BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, JULY 18, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0424E SUNSET: 1917E FOGGY AND COOLER WITH INTERMITTENT RAINFALL ATOP GREAT BLUE HILL.... We observed some showers this morning following the rain yesterday which amounted to 0.41 inches by 7 A.M. The showers today left 0.07 inches so far. This brings the monthly rain total to 10.37 inches. That's a monthly surplus of 8.47 inches and a yearly of 4.88 inches. Visibility is poor to say the least at a 1/4th mile with fog being a factor all day. The high so far today is 74F, 8 degrees under the daily average of 82F. The low so far today is 64F, which is the same as the daily average minimum. On a side note, the renovations have begun in earnest this week. We are no longer operating out of the tower and have moved to another part of the building. All wind instruments on the main tower have been taken offline and will remain so until further notice. Please be patient with us as we navigate through our new routine. Data at times may be delayed. ----------------------------------------------- Today's Observations: 7 A.M. Weather: Fog, vertical visibility 300 feet Temperature: 71F; Dew Point: 71F; Relative Humidity: 100% Wind: S @ 9 kts Sea-level pressure: 30.02 in. Hg; steady, then rising Visibility: 1/8th mile, fog 6-hr Max temp: 71F 6-hr Min temp: 66F 24-hr Precip: 0.41 in. BHO SA 1155 X W3 1/8F 167/71/71/1909/002/ 8//// 70041 51004 10071 20066 10 A.M. Weather: Fog, vertical visibility 200 ft Temperature: 71F; Dew Point: 71F; Relative Humidity: 100% Wind: NW @ 7 kts Sea-level pressure: 30.02 in Hg; steady then falling Visibility: 1/16th mile, fog 3-hr Precip: 0.06 ins. BHO SA 1455 X W2 1/16LF 165/71/71/3207/002/ 8//// 6004/ 57002 1 P.M. Weather: Scattered Cumulus, thin broken cirrostratus (cumulonimbus distant SE) Temperature: 77F, Dew point: 70F; Relative Humidity: 80% Wind: ENE @ 8 kts Sea-level pressure: 30.10 in Hg; falling then rising Visibility: 50 miles 6-hr Max temp: 78F 6-hr Min temp: 69F 6-hr Precip: 0.04 ins. SUMMARY FOR SATURDAY, JULY 17, 2021 TEMPERATURE (DEGREES F) MAX.......78 NORMAL.....82 MIN.......64 NORMAL.....64 MEAN......71 NORMAL.....73 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL..........-2 TOTAL DEPARTURE FOR THE MONTH.....................-71 [-4.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................0 DEPARTURE.........0 TOTAL HEATING UNITS FOR THE MONTH...............26 DEPARTURE.......+22 TOTAL HEATING UNITS FOR THE SEASON..............26 DEPARTURE.......+22 TOTAL HEATING UNITS LAST SEASON TO DATE..........1 DEPARTURE.......+25 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................6 DEPARTURE.......-2 TOTAL COOLING UNITS FOR THE MONTH...............83 DEPARTURE......-47 TOTAL COOLING UNITS FOR THE SEASON.............309 DEPARTURE......+40 TOTAL COOLING UNITS LAST SEASON TO DATE........299 DEPARTURE......+10 PEAK WIND GUST (MPH): Official...................26 ENE @ 5:43 P.M. AEROVANE (south tower).....25 ENE @ 5:42 P.M. VECTOR #2 (south tower)....27 @ 5:43 P.M. DAVIS #2 (south tower).....23 ENE @ 5:44 P.M. ASOS...........OUT OF SERVICE D/T RENOVATIONS VECTOR #1......OUT OF SERVICE D/T RENOVATIONS DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS RMY............OUT OF SERVICE D/T RENOVATIONS MERLIN.........OUT OF SERVICE D/T RENOVATIONS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................17 ENE @ 4:37 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............18 @ 4:22 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............18 ENE @ 4:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE RMY AVERAGE........OUT OF SERVICE D/T RENOVATIONS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL.......9.4 NE [226 total miles] VECTOR #2................10.2 DAVIS #2.................10.1 ENE RMY.................OUT OF SERVICE D/T RENOVATIONS ASOS................OUT OF SERVICE D/T RENOVATIONS VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS DAVIS #1............OUT OF SERVICE D/T RENOVATIONS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.41 DEPARTURE....+0.30 TOTAL PRECIPITATION FOR THE MONTH............10.37 DEPARTURE....+8.47 TOTAL PRECIPITATION FOR THE YEAR.............33.75 DEPARTURE....+4.88 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 80/65/73/+2/0.74/155/17 22 W AERO 20 WSW RMY 21 07/02 65/55/60/-11/1.49/000/00 37 NE AERO 36 NE RMY 39 07/03 56/54/55/-17/1.98/000/00 41 NE AERO 44 NE RMY 45 TSTM 07/04 66/54/60/-12/0.16/191/21 26 ENE AERO 23 ENE RMY 26 07/05 74/53/64/-8/0.01/546/60 26 SSW AERO 28 SSW RMY 27 07/06 87/66/77/+5/0.26/255/28 37 W AERO 48 W RMY 38 TSTM 07/07 88/88/77/+5/0.77/699/77 63 NW AERO 75 NW RMY 70 TSTM 07/08 67/59/63/-9/0.38/109/12 46 W AERO 46 W RMY 51 TSTM 07/09 73/62/68/-5/3.02/163/18 40 WNW AERO 44 WNW RMY 43 07/10 71/63/67/-6/0.07/109/12 23 NE AERO 21 NNE RMY 22 07/11 81/61/71/-2/T/325/36 21 SW AERO 19 S RMY N/A 07/12 67/61/64/-9/1.01/000/00 31 ENE AERO 31 ENE RMY N/A 07/13 66/60/63/-10/0.02/.../.. 19 E AERO 18 E RMY N/A 07/14 80/62/71/-2/0.01/.../.. 19 S AERO 18 S RMY N/A 07/15 88/67/78/+5/0.00/.../.. 19 WSW AERO 18 SSW RMY N/A 07/16 90/70/80/+7/..../.../.. 36 NNW AERO 39 NNW RMY N/A 07/17 78/64/71/-2/..../.../.. 26 ENE AERO 25 ENE RMY N/A 07/18 The low since midnight is 64F, the daily normal low is 64F RECORDS FOR JULY: JULY 2: Record daily precipitation of 1.49", Surpasses previous record of 1.42" set in 1986 JULY 3: Record daily precipitation of 1.98", Surpasses previous record of 1.36" set in 1985 JULY 7: Record peak gust of 63 MPH, Surpasses previous record of 55 MPH set in 1989 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: Benjamin Turner