Tuesday, June 18, 2019

| June 18, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY WITH VERY LIGHT WIND AND INTENSIFYING AFTERNOON
RAINFALL….

We observed foggy conditions with very light rainfall this
morning, only leaving a trace in the gauge by 1 P.M. Rain
became more consistent following noontime. Wind has been
light or calm for most of the day, with a peak gust of
less than 10 mph being seen. The high so far today is 70F,
6 degrees below the daily maximum temperature of 76F. Our low
since midnight was 62F, which is 4 degrees above our normal
minimum temperature for today of 58F.

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: Partial obscuration due to fog
Temperature: 65F; Dew Point: 65F; Wind: Calm
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly
Visibility: 3 miles, fog
6-hr Max temp: 65F
6-hr Min temp: 65F
24-hr Precip: 0.00 ins.
BHO SA 1155 –X E// OVC 3F 155/65/65/0000/999/ WND CALM/ 8//// 53003
10065 20062

10 A.M.
Weather: Broken cumulus, overcast altostratus, very light
rain
Temperature: 69F; Dew Point: 65F; Wind: Calm
Sea-level pressure: 29.99 ins. Hg, rising, then more slowly
Visibility: 25 miles
3-hr Precip: Trace
BHO SA 1455 E50 BKN 110 OVC 25 156/69/65/0000/999/ WND CALM
R-B45 PCPN VRY LGT/ 8/22/ 600// 53001

1 P.M.
Weather: Overcast cumulus, light rain, virga in all directions
Temperature: 67F; Dew Point: 64F; Wind: S at 9 kts
Sea-level pressure: 29.97 ins. Hg, falling, then more slowly
Visibility: 10 miles, fog
6-hr Max temp: 70F
6-hr Min temp: 65F
6-hr Precip: Trace
BHO SA 1755 E30 OVC 10R- 149/67/64/1909/997/ VIRGA ALQDS
R-CTD/ 8/2// 600// 56007 10070 20065

SUMMARY FOR MONDAY, JUNE 17, 2019

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..76
MIN…..62   NORMAL…..58
MEAN….68   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH………………….+6 [+0.2 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……..-29
TOTAL HEATING UNITS FOR THE SEASON………..6250   DEPARTURE…….-113
TOTAL HEATING UNITS LAST SEASON TO DATE……5909   DIFFERENCE……+341

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH…………..27   DEPARTURE……..-17
TOTAL COOLING UNITS FOR THE SEASON………….35   DEPARTURE……..-33
TOTAL COOLING UNITS LAST SEASON TO DATE……..92   DEPARTURE……..-57

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..12 SSE AT  8:48 P.M.
AERO…………………….18 NW  AT  5:10 A.M.
ASOS…………………….18 NW  AT  4:19 A.M.
DAVIS……………………18 WNW AT  4:29 A.M.  RMY 17
FASTEST MILE FOR YESTERDAY………………….13 NW  AT  4:14 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 NW  AT  4:21 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 WNW AT  4:18 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.5 S
ASOS…………………..6.9
DAVIS………………….7.0 S [188 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.37  DEPARTURE…….-0.35
ASOS…………..2.37
TOTAL PRECIPITATION FOR THE YEAR……….28.16  DEPARTURE…….+2.78
ASOS………….28.10

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 70/62/66/0/…./…/..                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/…./…/..               12 SSE AERO 18 NW  RMY 17

06/18 Low temp since midnight is 62F; normal low is 58F

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

RECORDS FOR JUNE 18
HIGH 93F IN 1929,1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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