Wednesday, June 12, 2019

| June 12, 2019 | 2 Replies

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR WEATHER DAY WITH LIGHT WINDS AND
GOOD VISIBILITY….

Today was a fair weather day with a cool,
springlike morning. Visibility was excellent
at 85 miles, and wind was light. A wind shift
from NW-S was observed around noontime. It was
sunny despite the sky being almost fully covered
by cirrostratus or altostratus clouds. The high
so far today is 74F, the same as the daily normal.
The low since midnight is 52F, 4 degrees below the
daily normal minimum of 56F.

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: 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: Broken cirrus
Temperature: 60F; Dew Point: 49F; Wind: NW at 9G14 kts
Sea-level pressure: 30.18 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 52F
24-hr Precip: 0.19 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E250 BKN 80 221/60/49/3209G14/018/ 8/002
70019 52025 10062 20052

10 A.M.
Weather: Overcast cirrostratus
Temperature: 68F; Dew Point: 43F; Wind: NW at 5 kts,
Wind: Light
Sea-level pressure: 30.19 ins. Hg, rising, then steady
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 85 225/68/43/3305/019/ WND LGT/
8/008 51004

1 P.M.
Weather: Broken altostratus
Temperature: 72F; Dew Point: 43F; Wind: S at 5 kts,
Wind: Light
Sea-level pressure: 30.18 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 74F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins.
BHO SA 1755 E110 BKN 80 220/72/43/1705/018/ WND LGT/
8/010 58005 10074 20061

SUMMARY FOR TUESDAY, JUNE 11, 2019

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..74
MIN…..58   NORMAL…..56
MEAN….66   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………+23 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH…………..13   DEPARTURE……..-30
TOTAL HEATING UNITS FOR THE SEASON………..6232   DEPARTURE…….-114
TOTAL HEATING UNITS LAST SEASON TO DATE……5903   DIFFERENCE……+329

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..21   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE SEASON………….29   DEPARTURE……..-19
TOTAL COOLING UNITS LAST SEASON TO DATE……..74   DEPARTURE……..-45

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32  NW  AT  6:33 P.M.
AERO…………………….30  NW  AT  2:38 P.M.
ASOS…………………….35  NW  AT  6:33 P.M.
DAVIS……………………33  W   AT  2:31 P.M.  RMY 35
FASTEST MILE FOR YESTERDAY………………….23  NW  AT  6:48 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23  NW  AT  6:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23  NW  AT  2:29 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..13.7 NW
ASOS……………………..12.4
DAVIS…………………….13.7 NW [253 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.19  DEPARTURE…….+0.03
ASOS…………..0.19
TOTAL PRECIPITATION FOR THE MONTH……….1.43  DEPARTURE…….-0.38
ASOS…………..1.43
TOTAL PRECIPITATION FOR THE YEAR……….27.22  DEPARTURE…….+2.75
ASOS………….27.16

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/…./0.0/…/..           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/…./0.0/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./0.0/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./0.0/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./0.0/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./0.0/…/..    22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./0.0/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./0.0/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./0.0/…/..    35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/0.0/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/0.0/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…./0.0/…/..    36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…./0.0/…/..    47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/…./0.0/…/..    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/+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 Low temp since midnight is 52F; normal low is 56F

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

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

RECORDS FOR JUNE 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month]
PEAK GUST 69 MPH N IN 1956

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

Comments (2)

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  1. Douglas Webster says:

    When is the May sunshine data going to be available?

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