BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY CLIMATE SUMMARY THURSDAY, MAY 12, 2005 ALL TIMES EASTERN DAYLIGHT TIME UNLESS OTHERWISE NOTED TODAY'S DISCUSSION.... MUCH COOLER AND VERY DRY WITH GUSTY NW WINDS TODAY.... Much cooler and very dry air arriving today after a high of 75 degrees yesterday. Early this afternoon with sunshine through just some very thin high cloudiness the temperature was being held in the upper 50's while dewpoints had dropped to the mid and upper teens from the 40's early this morning. Our relative humidity was down near 20% with northwest winds gusting 30 to 38 mph.. Tomorrow morning's record low temp. is 35 degrees set in 1914, we may be close to that record low but seems unlikely that we would break it. TODAY'S OBSERVATIONS 5/12/2005 THU 8 a.m. scattered clouds with 40 miles visibility; temp. 56; dewpoint 45; wind wnw 17 gusting 35 mph; six hourly min. temp. 51 deg. BHO SA 1155 20 SCT 70 SCT 85 SCT 300 SCT 40 164/56/45/3015G30/001/ AC/FEW ACSL NE-E VSBY E-SE 25 PK WND 3130/51/ WND 27V34/ 8/541 53042 10058 20051 11 a.m. high very thin overcast with 60 miles visibility; temp. 56; dewpoint 34; wind nw at 21 gusting 33 mph with a peak gust to 38 mph wnw during past hour... BHO SA 1455 350 -OVC 60 197/56/34/3118G29/011/ CS OVC VRY THN PK WND 2933/18/ WND 27V36/ 8/007 51033 2 p.m. high thin overcast with 70 miles visibility; temp. 58; dewpoint 16; rh 19%; wind nnw 22 gusting 37 mph; six hourly max. temp. 59 deg; six hourly min. temp. 55 deg. BHO SA 1755 250 -SCT 300 -OVC 70 210/58/16/3319G32/015/ PK WND 3332/54/ WND 28V36/ 8/007 53013 10059 20055 WEATHER SUMMARY FOR WEDNESDAY MAY 11: TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....65 HAZEN 75.0 @ 2:28 p.m. MIN.....46 NORMAL.....45 HAZEN 46.0 @ 5:19 a.m. MEAN....61 NORMAL.....55 DEPARTURE FROM 30-YEAR NORMAL...... + 6 TOTAL DEPARTURE FOR MAY.............- 44 [for the month, -4.2 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING TOTAL PRECIPITATION 24 HRS ENDING 8 A.M.....0.00 DEPARTURE....-0.12 TOTAL PRECIPITATION FOR MAY.................1.72 DEPARTURE....+0.35 PRECIPITATION FOR ASOS 24 HRS ENDING 8 A.M..0.00 ASOS FOR THE MONTH OF MAY........... .......1.67 TOTAL PRECIPITATION FOR THE YEAR........ .22.81 DEPARTURE....+3.64 TOTAL FOR ASOS FOR THE YEAR.............. .21.70 TOTAL SNOWFALL FOR APRIL ................. 0.2 DEPARTURE....- 2.9 TOTAL SNOWFALL FOR THE SEASON.............119.4 DEPARTURE.....+59.4 YESTERDAY'S PEAK GUSTS AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........27 S AT 5:41 P.M. AEROVANE.........28 S AT 5:41 P.M. ASOS.............24 S AT 5:41 P.M. DAVIS............27 S AT 5:42 P.M. FASTEST MILE FOR YESTERDAY......... 20 S AT 5:42 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......21 S AT 5:42 P.M. MAXIMUM 1-MINUTE DAVIS AVERAGE......22 S AT 5:43 P.M. YESTERDAY'S AVERAGE WIND SPEEDS..... OUR AVERAGE SPEED AND DIRECTION.....13.3 S ASOS AVERAGE AND DIRECTION..........14.1 S [180 deg] DAVIS AVERAGE AND DIRECTION.........13.7 S [180 deg] THE PRELIMINARY CLIMATE SUMMARY FOR MAY 2005...... CALENDAR DAY DATA DATA REPORTED HERE ENDING MIDNIGHT STANDARD TIME DATE MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 5/1 57/44/51/-1/0.14/118/14 33 MPH WNW 5/2 63/39/51/-1/0.05/593/70 43 MPH S 5/3 58/38/48/-5/0/604/71 30 MPH WSW 5/4 59/40/50/-3/T/400/47 21 MPH E 5/5 60/38/49/-4/0/777/91 23 MPH E 5/6 54/42/48/-6/0.08/103/12 26 MPH NNE 5/7 44/39/42/-12/1.19/000/00 58 MPH N 5/8 47/39/43/-11/0.22/000/00 43 MPH NNW 5/9 52/43/48/-7/0.04/026/03 36 MPH N 5/10 64/46/55/0/0/.../.. 20 MPH E 5/11 75/46/61/+6/0/.../.. 27 MPH S 5/12 morning low 51 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 12 HIGH 88F IN 2001 LOW 29F IN 1907 PRECIP 1.49 INCHES IN 1968 PEAK GUST 76 MPH S IN 1974 RECORDS FOR MAY 13 HIGH 85F IN 1947 LOW 35F IN 1914 PRECIP 2.05 INCHES IN 1975 PEAK GUST 49 MPH NNW IN 1965 Today's report by: Robert Skilling