Saturday, June 2, 2018

| June 3, 2018 |

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 2, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND HUMID TODAY WITH A FEW RAIN SHOWERS AROUND

The humid conditions of yesterday lingered into today, with the dew point
at 70F this morning. A morning wind shift to northeasterly, off the ocean,
has kept the heat and humidity somewhat in check. The temperature has slowly
risen to a high so far of 79F, with the dew point easing back into the
mid 60s. Skies have been mostly cloudy today, with clouds observed at
several levels, including some towering cumulus. A few rain showers have
popped up across the area, and have been visible from the Observatory, with
one shower briefly impacting the summit with just a trace of rainfall after
2PM. Visibility has been a hazy 35-40 miles throughout the day.

May ended drier and warmer than average. The mean temperature for the month
was 61.8F which is 4.7 degrees above monthly normal of 57.1F. The 24-hour
corrected mean temperature of 61.0F ties May 2018 for the third warmest May
on record at Blue Hill. We measured 2.00 ins. of rainfall for the month,
which is 2.11 ins. below the monthly normal of 4.11 ins.

PRELIMINARY STATS FOR MAY 2018

TEMPERATURE, Deg. F
Avg. Max. 72.2 [+5.9]
Avg. Min. 51.3 [+3.5]
Mean      61.8 [+4.7]
24-hour corrected mean: 61.0
Max. for month: 90F on 3rd
Min. for month: 39F on 1st

HEATING DEGREE DAYS
Total heating units:   154 [-114]
Total for the season:  5847 [-456]
Total for last season: 5662

COOLING DEGREE DAYS
Total cooling units:   62 [+40]
Total for the season:  62 [+38]
Total for last season: 56

PRECIPITATION, Inches
Total: 2.00 ins. [-2.11]
Greatest in 24 hrs: 0.74 ins. on 15th

SNOWFALL, Inches
Total: 0.0 ins. [-0.0]

WIND, mph
Avg. uncorrected wind speed: 10.3
Avg. corrected wind speed: 10.8
Prevailing wind direction: SSW at 14%
Peak gust and direction: 51 NW on 15th

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

BHO Warmest May Mean Temperature (24-hour adjusted mean), deg F (1885-2018):

1) 61.5 in 2015
2) 61.4 in 1991
3) 61.0 in 1944
61.0 in 2018
5) 60.9 in 2010
6) 59.4 in 1911
59.4 in 1959
8) 59.3 in 1964
59.3 in 2012

Today’s Observations:

7 A.M.
Weather: Broken altocumulus (two layers), few stratus fractus
distant ESE-SE, few altocumulus castellanus SW-W
Temperature: 72F; Dew Point: 70F; Wind: NNW at 7 kts
Sea-level pressure: 29.72 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant haze
6-hr Max temp: 72F
6-hr Min temp: 68F
24-hr Precip: Trace
BHO SA 1155 E120 BKN 150 BKN 40 064/72/70/3407/972/ FEW STFRA DSNT ESE-SE
FEW ACC SW-W DSNT HZ/ 8/68/ 53010 MANUAL 7000/ 10072 20068

10 A.M.
Weather: Scattered cumulus and stratocumulus, broken cumulus and moderate
cumulus, rain shower WSW moving S
Temperature: 76F; Dew Point: 66F; Wind: ENE at 14G22 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 29.77 ins. Hg, rising, then more rapidly
Visibility: 35 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 20 SCT E50 BKN 150 BKN 35 081/76/66/0614G22/977/
SHRA WSW MVG S DSNT HZ WND 03V10/ 8/83/ 53017

1 P.M.
Weather: Scattered cumulus, broken cumulus and moderate cumulus, few
towering cumulus N-NE, rain shower NNW moving S
Temperature: 79F; Dew Point: 66F; Wind: ENE at 11 kts
Sea-level pressure: 29.76 ins. Hg, rising then falling
Visibility: 40 miles, distant haze
6-hr Max temp: 79F
6-hr Min temp: 72F
6-hr precip: 0.00 ins.
BHO SA 1755 30 SCT E60 BKN 40 079/79/66/0711/976/ FEW TCU N-NE
SHRA NNW MVG S DSNT HZ/ 8/2// 58002 10079 20072

SUMMARY FOR FRIDAY, JUNE 1, 2018

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..71
MIN…..62   NORMAL…..53
MEAN….70   NORMAL…..62

DEPARTURE FROM 30-YEAR NORMAL…………………..+8
TOTAL DEPARTURE FOR THE MONTH…………………..+8 [+8.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..0   DEPARTURE………..-5
TOTAL HEATING UNITS FOR THE MONTH…………..0   DEPARTURE………..-5
TOTAL HEATING UNITS FOR THE SEASON……….5847   DEPARTURE………-461
TOTAL HEATING UNITS LAST SEASON TO DATE…..5662   DIFFERENCE……..+185

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE MONTH……………5   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE SEASON………….67   DEPARTURE………+41
TOTAL COOLING UNITS LAST SEASON TO DATE……..58   DEPARTURE……….+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 S  AT 2:18 A.M.*
AERO…………………….21 S  AT 2:18 A.M.
ASOS…………………….21 S  AT 1:39 A.M.
DAVIS……………………21 M  AT 2:21 A.M.** RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 S  AT 2:18 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 S  AT 2:18 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 M  AT 2:18 A.M.**
AVERAGE WIND SPEED AND DIRECTION……………8.3 SSW
ASOS……………………8.5
DAVIS…………………..8.7
* Last of several occurrences
** Davis direction malfunctioning

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……….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….27.31  DEPARTURE……+4.66
ASOS………….28.87

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

5/01 65/39/52/-1/0.00/0.0/625/74    25 WNW AERO 21 WNW RMY 25
5/02 88/59/74/+21/0.00/0.0/584/69   37 WSW AERO 29 WSW RMY 35
5/03 90/67/79/+26/0.13/0.0/433/51   36 SW  AERO 32 WSW RMY 36
5/04 84/67/74/+20/0.05/0.0/102/12   39 SSW AERO 37 SSW RMY N/A
5/05 73/54/64/+10/0.00/0.0/615/72   56 W   AERO 55 W   RMY N/A
5/06 65/48/57/+3/0.21/0.0/000/00    24 NE  AERO 18 NE  RMY 21
5/07 62/49/56/+1/0.00/0.0/713/83    26 ENE AERO 22 NE  RMY 24
5/08 73/46/60/+5/0.00/0.0/852/99    25 SSE AERO 21 ESE RMY 23
5/09 74/48/61/+6/0.00/0.0/768/89    23 ESE AERO 18 ESE RMY 21
5/10 73/48/61/+6/0.03/0.0/355/41    33 S   AERO 30 S   RMY 32
5/11 70/51/61/+5/0.00/0.0/703/81    26 WNW AERO 24 NW  RMY 28
5/12 51/47/49/-7/0.19/0.0/000/00    25 E   AERO 23 E   RMY N/A
5/13 58/46/52/-4/T/0.0/392/45       20 S   AERO 17 S   RMY 16
5/14 73/47/60/+3/T/0.0/551/63       23 S   AERO 18 S   RMY 21
5/15 83/54/69/+12/0.74/0.0/333/38   51 NW  AERO 50 NW  RMY 54 TSTM
5/16 56/49/53/-4/T/0.0/272/31       32 ENE AERO 28 ENE RMY 30
5/17 72/51/62/+5/0.02/0.0/000/00    17 SW  AERO 14 SW  RMY N/A
5/18 62/43/53/-5/0.00/0.0/467/53    35 ENE AERO 33 ENE RMY N/A
5/19 57/43/50/-8/…/0.0/133/15     22 E   AERO 17 E   RMY N/A
5/20 77/54/66/+8/…/0.0/000/00     33 SW  AERO 31 SW  RMY 33 TSTM
5/21 75/52/64/+5/0.00/0.0/861/97    22 W   AERO 18 W   RMY 20
5/22 68/51/60/+1/0.04/0.0/071/08    23 SSW AERO 21 S   RMY 22
5/23 82/51/67/+8/0.06/0.0/…/..    33 NNW AERO 33 NNW RMY 34 TSTM
5/24 74/50/62/+3/0.00/0.0/…/..    28 SSW AERO 25 SSW RMY 27
5/25 86/50/68/+8/0.00/0.0/…/..    40 W   AERO 39 W   RMY 43
5/26 88/61/75/+15/…./0.0/…/..   38 ENE AERO 38 ENE RMY 39
5/27 61/47/54/-6/…./0.0/…/..    32 ENE AERO 30 ENE RMY N/A
5/28 60/48/54/-7/…./0.0/…/..    23 S   AERO 21 S   RMY N/A
5/29 85/56/71/+10/0.00/0.0/…/..   23 WSW AERO 23 WSW RMY N/A
5/30 72/59/66/+5/0.00/0.0/…/..    21 S   AERO 20 S   RMY 21
5/31 81/54/68/+7/0.00/0.0/…/..    28 S   AERO 28 S   RMY 29

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

6/1 78/62/70/+8/T/…/..            21 S   AERO 21 S   RMY N/A

6/2 Low temp since midnight is 68F; normal low is now 53F

DAILY RECORDS FOR MAY 2018

5/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001

5/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 66F SET IN 2001

DAILY RECORDS FOR JUNE 2018

None so far.

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

RECORDS FOR JUNE 2
HIGH 91F IN 1895
LOW 41F IN 1907, 1929
PRECIP 2.36 INS IN 1982
SNOWFALL TRACE IN 1907 (IP)
PEAK GUST 63 MPH NW IN 2000

RECORDS FOR JUNE 3
HIGH 98F IN 1919
LOW 38F IN 1929
PRECIP 2.40 INS 2006
PEAK GUST 47 MPH NW IN 1998

TODAY’S REPORT PREPARED BY: Jonathan O’Brien

 

Category: Daily Discussions

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