Unit Explanations
The parameter units in the point request can be set to english, metric, or raw. Here is a lookup list of what units and precision those values will return.
English units
FORECAST VARIABLES
Temperature
Fahrenheit rounded to the nearest degree
Feels Like
Fahrenheit rounded to the nearest degree
Dewpoint
Fahrenheit rounded to the nearest degree
Relative Humidity
percentage rounded to the nearest 1% (0-100%)
Wind_Direction (10m, 60m, 120m)
Degrees rounded to the nearest degree (0-359) North is 0, East is 90, South is 180, and West is 270
Wind_Speed (10m, 60m, 120m)
Miles per hour rounded to the nearest mph
Wind_Gust
Miles per hour rounded to the nearest mph
Clouds
This is a derived value based on the overall cloudiness of a location by taking various relative humidity samples throughout the atmospheric column.
| 0-5 | Clear |
| 5-20 | Mostly Clear |
| 20-70 | Partly Cloudy |
| 70-90 | Mostly Cloudy |
| >90 | Cloudy |
Accumulated Rain
Inches rounded to the nearest hundredth of an inch
Accumulated Snow
Inches rounded to the nearest tenth of an inch
Accumulated Ice
Inches rounded to the nearest hundredth of an inch
Supercell Index
1-100 index rounded to the nearest digit
Traffic Index 1-100 index rounded to the nearest digit
High Clouds
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds1
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds2
percentage rounded to the nearest 1% (0-100%)
Low Clouds
percentage rounded to the nearest 1% (0-100%)
Wave Height
Feet to the nearest tenth of a foot
Wave Period
Seconds rounded to the nearest second
Wind Direction
Degrees rounded to the nearest degree
Primary Wave Period
Seconds rounded to the nearest second
Primary Wind Direction
Degrees rounded to the nearest degree
RADAR VARIABLES
Precip Type
| PrecipType Value | Precipitation Type |
| 0 | No Precip |
| 1 | Rain |
| 2 | Freezing Rain |
| 3 | Freezing Rain/Snow |
| 4 | Rain/Snow |
| 5 | Snow |
| 6 | Sleet |
Reflectivity
decibels rounded to the nearest digit
|
Level2 Reflectivity
decibels rounded to the nearest digit
|
UV Index
This is a derived value that takes clouds and local conditions into account when forecasting how much UV radiation will reach the earth’s surface. It is a unitless value that expresses the level of exposure to harmful UV radiation.
0-2 |
Good |
3-5 |
Moderate |
6-7 |
High |
8-10 |
Very High |
11+ |
Extreme |
Hailvision
Inches rounded to the nearest hundredth of an inch
Rainvision
Inches rounded to the nearest hundredth of an inch
Snowvision
Inches rounded to the nearest hundredth of an inch
Icevision
Inches rounded to the nearest hundredth of an inch
CLIMATOLOGY VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Precipitation Statistics
inches rounded to the nearest hundredth of an inch
Wind Statistics
miles per hour rounded to the nearest mph
Heating/Cooling Degree Day Statistics
Fahrenheit rounded to the nearest degree
AQI VARIABLES
Ozone Index
This is a unitless index that expresses the amount of ground-level ozone, which can be harmful to the lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
PM2.5 Index
This is a unitless index that expresses the amount of particle pollution at the surface, which can be harmful to the heart and lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
AIRPORT VARIABLES
Delay Times
Minutes rounded to nearest minute.
ALMANAC VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Precipitation Statistics
inches rounded to the nearest hundredth of an inch
Wind Statistics
miles per hour rounded to the nearest mph
Heating/Cooling Degree Day Statistics
Fahrenheit rounded to the nearest degree
Relative Humidity Statistics
percentage rounded to the nearest percent
Possible Sunshine Statistics
percentage rounded to the nearest percent
ALMANAC VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Precipitation Statistics
millimeters rounded to the nearest tenth of a mm
Wind Statistics
meters per second rounded to the nearest m/s
Heating/Cooling Degree Day Statistics
Celsius rounded to the nearest tenth of a degree
Relative Humidity Statistics
percentage rounded to the nearest percent
Possible Sunshine Statistics
percentage rounded to the nearest percent
BUOY VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Wind Statistics
miles per hour rounded to the nearest mph
Wave Height
feet rounded to the nearest tenth of a foot
Pressure Statistics
inches of Mercury to the nearest 1/100th of an inch
TIDE VARIABLES
Tide Height
feet rounded to the nearest tenth of a foot
Metric units
FORECAST VARIABLES
Temperature
Celsius rounded to the nearest tenth of a degree
Feels Like
Celsius rounded to the nearest tenth of a degree
Dewpoint
Celsius rounded to the nearest tenth of a degree
Relative Humidity
percentage rounded to the nearest 1% (0-100%)
Wind_Direction (10m, 60m, 120m)
Degrees rounded to the nearest degree (0-359) North is 0, East is 90, South is 180, and West is 270
Wind_Speed (10m, 60m, 120m)
meters per second rounded to the nearest m/s
Wind_Gust
meters per second rounded to the nearest m/s
Clouds
This is a derived value based on the overall cloudiness of a location by taking various relative humidity samples throughout the atmospheric column.
| 0-5 | Clear |
| 5-20 | Mostly Clear |
| 20-70 | Partly Cloudy |
| 70-90 | Mostly Cloudy |
| >90 | Cloudy |
Accumulated Rain
millimeters rounded to the nearest mm
Accumulated Snow
centimeters rounded to the nearest cm
Accumulated Ice
millimeters rounded to the nearest mm
Supercell Index
1-100 index rounded to the nearest digit
Traffic Index
1-100 index rounded to the nearest digit
High Clouds
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds1
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds2
percentage rounded to the nearest 1% (0-100%)
Low Clouds
percentage rounded to the nearest 1% (0-100%)
Wave Height
Meters to the nearest tenth of a meter
Wave Period
Seconds rounded to the nearest second
Wind Direction
Degrees rounded to the nearest degree
Primary Wave Period
Seconds rounded to the nearest second
Degrees rounded to the nearest degree
RADAR VARIABLES
Precip Type
| PrecipType Value | Precipitation Type |
| 0 | No Precip |
| 1 | Rain |
| 2 | Freezing Rain |
| 3 | Freezing Rain/Snow |
| 4 | Rain/Snow |
| 5 | Snow |
| 6 | Sleet |
Reflectivity
decibels rounded to the nearest digit
|
Level2 Reflectivity
decibels rounded to the nearest digit
|
UV Index
This is a derived value that takes clouds and local conditions into account when forecasting how much UV radiation will reach the earth’s surface. It is a unitless value that expresses the level of exposure to harmful UV radiation.
0-2 |
Good |
3-5 |
Moderate |
6-7 |
High |
8-10 |
Very High |
11+ |
Extreme |
Hailvision
millimeters rounded to the nearest digit
Rainvision
millimeters rounded to the nearest digit
Snowvision
millimeters rounded to the nearest digit
Icevision
millimeters rounded to the nearest digit
CLIMATOLOGY VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Precipitation Statistics
millimeters rounded to the nearest tenth of a mm
Wind Statistics
meters per second rounded to the nearest m/s
Heating/Cooling Degree Day Statistics
Celsius rounded to the nearest tenth of a degree
AQI VARIABLES
Ozone Index
This is a unitless index that expresses the amount of ground-level ozone, which can be harmful to the lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
PM2.5 Index
This is a unitless index that expresses the amount of particle pollution at the surface, which can be harmful to the heart and lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
AIRPORT VARIABLES
Delay Times
Minutes rounded to nearest minute.
ALMANAC VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Precipitation Statistics
millimeters rounded to the nearest tenth of a mm
Wind Statistics
meters per second rounded to the nearest m/s
Heating/Cooling Degree Day Statistics
Celsius rounded to the nearest tenth of a degree
Relative Humidity Statistics
percentage rounded to the nearest percent
Possible Sunshine Statistics
percentage rounded to the nearest percent
BUOY VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Wind Statistics
meters per second rounded to the nearest m/s
Wave Height
centimeters rounded to the nearest cm
pascals rounded to the nearest Pa
TIDE VARIABLES
Tide Height
meters rounded to the nearest tenth of a meter
METRIC ALTERNATIVE1 UNITS
FORECAST VARIABLES
Temperature
Celsius rounded to the nearest tenth of a degree
Feels Like
Celsius rounded to the nearest tenth of a degree
Dewpoint
Celsius rounded to the nearest tenth of a degree
Relative Humidity
percentage rounded to the nearest 1% (0-100%)
Wind_Direction (10m, 60m, 120m)
Degrees rounded to the nearest degree (0-359) North is 0, East is 90, South is 180, and West is 270
Wind_Speed (10m, 60m, 120m)
kilometers per hour rounded to the nearest km/h
Wind_Gust
kilometers per hour rounded to the nearest km/h
This is a derived value based on the overall cloudiness of a location by taking various relative humidity samples throughout the atmospheric column.
| 0-5 | Clear |
| 5-20 | Mostly Clear |
| 20-70 | Partly Cloudy |
| 70-90 | Mostly Cloudy |
| >90 | Cloudy |
Accumulated Rain
millimeters rounded to the nearest mm
Accumulated Snow
centimeters rounded to the nearest cm
Accumulated Ice
millimeters rounded to the nearest mm
Supercell Index
1-100 index rounded to the nearest digit
Traffic Index
1-100 index rounded to the nearest digit
High Clouds
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds1
percentage rounded to the nearest 1% (0-100%)
Mid Level Clouds2
percentage rounded to the nearest 1% (0-100%)
Low Clouds
percentage rounded to the nearest 1% (0-100%)
Probability of Precipitation
percentage rounded to the nearest 1% (0-100%)
RADAR VARIABLES
Precip Type
| PrecipType Value | Precipitation Type |
| 0 | No Precip |
| 1 | Rain |
| 2 | Freezing Rain |
| 3 | Freezing Rain/Snow |
| 4 | Rain/Snow |
| 5 | Snow |
| 6 | Sleet |
Reflectivity
decibels rounded to the nearest digit
|
Level2 Reflectivity
decibels rounded to the nearest digit
|
UV Index
This is a derived value that takes clouds and local conditions into account when forecasting how much UV radiation will reach the earth’s surface. It is a unitless value that expresses the level of exposure to harmful UV radiation.
0-2 |
Good |
3-5 |
Moderate |
6-7 |
High |
8-10 |
Very High |
11+ |
Extreme |
Hailvision
millimeters rounded to the nearest digit
Rainvision
millimeters rounded to the nearest digit
Snowvision
millimeters rounded to the nearest digit
Icevision
millimeters rounded to the nearest digit
CLIMATOLOGY VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Precipitation Statistics
millimeters rounded to the nearest tenth of a mm
Wind Statistics
meters per second rounded to the nearest m/s
Heating/Cooling Degree Day Statistics
Celsius rounded to the nearest tenth of a degree
AQI VARIABLES
Ozone Index
This is a unitless index that expresses the amount of ground-level ozone, which can be harmful to the lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
PM2.5 Index
This is a unitless index that expresses the amount of particle pollution at the surface, which can be harmful to the heart and lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
AIRPORT VARIABLES
Delay Times
Minutes rounded to nearest minute.
ALMANAC VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Precipitation Statistics
millimeters rounded to the nearest tenth of a mm
Wind Statistics
meters per second rounded to the nearest m/s
Heating/Cooling Degree Day Statistics
Celsius rounded to the nearest tenth of a degree
Relative Humidity Statistics
percentage rounded to the nearest percent
Possible Sunshine Statistics
percentage rounded to the nearest percent
BUOY VARIABLES
Temperature Statistics
Celsius rounded to the nearest tenth of a degree
Wind Statistics
meters per second rounded to the nearest m/s
Wave Height
centimeters rounded to the nearest cm
Pressure Statistics
pascals rounded to the nearest Pa
TIDE VARIABLES
Tide Height
meters rounded to the nearest tenth of a meter
Raw units
FORECAST VARIABLES
Temperature
Kelvin rounded to the nearest thousandth of a degree
Feels Like
Kelvin rounded to the nearest thousandth of a degree
Dewpoint
Kelvin rounded to the nearest thousandth of a degree
Relative Humidity
percentage rounded to the nearest hundredth of a percent (0-100%)
Wind_Direction (10m, 60m, 120m)
Radians rounded to the thousandth (0-2pi)
Wind_Speed (10m, 60m, 120m)
meters per second rounded to the nearest thousandth m/s
Wind_Gust
meters per second rounded to the nearest thousandth m/s
Clouds
This is a derived value based on the overall cloudiness of a location by taking various relative humidity samples throughout the atmospheric column.
| 0-5 | Clear |
| 5-20 | Mostly Clear |
| 20-70 | Partly Cloudy |
| 70-90 | Mostly Cloudy |
| >90 | Cloudy |
Accumulated Rain
Inches rounded to the nearest thousandth of an inch
Accumulated Snow
Inches rounded to the nearest thousandth of an inch
Accumulated Ice
Inches rounded to the nearest thousandth of an inch
Supercell Index
1-100 index rounded to the nearest digit
Traffic Index
1-100 index rounded to the nearest digit
High Clouds
percentage rounded to the nearest hundredth of a 1% (0-100%)
Mid Level Clouds1
percentage rounded to the nearest hundredth of a 1% (0-100%)
Mid Level Clouds2
percentage rounded to the nearest hundredth of a 1% (0-100%)
Low Clouds
percentage rounded to the nearest hundredth of a 1% (0-100%)
RADAR VARIABLES
Precip Type
| PrecipType Value | Precipitation Type |
| 0 | No Precip |
| 1 | Rain |
| 2 | Freezing Rain |
| 3 | Freezing Rain/Snow |
| 4 | Rain/Snow |
| 5 | Snow |
| 6 | Sleet |
Reflectivity
decibels rounded to the nearest thousandth of a digit
|
Level2 Reflectivity
decibels rounded to the nearest thousandth of a digit
|
UV Index
This is a derived value that takes clouds and local conditions into account when forecasting how much UV radiation will reach the earth’s surface. It is a unitless value that expresses the level of exposure to harmful UV radiation.
0-2 |
Good |
3-5 |
Moderate |
6-7 |
High |
8-10 |
Very High |
11+ |
Extreme |
Hailvision
millimeters rounded to the nearest hundredth of a millimeter
Rainvision
millimeters rounded to the nearest hundredth of a millimeter
Snowvision
millimeters rounded to the nearest hundredth of a millimeter
Icevision
millimeters rounded to the nearest hundredth of a millimeter
CLIMATOLOGY VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Precipitation Statistics
inches rounded to the nearest hundredth of an inch
Wind Statistics
miles per hour rounded to the nearest mph
Heating/Cooling Degree Day Statistics
Fahrenheit rounded to the nearest degree
AQI VARIABLES
Ozone Index
This is a unitless index that expresses the amount of ground-level ozone, which can be harmful to the lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
PM2.5 Index
This is a unitless index that expresses the amount of particle pollution at the surface, which can be harmful to the heart and lungs.
| 0-50 | Good |
51-100 |
Moderate |
101-150 |
Unhealthy for Sensitive Groups |
151-200 |
Unhealthy |
201-300 |
Very Unhealthy |
301+ |
Hazardous |
AIRPORT VARIABLES
Delay Times
Minutes rounded to nearest minute.
ALMANAC VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Precipitation Statistics
inches rounded to the nearest hundredth of an inch
Wind Statistics
miles per hour rounded to the nearest mph
Heating/Cooling Degree Day Statistics
Fahrenheit rounded to the nearest degree
Relative Humidity Statistics
percentage rounded to the nearest percent
Possible Sunshine Statistics
percentage rounded to the nearest percent
BUOY VARIABLES
Temperature Statistics
Fahrenheit rounded to the nearest degree
Wind Statistics
miles per hour rounded to the nearest mph
Wave Height
feet rounded to the nearest tenth of a foot
Pressure Statistics
inches of Mercury to the nearest 1/100th of an inch
TIDE VARIABLES
Tide Height
feet rounded to the nearest tenth of a foot