BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, MAY 22, 2019 ALL TIMES ARE IN EASTERN STANDARD TIME FAIR WEATHER WITH DECREASING NORTHWESTERLY WINDS IN THE AFTERNOON.... We observed fair weather conditions today, with a translucent layer of cirrus clouds becoming more prominent following noontime. Wind has decreased in intensity since this morning, becoming light and variable shortly following the 1 P.M. observation. An excellent visibility of 85 miles was seen throughout the day. Humidity has been low since this morning, reaching only 30 percent in the afternoon. The high so far today is 67F, a degree below the daily normal maximum of 68F. the low since midnight is 49F, a degree below the normal minimum of 50F. Today's Observations: 7 A.M. Weather: Scattered cirrostratus, few altocumulus Temperature: 54F; Dew Point: 35F; Wind: NNW at 12G25 kts, Peak wind: 32 MPH (28 kts) NNW at 6:14 A.M. Sea-level pressure: 30.13 ins. Hg, rising steadily Visibility: 85 miles 6-hr Max temp: 54F 6-hr Min temp: 49F 24-hr Precip: 0.00 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1155 250 SCT 85 202/54/35/3412G25/013/ FEW AC ALQDS PK WND 3028/14/ 8/085 51024 10054 20049 10 A.M. Weather: Broken cirrostratus, few cumulus Temperature: 60F; Dew Point: 36F; Wind: NW at 14G19 kts Sea-level pressure: 30.18 ins. Hg, rising steadily Visibility: 85 miles 3-hr Precip: 0.00 ins. BHO SA 1455 250 BKN 85 221/60/36/3314G19/018/ FEW CU ALQDS/ 8/107 51019 1 P.M. Weather: Broken cirrostratus, few cumulus Temperature: 67F; Dew Point: 35F; Wind: NW at 15G28 kts Sea-level pressure: 30.17 ins. Hg, rising then falling Visibility: 85 miles 6-hr Max temp: 67F 6-hr Min temp: 54F 6-hr Precip: 0.00 ins. BHO SA 1755 250 BKN 85 219/67/35/3308G18/017/ FEW CU ALQDS/ 8/107 58002 10067 20054 SUMMARY FOR TUESDAY, MAY 21, 2019 TEMPERATURE (DEGREES F) MAX.....69 NORMAL.....68 MIN.....50 NORMAL.....49 MEAN....60 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL........................+2 TOTAL DEPARTURE FOR THE MONTH.......................-54 [-2.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY...............4 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE MONTH.............253 DEPARTURE........+49 TOTAL HEATING UNITS FOR THE SEASON...........6154 DEPARTURE........-88 TOTAL HEATING UNITS LAST SEASON TO DATE......5817 DIFFERENCE......+337 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY...............0 DEPARTURE.........-1 TOTAL COOLING UNITS FOR THE MONTH...............4 DEPARTURE.........-6 TOTAL COOLING UNITS FOR THE SEASON..............4 DEPARTURE.........37 TOTAL COOLING UNITS LAST SEASON TO DATE........37 DEPARTURE........-33 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY....................40 NW AT 5:27 P.M. AERO.........................46 NW AT 1:24 P.M. ASOS.........................45 NW AT 3:38 P.M. DAVIS........................45 W AT 3:37 P.M. RMY 45 FASTEST MILE FOR YESTERDAY......................32 NW AT 3:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...................30 NW AT 3:39 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..................32 W AT 3:39 P.M. AVERAGE WIND SPEED AND DIRECTION...............19.1 NW ASOS........................18.9 DAVIS.......................19.1 W [271 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.......-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.00 DEPARTURE.......+0.39 ASOS..............2.82 TOTAL PRECIPITATION FOR THE YEAR..........24.18 DEPARTURE.......+3.02 ASOS.............24.03 PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 05/01 57/40/49/-4/0.00/0.0/.../.. 21 S AERO 21 SSE RMY 21 05/02 45/41/43/-10/0.02/0.0/.../.. 21 NE AERO 21 SSW RMY 20 05/03 60/43/52/-1/..../.../.../.. 23 S AERO 23 S RMY 22 05/04 54/46/50/-4/..../.../.../.. 14 ENE AERO 14 ENE RMY 17 05/05 52/44/48/-6/0.00/0.0/.../.. 18 NE AERO 20 NE RMY N/A 05/06 58/44/51/-3/..../0.0/.../.. 25 NE AERO 26 ENE RMY 24 05/07 72/41/57/+2/0.12/0.0/.../.. 30 S AERO 29 S RMY 30 05/08 67/48/58/+3/0.00/0.0/.../.. 20 NE AERO 20 NE RMY 19 05/09 60/43/52/-3/0.00/0.0/.../.. 21 SE AERO 21 E RMY 22 05/10 61/46/54/-1/0.16/0.0/.../.. 35 S AERO 37 S RMY 37 05/11 68/50/59/+3/..../.../.../.. 26 NW AERO M M RMY N/A 05/12 50/36/43/-13/0.68/.../.../.. 30 ENE AERO M M RMY N/A 05/13 52/38/45/-11/..../.../.../.. 35 E AERO M M RMY 34 05/14 44/38/41/-16/..../.../.../.. 26 NNE AERO M M RMY 25 05/15 58/40/49/-8/..../.../.../.. 28 NW AERO M M RMY 28 05/16 68/46/57/0/..../.../.../.. 17 NW AERO M M RMY 19 05/17 64/49/57/0/..../.../.../.. 22 WNW AERO 21 WNW RMY 25 05/18 72/49/61/+3/..../.../.../.. 26 SSE AERO 25 SSE RMY 29 05/19 69/50/60/+2/..../.../.../.. 39 S AERO 43 SSE RMY 42 05/20 85/52/69/11/..../.../.../.. 35 SW AERO 40 SW RMY 39 05/21 69/52/61/+2/0.00/.../.../.. 40 NW AERO 46 NW RMY 45 05/22 Low temp since midnight is 49F; normal low is 50F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 22 HIGH 93F IN 1911 LOW 35F IN 1907 PRECIP 3.75 INCHES IN 1920 PEAK GUST 49e MPH SSW IN 1947 RECORDS FOR MAY 23 HIGH 92F IN 1964,1992 LOW 38F IN 1976 PRECIP 0.97 INS IN 1979 PEAK GUST 49e MPH W IN 1945 TODAY'S REPORT PREPARED BY: Benjamin Turner