Thursday, July 18, 2019
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 18, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME
COOL DAY WITH DROPPING HUMIDITY AFTER AN INTENSE WEATHER DAY….
This morning, 1.32 inches of rain was measured in our standard
weighing gage after a few intense thunderstorms yesterday afternoon.
Lightning struck close by, so a few of our automated systems and
wind recorders had malfunctions; additionally, the power went out,
and we have been running on generator power for the duration of the
day. Our high temperature yesterday was 90F, and dropped quickly to 70F
following yesterday’s storms in only a 2 hour period, averaging a 10
degree drop per hour during this time. Overnight, temperatures stayed
around 72F, dropping this morning to 61F with northeasterly winds at
around 9 AM. Since then, the temperature has been rising, and as of
1 PM it is 65F.
PRELIMINARY STATS FOR JUNE 2019
TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1]
Avg. Min. 57.3 [+0.2]
Mean 66.2 [+0.1]
24-hour corrected mean: 66.0
Max. for month: 88F on the 28th
Min. for month: 45F on the 4th
COOLING DEGREE DAYS
Total cooling units: 81 [-24]
Total for the season: 89 [-40]
Total for last season: 159
HEATING DEGREE DAYS
Total cooling units: 36 [-37]
Total for the season: 6254 [-122]
Total for last season: 5916
PRECIPITATION, Inches
Total: 4.08 [-0.23]
Greatest in 24 hrs: 1.30 ins. on the 10th-11th
WIND, mph
Avg. uncorrected wind speed: 9.9
Avg. corrected wind speed: 10.5
Prevailing wind direction: S at 17%
Peak gust and direction: 41 W on 3rd
SUNSHINE:
Campbell-Stokes card minutes: 14118 minutes of possible 26376 or 54%
Astronomical total minutes: 14674 minutes of possible 27416 or 54%
Today’s Observations:
7 A.M.
Weather: Overcast stratus
Temperature: 66F; Dew Point: 65F; Wind: NE at 12 kts
Sea-level pressure: 30.01 ins. Hg, rising steadily
Visibility: 30 miles, distant haze
6-hr Max temp: 72F
6-hr Min temp: 63F
24-hr Precip: 1.32 ins.
BHO SA 1155 E15 OVC 30 161/66/65/0412/001/ DSNT FOG ALQDS/
8/6// 52014 10072 20063
10 A.M.
Weather: Overcast stratus
Temperature: 63F; Dew Point: 62F; Wind: NE at 8 kts
Sea-level pressure: 30.01 ins. Hg, steady
Visibility: 20 miles, distant haze
3-hr Precip: 0.03 ins.
BHO SA 1455 E15 OVC 20 161/63/62/0408/001/ DSNT HZ ALQDS
DSNT FOG N-SE/ 8/6// 54000 6003/
1 P.M.
Weather: Overcast stratus
Temperature: 65F; Dew Point: 59F; Wind: NE at 7 kts
Sea-level pressure: 30.01 ins. Hg, rising then falling
Visibility: 40 miles, distant haze
6-hr Max temp: 66F
6-hr Min temp: 61F
6-hr Precip: 0.03 ins.
BHO SA 1755 E17 OVC 40 162/65/59/0407/001/ DSNT HZ ALQDS/
8/6// 50001 6003/ 10066 20061
SUMMARY FOR WEDNESDAY, JULY 17, 2019
TEMPERATURE (DEGREES F)
MAX…..90 NORMAL…..81
MIN…..70 NORMAL…..63
MEAN….80 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL………………….+8
TOTAL DEPARTURE FOR THE MONTH…………………+69 [+3.9 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..15 DEPARTURE………+8
TOTAL COOLING UNITS FOR THE MONTH………….179 DEPARTURE……..+65
TOTAL COOLING UNITS FOR THE SEASON…………268 DEPARTURE……..+25
TOTAL COOLING UNITS LAST SEASON TO DATE…….325 DEPARTURE……..-57
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..44 W AT 4:43 P.M.
AERO……………………..M
ASOS……………………..M
DAVIS……………………44 SW AT 1:26 P.M. RMY 47
FASTEST MILE FOR YESTERDAY………………….38 W AT 4:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..M
MAXIMUM 2-MINUTE DAVIS AVERAGE………………34 S AT 4:27 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….10.9 SW
ASOS…………………….M
DAVIS……………………10.9 SW [235 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.32 DEPARTURE……+1.19
ASOS……………..M
TOTAL PRECIPITATION FOR THE MONTH……….2.77 DEPARTURE……+0.69
ASOS……………..M
TOTAL PRECIPITATION FOR THE YEAR……….32.64 DEPARTURE……+3.59
ASOS……………..M
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
06/01 71/54/63/+1/0.00/551/61 21 E AERO 20 E RMY 18
06/02 75/51/63/+1/0.02/417/46 23 S AERO 21 S RMY N/A
06/03 69/50/60/-2/0.02/753/83 41 W AERO 39 W RMY 43
06/04 70/45/58/-5/0.00/717/79 29 W AERO 23 W RMY N/A
06/05 81/57/69/+6/0.03/527/58 33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/0.06/428/47 28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76 23 S AERO 23 S RMY 22
06/08 78/57/68/+4/0.00/885/97 23 ENE AERO 21 SW RMY 21
06/09 78/55/67/+3/0.00/840/93 22 S AERO 21 S RMY 21
06/10 79/54/67/+2/0.29/712/78 26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/1.03/247/27 32 NW AERO 30 NW RMY 35
06/12 75/52/64/-1/0.00/869/95 25 SSW AERO 25 S RMY 28
06/13 55/49/52/-13/0.81/000/00 36 NE AERO 35 NE RMY 35
06/14 72/50/61/-5/0.00/540/59 38 W AERO 39 W RMY 38
06/15 79/54/67/+1/0.00/879/96 38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/0.13/000/00 32 SW AERO 35 SW RMY N/A
06/17 74/62/68/+1/0.00/348/38 12 SSE AERO 18 NW RMY 17
06/18 71/62/67/0/0.10/000/00 17*S AERO 17 S RMY 16
06/19 74/61/68/+1/0.00/101/11 16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/0.26/000/00 26 S AERO 26 S RMY 29
06/21 68/58/63/-5/0.75/018/02 32 NW AERO 28 NW RMY 33
06/22 77/56/67/-1/T/779/85 33 NW AERO 32 NW RMY 35
06/23 82/59/71/+3/0.00/871/95 30 NW AERO 25 WNW RMY 29
06/24 84/61/73/+4/0.00/779/85 22 NW AERO 21 NW RMY 22
06/25 73/61/67/-2/0.18/083/09 35 S AERO 37 S RMY 37
06/26 77/64/71/+2/0.00/559/61 12 ENE AERO 18 SE RMY N/A
06/27 81/57/69/0/0.00/614/67 21 NE AERO 18 NE RMY N/A
06/28 88/64/76/+6/0.00/870/95 16 SW AERO 18 SW RMY N/A
06/29 80/66/73/+3/0.29/165/18 25 W AERO 25 W RMY 26
06/30 75/59/67/-3/0.13/430/47 31 N AERO 30 N RMY 35
*Estimated
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
07/01 83/58/71/+1/0.00/…/.. 21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/.. 23 W AERO 23 W RMY 23
07/03 89/67/78/+7/0.00/…/.. 18 S AERO 18 S RMY 18
07/04 88/68/78/+7/0.00/…/.. 17 SSW AERO M M RMY 17
07/05 87/69/78/+7/0.00/…/.. 21 SW AERO M M RMY 21
07/06 90/71/81/+10/0.83/…/.. 26 WNW AERO M M RMY N/A
07/07 78/64/71/0/0.00/…/.. 30 NE AERO M M RMY N/A
07/08 79/59/69/-3/0.00/…/.. 16 N AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/…/.. 18 NW AERO 16 NW RMY 18
07/10 88/69/79/+7/0.00/…/.. 20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/…/.. 35 S AERO 33 S RMY 36
07/12 84/68/76/+4/0.00/…/.. 31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/…/.. 21 W AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/…/.. 25 W AERO 21 W RMY 23
07/15 82/63/73/+1/0.00/…/.. 24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/…/.. 23 W AERO 21 W RMY 21
07/17 90/70/80/+8/1.32/…/.. 44 W AERO M M RMY 47
07/18 Low temp since midnight is 61F; normal low is 63F
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: Samantha Richard
