Southern Nevada Evapotranspiration Rates
And Crop (Landscape) Coefficients
The following table contains average Las Vegas measured evapotranspiration (ETo) rates and crop coefficients (Kc) which were developed by the Cooperative Extension, University of Nevada, Reno. The crop (landscape) coefficients (Kc) are based on actual research. We chose not to include a leaching fraction in these tables because maximum efficiency will be achieved by periodically monitoring the soil moisture and salinity conditions of each site.
 |
Evapotranspiration
|
Crop Coefficients
|
Average
|
Average
|
Bermuda
|
Tall
|
| January |
0.098
|
3.04
|
.44
|
0.95
|
| February |
0.163
|
3.81
|
.43
|
0.95
|
| March |
0.187
|
5.80
|
.67
|
0.95
|
| April |
0.283
|
8.49
|
.76
|
0.95
|
| May |
0.355
|
11.01
|
.74
|
0.95
|
| June |
0.407
|
12.21
|
.89
|
1.10
|
| July |
0.399
|
12.37
|
.89
|
1.10
|
| August |
0.357
|
11.04
|
.82
|
1.10
|
| September |
0.281
|
8.43
|
.82
|
0.95
|
| October |
0.216
|
6.70
|
.77
|
0.95
|
| November |
0.146
|
4.38
|
.81
|
0.95
|
| December |
0.103
|
3.07
|
.51
|
0.95
|
* Common Bermuda Grass overseeded with Annual Rye grass.
The following data is from a weather station located at Freedom Park, Las Vegas, NV and is administered by the City of Las Vegas. The data is from a Rain Bird Maxicom weather station.
| Year |
1993
|
1994
|
1995
|
1996
|
1997
|
1998
|
1999
|
2000
|
2001
|
2002
|
2003
|
Avg.
|
| January |
1.08
|
3.03
|
1.39
|
3.25
|
2.33
|
2.52
|
3.86
|
2.87
|
2.49
|
3.15
|
2.33
|
2.57
|
| February |
1.62
|
3.02
|
3.40
|
3.68
|
3.81
|
2.85
|
3.88
|
3.64
|
3.63
|
4.34
|
2.79
|
3.33
|
| March |
4.61
|
6.35
|
4.92
|
6.70
|
6.05
|
5.86
|
7.21
|
6.28
|
6.14
|
6.93
|
4.24
|
5.94
|
| April |
8.63
|
8.08
|
7.28
|
8.97
|
7.13
|
7.98
|
7.68
|
9.85
|
8.88
|
9.87
|
5.66
|
8.18
|
| May |
10.39
|
10.21
|
8.46
|
10.83
|
10.66
|
11.18
|
11.53
|
13.01
|
12.26
|
12.16
|
9.51
|
10.93
|
| June |
11.93
|
12.85
|
11.04
|
10.61
|
11.82
|
12.31
|
13.08
|
13.30
|
13.86
|
13.68
|
11.03
|
12.32
|
| July |
13.55
|
12.23
|
11.51
|
11.54
|
11.44
|
12.85
|
11.65
|
14.28
|
13.65
|
12.81
|
8.92
|
12.22
|
| August |
11.15
|
11.03
|
10.97
|
11.73
|
10.21
|
11.88
|
11.01
|
10.96
|
12.33
|
12.74
|
7.93
|
11.09
|
| September |
8.56
|
8.31
|
8.22
|
8.31
|
6.95
|
7.67
|
9.11
|
9.51
|
9.68
|
8.82
|
7.12
|
8.39
|
| October |
5.39
|
5.20
|
5.54
|
5.74
|
5.29
|
6.11
|
6.79
|
5.74
|
6.22
|
4.63
|
7.95
|
5.87
|
| November |
3.05
|
3.25
|
3.19
|
3.00
|
2.88
|
3.20
|
3.60
|
3.30
|
3.74
|
3.35
|
2.17
|
3.16
|
| December |
2.17
|
1.99
|
2.42
|
1.80
|
2.55
|
2.92
|
2.83
|
2.47
|
2.36
|
1.88
|
1.89
|
2.30
|
| Total |
82.13
|
85.55
|
78.34
|
86.16
|
81.12
|
87.33
|
92.23
|
95.21
|
95.24
|
94.36
|
71.54
|
86.29
|
The evapotranspiration rates (ETo) are provided by Mojave Water Management as a service to the Green Industry. To find out more information on how to use evapotranspiration rates and crop (landscape) coefficients see the following web sites: