Sunday, June 4, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 4, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY AND DRY MORNING, OVERCAST SKIES BY 1:00PM EST

Temperatures fell to a low of 49F at 4:30AM this
morning and had quickly risen to 59F by 7:00AM.
Morning skies cleared to partly cloudy with scattered
cumulus and scattered cirrus, but heating slowed as
skies became overcast with cirrostratus by 1:00PM.
With precip. anticipated to arrive later in the evening,
dew points remained near 50F, and visibility was great
at 70 miles.  Light winds continued today with directions
varying from west-northwest through southwest.

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: 1.67 in. on 13th-14th

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: 9,564 minutes of possible 26,226 or 36%
Astronomical total minutes: 9,911 minutes of possible 27,196 or 36%

Today’s Observations:

7 A.M.
Weather: Broken cirrus
Temperature: 59F; Dew Point: 49F; Wind: WNW at 7 kts
Sea-level pressure: 29.99 ins. Hg, steady then rising
Visibility: 70 miles
6-hr Max temp: 59F
6-hr Min temp: 49F
24-hr precip: 0.01 in.
BHO SA 1155 E250 BKN 70 156/59/49/3007/999/ 8/001 53003
MANUAL 70001 ASOS 70001 10059 20049

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 67F; Dew Point: 48F; Wind: W at 7 kts,
Wind direction: variable WSW to NW
Sea-level pressure: 29.98 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 39 SCT 250 SCT 70 153/67/48/2807/998/ WND 24V31/ 8/101 58003

1 P.M.
Weather: Scattered cumulus, overcast cirrostratus
Temperature: 69F; Dew Point: 47F; Wind: SW at 6 kts,
Wind speed: Light
Sea-level pressure: 29.93 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 71F
6-hr Min temp: 59F
BHO SA 1755 49 SCT E250 OVC 70 136/69/47/2306/993/ WND LGT/
8/107 58017 10071 20059

SUMMARY FOR SATURDAY, JUNE 3, 2017

TEMPERATURE (DEGREES F)
MAX…..66   NORMAL…..71
MIN…..47   NORMAL…..53
MEAN….57   NORMAL…..62

DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………….-2 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………8   DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE MONTH…………..13   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE SEASON………..5675   DEPARTURE……..-642
TOTAL HEATING UNITS LAST SEASON TO DATE……5255   DIFFERENCE…….+420

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH……………2   DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE SEASON………….58   DEPARTURE………+29
TOTAL COOLING UNITS LAST SEASON TO DATE……..48   DIFFERENCE……..+10

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NW  AT 10:11 P.M.
AERO……………………25 NW  AT 10:11 P.M.
ASOS……………………24 NNW AT 10:11 P.M.
DAVIS…………………..23 NW  AT 10:11 P.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………16 NW  AT  2:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 WNW AT  2:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 NW  AT  2:26 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.3 NW
ASOS…………………..9.5
DAVIS………………….7.8 WNW [300 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.15
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.07  DEPARTURE……-0.42
ASOS…………..0.08
TOTAL PRECIPITATION FOR THE YEAR……….25.41  DEPARTURE……+2.26
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/-9/0.44/000/00               35 N   AERO 37 N   RMY N/A
5/27 67/51/59/6/0.00/449/50                18 SE  AERO 18 SE  RMY 19
5/28 71/51/61/0/T/333/37                   18 SSW*AERO 18 SSW RMY 18
5/29 51/46/49/-12/0.07/000/00              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 70/52/61/0/0.01/000/00                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  78/55/67/+5/0.06/…/..               39 NW  AERO 39 NW  RMY 41
6/2  70/50/60/-2/0.00/…/..               32 WNW AERO 35 WNW RMY 34
6/3  66/47/57/-5/0.01/…/..               23 NW  AERO 25 NW  RMY 24

6/4 Low temp since midnight is 49F; normal low is now 54F

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 4
HIGH 99F IN 1919 [Record for month] LOW 41F IN 1915,1926
PRECIP 1.52 INS IN 2007
PEAK GUST 48 MPH SSE IN 1983

RECORDS FOR JUNE 5
HIGH 95F IN 1930
LOW 41F IN 1891
PRECIP 2.83 INS IN 1982
PEAK GUST 57 MPH NNW IN 1988

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle