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Selyaninov hydrothermal coefficient
Source: unofficial: test dataUpdated: 18.10.2026 · form of 01.09.2026
I.28
Impacts
Unofficial data only
Selyaninov hydrothermal coefficient
Name in the form: Hydrothermal coefficient / Selyaninov coefficient
Period
- Form 1-IK
- Unofficial
Data
Values by year
| Year | Valueindex | Source and note |
|---|---|---|
| 2021 | 0.62 | Test |
| 2022 | 0.88 | Test |
| 2023 | 0.79 | Test |
| 2024 | 1.08 | Test |
| 2025 | 0.84 | Test |
Source data
Value in Form No. 1-IK
Not filled in.
Quality
Data remarks
No remarks.
Methodology
Indicator metadata
- Definition
- A classic agroclimatic indicator reflecting the ratio between the amount of atmospheric precipitation and potential evaporation over the period with air temperatures above ten degrees Celsius. It is used for the comprehensive assessment of moisture availability for agricultural crops, the zoning of territories and the monitoring of drought intensity in the changing climate of Tajikistan.
- Calculation method
- The calculation follows the standard Selyaninov formula in accordance with the methodological guidelines for agrometeorological monitoring. It is calculated for the warm period of the year with stable mean daily air temperatures above ten degrees Celsius. Mathematically, the indicator is computed as follows: the total precipitation in millimetres for the period analysed is multiplied by ten, after which the resulting value is divided by the sum of mean daily air temperatures in degrees Celsius for the same time interval. Coefficient values from one to one and a half correspond to sufficient moisture availability, values below one to aridity, and a drop of the index below zero point five indicates severe aridity (severe drought). The indicator is calculated monthly during the growing season (from April to October), as well as cumulatively at the end of the agricultural season and the calendar year.
- Institution responsible for calculation
- Agency for Hydrometeorology of the Committee for Environmental Protection under the Government of the Republic of Tajikistan; Committee for Environmental Protection under the Government of the Republic of Tajikistan