25
05/31 72/54/63/2/0.26/0.0/786/87            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/+6/…./…/..               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 78/55/67/+3/0.00/…/..               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/…./…/..               26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/…./…/..               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/…./…/..               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/…./…/..              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/…/..               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/…/..               38 SSW AERO 41 SSW RMY 40

06/16 Low temp since midnight is 61F; normal low is 57F

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

RECORDS FOR JUNE 16
HIGH 92F IN 1891, 1967
LOW 44F IN 1926
PRECIP 2.17 INS IN 1931
PEAK GUST 55 MPH W IN 1958

RECORDS FOR JUNE 17
HIGH 93F IN 1894
LOW 44F IN 1920
PRECIP 2.79 INS 2001 (Sub-Tropical storm ALLISON)
PEAK GUST 55e MPH S IN 1977

TODAY’S REPORT PREPARED BY: Benjamin Turner