error CS0165: Use of a unassigned variable 'temp'

I am wondering if anyone could help me with this error my C# code is:

using UnityEngine;
using System.Collections;

public class GameTime : MonoBehaviour {
public enum TimeOfDay {
Idle,
SunRise,
SunSet

}
public Transform[] sun;
public float dayCycleInMinutes = 1;

private const float SECOND = 1;
private const float MINUTE = 60 * SECOND;
private const float HOUR = 60 * MINUTE;
private const float DAY = 60 * MINUTE;

public float sunRise;
public float sunSet;
public float skyboxBlendModifier;

private float _dayCycleInSeconds;

private const float DEGREES_PER_SECOND = 360 / DAY;

private float _degreeRotation;

private float _timeOfDay;

private TimeOfDay _tod;



//Usethisfor initialization
void Start () {
_tod = TimeOfDay.Idle;


_dayCycleInSeconds = dayCycleInMinutes * MINUTE;



RenderSettings.skybox.SetFloat("_Blend",0);

_timeOfDay = 0;
_degreeRotation = DEGREES_PER_SECOND * DAY / (_dayCycleInSeconds);

sunRise *= _dayCycleInSeconds;
sunSet *= _dayCycleInSeconds;

}

//Updateiscalledonceper frame
void Update () {
for(int cnt = 0; cnt < sun.Length; cnt++)
sun[cnt].Rotate(new Vector3(_degreeRotation, 0, 0) * Time.deltaTime);

BlendSkybox ();

if (_timeOfDay > _dayCycleInSeconds)
_timeOfDay -= _dayCycleInSeconds;


_timeOfDay += Time.deltaTime;
//Debug.Log(_timeOfDay);

if (_timeOfDay > sunRise) {
_tod = GameTime.TimeOfDay.SunRise;
BlendSkybox ();

}
}
private void BlendSkybox() {
float temp;

switch(_tod) {
case TimeOfDay.SunRise:
temp = (_timeOfDay - sunRise)/ _dayCycleInSeconds * skyboxBlendModifier;
break;
case TimeOfDay.SunSet:
temp = (_timeOfDay - sunSet) / _dayCycleInSeconds * skyboxBlendModifier;
temp = 1 - temp;
break;

}

RenderSettings.skybox.SetFloat("_Blend", temp);

Debug.Log(temp);

}

}

Thanks.

 

If _tod gits the "default" case, temp will still be Null! Therefore the compilersays uh oh, a parameter RenderSettings.skybox.SetFloat("_Blend", temp) is not set!

Try float temp = 0;

 

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