Definitions of climate indices
Definitions of temperature indices set A
| Index | Abbreviation | Definition | Temporal resolution | Unit |
|---|---|---|---|---|
| Summer days | sd | Number of days with maximum temperature > 25°C | Annual (Jan-Dec) | Days |
| Hot days | hd | Number of days with maximum temperature > 30°C | Annual (Jan-Dec) | Days |
| Tropical nights #1 | tn1 | Number of days with minimum temperature > 20°C | Annual (Jan-Dec) | Days |
| Tropical nights #2 | tn2 | Number of days with minimum temperature > 22°C | Annual (Jan-Dec) | Days |
| Frost days | fd | Number of days with minimum temperature ≤ 0°C | Annual (Jul-Jun) | Days |
| Consecutive frost days | cfd | Maximum number of consecutive days with minimum temperature ≤ 0°C | Annual (Jul-Jun) | Days |
| Ice days | id | Number of days with maximum temperature ≤ 0°C | Annual (Jul-Jun) | Days |
| Freeze-thaw days | ft1 | Number of days with minimum temperature ≤ 0°C and maximum temperature > 0°C | Annual (Jul-Jun) | Days |
| Freeze-thaw days - spring | ft2 | Number of days with minimum temperature ≤ 0°C & maximum temperature > 0°C | Jan-Apr | Days |
| Growing degree-days | gdd5 | Sum of degrees with mean temperature > 5°C | Annual (Jan-Dec) | °C |
| Cooling degree-days | cdd | Sum of degrees with mean temperature < 18°C | Annual (Jan-Dec) | °C |
| Heating degree-days | hdd | Sum of degrees with mean temperature > 18°C | Annual (Jan-Dec) | °C |
| Frost-free season | FFS | Maximum number of consecutive days with minimum temperature > 0°C | Annual (Jan-Dec) | Days |
| Frost-free season starting date | FFSs | Starting date of frost-free season | n/a | Date |
| Frost-free season ending date | FFSe | Ending date of frost-free season | n/a | Date |
| Growing season | GS | start when mean temperature > 5°C for 6 days and end when mean temperature < 5°C for 6 days | Annual (Mar-Nov) | Days |
| Growing season starting date | GSs | Starting date of growing season | n/a | Date |
| Growing season ending date | GSe | Ending date of growing season | n/a | Date |
Definitions of temperature indices set B
| Abbreviation | Definition | Time Period | Unit |
|---|---|---|---|
| WinTx05 | Winter 5th percentile of maximum temperature | Dec-Jan-Feb | °C |
| WinTx95 | Winter 95th percentile of maximum temperature | Dec-Jan-Feb | °C |
| WinTn05 | Winter 5th percentile of minimum temperaure | Dec-Jan-Feb | °C |
| WinTn95 | Winter 95th percentile of minimum temperature | Dec-Jan-Feb | °C |
| SprTx05 | Spring 5th percentile of maximum temperature | Mar-Apr-May | °C |
| SprTx95 | Spring 95th percentile of maximum temperature | Mar-Apr-May | °C |
| SprTn05 | Spring 5th percentile of minimum temperature | Mar-Apr-May | °C |
| SprTn95 | Spring 95th percentile of minimum temperature | Mar-Apr-May | °C |
| SumTx05 | Summer 5th percentile of maximum temperature | Jun-Jul-Aug | °C |
| SumTx95 | Summer 95th percentile of maximum temperature | Jun-Jul-Aug | °C |
| SumTn05 | Summer 5th percentile of minimum temperature | Jun-Jul-Aug | °C |
| SumTn95 | Summer 95th percentile of minimum temperature | Jun-Jul-Aug | °C |
| AutTx05 | Autumn 5th percentile of maximum temperature | Sep-Oct-Nov | °C |
| AutTx95 | Autumn 95th percentile of maximum temperature | Sep-Oct-Nov | °C |
| AutTn05 | Autumn 5th percentile of minimum temperature | Sep-Oct-Nov | °C |
| AutTn95 | Autumn 95th percentile of minimum temperature | Sep-Oct-Nov | °C |
Definitions of precipitation indices
| Index | Abbreviation | Definition | Resolution | Unit |
|---|---|---|---|---|
| Days with rainfall | nd_r | Number of days with rain ≥ 1 mm | Annual (Jan-Dec) | Days |
| Days with snowfall | nd_s | Number of days with snow ≥ 1 mm | Annual (Jul-Jun) | Days |
| Days with precipitation | nd_p | Number of days with precipitation ≥ 1 mm | Annual (Jan-Dec) | Days |
| Days with heavy rainfall | h1_r | Number of days with rain > 90th percentile | Annual (Jan-Dec) | days |
| Days with heavy snowfall | h1_s | Number of days with snow > 90th percentile | Annual (Jul-Jun) | Days |
| Days with heavy precipitation | h1_p | Number of days with precipitation > 90th percentile | Annual (Jan-Dec) | Days |
| Highest 1-day rainfall | x1_r | Highest 1-day rain | Annual (Jan-Dec) | mm |
| Highest 1-day rainfall | x1_s | Highest 1-day snow | Annual (Jul-Jun) | mm |
| Highest 1-day precipitation | x1_p | Highest 1-day precipitation | Annual (Jan-Dec) | mm |
| Maximum number of consecutive dry days | mcdd | Max number of days with precipitation < 1 mm | Annual (Jan-Dec) | Days |