Thursday, June 1, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 1, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

SUMMERY WEATHER FOR FIRST DAY OF MET. SUMMER

The first day of meteorological summer was met with
weather typical of the season.  Temperatures rose to
78F by 1:00PM which is slightly warmer than average.

Skies cleared through the morning after last evening’s
storm passed through the area and left 0.01 in. of
precip.  Cumulus clouds with moderate vertical develop-
ment were spotted in the afternoon, and distant showers
were noted during the 1:00PM ob.

Wind direction continues to be out of the west after the
change from the south after storm passage.  Wind speeds
have also increased with gusts up to 25 MPH this afternoon.

Visibility reached 70 miles this morning for the first time
in many days.  Distant showers and slightly hazy conditions
limited visibility to 40-60 miles at 1:00PM.

PRELIMINARY STATS FOR MAY 2017

TEMPERATURE, Deg. F
Avg. Max. 63.5 [-2.8] Avg. Min. 47.1 [-0.7] Mean      55.3 [-1.8] 24-hour corrected mean: 54.9
Max. for month: 96F on 18th
Min. for month: 36F on  9th

HEATING DEGREE DAYS
Total heating units: 329 [+61] Total for the season: 5662 [-641] Total for last season: 5248

PRECIPITATION, Inches
Total: 4.53 [+0.42] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 0.0
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 10.6
Avg. corrected wind speed: 11.1
Prevailing wind direction: S at 14%
Peak gust and direction: 46 SSE on 6th

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

Today’s Observations:

7 A.M.
Weather: Few cumulus NNW-N, broken altocumulus
Temperature: 60F; Dew Point: 54F; Wind: SW at 5 kts,
Wind speed: Light
Sea-level pressure: 29.92 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max temp: 60F
6-hr Min temp: 56F
24-hr precip: 0.01 in.
BHO SA 1155 E140 BKN 70 132/60/54/2306/992/ FEW CU NNW-N WND LGT/
8/130 50006 MANUAL 70001 ASOS 70001 10060 20056

10 A.M.
Weather: Few cumulus W-NNE, few altocumulus in all directions
Temperature: 73F; Dew Point: 51F; Wind: W at 8 kts
Sea-level pressure: 29.91 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 127/73/51/2608/991/ FEW CU W-NNE
FEW AC ALQDS/ 8/130 58005

1 P.M.
Weather: Two layers of scattered cumulus
Temperature: 74F; Dew Point: 45F; Wind: W at 10G22 kts
Sea-level pressure: 29.85 ins. Hg, falling, then more quickly
Visibility: 60 miles, except 40 miles W, distant showers SSW-WNW
6-hr Max temp: 78F
6-hr Min temp: 60F
BHO SA 1755 SCT 49 SCT 74 60 110/74/45/2710G22/985/ VSBY W 40
DSNT SHWRS SSW-WNW/ 8/200 58017 10078 20060

SUMMARY FOR WEDNESDAY, MAY 31, 2017

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..71
MIN…..52   NORMAL…..52
MEAN….61   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………-49 [-1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH………….329   DEPARTURE………+61
TOTAL HEATING UNITS FOR THE SEASON………..5662   DEPARTURE……..-641
TOTAL HEATING UNITS LAST SEASON TO DATE……5248   DIFFERENCE…….+414

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28  W  AT 9:21 P.M.
AERO……………………29  W  AT 9:13 P.M.
ASOS……………………30  W  AT 9:20 P.M.
DAVIS…………………..28 WSW AT 9:17 P.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………19  W  AT 9:23 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20  W  AT 9:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20  W  AT 9:19 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.6  S
ASOS…………………..8.6
DAVIS………………….7.0  S  [190 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.53  DEPARTURE……+0.42
ASOS…………..4.67
TOTAL PRECIPITATION FOR THE YEAR……….25.34  DEPARTURE……+2.68
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1  50/43/47/-6/T/034/04                  21 N   AERO 18 N   RMY 22
5/2  65/42/54/+1/0.26/136/16               41 W   AERO 44 W   RMY 43
5/3  52/42/53/0/0.00/595/70                37 WNW*AERO 39 WNW RMY 40
5/4  65/40/53/-1/0.00/724/85               23 S   AERO 23 S   RMY 24
5/5  51/44/48/-6/0.73/000/00               28 E   AERO 28 E   RMY N/A
5/6  65/50/58/+4/0.23/094/11               46 SSE AERO 48 SSE RMY 49
5/7  63/47/55/0/T/670/78                   35 S   AERO 38 S   RMY 39
5/8  54/38/46/-9/T/224/26                  29 WSW AERO 29 WSW RMY 32
5/9  53/36/45/-10/T/251/29                 20 ESE AERO 17 ESE RMY 19
5/10 57/42/50/-5/0.00/225/26               17 NNE AERO 16 NW  RMY N/A
5/11 58/45/52/-4/0.00/443/51               23 NE* AERO 23 NE  RMY 23
5/12 57/41/49/-7/0.01/453/52               21 NE  AERO 20 NE  RMY 19
5/13 57/41/49/-7/0.19/009/01               24 ENE AERO 24 E   RMY N/A
5/14 47/43/45/-12/1.49/000/00              33 NNE AERO 36 N   RMY 36
5/15 58/43/51/-6/0.24/018/02               36 NNW AERO 40 NNW RMY 41
5/16 79/51/65/+8/0.00/870/99               26 WNW AREO 26 WNW RMY 29
5/17 90/60/75/+18/T/775/88                 32 SSE AERO 33 SW* RMY 34
5/18 96/69/83/+25/0.01/830/94              39 WNW AERO 41 WNW RMY 42 TSTM
5/19 89/56/73/+15/T/814/92                 35 W   AERO 33 W   RMY 37
5/20 67/49/58/0/0.00/709/80                23 NE  AERO 22 NE  RMY 21
5/21 66/45/56/-3/0.00/773/87               21 E   AERO 20 S   RMY 21
5/22 53/48/51/-8/0.18/000/00               22 S   AERO 22 S   RMY 23
5/23 70/51/61/+2/0.01/366/41               21 NNW AERO 18 NNW RMY 19
5/24 65/53/59/0/0.00/116/13                17 E   AERO 16 E   RMY N/A
5/25 53/49/51/-9/0.66/000/00               36 E   AERO 38 E   RMY N/A TSTM
5/26 56/46/51/-9/0.44/…/..               35 N   AERO 37 N   RMY N/A
5/27 67/51/59/6/0.00/…/..                18 SE  AERO 18 SE  RMY 19
5/28 71/51/61/0/T/…/..                   18 SSW*AERO 18 SSW RMY 18
5/29 51/46/49/-12/0.07/…/..              21 E   AERO 20 ENE*RMY 20
5/30 61/46/54/-7/0.00/000/00               20 S   AERO 22 S   RMY 21
5/31 70/52/61/0/0.01/…/..                28 W   AERO 29 W   RMY 29

PRELIMINARY CLIMATE SUMMARY FOR MAY 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 Low temp since midnight is 55F; normal low is now 53F

DAILY RECORDS FOR MAY

5/17/17: DAILY RECORD MAXIMUM TEMPERATURE OF 90F,
BREAKS PREVIOUS RECORD OF 88F SET IN 1974
AND TIED IN 1977

5/17/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 60F,
TIES PREVIOUS RECORD SET IN 1932

5/18/17: DAILY RECORD MAXIMUM TEMPERATURE OF 96F,
BREAKS PREVIOUS RECORD OF 88F SET IN 1906
AND TIED IN 1936 AND 1986;
BREAKS PREVIOUS MONTHLY RECORD OF 94F SET ON
MAY 26, 2010

5/18/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
BREAKS PREVIOUS RECORD OF 61F SET IN 1943

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

RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month] PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle