Time Zones and Units

All of the data collected by CDIP is archived by the UTC time. While some of our web products are available for other time zones, many of CDIP’s files and products are tagged only with the UTC time.

What is Universal Time Coordinated (UTC)?

UTC is the time at 0 degrees longitude, a.k.a. GMT (Greenwich Mean Time).

UTC = US Eastern Standard Time (EST) + 5 hours or UTC = US Pacific Standard Time (PST) + 8 hours

For US Daylight Savings Time the difference is 1 hour less, e.g.,

UTC = EDT + 4 hours UTC = PDT + 7 hours

For the state of Hawaii

UTC = Hawaiian Standard Time + 10 hours

World UTC Table

UTC time difference for various locations through out the world.

Local Time Geographic Zone
UTC-12 Eniwetok
UTC-11 Samoa
UTC-10 Hawaii
UTC-9 Alaska
UTC-8 PST, Pacific US
UTC-4 Atlantic, Canada
UTC-3 Brazil, Buenos Aries
UTC-2 Mid-Atlantic
UTC-1 Cape Verdes
UTC Greenwich Mean Time, Dublin
UTC+1 Berlin, Rome
UTC+2 Israel, Cairo
UTC+3 Moscow, Kuwait
UTC+4 Abu Dhabi, Muscat
UTC+5 Islamabad, Karachi
UTC+6 Almaty, Dhaka
UTC+7 Bangkok, Jakarta
UTC+8 Hong Kong, Beijing
UTC+9 Tokyo, Osaka
UTC+10 Sydney, Melbourne, Guam
UTC+11 Magadan, Soloman Is.
UTC+12 Fiji, Wellington, Auckland

PST,PDT Pacific Standard/Daylight Time
MST,MDT Mountain Standard/Daylight Time
CST,CDT Central Standard/Daylight Time
EST,EDT Eastern Standard/Daylight Time

Unit Conversions

CDIP archives its data in metric units. In the website’s Recent-Observed section - which displays the latest data from currently active stations - a number of products can be viewed using either English or metric units. On the nowcast swell models and forecast models English units are used, with wave heights measured in feet. Everywhere else on the site, metric units are used. Below is some conversion information that may help in interpreting data.

Length conversions

The primary unit of length used by CDIP is meters(m). To convert from
meters to feet, the formula is as follows: (feet) = 3.28 * (meters)

Meters to Feet Conversion Table

m ft
1 3.3
2 6.6
3 9.8
4 13.1
5 16.4
6 19.7
7 23.0
8 26.2
9 29.5
10 32.8
11 36.1
12 39.4

When describing station locations and on maps, distances may given in miles(mi), nautical miles(nm), or kilometers(km). The conversions between these units are as follows: 1 mi = 1.61 km = 0.87 nm

Temperature conversions

The temperature unit used by CDIP is degrees Celsius(C). To convert from Celsius to Farenheit(F), the formula is as follows: (F) = (9/5)*(C) + 32

Celcius to Farenheit Conversion Table

0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
55 131

Other conversions

  • Wind speed is archived in meters per second (m/s). 1 m/s = 1.94 knots = 2.24 miles per hour
  • Pressure is archived in millibars (mB). 1 mB = 0.0295 inches of Hg