BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JUNE 5, 2015 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT WINDS AND MODERATING TEMPERATURES MAKE WAY FOR POSSIBLE OVERNIGHT SHOWERS Cool temperatures persisted once more overnight, with a low down to 48F, some 6 degrees below the daily norm. Partly cloudy skies have gradually given way to increasing high cirrus along with gently dropping pressure. By the 1:00 PM EST observation skies were mostly cloudy with high cirrus/cirrocumulus overhead. Light distant haze had reduced visibility to just 50 miles in all directions. A maximum of 70F had been recorded by this time as well. BHO Warmest Mays, deg F (1885-2015) 1) 61.5 in 2015 2) 61.4 in 1991 3) 61.0 in 1944 4) 60.9 in 2010 5) 59.4 in 1911 59.4 in 1959 PRELIMINARY STATS FOR MAY 2015 TEMPERATURE, Deg. F Avg. Max. 74.6 [+8.3] Avg. Min. 49.7 [+1.9] Mean 62.2 [+5.1] Corrected mean: 61.5 Max. for month: 88 on 5/10 Min. for month: 35 on 5/2 HEATING DEGREE DAYS Total heating units: 133 [-135] Total for the season: 6404 [+101] Total for last season: 6394 COOLING DEGREE DAYS Total cooling units: 49 [+27] Total for the season: 49 [+25] Total for last season: 13 PRECIPITATION, Inches Total: 1.45 [-2.66] Greatest in 24 hrs: 1.07, 2:00 PM EST on 5/31 thru 1:59 PM EST on 6/1 SNOWFALL, Inches Total: None Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 12.2 Avg. corrected wind speed: 12.6 Prevailing wind direction: SSW @ 23% Peak gust and direction: 40 NE on the 31st SUNSHINE: Astronomical total minutes: 17534 / 27166 or 65% Campbell-Stokes card minutes: 16950 / 26226 or 65% Today's Observations: 7 A.M. Weather: Scattered cirrus, few cumulus in all directions, few altocumulus in all directions Temperature: 55F; Dew Point: 48F; Wind: Calm Sea-level pressure: 30.19 ins. Hg, about the same Visibility: 60 miles, except 40 miles WSW-NE 6-hr Max temp: 55F 6-hr Min temp: 48F 24-hr precip: none BHO SA 1155 180 SCT 60 222/55/48/E0000/019/ VSBY 40 MI WSW-NE FEW CU ALQDS FEW AC ALQDS LGT DSNT HZ WSW-NE WND CLM/ 8/131 53000 10055 20048 10 A.M. Weather: Scattered cirrus, few altocumulus in all directions Temperature: 64F; Dew Point: 48F; Wind: estimated ESE at 4 kts Wind Speed: Light Sea-level pressure: 30.14 ins. Hg, falling, then more slowly Visibility: 60 miles, light distant haze BHO SA 1455 250 SCT 60 206/64/48/E1204/014/ FEW AC ALQDS LGT DSNT HZ ALQDS WND LGT/ 8/031 56016 1 P.M. Weather: Broken cirrus/cirrocumulus, few altocumulus in all directions Temperature: 70F; Dew Point: 54F; Wind: E at 7 kts Sea-level pressure 30.11 ins. Hg, falling, then more quickly Visibility: 50 miles, light distant haze 6-hr Max temp: 70F 6-hr Min temp: 54F 6-hr precip: none BHO SA 1755 E250 BKN 50 196/70/54/0807/011/ FEW AC ALQDS LGT DSNT HZ ALQDS/ 8/039 58020 10070 20054 SUMMARY FOR THURSDAY, JUNE 4, 2015 TEMPERATURE (DEGREES F) MAX.....63 NORMAL.....72 MIN.....46 NORMAL.....54 MEAN....55 NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL........................-8 TOTAL DEPARTURE FOR THE MONTH.......................-49 [-12.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............10 DEPARTURE...........+6 TOTAL HEATING UNITS FOR THE MONTH..............60 DEPARTURE..........+42 TOTAL HEATING UNITS FOR THE SEASON...........6464 DEPARTURE.........+143 TOTAL HEATING UNITS LAST SEASON TO DATE......6406 DIFFERENCE.........+58 COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE..........-2 TOTAL COOLING UNITS FOR THE MONTH..............0 DEPARTURE..........-7 TOTAL COOLING UNITS FOR THE SEASON............49 DEPARTURE.........+18 TOTAL COOLING UNITS LAST SEASON TO DATE.......19 DIFFERENCE........+30 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................17 E AT 4:16 P.M.* ASOS.......................17 NE AT 3:29 P.M. DAVIS......................16 E AT 4:14 P.M. RMY 16 FASTEST MILE FOR YESTERDAY....................11 ESE AT 5:35 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................13 ESE AT 6:52 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................11 E AT 5:26 P.M. AVERAGE WIND SPEED AND DIRECTION..............5.8 ESE ASOS.......................6.3 DAVIS......................5.4 ESE [113 deg.] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE....-0.17 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........1.49 DEPARTURE....+0.83 ASOS...............1.51 TOTAL PRECIPITATION FOR THE YEAR.......... 20.86 DEPARTURE....-2.33 ASOS...............N/A *** *** ASOS annual totals not available due to erroneous readings PRELIMINARY CLIMATE SUMMARY FOR MAY-JUNE CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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 5/1 52/37/45/-8/0.00/0.0/354/42 21 NE RMY 20 5/2 63/35/49/-4/0.00/0.0/668/79 20 S RMY 20 5/3 74/44/59/+6/0.00/0.0/509/60 22 S RMY 22 5/4 83/47/65/+11/0.00/0.0/783/92 39 SSW RMY 45 5/5 77/56/67/+13/0.03/0.0/222/26 29 SW RMY N/A 5/6 74/54/64/+10/0.00/0.0/574/67 24 SSW RMY 25 5/7 84/52/68/+13/0.00/0.0/824/96 29 S RMY 32 5/8 74/44/59/+4/0.00/0.0/809/94 27 NNE RMY 26 5/9 77/44/61/+6/0.00/0.0/509/59 30 S RMY 32 5/10 88/60/74/+19/0.00/0.0/692/80 28 SSW RMY 30 5/11 84/48/66/+10/0.00/0.0/529/61 30 NE RMY 31 5/12 84/47/66/+10/0.24/0.0/287/33 33 WNW RMY 37 5/13 67/47/57/+1/0.00/0.0/820/94 31 WNW RMY N/A 5/14 70/44/57/+0/0.00/0.0/848/97 22 NW RMY 22 5/15 73/51/62/+5/0.00/0.0/491/56 20 WSW RMY 21 5/16 68/53/61/+4/T/0.0/053/06 23 S RMY 24 5/17 79/50/65/+8/T/0.0/783/89 21 NE RMY N/A 5/18 62/48/55/-3/0.00/0.0/538/61 25 NE RMY N/A 5/19 63/50/57/-1/0.36/0.0/000/00 24 S RMY 26 5/20 66/46/56/-2/0.00/0.0/753/85 32 WNW RMY 37 5/21 66/43/55/-4/0.00/0.0/461/52 24 S RMY 24 5/22 73/49/61/+2/T/0.0/711/80 32 NW RMY 36 5/23 64/40/52/-7/0.00/0.0/855/96 28 WNW RMY 32 5/24 81/50/66/+7/0.00/0.0/750/84 28 SSW RMY 31 5/25 80/56/68/+8/0.00/0.0/232/26 29 SSW RMY 31 5/26 83/61/72/+12/0.00/0.0/591/66 30 SSW RMY N/A 5/27 82/62/72/+12/T/0.0/727/81 36 SSW RMY 41 5/28 83/61/72/+11/0.00/0.0/548/61 30 SSW RMY 34 5/29 77/58/68/+7/0.00/0.0/828/92 18 ENE RMY 19 5/30 85/55/70/+9/0.00/0.0/704/78 37 SSW RMY 42 5/31 78/46/62/+1/0.82/0.0/081/09 40 NE RMY 43 TSTM 6/1 48/46/47/-15/0.69/0.0/000/00 32 NE RMY 34 6/2 47/44/46/-16/..../0.0/000/00 28 NNE RMY 28 6/3 59/44/52/-10/0.00/0.0/.../.. 16 ESE RMY 16 6/4 63/46/55/-8/0.00/0.0/.../.. 17 E RMY 16 6/5 low since midnight is 48F; normal low is now 54F DAILY RECORDS FOR MAY 2015 None. DAILY RECORDS FOR JUNE 2015 6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F surpasses previous record of 51F in 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 5 HIGH 95F IN 1930 LOW 41F IN 1891 PRECIP 2.83 INS IN 1982 PEAK GUST 57 MPH NNW IN 1988 RECORDS FOR JUNE 6 HIGH 95F IN 1925 LOW 42F IN 1885, 1894, 1920, 1945 PRECIP 3.61 INS IN 2000 PEAK GUST 58 MPH NE IN 2000 TODAY'S REPORT PREPARED BY: Brian Fitzgerald