National Climatic Data Center (Continued) 
Summary of Synoptic Meteorological Observations (Area of World) 
Coastal Marine Areas 
Publication Date: 1970 and after 
Location: 500 selected marine areas throughout world 
Period of Coverage: N/A 
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Contents: This serial publication is produced by a joint effort of the Naval 
Weather Service's Detachment at Asheville, N. C., and NOAA's National Climatic 
Data Center and is based upon marine surface observations taken aboard vessels 
of varying registry in passages. Since ships tend to avoid bad weather when 
possible, the data may contain a bias toward good weather. There are 21 data 
tables for each coastal marine area. Tables 1-19 are prepared for each 
calendar month, with an annual summary for each. Tables 20 and 21 contain 
both monthly and annual summaries. Because the number of observations may 
vary from one table to another, no absolute relationship exists between the 
tables. The period of record used in each volume is indicated. The tables 
presented (described below) are based upon eight observation times per day 
(Greenwich Mean Time (GMT)). 
Table 1 - Percent frequency of weather occurrence by wind direction. 
Table 2 - Percent frequency of weather occurrence by hour. 
Table 3 - Percent frequency of wind direction by speed and by hour and 
hour groups; the mean wind speed by direction is also shown. 
Table 4 - Percent frequency of wind speed by hour and mean speed by 
hour. 
Table 5 - Percent frequency of total cloud amount by wind direction and 
the mean cloud amount by wind direction. 
Table 6 - Percent frequency of ceiling heights and no ceiling by wind 
direction. 
Table 7 — Cumulative percent frequency of simultaneous occurrence of 
ceiling height and visibility, and percent frequency of low 
clouds. 
Table 8 —- Percent frequency of wind direction versus occurrence or non- 
occurrence of precipitation and varying of visibility. 
Table 9 - Percent frequency of wind direction versus wind speed with 
varying values of visibility. 
Table 10 - Percent frequency of ceiling heights and no ceiling by hour. 
Table 11 - Percent frequency of visibility by hour. 
Table 12 - Cumulative percent frequency of ranges of visibility and 
ceiling height by hour. 
Table 13 - Percent frequency of relative humidity by air temperature. 
Table 14 - Percent frequency of wind direction by air temperature. 
Table 15 - Means, extremes, and percentiles of air temperature by hour. 
Table 16 - Percent frequency of relative humidity by hour. 
Table 17 - Percent frequency of air temperature and the occurrence of fog 
(without precipitation) versus air-sea temperature difference. 
