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Data Klimatologi
Jan Feb Mar April Mei Juni Juli Agt Sept Okt Nov Des
1 Suhu Bulanan Rata-rata oC 25.67 25.93 26.47 26.84 27.25 27.23 26.93 26.72 26.43 26.12 25.85 25.62
2 Kelembaban Relatif Rata-rata % 83.59 82.56 81.91 81.82 81.14 79.49 80.12 80.52 82.26 83.89 85.78 85.42
3 Kecepatan Angin Rata-rata m/det 3.28 3.00 3.11 3.00 2.90 2.95 2.75 2.95 3.25 3.55 3.40 3.06
4 Kecerahan Matahari Rata-rata % 43.09 46.75 47.50 45.07 47.06 44.96 42.70 38.96 37.85 35.79 31.68 29.23
Sumber : Stasiun Meteorologi Lhokseumawe
Jan Feb Mar April Mei Juni Juli Agt Sept Okt Nov Des
1 Jumlah hari 31.000 28.000 31.000 30.000 31.000 30.000 31.000 31.000 30.000 31.000 30.000 31.000
2 Suhu Bulanan Rata-rata (Trerata) oC 25.668 25.929 26.469 26.843 27.254 27.231 26.928 26.722 26.430 26.119 25.852 25.615
No Data KlimatologiBulan
Perhitungan Evapotranspirasi Potensial Metode Penmann Modifikasi Standar FAO Menurut Smith
No UraianBulan
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Jan Feb Mar April Mei Juni Juli Agt Sept Okt Nov Des
Evap
otra
nspi
rasi
(mm
/har
i)
Bulan
Evapotranspirasi
2 Suhu Bulanan Rata-rata (Trerata) oC 25.668 25.929 26.469 26.843 27.254 27.231 26.928 26.722 26.430 26.119 25.852 25.615
3 Kelembaban Relatif Rata-rata (RHrerata) % 83.586 82.556 81.906 81.819 81.136 79.488 80.116 80.524 82.260 83.888 85.778 85.424
4 Kecepatan Angin Rata-rata (Urerata) m/det 3.278 3.000 3.111 3.000 2.900 2.950 2.750 2.950 3.250 3.550 3.400 3.056
5 Kecerahan Matahari Rata-rata (n/N) % 43.086 46.748 47.499 45.068 47.061 44.957 42.696 38.962 37.851 35.789 31.681 29.228
6 Takanan uap jenuh (es) kPa 3.297 3.348 3.457 3.534 3.620 3.615 3.551 3.509 3.449 3.386 3.333 3.287
7 Tekanan uap aktual (ea) kPa 2.756 2.764 2.831 2.891 2.937 2.874 2.845 2.825 2.837 2.841 2.859 2.808
8 Kemiringan kurva tekanan uap terhadap temperatur (d)kPa/oC 0.195 0.198 0.203 0.207 0.211 0.211 0.208 0.206 0.203 0.200 0.197 0.194
9 Panas laten untuk penguapan (L) MJ/kg 2.440 2.440 2.439 2.438 2.437 2.437 2.437 2.438 2.439 2.439 2.440 2.441
10 Radiasi ekstra teresterial (Ra) mm/hari15.950 16.050 15.550 14.550 13.250 12.600 12.900 13.850 14.950 15.750 15.900 15.850
11 Radiasi global (Rs) MJ/m2/hari18.195 19.030 18.580 16.951 15.761 14.663 14.654 15.100 16.095 16.558 15.916 15.389
12 Konstanta Stefan-Boltzman (b) MJ/m2/K-4/hari0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
13 Temperatur udara (Tk) oK 298.818 299.079 299.619 299.993 300.404 300.381 300.078 299.872 299.580 299.269 299.002 298.765
14 Intensitas radiasi gelombang panjang (Rb) MJ/m2/hari2.050 2.189 2.175 2.046 2.091 2.067 1.998 1.869 1.812 1.726 1.558 1.494
15 Albedo (a) 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250
16 Radiasi bersih (Rn) MJ/m2/hari11.596 12.083 11.760 10.668 9.730 8.930 8.993 9.456 10.259 10.693 10.379 10.048
17 Konstanta psikometrik (t) kPa/oC 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.065 0.065
18 Kv 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900 0.900
19 Evapotranspirasi potensial (ETo) mm/hari 3.451 3.618 3.634 3.412 3.252 3.164 3.091 3.192 3.291 3.291 3.081 2.995
20 Evapotranspirasi potensial (ETo) mm 106.987 101.315 112.665 102.355 100.806 94.920 95.815 98.967 98.743 102.010 92.423 92.835
Sumber : Hasil Perhitungan 2015
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Jan Feb Mar April Mei Juni Juli Agt Sept Okt Nov Des
Evap
otra
nspi
rasi
(mm
/har
i)
Bulan
Evapotranspirasi
Keterangan:
[1] Jumlah hari [9] 2,501 - (2,361 x 10-3)T [17] 0,06466
[2] Data St. BMKG Lhokseumawe [10] Tabel [18] 0,90 (Rob. Van der Weet. 1994)
[3] Data St. BMKG Lhokseumawe [11] Ra (0,25 + 0,50 n/N) [19] Kv x {((d.Rn/L) + t [(900/Tk)U(es-ea)]) / (d + t(1+0,34U))}
[4] Data St. BMKG Lhokseumawe [12] 4,90 x 10-9 MJ/m2/K-4/hari [20] [19] x Jumlah hari
[5] Data St. BMKG Lhokseumawe [13] 273,15 + T
[6] 0,611 exp [17,27 T/(T + 237.3)] [14] b x Tk4 x (0,34 - 0,14 . ea0.5) x (0,10 + 0,90 n/N)
[7] es x RH [15] 0.25
[8] 4089 x es / (T + 237.3)2 [16] Rs(1 - a) - Rb
4
4.5
Evap
otra
nspi
rasi
(mm
/har
i)
Evapotranspirasi
