Tuesday, June 5, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 5, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER BELOW SEASONABLE, OVERCAST,
AND WET DAY ON GREAT BLUE HILL…

With wind and rain coming from the E/ENE yesterday, we
had near record breaking below seasonable temperatures
with the high temperature of 52F. This is 20F degrees
lower than the daily normal at 72F and only 2 degrees
above the record low max of 50F set back in 2012.
Rainfall began yesterday morning and continued throughout
the day and ended around 6:00 P.M. We measured a storm
total of 0.82 inches of rainfall.
Today the humidity was high at the 7:00 A.M. observation at
100%, resulting in foggy conditions with visibility only
reaching a half mile. By the 10:00 A.M. observation the sky
cleared for a short bit, the fog slightly dissipated,
allowing for a hazy 40 miles of visibility. Rain showers
have been intermittent throughout the day, and we measured
0.01 inches of precipitation by the 1:00 P.M. observation.
Thunder and heavier rain began this afternoon around 2:30 P.M.

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: 2.01 ins. [-2.10] 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: 56 W on 5th

SUNSHINE:
Campbell-Stokes card minutes: 13326 minutes of possible 26226 or 51%
Astronomical total minutes: 13831 minutes of possible 27178 or 51%

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: Very light drizzle and fog, overcast nimbostratus
Temperature: 49F; Dew Point: 49F; Wind: SW at 6 kts
Wind: Light
Sea-level pressure: 29.71 ins. Hg, rising, then falling
Visibility: 1/2 miles
6-hr Max temp: 49F
6-hr Min temp: 47F
24-hr Precip: 0.69 ins.
BHO SA 1155 E4 OVC 1/2L-F 062/49/49/2106/971/PCPN
VRY LGT WND LGT/ 8/02/ 51008 MANUAL 70069 ASOS 70079
10049 20047

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus,
Temperature: 59F; Dew Point: 50F; Wind: ENE at 5 kts
Wind: Light
Sea-level pressure: 29.85 ins. Hg, falling, then more rapidly
Visibility: 40 miles, distant haze in all directions
3-hr Precip: Trace
BHO SA 1455 26 SCT 90 SCT 40 053/59/50/0705/DSNT HZ ALQDS
WND LGT/ 8/509 58009 MANUAL 600//

1 P.M.
Weather: Very light drizzle, scattered stratus fractus,
broken stratocumulus/cumulus, overcast nimbostratus
Temperature: 60F; Dew Point: 56F; Wind: NNE at 5 kts
Wind: Light
Sea-level pressure: 29.63 ins. Hg, falling then more rapidly
Visibility: 40 miles, except 10 mile NNW-NNE, distant fog in
all directions
6-hr Max temp: 64F
6-hr Min temp: 49F
6-hr precip: 0.01 ins.
BHO SA 1755 26 SCT E40 BKN E50 OVC 40L- 037/60/56/0305/963/
PCPN VRY LGT VSBY NNW-NNE 10 DSNT FG ALQDS WND LGT/ 8/82/
58016 MANUAL 60001/ 10064 20049

SUMMARY FOR MONDAY, JUNE 4, 2018

TEMPERATURE (DEGREES F)
MAX…..52   NORMAL…..72
MIN…..45   NORMAL…..54
MEAN….49   NORMAL…..63

DEPARTURE FROM 30-YEAR NORMAL……………………-14
TOTAL DEPARTURE FOR THE MONTH……………………-11 [-3.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….16   DEPARTURE……….+12
TOTAL HEATING UNITS FOR THE MONTH………….29   DEPARTURE……….+11
TOTAL HEATING UNITS FOR THE SEASON……….5876   DEPARTURE………-445
TOTAL HEATING UNITS LAST SEASON TO DATE…..5680   DIFFERENCE……..+196

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH……………7   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE SEASON………….69   DEPARTURE………+38
TOTAL COOLING UNITS LAST SEASON TO DATE……..58   DEPARTURE………+11

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 ENE AT  1:26 P.M.
AERO…………………….26 ENE AT  1:33 P.M.
ASOS…………………….28 ENE AT  1:26 A.M.
DAVIS……………………29 M   AT  1:25 P.M.** RMY 29
FASTEST MILE FOR YESTERDAY………………….20 ENE AT  1:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 ENE AT  1:27 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 M   AT  1:27 P.M.**
AVERAGE WIND SPEED AND DIRECTION……………11.5 ENE
ASOS……………………11.5
DAVIS…………………..10.8

** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.69  DEPARTURE……+0.52
ASOS…………..0.79
TOTAL PRECIPITATION FOR THE MONTH……….0.82  DEPARTURE……-0.01
ASOS…………..0.86
TOTAL PRECIPITATION FOR THE YEAR……….28.14  DEPARTURE……+4.83
ASOS………….29.73

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/-4/0.00/0.0/272/31    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/-8/0.15/0.0/133/15    22 E   AERO 17 E   RMY N/A
5/20 77/54/66/+8/0.27/0.0/000/00    33 SW  AERO 31 SW  RMY 33 TSTM
5/21 77/52/65/+6/0.00/0.0/861/97    22 W   AERO 18 W   RMY 20
5/22 68/51/60/+1/0.04/0.0/000/00    23 SSW AERO 21 S   RMY 22
5/23 82/51/67/+8/0.06/0.0/677/76    33 NNW AERO 33 NNW RMY 34 TSTM
5/24 74/50/62/+3/0.00/0.0/795/89    28 SSW AERO 25 SSW RMY 27
5/25 86/50/68/+8/0.00/0.0/779/87    40 W   AERO 39 W   RMY 43
5/26 88/61/75/+15/0.00/0.0/502/56   38 ENE AERO 38 ENE RMY 39
5/27 61/47/54/-6/0.07/0.0/000/00    32 ENE AERO 30 ENE RMY N/A
5/28 60/48/54/-7/0.05/0.0/027/03    23 S   AERO 21 S   RMY N/A
5/29 85/56/71/+10/0.00/0.0/775/86   23 WSW AERO 23 WSW RMY N/A
5/30 72/59/66/+5/0.00/0.0/758/84    21 S   AERO 20 S   RMY 21
5/31 81/54/68/+7/0.00/0.0/759/84    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

6/01 78/62/70/+8/T/…/..            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/0.00/…/..         26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/…/..        28 ENE AERO 25 ENE RMY N/A
6/04 52/45/49/-14/…/…./..        29 ENE AERO 26 ENE RMY 29

6/05  Low temp since midnight is 48F; normal low is now 54F

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

RECORDS FOR JUNE 6
HIGH 95F IN 1925
LOW 42F IN 1885, 1894, 1920, 1945
PRECIP 3.61 INS IN 2000
PEAK GUST 58 MPH NE IN 2000

TODAY’S REPORT PREPARED BY: Kaitlin Geagan/Devin Richardt