# ERA5

ERA5 is the fifth generation of ECMWF atmospheric reanalysis of the global climate, produced by the Copernicus Climate Change Service (C3S). It provides hourly estimates of atmospheric, land, and oceanic climate variables from 1990 to present.

## Data Access

* Global coverage at 0.25° resolution (720x1440 grid)
* Hourly temporal resolution
* Real-time data access via [REST API](https://docs.jua.ai/api-v2/getting-started)

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ERA5 data is available with approximately 5-7 days delay from the present.
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## Technical Specifications

### Available Weather Parameters

ERA5 uses standardized variable naming conventions. For full details on the naming structure, see [Weather Variable Naming](https://docs.jua.ai/python-sdk/weather/naming).

| Code    | API Name                                                    | Description                           | Units        |
| ------- | ----------------------------------------------------------- | ------------------------------------- | ------------ |
| 2t      | air\_temperature\_at\_height\_level\_2m                     | Air temperature at 2m                 | Kelvin       |
| 2d      | dew\_point\_temperature\_at\_height\_level\_2m              | Dew point temperature at 2m           | Kelvin       |
| sp      | surface\_air\_pressure                                      | Surface Pressure                      | Pa           |
| msl     | air\_pressure\_at\_mean\_sea\_level                         | Mean Sea-level Pressure               | Pa           |
| skt     | surface\_temperature                                        | Surface Temperature                   | Kelvin       |
| 10si    | wind\_speed\_at\_height\_level\_10m                         | Horizontal wind speed at 10m          | m s⁻¹        |
| 10wdir  | wind\_direction\_at\_height\_level\_10m                     | Horizontal wind direction at 10m      | Degrees true |
| 100si   | wind\_speed\_at\_height\_level\_100m                        | Horizontal wind speed at 100m         | m s⁻¹        |
| 100wdir | wind\_direction\_at\_height\_level\_100m                    | Horizontal wind direction at 100m     | Degrees true |
| 10fg    | wind\_speed\_of\_gust\_at\_height\_level\_10m\_max          | Maximum wind gust at 10m              | m s⁻¹        |
| tcc     | cloud\_area\_fraction\_at\_entire\_atmosphere               | Total Cloud Cover                     | %            |
| lcc     | cloud\_area\_fraction\_at\_entire\_atmosphere\_low\_type    | Low Cloud Cover                       | %            |
| mcc     | cloud\_area\_fraction\_at\_entire\_atmosphere\_medium\_type | Medium Cloud Cover                    | %            |
| hcc     | cloud\_area\_fraction\_at\_entire\_atmosphere\_high\_type   | High Cloud Cover                      | %            |
| ssrd    | surface\_downwelling\_shortwave\_flux\_sum\_1h              | Surface solar downward irradiance     | J m⁻²        |
| fdir    | surface\_direct\_downwelling\_shortwave\_flux\_sum\_1h      | Direct solar radiation at the surface | J m⁻²        |
| ssr     | surface\_net\_downward\_shortwave\_flux\_sum\_1h            | Net surface solar radiation           | J m⁻²        |
| tp      | precipitation\_amount\_sum\_1h                              | Total Precipitation                   | mm m⁻²       |
| ptype   | predominant\_precipitation\_type\_at\_surface               | Precipitation Type                    | categorical  |
| cape    | atmosphere\_convective\_available\_potential\_energy        | CAPE                                  | J kg⁻¹       |
| sst     | sea\_surface\_temperature                                   | Sea Surface Temperature               | Kelvin       |

## Data Availability

| **Dataset** | **Spatial Extent**                       | **Temporal Extent** |
| ----------- | ---------------------------------------- | ------------------- |
| ERA5        | Global, 0.25° resolution (720x1440 grid) | 1990-01-01 - today  |