BWS Daily Climatology Written Summary

BWS Daily Climatology Table One

BWS Daily Climatology Table Two

BWS Daily Climatology Graphs

May 1 2015 to May 23 2015


(Compiled: Sunday, May 24, 2015 18:01)

Written Summary   Table One   Table Two   Graphs  
Notes:
1. Mean daily temperature and pressure are averaged from the standard 24 hourly observations and not as the average of the maximum and minimum values.
2. Precipitation day has = or >0.01". Trace amounts (< 0.01") are not included in data.
3. Departures from the normal are based on the 1971 to 2000 normals where available (with the exception of the Sea Surface Temperature, which is based on the 1985 to 2000 normal).
Notes:
1. Mean humidity is averaged from the standard 24 hourly observations.
2. Weather Notes indicate a specific condition was observed at least once that day.
3. Departures from the normal are based on the 1971 to 2000 normals where available (with the exception of the Sea Surface Temperature, which is based on the 1985 to 2000 normal).
Key:
PN = Precipitation, PC = Partly Cloudy, MC = Mostly Cloudy, OV = Overcast, DZ = Drizzle, SH = Showers, BS = Blowing Spray GR = Hail, FC = Funnel Cloud, HZ = Haze, RA = Rain, BR = Mist, TS = Thunder Storm/Shower
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Midnight thunder greets May. Early Subtropical/Tropical Storm Ana forms/stays near Carolina coast from 8th.


Last edited: Sunday, May 24, 2015

May began with a few overnight thunderstorms and a period of low ceilings, rain and showers into the early morning hours (0.03" additional), as a low approached from the west. Winds picked up to near gale-force for a period mid-morning as the low quickly deepened over Bermuda and moved east. The high reached 73F/23C with a low of 68F/20C and 9.4 sun hours. Saturday the 2nd saw a low pressure pass to our north that brought mainly fine conditions with 11.9 hours of sunshine with a trace of rainfall and strong winds with a peak wind of 34 knots. The high was 76F/25C with a low of 66F/19C. Sunday the 3rd saw high pressure that slowly built over the area, producing 11.0 hours of sunshine with a trace of rainfall and a peak wind of 34 knots. The high was 72F/22C with a low of 67F/19C. High pressure dominated the 4th with 11.9 hours of sunshine. The high was 72F/22C with a low of 64F/18C. The 5th once again saw high pressure dominate with 7.2 hours of sunshine. The high was 72F/22C with a low of 63F/17C. Although mild conditions continued on the 6th, mid and high-level cloud cover increased as outflow from a developing low southeast of the Carolinas only allowed for 4.1 hours of sunshine. No precipitation was recorded with a high of 74F/23C and a low of 67F/19C. The distant low became Subtropical Storm Ana overnight on the 7th, but fair and cloudy conditions remained over Bermuda with no precipitation and 2.9 hours of sunshine. The high reached 73F/23C with a low of 66F/19C. The 8th brought developing rain in a convergent airmass between distant Ana to the west and high pressure to the east. An upper trough spawned a few late-night thunderstorms after a high of 75F/24C and a low of 68F/20C. There were 0.9 hours of sun and 0.63" of precipitation. Light southeasterlies held on the 9th with a SFC high building from the northeast, with no rain, a high of 75F/24C, a low of 69F/21C and 9.9 hours of sunshine. High pressure continued settled conditions for Sunday the 10th with mainly light winds, a high of 75F/24C, a low of 70F/21C, and 4.9 hours of sunshine. Monday the 11th saw similar conditions as high pressure persisted. The high was 75F/24C with a low of 69F/21C and 12.1 hours of sunshine. Tuesday the 12th saw high pressure maintain over the area producing fine conditions with 12.1 hours of sunshine and no rainfall. The high was 75F/24C with a low of 69F/20C. As the high slowly retreated from the area, Wednesday the 13th saw mainly fine conditions with 9.8 hours of sunshine with no rainfall. The high was 78F/25C with a low of 70F/21C. A front pushed through on the morning of the 14th producing 0.16" of precipitation. Cloud cover parted for 4.7 hours of sunshine, with a high temperature of 76F/24C and a low 68F/20C. High pressure began to build in on the 15th with 10.5 hours of sunshine and no rainfall. The high reached 73F/23C with a low of 67F/20C. On the 16th the SFC high held to our west-northwest with moderate northerly winds, no rain and 11.8 sun hours. The high was 73F/23C with a low of 67F/19C. Little changed in the local synoptic pattern on the 17th, with northerly winds easing light after a high of 74F/23C a low of 67F/19C and 10.6 hours of sunshine. The 18th saw a frontal boundary push across Bermuda, with cloudy conditions and showers producing 0.11" of rainfall. The high was 74F/23C with a low of 69F/20C and 0.3 hours of sunshine. High pressure dominated the 19th, with 11.9 hours of sunshine. The high was 75F/24C with a low of 68F/20C. High pressure continued to hold across the area, dominating the weather Wednesday the 20th and Thursday the 21st. Wednesday saw 7.2 hours of sunshine while Thursday had 11.0 hours. No rainfall either day. The high Wednesday was 77F/25C with a low of 69F/20C. Thursday high was 80F/26C with a low of 71F/22C. Showers began to develop overnight ahead of an approaching frontal boundary on the 22nd, bringing 0.10" of precipitation. The high reached 79F/26C with a low of 72F/22C and 10.4 hours of sunshine. A couple light showers then lingered in the early morning as the front pushed through on the 23rd producing 0.02" of rainfall. The high was 78F/25C with a low of 71F/22C and 7.3 hours of sunshine.

Produced by the Bermuda Weather Service
Unless otherwise stated, all statistical data are based on observations taken at the Bermuda International Airport.
 Mean Temp.
(°C/°F)
Max Temp.
(°C/°F)
Min Temp.
(°C/°F)
Daily Precip.
Inches
Accumulated Precip.
Inches
Year To Date Precip.
Inches
Sea Surface Temp.
(C/F)
Mean
Sea Level Pressure
" Hg / hPa
Total   1.05    
Mean21.8 / 71.223.8 / 74.820.0 / 68.0   22.7 / 72.930.16 / 1021.0
Departure
From Norm.
-0.6 / -1.1-0.9 / -1.60.1 / 0.1-1.96  0.3 / 0.5 
Max23.8 / 74.926.4 / 79.5 0.63  23.8 / 74.830.37 / 1028.4
Min19.9 / 67.9 17.0 / 62.6   21.6 / 70.929.71 / 1006.1
 Mean Temp.
(°C/°F)
Max Temp.
(°C/°F)
Min Temp.
(°C/°F)
Daily Precip.
Inches
Accumulated Precip.
Inches
Year To Date Precip.
Inches
Sea Surface Temp.
(C/F)
Mean
Sea Level Pressure
" Hg / hPa
5/1/201521.4 / 70.522.5 / 72.519.8 / 67.60.030.0320.0421.6 / 70.929.71 / 1006.1
5/2/201521.5 / 70.724.5 / 76.119.1 / 66.40.000.0320.0421.6 / 70.929.76 / 1007.8
5/3/201520.8 / 69.422.3 / 72.119.2 / 66.60.000.0320.0421.6 / 70.929.97 / 1014.9
5/4/201520.0 / 68.122.3 / 72.117.6 / 63.70.000.0320.0421.6 / 70.930.29 / 1025.7
5/5/201519.9 / 67.922.4 / 72.317.0 / 62.60.000.0320.0421.9 / 71.430.37 / 1028.4
5/6/201521.0 / 69.923.2 / 73.819.4 / 66.90.000.0320.0421.9 / 71.430.28 / 1025.4
5/7/201521.4 / 70.622.9 / 73.219.1 / 66.40.000.0320.0421.9 / 71.430.21 / 1023.0
5/8/201521.7 / 71.123.6 / 74.520.0 / 68.00.630.6620.6721.9 / 71.430.20 / 1022.7
5/9/201522.3 / 72.224.1 / 75.420.9 / 69.60.000.6620.6721.9 / 71.430.29 / 1025.7
5/10/201522.1 / 71.824.0 / 75.221.2 / 70.20.000.6620.6721.9 / 71.430.36 / 1028.1
5/11/201522.0 / 71.723.6 / 74.520.8 / 69.40.000.6620.6721.9 / 71.430.37 / 1028.4
5/12/201522.1 / 71.824.1 / 75.420.4 / 68.70.000.6620.6723.8 / 74.830.31 / 1026.4
5/13/201523.0 / 73.425.3 / 77.520.9 / 69.60.000.6620.6723.8 / 74.830.17 / 1021.7
5/14/201521.8 / 71.224.2 / 75.619.9 / 67.80.160.8220.8323.8 / 74.830.11 / 1019.6
5/15/201520.7 / 69.222.5 / 72.519.6 / 67.30.000.8220.8323.8 / 74.830.17 / 1021.7
5/16/201520.6 / 69.022.5 / 72.519.3 / 66.70.000.8220.8323.8 / 74.830.25 / 1024.4
5/17/201521.0 / 69.923.2 / 73.819.3 / 66.70.000.8220.8323.8 / 74.830.26 / 1024.7
5/18/201521.7 / 71.023.4 / 74.120.5 / 68.90.110.9320.9423.1 / 73.630.04 / 1017.3
5/19/201522.0 / 71.624.1 / 75.420.5 / 68.90.000.9320.9423.1 / 73.629.98 / 1015.2
5/20/201522.8 / 73.124.9 / 76.820.3 / 68.50.000.9320.9423.1 / 73.629.99 / 1015.6
5/21/201523.6 / 74.526.4 / 79.521.5 / 70.70.000.9320.9423.7 / 74.730.04 / 1017.3
5/22/201523.8 / 74.925.9 / 78.622.2 / 72.00.101.0321.0423.7 / 74.730.16 / 1021.3
5/23/201523.3 / 74.025.4 / 77.721.5 / 70.70.021.0521.0623.7 / 74.730.28 / 1025.4
 Hours Of
Sunshine
Mean
R.H.
%
Absolute
Max. R.H.
%
Absolute
Min. R.H.
%
Max Of
Mean Wind
knots / °
Peak
Wind
knots / °
Sky Conditions / Weather Notes
PN PC MC OV DZ SH RA GR TS FC HZ BS BR
Total193.8         
6192211183010000
Mean8.473.583.063.0      
             
Departure
From Norm.
          
-5            
Max12.1 92.0 33  41  
             
Min0.3  48.0      
             
 Hours Of
Sunshine
Mean
R.H.
%
Absolute
Max. R.H.
%
Absolute
Min. R.H.
%
Max Of
Mean Wind
knots / °
Peak
Wind
knots / °
Sky Conditions / Weather Notes
PN PC MC OV DZ SH RA GR TS FC HZ BS BR
5/1/20159.479.3907233 / 25041 / 250
PNMCOVSH
5/2/201511.972.4845926 / 25034 / 250
PCMCSH
5/3/20151173.2806726 / 30034 / 300
PCMCSH
5/4/201511.961.1775015 / 5021 / 50
PCMC
5/5/20157.264.4755311 / 13018 / 110
PCMCOV
5/6/20154.169.6795710 / 19013 / 160
MCOV
5/7/20152.980897113 / 17015 / 160
MCOV
5/8/20150.988.9928017 / 18020 / 180
PNMCOVSHRATS
5/9/20159.984.2927810 / 21014 / 140
PCMCOV
5/10/20154.980.9857414 / 14016 / 140
PCMC
5/11/201512.173.9836710 / 20012 / 200
PC
5/12/201512.171.8776414 / 23016 / 230
PCMC
5/13/20159.878.8887018 / 20021 / 210
PCMC
5/14/20154.774.3895317 / 31026 / 310
PNPCMCOVDZSHRA
5/15/201510.560.4734918 / 03026 / 030
PCMC
5/16/201511.857.2645015 / 01023 / 030
PCMC
5/17/201510.658.5724813 / 01019 / 010
PCMC
5/18/20150.375.2876524 / 30032 / 300
PNPCMCOVSHRA
5/19/201511.969.8765914 / 02021 / 360
PCMC
5/20/20157.273.7865917 / 25021 / 250
PCMCOV
5/21/20151179906518 / 27024 / 260
PCMC
5/22/201510.484.7917517 / 24024 / 220
PNPCMCOVSH
5/23/20157.378.7906413 / 04021 / 040
PNPCMCOVSH