Republic of the Philippines

Department of Science and Technology

Philippine Atmospheric, Geophysical and Astronomical Services Administration
Climatology and Agrometeorology Division
CLIMATE AND AGROMET DATA SECTION
PAGASA Science Garden Complex, Agham Road, Diliman Quezon City, Philippines
Telephone: 8284-0800 loc. 113

CLIMATOLOGICAL NORMALS

STATION: BUTUAN CITY, AGUSAN DEL NORTE LATITUDE: 08o56'49.17''N

PERIOD: 1991 - 2020 LONGITUDE: 125o28'56.76E
ELEVATION: 17.6m

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16a) (16b)
RAINFALL TEMPERATURE WIND NO. OF DAYS W/
VAPOR CLOUD
NO. DRY WET DEW RH MSLP
MONTH AMOUNT MAX MIN MEAN PRESS. DIR SPD AMT.
OF BULB BULB POINT (%) (mbs) TSTM LTNG
(mm) (°C) (°C) (°C) (mbs) (16pt) (mps) (okta)
RD (°C) (°C) (°C)
JAN 326.4 18 30.2 23.0 26.6 26.1 24.5 23.9 29.7 88 1011.6 NW 1 6 3 3
FEB 234.5 13 30.8 22.9 26.9 26.4 24.4 23.7 29.4 85 1012.0 NW 2 6 3 2
MAR 148.9 13 31.8 23.3 27.6 27.1 24.8 24.0 29.9 83 1011.7 ESE 2 6 5 3
APR 116.9 10 33.0 24.0 28.5 28.0 25.5 24.6 30.9 82 1010.9 NNW 2 5 7 6
MAY 111.4 11 33.7 24.7 29.2 28.7 26.1 25.2 32.1 82 1010.1 ESE 2 5 15 14
JUN 174.3 14 33.2 24.5 28.9 28.2 25.8 25.0 31.8 83 1009.9 N 2 6 16 15
JUL 152.4 13 32.7 24.3 28.5 28.0 25.6 24.8 31.3 83 1009.7 N 2 6 13 15
AUG 114.4 10 32.9 24.4 28.6 28.2 25.6 24.7 31.2 82 1009.7 N 2 6 12 15
SEP 126.5 10 32.9 24.2 28.6 28.1 25.6 24.7 31.2 82 1010.0 N 2 6 13 16
OCT 170.4 13 32.6 24.2 28.4 27.9 25.6 24.8 31.3 84 1010.0 N 2 6 15 16
NOV 197.8 15 31.7 23.8 27.8 27.2 25.3 24.6 31.0 86 1010.0 NW 1 6 10 10
DEC 251.8 17 31.1 23.6 27.4 26.8 25.1 24.4 30.7 87 1010.5 NNW 1 6 6 5
ANNUAL 2,125.7 157 32.2 23.9 28.1 27.6 25.3 24.5 30.9 84 1010.5 N 2 6 118 120

Definition of Terms:
Climatological Normals
- Period averages computed for a uniform and relative long period comprising at least three (3) consecutive10-year period.
Rainfall Amount (column 2)
- The amount of precipitation (rain, hail, etc.) expressed in millimeters depth of the layer of the water which has fallen.
Number of Rainy Days (column 3)
- A rainy day is defined as a period of 24 hours beginning at 8AM to 8 AM of the next day during which at least 1 mm of rain is recorded.
Maximum Temperature (column 4)
- The maximum temperature in °C recorded for the day, usually occurring in the early afternoon.
Minimum Temperature (column 5)
- The minimum temperature in °C recorded for the day, usually occurring during early hours of the morning (before sunrise).
Mean Temperature (column 6)
- The average of the maximum and minimum temperature in °C recorded for the day. Mean Temperature = Maximum + Minimum / 2
Dry Bulb Temperature (column 7)
- It gives the air temperature in °C at the time of observation.
Wet Bulb Temperature (column 8)
- It gives the temperature in °C that an air parcel would have if cooled adiabatically to saturation at constant pressure by evaporating water in it.
Dew Point Temperature (column 9)
- The temperature in °C at a given pressure, to which the air must be cooled to become saturated. It is the temperature when atmospheric moisture begins to condense
to liquid forming “dew” upon objects.
Vapor Pressure (column10)
- Denotes the partial pressure of water vapor in atmosphere in millibars (mbs). As the water evaporates, additional water vapor is introduced into space above and
pressure increases slightly as the new vapor is added. The increasing pressure is due to an increase in the partial pressure of water vapor.
Relative Humidity (column 11)
- The ratio of the amount of water vapor actually in the air to the maximum amount the air can hold at that temperature.
Mean Sea Level Pressure (column 12)
- The force exerted by the weight of the atmosphere on a unit area at mean sea level. It is also the atmospheric pressure at mean sea level measured in millibars.
Prevailing Winds (column 13 & 14)
- The prevailing wind direction expressed using the 16 compass points which is most frequently observed during a given period while the average wind speed in meters
per second is the arithmetic average of the observed wind speed.
Cloud Amount (column 15)
- The amount of cloud present in the sky, expressed in oktas of the sky cover. Okta is the function used in denoting cloud amount and is equal to 1/8 of the whole sky.
Days with Thunderstorm (column 16a)
- A thunderstorm day is defined as an observational day during which thunder is recorded at the station.
Days with Lightning (column 16b)
- A day with lightning is reported whenever lightning is observed.

(SGD.) (SGD.)
MA. ELENA V. TAN THELMA A. CINCO
OIC, CADS Chief, CAD

PREPARED BY: CADS/CAD/PAGASA