BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 30, 2016 ALL TIMES ARE IN EASTERN STANDARD TIME SKIES CLEAR AS TEMPERATURES RISE INTO THE 60S After a partly cloudy start, skies have cleared with only a few cirrus and fair weather cumulus clouds remaining on the horizon. Temperatures, which had gotten down into the 30's overnight, have rebounded throughout the day climbing into the upper 60s by the 1 o'clock observation. Winds have decreased since this morning, remianing calm several times this morning. Humidities have dropped quickly from this morning leading to very dry conditions. Visibilities are low with hazy conditions. Today's Observations: 7 A.M. Weather: Scattered Cirrostratus Temperature: 45F; Dew Point: 34F; Wind: WSW at 6 kts, Sea-level pressure: 30.23 ins. Hg, rising, then more quickly Visibility: 50 miles 6-hr Max temp: 45F 6-hr Min temp: 39F 24-hr precip: 0.00 in. BHO SA 1155 180 SCT 50 238/45/34/2406/023/ WND LGT LGT DSNT HZ/ 8/005 53024 10045 20039 10 A.M. Weather: Few Cirrus, Few Cirrostratus Temperature: 57F; Dew Point: 31F; Wind: estimated SE at 4 kts, Wind: Light and variable Sea-level pressure: 30.20 ins. Hg, rising, then falling Visibility: 50 miles BHO SA 1455 CLR 50 229/57/31/E1304/020/FEW CI S-NW FEW CS NW WND L/V/ LGT DSNT HZ/ 8/009 58009 1 P.M. Weather: Few cumulus, few cirrostratus Temperature: 61F; Dew Point: 28F; Wind: E at 10 kts, Sea-level Pressure: 30.15 ins. HG, falling then more rapidly Visibility: 55 miles 6-hr Max temp: 61F 6-hr Min temp: 45F BHO SA 1755 CLR 55 219/61/28/0810/015/ FEW CU SW-NW FEW CS W LGT DSNT HZ 8/108 56010 10061 20045 SUMMARY FOR FRIDAY, APRIL 29, 2016 TEMPERATURE (DEGREES F) MAX.....56 NORMAL.....61 MIN.....39 NORMAL.....42 MEAN....48 NORMAL.....52 DEPARTURE FROM 30-YEAR NORMAL.........................-4 TOTAL DEPARTURE FOR THE MONTH........................-19 [-0.9] DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............17 DEPARTURE..........+4 TOTAL HEATING UNITS FOR THE MONTH.............558 DEPARTURE.........+20 TOTAL HEATING UNITS FOR THE SEASON...........4977 DEPARTURE.......-1045 TOTAL HEATING UNITS LAST SEASON TO DATE......6257 DIFFERENCE......-1280 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................20 ESE AT 3:37 P.M. ASOS........................19 SE AT 6:30 P.M. DAVIS.......................19 SE AT 6:10 P.M. RMY 20 FASTEST MILE FOR YESTERDAY.....................14 SE AT 6:34 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................14 SSE AT 8:44 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................14 SE AT 6:36 P.M. AVERAGE WIND SPEED AND DIRECTION...............8.0 ESE ASOS........................8.2 DAVIS.......................7.1 SE [125 Deg.] * last of several occurrences 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..........4.36 DEPARTURE......-0.05 (corrected) ASOS..............4.36 TOTAL PRECIPITATION FOR THE YEAR..........16.94 DEPARTURE......-1.47 (corrected) ASOS.............17.37 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.......-0.0 TOTAL SNOWFALL FOR THE MONTH...............15.0 DEPARTURE......+12.0 TOTAL SNOWFALL FOR THE SEASON..............57.5 DEPARTURE.......-5.7 PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 4/1 66/54/60/+19/0.06/0.0/092/12 39 SSW AERO N/A RMY 43 4/2 54/40/47/+6/0.47/0.0/023/03 23 SSW AERO N/A RMY N/A 4/3 40/23/32/-10/0.85/7.7/354/46 46 W AERO N/A RMY 55 4/4 28/21/25/-17/0.63/7.3/000/00 29 NNE AERO N/A RMY 25 4/5 35/19/27/-16/0.00/0.0/660/85 25 NW AERO N/A RMY 27 4/6 41/21/31/-12/T/0.0/483/62 44 S AERO N/A RMY N/A 4/7 56/41/49/+6/1.41/0.0/000/00 53 SSE AERO 59 SSE RMY 55 4/8 52/32/42/-2/T/0.0/353/45 41 WSW AERO 45 WSW RMY 42 4/9 47/29/38/-6/0.00/0.0/417/53 33 NW AERO 39 NW RMY 32 4/10 49/26/38/-7/0.00/0.0/735/93 30 NW AERO 32 NW RMY 31 4/11 58/40/49/+4/0.01/T/182/23 47 S AERO 52 S RMY N/A 4/12 59/37/48/+3/0.30/0.0/040/05 53 S AERO 60 S RMY 54 4/13 53/33/43/-3/0.00/0.0/798/100 21 NNW AERO 25 NNW RMY 21 4/14 48/33/41/-5/0.00/0.0/793/99 28 ENE AERO 28 NNE RMY 26 4/15 54/35/45/-2/0.00/0.0/804/100 26 NNE AERO 28 NNE RMY N/A 4/16 52/39/46/-1/0.00/0.0/783/97 36 NNE AERO 31 NNE RMY 34 4/17 62/36/49/+2/0.00/0.0/809/100 20 NNE AERO 20 NNE RMY 19 4/18 67/45/56/+8/0.00/0.0/715/88 28 ENE AERO 29 NE RMY 28 4/19 55/41/48/0/0.05/0.0/440/54 25 NW AERO 30 NW RMY N/A 4/20 57/41/49/0/0.00/0.0/801/98 29 NNW AERO 30 NNW RMY 29 4/21 76/38/57/+8/0.00/0.0/795/97 28 W AERO 29 WSW RMY 28 4/22 80/56/68/+19/0.03/0.0/313/38 36 S AERO 37 S RMY 36 4/23 60/46/53/+3/0.19/0.0/289/35 26 NNW AERO 60 NNW RMY 24 4/24 59/38/49/-1/0.00/0.0/770/93 23 NW AERO 25 NW RMY 24 4/25 63/41/52/+2/0.00/0.0/158/19 23 W AERO 24 W RMY N/A 4/26 52/35/44/-7/0.36/0.0/000/00 33 E AERO 35 E RMY 31 4/27 61/33/47/-4/0.00/0.0/761/91 28 S AERO 39 S RMY 29 4/28 60/37/49/-3/0.00/0.0/670/80 26 S AERO 30 S RMY 27 4/29 56/40/48/-4/0.00/0.0/563/67 20 ESE AERO 22 SE RMY 20 4/30 low temp since midnight is 39F; normal now 42F DAILY RECORDS FOR APRIL 2016 4/1/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 54F, BREAKS PREVIOUS RECORD OF 51F SET IN 1948 4/4/16: NEW DAILY RECORD SNOWFALL OF 7.3 INS, BREAKS PREVIOUS RECORD OF 3.7 INS SET IN 1975 4/4/16: NEW DAILY RECORD LOW MAXIMUM TEMPERATURE OF 28F, BREAKS PREVIOUS RECORD OF 32F SET AND TIED IN 1896, 1908, 1975 4/22/16: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 56F, BREAKS PREVIOUS RECORD OF 55F IN 1977 AND 1992 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 30 HIGH 86 IN 1942 LOW 30 IN 1931 PRECIP 1.41 IN 1991 SNOWFALL 0.3 IN. IN 1909 PEAK GUST 64e MPH NW IN 1978 RECORDS FOR MAY 1 HIGH 87F IN 1899 LOW 29F IN 1978 PRECIP 2.53 INCHES IN 1921 SNOWFALL TRACE IN 1905,1917,1921,1995. PEAK GUST 57 MPH NW IN 1974 TODAY'S REPORT PREPARED BY: Robert Millette