Climate related functions. More...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "headers.h"

Include dependency graph for climate.c:

Classes
struct	TMovAve
	Structure for moving average of daily temperatures. More...

Macros
#define	_CRT_SECURE_NO_DEPRECATE
	Define to prevent deprecation warnings from MS Visual C++ compilers.

Enumerations
enum	ClimateFileFormats { UNKNOWN_FORMAT , USER_PREPARED , GHCND , TD3200 , DLY0204 }

enum	ClimateVarType { TMIN , TMAX , EVAP , WIND }

enum	WindSpeedType { WDMV , AWND }

enum	TempUnitsType { DEG_C10 , DEG_C , DEG_F }

Functions
int	climate_readParams (char *tok[], int ntoks)
	Reads climate/temperature parameters from input line of data.

int	climate_readEvapParams (char *tok[], int ntoks)
	Reads evaporation parameters from input line of data.

int	climate_readAdjustments (char *tok[], int ntoks)
	Reads adjustments to monthly evaporation or rainfall from input line of data.

void	climate_validate ()
	Validates climatological variables.

void	climate_openFile ()
	Opens a climate file and reads in first set of values.

void	climate_initState ()
	Initializes climate state variables.

void	climate_setState (DateTime theDate)
	Sets climate variables for current date.

DateTime	climate_getNextEvapDate ()
	Gets the next date when evaporation rate changes.

Detailed Description

Climate related functions.

Climate related functions.

Update History

Build 5.1.007:
- NCDC GHCN climate file format added.
- Monthly adjustments for temperature, evaporation & rainfall added.
Build 5.1.008:
- Monthly adjustments for hyd. conductivity added.
- Time series evaporation rates can now vary within a day.
- Evaporation rates are now properly updated when only flow routing is being simulated.
Build 5.1.010:
- Hargreaves evaporation now computed using 7-day average temperatures.
Build 5.1.011:
- Monthly adjustment for hyd. conductivity <= 0 is ignored.
Build 5.1.013:
- Reads names of monthly adjustment patterns for various parameters of a subcatchment from the [ADJUSTMENTS] section of input file.
Build 5.2.0:
- Reads temperature units for use with GHCND climate files.
- Support added for relative file names.

Author: Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com (OpenSWMM maintenance and extensions)

Copyright: Copyright (c) 2026 Caleb Buahin. OpenSWMM contributions only; original EPA SWMM credits are retained.

License: Apache-2.0 for OpenSWMM contributions; original EPA SWMM provenance is retained.

#define _CRT_SECURE_NO_DEPRECATE

Define to prevent deprecation warnings from MS Visual C++ compilers.