AGROCLIMATIC INFORMATION FOR AGRICULTURAL PLANNING AND OPERATION IN ILOCOS NORTE PARTICULARLY BATAC AND SURROUNDING AREAS FOR THE MONTH OF MAY

I. AGROCLIMATIC SUMMARY::

Partly cloudy to cloudy skies is normal in the area. Total rainfall amount averages 184.7 mm with 9 rainy days. This month usually marks the onset of rainy season. Total evaporation of 183.4 mm are the normal values for the month.

Soil moisture is from dry to moist. Normal relative humidity of 78%. Poor drying condition starts during the later part of May. Leaf wetness duration is from 6 to 12 hours. Daylight duration is 12 hours and 59 minutes with 55% total bright sunshine. This situation gives an amount of 21.4 MJ/m2 of solar radiation during most days of the month. Light southeasterly to easterly winds prevail.

The normal maximum air temperature is 33.6 °C. An extreme temperature of 42.8 °C. was recorded on May 10, 2003. Minimum air temperature is 23.9 with an extreme coolness of 18.5°C. as what was recorded on May 28, 1977.

II. AGROCLIMATIC DATA (AVERAGE)::

Decade Rainfall Rainy P(TC)* Tot AIR TEMPERATURE RH Solar Wind
(10 Day) (mm) days % evap. Max. Min. (%) Rad. Speed
        (mm) (°C) (°C)   MJ/m2 (kpd)
May                  
1-10 11.2 1 7 64.4 34.4 23.6 76 23.4 46.8
11-20 55.0 3 30 58.2 34.1 23.9 77 21.4 45.0
21-31 118.5 5 27 60.8 33.1 23.9 81 19.4 47.2

* Probability of having a Tropical Cyclone

III. TROPICAL CYCLONE

Northern Luzon which includes Ilocos Norte is within the normal tropical cyclone track. The following are the disturbances over the area (1981-2020).

TC Name Year and Date Occurrence Rainfall Amount (mm)
TS Klaring May 27-29 1986 70.2
TS Auring May 31-June 8, 1995 9.8
T Konsing May 11-17, 1996 11.6
TS Ditang May 20-22, 1996 86.0
TD Bining May 26-27, 1997 29.7
TD Biring May 18-19, 2000 22.0
TD Konsing May 21-22, 2000 26.2
TS Crising May 10-13, 2001 88.4
TC Chedeng May 25-28, 2003 145.4
TS Dodong May 31-June 3, 2003 137.2
TY Dindo May 17-20, 2004 23.8
TS Enteng May 21, 2004 18.1
TY Caloy May 17-18, 2006 50.2
TS Cosme May 16-18, 2008 62.8
TS Emong May 5-7, 2009 57.4
TS Bebeng May 9-10, 2011 33.6
TY Chedeng May 26-27, 2011 29.3
TY Dodong May 9-11, 2015 29.0
TS Ambo May 14-17, 2020 18.9

TD - Tropical Depression ( >62 kph)

TS - Tropical Storm (62-88 kph)

STS – Severe Tropical Storm (89-117 kph)

TY - Typhoon (118-220 kph)

STY - Super Typhoon (< 222 kph)