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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 18, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
CLOUDY AND HUMID WITH OCCASIONAL SHOWERS AND THUNDERSHOWERS
IN THE AREA
The minimum temperature this morning was much higher than the last
few nights at 63F, as the dew point has climbed into the lower and
middle 60s today. Clouds have dominated with no sunshine being
observed into early afternoon. A heavy rain shower brought 0.16
inches in a little under an hour ending at 6:30 AM EST today.
Occasional very light rain showers later in the morning brought
only traces of rain. A heavy thundershower was passing well SW
of the summit at the time of the 1 PM EST observation. Distant
lightning was observed from SW to S between 1:30 PM and 2 PM EST
as the storm passed, and thunder was heard for five minutes
starting at 1:29 PM EST. The wind has increased from the SSW
during the day with gusts approaching 30 mph as of early afternoon.
Today’s Observations:
7 A.M.
Weather: Scattered stratus and nimbostratus, broken stratocumulus,
overcast stratocumulus, rain ended at 0630E, rain showers NNW-SSE
moving east, hazy
Temperature: 63F; Dew Point: 62F; Wind: S at 10 kts
Sea-level pressure: 30.02 ins. Hg, falling
Visibility: 35 miles, visibility north 20, south 50 miles
6-hr Max temp: 65F
6-hr Min temp: 63F
24-hr precip: 0.16 ins.
BHO SA 1155 25 SCT E45 BKN 55 OVC 35 166/63/62/1710/002/ VSBY N 20
S 50 HAZY RE30 RW NNW-SSE MVNG E/ 8/5// 58001 6016/ 70016 10065
20063
10 A.M.
Weather: Light rain shower, overcast stratocumulus, few lower cumulus
and cumulus fractus distant ESE-SSE, few lower stratus NE-SE, hazy,
precipitation very light, rain shower began 0935E, ended 0940E,
began 0950E
Temperature: 67F; Dew Point 62F; Wind: S at 15G21 kts,
Sea-level pressure: 29.99 ins. Hg, falling
Visibility: 35 miles, visibility NNE 25, SE-SSW 50 miles
3-hour precip: Trace
BHO SA 1455 E30 OVC 35RW- 156/67/62/1815G21/999/ FEW LWR CU/CUFRA
DSNT ESE-SSE FEW LWR STRA VSBY NNE 25 SE-SSW 50 HAZY PCPN VRY LGT
RWB35E40B50/ 8/5// 56010 6000/
1 P.M.
Weather: Scattered stratocumulus, overcast stratocumulus, higher clouds
visible distant E-SSW, hazy, rain shower WSW moving ESE
Temperature: 73F; Dew Point: 64F; Wind: SSW at 13G21 kts,
Sea-level pressure: 29.96 ins. Hg, falling
Visibility: 40 miles, visibility WSW 15, S-SE 50 miles
6-hr Max temp: 75F
6-hr Min temp: 63F
6-hour precip: Trace
BHO SA 1755 E25 SCT 35 OVC 40 147/73/64/2113G21/996/ HIR CLDS VSBL
DSNT E-SSW VSBY WSW 15 SE-S 50 HAZY RW WSW MVNG ESE/ 8/5// 58009 6000/
10075 20063
SUMMARY FOR FRIDAY, JULY 17, 2015
TEMPERATURE (DEGREES F)
MAX…..79 NORMAL…..81
MIN…..56 NORMAL…..63
MEAN….68 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH……………………+1 [-0.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3 DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH………….112 DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE SEASON…………250 DEPARTURE……….+7
TOTAL COOLING UNITS LAST SEASON TO DATE…….257 DIFFERENCE………-7
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 S AT 6:02 P.M.
ASOS……………………22 S AT 6:02 P.M.
DAVIS…………………..20 S AT 6:01 P.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………16 S AT 6:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 SSW AT 9:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 S AT 6:02 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.8 SSW
ASOS…………………..8.1
DAVIS………………….7.0 SSW [213 deg.]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.16 DEPARTURE…..+0.02
ASOS……………0.16
TOTAL PRECIPITATION FOR THE MONTH………..2.98 DEPARTURE…..+0.91
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.25 DEPARTURE…..-1.79
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 80/63/72/+2/0.59/466/51 30 SSE RMY 33 TSTM
7/2 78/60/69/-1/0.00/721/79 23 WNW RMY N/A
7/3 79/58/69/-2/0.00/867/95 17 SSW RMY 17
7/4 74/61/68/-3/T/109/12 16 S RMY N/A
7/5 82/58/70/-1/0.00/865/95 20 WSW RMY 20
7/6 85/64/75/+4/0.00/755/83 20 S RMY 21
7/7 84/65/75/+4/0.02/445/49 35 S RMY 40
7/8 87/68/78/+6/T/372/41 23 NE RMY N/A
7/9 73/61/67/-5/…./390/43 24 NE RMY 25
7/10 80/59/70/-2/…./535/59 18 W RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96 21 NW RMY 19
7/12 88/67/78/+6/0.00/813/90 20 W RMY 17
7/13 82/66/74/+2/0.00/424/47 21 E RMY 20
7/14 81/64/73/+1/…./396/44 25 S RMY 27
7/15 84/61/73/+1/…./…/.. 24 ENE RMY 26
7/16 72/56/64/-8/0.00/…/.. 25 NNE RMY 24
7/17 79/56/68/-4/0.00/…/.. 21 S RMY N/A
7/18 low since midnight is 63F; normal low is now 63F
DAILY RECORDS FOR JULY 2015
7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JULY 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949
RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982
TODAY’S REPORT PREPARED BY: Mike Iacono
