BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JULY 30, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME HAZY, HOT, AND HUMID ON TOP OF THE GREAT BLUE HILL… We observed limited visibility of 25 miles this morning, which increased to 30 miles due to decreasing in haze in the afternoon. Wind were nearly calm throughout the day with the highest wind speed seen so for today being 6 miles per hour. Dew points stayed around 70 degrees throughout the day. The high so far today is 91F, which is 10 degrees above the average daily maximum of 81F. The low since midnight is 71F, 8 degrees above the daily normal minimum of 63F. Today's Observations: 7 A.M. Weather: Scattered cirrus Temperature: 76F; Dew Point: 70F; Wind: WSW at 6 kts Sea-level pressure: 30.01 ins. Hg, steady, then rising Visibility: 25 miles, Haze 6-hr Max temp: 76F 6-hr Min temp: 71F 24-hr Precip: 0.01 ins. BHO SA 1155 250 SCT 25 165/76/70/2406/001/ HAZY WND LGT/ 8/001 70001 53009 10076 20071 10 A.M. Weather: Scattered cirrus Temperature: 87F; Dew Point: 71F; Wind: W at 4 kts Sea-level pressure: 30.03 ins. Hg, rising, then steady Visibility: 25 miles, Haze 3-hr Precip: 0.00 ins. BHO SA 1455 250 SCT 25 168/87/71/2804/003/ HAZY WND LGT/ 8/001 51003 1 P.M. Weather: Scattered cumulus, Scattered cirrus Temperature: 91F; Dew Point: 70F; Wind: S at 6 kts Sea-level pressure: 30.00 ins. Hg, rising, then falling Visibility: 30 miles, Haze 6-hr Max temp: 93F 6-hr Min temp: 76F 6-hr Precip: 0.00 ins. BHO SA 1755 65 SCT 250 SCT 30 161/91/70/1906/000/ HAZY WND LGT/ 8/202 58007 10093 20076 SUMMARY FOR MONDAY, JULY 29, 2019 TEMPERATURE (DEGREES F) MAX.....89   NORMAL.....81 MIN.....71   NORMAL.....63 MEAN....80   NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL......................+8 TOTAL DEPARTURE FOR THE MONTH.....................+94 [+3.2 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............15   DEPARTURE.........+3 TOTAL COOLING UNITS FOR THE MONTH.............291   DEPARTURE........+83 TOTAL COOLING UNITS FOR THE SEASON............380   DEPARTURE........+43 TOTAL COOLING UNITS LAST SEASON TO DATE.......437   DEPARTURE........-57 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................23 W AT 2:45 P.M.                    AERO.........................25 W AT 2:48 P.M.                    ASOS.........................24 W AT 2:47 P.M.                    DAVIS........................24 W AT 2:47 P.M. RMY 21 FASTEST MILE FOR YESTERDAY......................14 W AT 2:44 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................16 W AT 2:48 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 W AT 2:48 P.M. AVERAGE WIND SPEED AND DIRECTION...............8.8 W                    ASOS........................9.5                    DAVIS.......................8.9 WSW [239 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE......-0.14                          ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........4.91  DEPARTURE......+1.20                          ASOS..............4.95 TOTAL PRECIPITATION FOR THE YEAR..........34.78  DEPARTURE......+4.10                          ASOS.............34.72 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/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A 07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23 07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18 07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17 07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21 07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A 07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A 07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A 07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18 07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17 07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36 07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32 07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20 07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23 07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22 07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21 07/17 90/70/80/+8/1.32/.../..               44 W   AERO M  M   RMY 47 07/18 72/61/67/-5/0.04/.../..               33 NE  AERO 36 NE  RMY 33 07/19 89/61/75/+3/0.00/.../..               24 WSW AERO 26 SW  RMY 25 07/20 93/75/84/+12/0.00/.../..              21 WSW AERO 22 WSW RMY N/A 07/21 92/76/84/+12/0.00/.../..              31 W   AERO 35 W   RMY 31 07/22 81/64/73/+1/..../.../..               35 ENE AERO 37 ENE RMY 34 07/23 66/58/62/-10/..../.../..              30 NNE AERO 33 NNE RMY 30 07/24 77/60/69/-3/..../.../..               14 NE  AERO 15 NE  RMY N/A 07/25 80/61/71/-1/..../.../..            17 SSE AERO 23 N   RMY 17 07/26 84/62/73/+1/0.00/.../..               22 SSE AERO 23 SSE RMY 20 07/27 83/64/74/+2/..../.../..               21 S   AERO 23 S   RMY 21 07/28 89/64/77/+5/..../.../..               25 WSW AERO 36 WSW RMY 26 07/29 89/71/80/+8/..../.../..               23 W   AERO 25 W   RMY 21 7/30 Low temp since midnight is 71F; normal low is 63F DAILY RECORDS FOR JULY 2019 7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F, BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015 7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F, BREAKS PREVIOUS RECORD OF 75F SET IN 1991 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 30 HIGH 99F IN 1949 LOW 51F IN 1956 PRECIP 1.84 INS IN 1976 PEAK GUST 70e MPH SW 1944 RECORDS FOR JULY 31 HIGH 95F IN 1917 LOW 50F IN 1895,1918 PRECIP 1.34 INS IN 1892 PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971 TODAY'S REPORT PREPARED BY: Nicholas Rousseau