Monday, June 15, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 15, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

MUCH NEEDED RAINFALL TODAY ALONG WITH COOL TEMPERATURES

It’s been a rainy day at the summit today, with rain beginning early
this morning and continuing into the afternoon.  The steadiest rain fell
from about 6:00-10:00 this morning, when rain was moderate at times.
Otherwise, it has been primarily light rain and drizzle.  A total of 0.48
inches of rain has fallen so far.  This is needed rainfall, as we continue
to run a sizable deficit for the year.  It has been a chilly rain as well,
with temperatures falling slowly for much of the morning, hovering in the
low-mid 50s, with our high for the day so far of 61F coming at midnight.
Winds have been from the ESE for most of the day, running at about 10-15mph,
with gusts close to 25mph.

Today’s Observations:

7 A.M.
Weather: Moderate rain and fog, overcast nimbostratus
Temperature: 54F; Dew Point: 53F; Wind: SE at 11 kts
Sea-level pressure: 30.13 ins. Hg, rising then rising more rapidly
Visibility: 4 miles, moderate rain and fog
6-hr Max temp: 61F
6-hr Min temp: 54F
24-hr precip: 0.23 ins.
BHO SA 1155 E40 OVC 4RF 203/54/53/1411/013/ 8/02/ 53013
ASOS 60021 ASOS 70021 MANUAL 70023 10061 20054

10 A.M.
Weather: Sky obscured with light rain and fog, stratus fractus drifting
below summit
Temperature: 53F; Dew Point: 53F; Wind: ESE at 10 kts
Sea-level pressure: 30.11 ins. Hg, falling slightly
Visibility: 1/4 mile, light rain and fog
3-hr precip: 0.20 ins.
BHO SA 1455 W3 X 1/4R-F 197/53/53/1210/011/ STFRA DRFTNG BLO SMT/ 8////
56006 MANUAL 60020 ASOS 60021

1 P.M.
Weather: Sky obscured with drizzle and fog, stratus fractus drifting
below summit
Temperature: 55F; Dew Point: 55F; Wind: ESE at 12 kts
Sea-level pressure: 30.09 ins. Hg, falling then falling more rapidly
Visibility: 1/2 miles, light rain and fog
6-hr Max temp: 56F
6-hr Min temp: 53F
6-hr precip: 0.25 ins.
BHO SA 1755 W3 X 1/2LF 190/55/55/1112/009/ STFRA DRFTNG BLO SMT/
8//// 58007 ASOS 60026 MANUAL 60025 10056 20053

SUMMARY FOR SUNDAY, JUNE 14, 2015

TEMPERATURE (DEGREES F)
MAX…..75   NORMAL…..75
MIN…..61   NORMAL…..57
MEAN….68   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL……………………+2
TOTAL DEPARTURE FOR THE MONTH…………………..-25 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE………..-3
TOTAL HEATING UNITS FOR THE MONTH…………..78  DEPARTURE……….+27
TOTAL HEATING UNITS FOR THE SEASON………..6482  DEPARTURE………+128
TOTAL HEATING UNITS LAST SEASON TO DATE……6421  DIFFERENCE………+61

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..3   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH………….38   DEPARTURE……….+8
TOTAL COOLING UNITS FOR THE SEASON…………87   DEPARTURE………+33
TOTAL COOLING UNITS LAST SEASON TO DATE…….40   DIFFERENCE……..+50

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21  SSE  AT   9:27 P.M. *
ASOS…………………..21  ENE  AT   9:51 A.M.
DAVIS………………….20  ENE  AT   9:51 A.M. RMY 21
FASTEST MILE FOR YESTERDAY………………..15  NE   AT  10:06 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..16  NE   AT  10:05 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15  NE   AT  10:05 A.M.
AVERAGE WIND SPEED AND DIRECTION………….10.0 NW
ASOS………………….10.1
DAVIS…………………8.3  ENE [073 deg.] *last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.23   DEPARTURE….+0.08
ASOS……………0.21
TOTAL PRECIPITATION FOR THE MONTH………..1.81   DEPARTURE….-0.47
ASOS……………1.81
TOTAL PRECIPITATION FOR THE YEAR………. 21.18   DEPARTURE….-3.63
ASOS……………N/A ***
*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/…./000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A
6/11 85/61/73/+8/0.00/…/..               29 SSW RMY 32
6/12 86/65/76/+11/…./…/..              26 S   RMY 29
6/13 83/67/75/+10/T/…/..                 24 N   RMY 27
6/14 75/61/68/+2/0.00/…/..               21 SSE RMY 21

6/15 low since midnight is 53F; normal low is now 57F

DAILY RECORDS FOR JUNE 2015
6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004

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

RECORDS FOR JUNE 15
HIGH 94F IN 1988
LOW 42F IN 1959, 1978
PRECIP 2.04 INS IN 1903
PEAK GUST 52 MPH SW IN 1972

RECORDS FOR JUNE 16
HIGH 92F IN 1891, 1967
LOW 44F IN 1926
PRECIP 2.17 INS IN 1931
PEAK GUST 55 MPH W IN 1958

TODAY’S REPORT PREPARED BY: Jonathan O’Brien