BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 29, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME BOTH OUR RECORD HIGH MAXIMUM AND RECORD HIGH MINIMUM TEMPERATURES EQUALED YESTERDAY, TOTAL OF FIVE RECORDS EITHER EQUALED OR SURPASSED DURING PAST FOUR DAYS The maximum temperature of 92F (91.6) which was recorded yesterday afternoon around 2:30 P.M. EDT equaled the record high maximum for the date of 92F on April 28, 1990. The minimum temperature of 57F which occurred at midnight last night equaled the record high minimum temperature for the date which was 57F recorded on April 28, 1935. A total of five records have been equaled or surpassed starting with 83F on April 25. April 25...high temp. of 83F surpasses 80 in 1942 April 25...low temp. of 56F surpasses 55F in 1985 April 26...high temp. of 88F surpasses 83 in 1908 April 28...high temp. of 92F equals 92F in 1990 April 28...low temp. of 57F equals 57F in 1935 Today's observations: 7 A.M. Weather: Thin overcast cirrus, altocumulus distant SE-SW Temperature: 49F, Dew point: 28F, Wind: NNW at 10 kts Wind: Direction variability WNW to NNE Sea-level pressure: 30.45 inches Hg, rising Visibility: 60 miles, 70 miles northwest 6-hour min temp: 45F 6-hour precipitation: Trace BHO SA 1155 250 –BKN 300 –OVC 60 313/49/28/3410/045/ AC DSNT SE-SW VSBY NW 70 WND 30V02/ 8/041 51029 MANUAL 6000/ 10053 20045 10 A.M. Weather: Thin overcast cirrus Temperature: 53F, Dew point: 19F, Wind: NE at 12G18 kts, Wind: Direction variability N-E Sea-level pressure: 30.50 inches Hg, rising Visibility: 60 miles, 70 miles northwest BHO SA 1455 250 –OVC 60 329/53/19/0412G18/050/ VSBY NW 70 WND 01V08/ 8/007 51016 1 P.M. Weather: High thin overcast with cirrus and cirrostratus Temperature: 57F, Dew point: 13F, Wind: ENE at 7 kts Wind: Direction variability NNE-ESE Sea-level pressure: 30.47 inches Hg, falling Visibility: 60 miles, NW 70 miles 6-hourly max. temp: 58F BHO SA 1755 250 –OVC 60 317/57/13/0707/047/ VSBY NW 70 WND 03V12/ 8/007 58012 10058 20049 WEATHER SUMMARY FOR TUESDAY, APRIL 28 TEMPERATURE (DEGREES F) MAX.....92 NORMAL.....60 MIN.....57 NORMAL.....41 MEAN....75 NORMAL.....51 DEPARTURE FROM 30-YEAR NORMAL..........+24 TOTAL DEPARTURE FOR THE MONTH..........+96 [+3.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE......-14 TOTAL HEATING UNITS FOR THE MONTH...........456 DEPARTURE......-78 TOTAL HEATING UNITS FOR THE SEASON.........5874 DEPARTURE.....-124 TOTAL HEATING UNITS LAST SEASON TO DATE....5576 DIFFERENCE....+298 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............37 SSW AT 5:33 P.M. AEROVANE.............36 S AT 12:37 P.M. ASOS.................37 SSW AT 5:34 P.M. DAVIS................40 NW AT 10:58 P.M. FASTEST MILE FOR YESTERDAY..............29 S AT 12:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........29 SSW AT 12:38 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........31 SSW AT 12:37 P.M. AVERAGE WIND SPEED AND DIRECTION......18.5 SSW ASOS...............17.6 DAVIS..............18.7 SW [220 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace DEPARTURE....-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.53 DEPARTURE....+0.47 ASOS..............4.55 TOTAL PRECIPITATION FOR THE YEAR..........14.61 DEPARTURE....-3.08 ASOS.............15.68 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.2 DEPARTURE.....-2.7 TOTAL SNOWFALL FOR THE SEASON..............78.9 DEPARTURE.....19.1 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 4/1 43/31/38/-3/0.13/0/015/02 24 SE 4/2 52/39/46/+4/0.02/0/000/00 20 SSE 4/3 58/45/52/+10/0.70//000/00 39 SSE AERO 38 MPH SSE TSTM 4/4 51/38/45/+3/0.01/0/015/02 48 WSW AERO 48 MPH WSW 4/5 58/37/48/+5/0/0/551/71 40 W AERO 37 MPH W 4/6 55/38/47/+4/1.42/0/047/006 42 SE AERO 40 MPH SE TSTM 4/7 50/34/42/-1/T/0/109/14 36 WSW AERO 35 MPH WSW 4/8 45/32/39/-5/0/0/149/19 33 SW AERO 31 MPH SW 4/9 60/34/47/+3/0/0/692/88 36 SSW AERO 33 MPH SSW 4/10 65/41/53/+9/0.18/0/544/69 37 SSW AERO 35 MPH SSW 4/11 44/33/39/-6/0.77/0.2/000/00 35 N AERO 30 MPH N 4/12 43/29/36/-9/0/0/541/68 45 NW AERO 43 MPH WNW 4/13 52/29/41/-4/0/0/734/92 38 W AERO 35 MPH W 4/14 58/37/48/+2/0/0/696/87 25 E 4/15 49/36/43/-3/0/0/650/81 35 NE AERO 31 MPH NE 4/16 50/34/42/-4/0/0/806/100 29 NNE 4/17 69/35/52/+5/0/0/695/86 37 W AERO 33 MPH W 4/18 64/44/54/+7/0.05/0/170/21 28 W 4/19 52/38/45/-2/0.03/0/773/95 33 NNE AERO 28 MPH NNE 4/20 51/36/44/-4/0.10/0/.../... 43 E AERO 39 MPH E 4/21 58/42/50/+2/0.95/0/000/00 43 E AERO 43 MPH S 4/22 62/45/54/+5/0.16/0/.../.. 28 S 4/23 56/40/48/-1/0.01/0/.../.. 43 W 4/24 70/40/55/+6/0/0/.../.. 30 W 4/25 83/49/66/+16/T/0/.../.. 29 S 4/26 88/56/72/+22/0/0/.../.. 33 NE 4/27 72/49/61/+11/0/0/.../.. 4/28 92/57/75/+24/0/0/.../.. 37 SSW AERO 36 MPH S 4/29 morning low temperature 45F; our normal low is now 41F NEW DAILY RECORDS FOR APRIL 2009... New record high maximum temperature for April 25 of 83F surpasses 80F in 1942. New record high maximum temperature for April 26 of 88F surpasses 83F in 1908. New record high minimum temperature for April 26 of 56F surpasses 55F in 1985. Maximum temperature of 92F for April 28 equals record high maximum of 92F in 1990. Minimum temperature of 57F for April 28 equals record high minimum of 57F in 1935. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 29 HIGH 85 IN 1974 LOW 26 IN 1909 PRECIP 1.65 IN 1923 SNOWFALL 1.0 IN. IN 1987 PEAK GUST 54 MPH WSW IN 1981 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 TODAY'S REPORT PREPARED BY: Robert Skilling/Stephanie Radner