Tuesday, June 30, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 30, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR, STILL DAY TO ROUND OUT JUNE AS CLOUDS FILTER IN

Skies cleared quickly this morning, revealing 80 miles of
visibility in all directions at this morning’s 7:00 AM EST
observation. Winds have been near calm for most of the morning,
with only a slight breeze from the SW.

By the 1:00 PM EST observation small cumulus had begun to
develop and thicken into a few moderate to towering cumulus.
Hazy conditions had set in, with visibilities falling to
60 miles in all directions. A maximum of 81F had been
reached as well.
Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant in all directions
Temperature: 67F; Dew Point: 59F; Wind: estimated W at 3 kts,
Wind Speed: Light
Sea-level pressure: 30.02 ins. Hg, rising, then more quickly
Visibility: 80 miles
6-hr Max temp: 67F
6-hr Min temp: 60F
24-hr precip: none
BHO SA 1155 CLR 80 165/67/59/E2803/002/ FEW AC DSNT ALQDS
WND LGT/ 8/030 53010 10067 20060

10 A.M.
Weather: Clear, few small cumulus in directions,
few altocumulus distant WNW-NW, few cirrus distant SSW
and WSW-WNW
Temperature: 74F; Dew Point: 60F; Wind: estimated SW at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.01 ins. Hg, rising, then falling and lower
Visibility: 80 miles
BHO SA 1455 CLR 80 164/74/60/E2305/001/ FEW SML CU ALQDS
FEW AC DSNT WNW-NW FEW CI DSNT SSW AND WSW-WNW/ 8/131 58001

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 81F; Dew Point: 63F; Wind: SSW at 7 kts,
Sea-level pressure: 29.99 ins. Hg, falling, then more quickly
Visibility: 60 miles, light distant haze
6-hr Max temp: 81F
6-hr Min temp: 67F
BHO SA 1755 32 SCT 250 SCT 60 156/81/63/2007/999/ FEW MDT CU
DSNT SSW-S LGT DSNT HZ ALQDS/ 8/201 58008 10081 20067
SUMMARY FOR MONDAY, JUNE 29, 2015

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..79
MIN…..50   NORMAL…..61
MEAN….61   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………-9
TOTAL DEPARTURE FOR THE MONTH…………………..-47 [-1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4  DEPARTURE………..+3
TOTAL HEATING UNITS FOR THE MONTH………….101  DEPARTURE……….+28
TOTAL HEATING UNITS FOR THE SEASON………..6505  DEPARTURE………+130
TOTAL HEATING UNITS LAST SEASON TO DATE……6422  DIFFERENCE………+83

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE MONTH…………..83   DEPARTURE………-16
TOTAL COOLING UNITS FOR THE SEASON…………132   DEPARTURE……….+9
TOTAL COOLING UNITS LAST SEASON TO DATE…….100   DIFFERENCE……..+32

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17  SSW  AT   8:49 P.M.
ASOS……………………18  SSW  AT   8:53 P.M.
DAVIS…………………..18  SSW  AT   8:51 P.M. RMY 18
FASTEST MILE FOR YESTERDAY…………………13  SSW  AT   8:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14  SSW  AT   8:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13  SSW  AT   8:46 P.M.
AVERAGE WIND SPEED AND DIRECTION…………. 6.5 SW
ASOS…………………..6.8
DAVIS………………….5.5 SW [226 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.12
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..4.90  DEPARTURE…..+0.70
ASOS……………4.92
TOTAL PRECIPITATION FOR THE YEAR………. 24.27   DEPARTURE….-2.46
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/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/…./522/57              26 S   RMY 29
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/…./000/00               25 SE  RMY 26
6/16 73/56/65/-1/…./009/01               18 NW  RMY N/A
6/17 70/57/64/-3/0.00/605/66               28 NE  RMY 28
6/18 76/54/65/-2/0.00/669/73               22 S   RMY 26
6/19 84/60/72/+5/T/642/70                  24 SSW RMY 22
6/20 75/56/66/-2/…./559/61               23 SSE RMY N/A
6/21 76/60/68/0/…./202/22                26 S   RMY 29
6/22 83/63/73/+5/0.00/770/84               20 WNW RMY 19
6/23 85/67/76/+8/0.01/284/31               36 S   RMY 38
6/24 82/62/72/+3/0.00/899/98               25 WNW RMY 27
6/25 80/60/70/+1/0.00/605/66               21 W   RMY N/A
6/26 72/58/65/-4/0.01/…/..               23 NNE RMY 21
6/27 73/56/65/-4/…./…/..               32 ESE RMY N/A
6/28 59/50/55/-15/…./000/00              39 ENE RMY 38
6/29 71/50/61/-9/…./…/..               17 SSW RMY 18

6/30 low since midnight is 60F; normal low is now 61F

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 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957

RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH] PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH] PEAK GUST 52 MPH WNW IN 1974

TODAY’S REPORT PREPARED BY: Brian Fitzgerald