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


DBZ

Precipitation Intensity

0-10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

Level2 Reflectivity
decibels rounded to the nearest digit


DBZ

Precipitation Intensity

Less than 10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

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

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


DBZ

Precipitation Intensity

0-10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

Level2 Reflectivity
decibels rounded to the nearest digit


DBZ

Precipitation Intensity

Less than 10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

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


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

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%)

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


DBZ

Precipitation Intensity

0-10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

Level2 Reflectivity
decibels rounded to the nearest digit


DBZ

Precipitation Intensity

Less than 10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

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


DBZ

Precipitation Intensity

0-10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

Level2 Reflectivity
decibels rounded to the nearest thousandth of a digit


DBZ

Precipitation Intensity

Less than 10

No Precipitation or Drizzle

10-25

Light Precipitation

25-40

Moderate Precipitation

40+

Heavy Precipitation

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