Chapter 3
Climatic data bank

The climatic data² bank compiled for the assessment consists of three data sets. Data set 1(Historical Data, from Jaetzhold and Kutsch 1980) consists of the following information for 437 stations:

² The primary source of the climatic data is the Kenya Meteorological Department.

- Average decadal (10 day total) potential evapotranspiration (mm)

- Historical decadal rainfall (mm) for individual years.

Data set 2 (Average climatic data, from FAO/AGPC data bank) consists of 45 stations with mean monthly values for the following 11 climatic parameters:

- Precipitation (mm)

- Mean daily temperature (°C)

- Maximum temperature (°C)

- Minimum temperature (°C)

- Day-time temperature (°C)

- Night-time temperature (°C)

- Mean water vapour pressure (mbar)

- Mean wind velocity (m sec-¹)

- Hours of bright sunshine as a percentage of maximum possible sunshine hours (%) - Solar radiation (cal cm^-2 day^-1)

- Potential evapotranspiration (mm).

Data set 3 (Average climatic data, from Kenya Soil Survey) provides average data on the following for 1489 stations:

- Annual daily temperature (°C)

- Annual potential evaporation (mm)

- Annual potential evapotranspiration (mm)

- Annual Rainfall (mm)

- Monthly rainfall (mm)

- Type of rainfall pattern; monomodal (M), bimodal (B) or trimodal (T).

Extracts of the three data Sets are presented in Tables 2.1, 2.2 and 2.3 respectively. The complete climatic data bank is available on diskettes (ASCII).

TABLE 3.1
Extract agroclimatic data bank - Data set 1 - Historical data

STATION: EMBU	NUMBER: 9037008			LAT: 0.32° S			LONG: 32.27° E			ALT: 1410 FT			40 YEARS' RECORDS
		Jan	Feb		Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
AVERAGE PET	DECAD 1	40.8	43.2		44.8	40.0	37.6	34.4	32.8	32.8	37.6	40.8	36.8	36.8
	DECAD 2	42.4	43.2		45.6	37.6	37.6	33.6	32.0	32.8	39.2	41.6	35.2	36.8
	DECAD 3	42.4	44.0		44.0	37.6	36.8	33.6	32.0	34.4	40.0	40.0	36.0	38.4
	MONTH	125.4	130.4		134.4	115.2	112.0	101.6	96.8	100.0	116.8	122.4	108.0	112.0	1375.0
RAINFALL (1927)	DECAD 1	1.8	0.0		29.0	20.0	47.3	0.3	8.1	2.9	6.6	0.0	19.3	14.5
	DECAD 2	0.0	2.0		167.8	64.5	19.1	52.2	2.1	7.0	0.0	58.3	68.1	16.8
	DECAD 3	0.0	1.5		52.3	75.3	3.1	0.3	0.8	2.8	4.1	82.8	8.9	0.0
	MONTH	1.8	3.5		249.1	159.8	69.5	52.8	11.0	12.7	10.7	141.1	96.3	31.3	839.6
RAINFALL (1928)	DECAD 1	15.6	0.0		40.9	10.2	101.1	16.2	0.0	2.6	0.0	6.4	40.7	21.9
	DECAD 2	39.1	0.0		0.0	140.2	103.0	1.1	6.7	0.0	0.0	0.0	108.2	0.0
	DECAD 3	0.0	0.0		7.1	80.4	62.1	3.8	0.0	5.6	5.1	17.3	49.2	0.0
	MONTH	54.7	0.0		48.0	230.8	266.2	21.1	6.7	8.2	5.1	23.7	198.1	21.9	884.5
RAINFALL (1929)	DECAD 1	51.6	0.0		0.0	12.4	66.7	0.8	10.9	0.0	32.8	1.0	108.7	102.9
	DECAD 2	6.6	0.0		66.5	12.4	7.9	7.9	14.3	0.0	27.2	34.0	104.5	38.0
	DECAD 3	6.4	0.0		5.1	153.5	14.3	2.0	12.5	5.8	0.0	80.8	4.6	12.3
	MONTH	64.6	0.0		71.6	178.3	88.9	10.7	37.7	5.8	60.0	115.8	217.8	153.2	1004.4
RAINFALL (1930)	DECAD 1	0.0	28.7		76.5	57.8	66.9	12.5	0.0	10.7	2.6	26.7	122.8	42.9
	DECAD 2	0.0	0.0		20.6	109.7	28.3	0.0	7.6	6.1	5.6	28.4	94.7	28.0
	DECAD 3	43.0	0.0		80.7	107.3	5.4	6.6	0.8	33.0	2.5	66.1	53.9	1.0
	MONTH	43.0	28.7		177.8	274.8	100.6	19.1	8.4	49.8	10.7	121.2	271.4	71.9	1177.4

TABLE 3.2
Extract agroclimatic data bank - Data set 2 - Average climatic data

COUNTRY: KENYA STATION: LOKITAUNG		NUMBER: 63610			LAT: 4.15°		LONG: 35.45°E ELEVATION: 730 m
	Jan		Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
PRECIPITATION (mm)	12		17	53	119	47	22	32	13	7	13	32	28	395
TEMPERATURE (°C; AVERAGE)	28.0		28.5	28.2	26.0	26.6	26.6	25.7	25.7	26.8	26.8	27.1	26.8	26.9
TEMPERATURE (°C; MEAN MAX.)	33.2		33.8	33.2	31.0	31.0	31.0	30.5	30.5	31.6	31.6	32.1	31.6	31.8
TEMPERATURE (°C; MEAN MIN.)	22.7		23.2	23.2	21.0	22.1	22.1	21.0	21.0	22.1	22.1	22.1	22.1	22.1
TEMPERATURE (°C; MEAN DAY)	29.8		30.4	30.0	27.8	28.1	28.1	27.5	27.5	28.5	28.5	28.9	28.5	28.6
TEMPERATURE (°C; MEAN NIGHT)	26.1		26.6	26.4	24.2	24.9	24.9	24.0	24.0	25.1	25.1	25.2	25.1	25.1
VAPOUR PRESSURE	21.1		22.7	23.0	23.0	22.5	20.8	20.5	20.1	20.1	21.6	23.0	22.0	21.7
WIND SPEED (at 2m ELEV.)	3.7		4.3	4.0	2.9	3.3	3.7	3.8	3.7	4.1	4.1	4.3	4.0	3.8
SUNSHINE (%)	84		81	75	78	83	83	76	83	88	84	76	81	81
TOTAL RADIATION	530		548	545	552	550	535	515	557	587	563	510	510	541
EVAPOTRANSPIRATION	188		184	198	157	171	171	169	178	194	191	174	173	2148

COUNTRY: KENYA STATION: LODWAR		NUMBER: 63612			LAT: 3.07°		LONG: 35.37°E ELEVATION: 515 m
	Jan		Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
PRECIPITATION (mm)	15		8	27	56	27	6	23	10	2	9	21	16	220
TEMPERATURE (°C; AVERAGE)	28.8		29.8	30.2	29.6	29.7	29.0	28.2	28.5	29.3	29.8	29.0	28.6	29.2
TEMPERATURE (°C; MEAN MAX.)	35.5		36.5	36.0	35.0	34.8	34.1	33.0	33.3	34.8	35.2	34.6	34.5	34.8
TEMPERATURE (°C; MEAN MIN.)	22.2		23.1	24.3	24.3	24.6	24.0	23.5	23.5	23.8	24.5	23.5	22.6	23.7
TEMPERATURE (°C; MEAN DAY)	31.2		32.2	32.3	31.6	31.5	30.9	30.0	30.2	31.3	31.8	31.0	30.7	31.2
TEMPERATURE (°C; MEAN NIGHT)	26.5		27.4	28.1	27.7	27.8	27.2	26.5	26.6	27.3	27.9	27.0	26.3	27.2
VAPOUR PRESSURE	17.0		17.0	19.3	22.0	22.0	20.3	19.5	19.5	18.7	18.7	19.0	19.0	19.3
WIND SPEED (at 2m ELEV.)	2.6		2.8	3.0	2.8	2.8	2.6	2.4	2.8	3.0	3.2	2.8	2.4	2.8
SUNSHINE (%)	84		81	75	78	83	83	76	83	88	84	76	81	81
TOTAL RADIATION	537		553	546	550	545	529	509	553	587	567	516	517	542
EVAPOTRANSPIRATION	197		195	205	186	188	171	167	186	198	208	178	170	2249

TABLE 3.3
Extract agroclimatic data bank - data set 3 - Average data

Station code	Station name	°Lat (N/S)	°Long (E)	Alt (ft)	Average Annual Data				Average Monthly Rainfall Data												Yrs	RP type
Station code	Station name	°Lat (N/S)	°Long (E)	Alt (ft)	Temp	Eo	PET	P	Jan	Feb	Mar	Apr	Hay	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Yrs	RP type
9439000	Kilindini	4.03	39.39	64	26	2168	1734	1059	28	13	56	171	262	106	68	64	66	88	83	54	50	B
9439001	Kwale Agr. Dept.	4.11	39.28	1294	24	2075	1662	1089	34	19	60	159	227	98	81	64	67	99	102	79	60	B
9439002	Mombasa Old.	4.04	39.41	53	26	2169	1735	1193	26	16	62	199	313	113	86	67	68	87	99	57	81	B
9439003	Ramisi Ass. Sug.	4.31	39.25	50	26	2175	1740	1426	23	18	78	271	359	155	121	82	61	84	103	71	39	B
9439004	Gazi Kenya Sug.	4.25	39.30	150	26	2161	1729	1350	23	24	70	256	347	150	100	86	68	79	89	58	50	B
9439005	Waa	4.10	39.37	68	26	2175	1740	1289	28	10	71	240	340	118	28	77	122	90	96	69	10	B
9439008	Mrere Works	4.12	39.24	650	26	2161	1729	1049	26	20	52	109	255	102	71	70	69	104	98	73	23	B
9439009	Changamwe	4.02	39.38	200	26	2153	1722	1093	8	15	47	182	308	94	60	71	70	96	71	71	23	B
9439010	Msumbweni Hosp.	4.30	39.30	62	26	2171	1573	1376	20	16	62	293	356	142	111	79	66	93	86	52	30	B
9439013	Vanga Mudir's	4.40	39.13	40	26	2171	1737	1134	26	19	86	198	274	88	79	67	51	86	98	62	36	B
9439014	Gazi Mudir's	4.28	39.29	20	26	2175	1740	1388	21	18	69	275	377	133	108	81	66	86	104	50	35	B
9439015	Kwango Mudir's	4.08	39.19	650	26	2193	1754	814	20	33	52	119	150	55	58	49	39	84	105	50	27	B
9439016	Tiwi Disp.	4.14	39.35	30	26	2179	1743	1290	25	17	58	259	327	98	95	82	86	81	93	69	25	B
9439019	Mombasa Met. St.	4.03	39.39	52	26	2169	1735	1202	26	17	63	196	320	120	89	64	64	87	96	60	54	B
9439020	Ros Serani	4.05	39.41	30	26	2172	1737	1241	10	13	42	213	358	92	84	92	80	99	97	61	11	B
9439021	Mombasa Air.	4.02	39.37	185	26	2155	1724	1054	34	19	63	167	231	70	65	67	78	94	97	69	26	B
9439023	Bamburi	4.00	39.43	15	26	2173	1738	1146	0	7	15	228	253	89	150	58	81	118	46	101	3	B
9439024	Mkomani	4.03	39.41	50	26	2170	1736	969	2	1	0	143	178	83	117	71	61	91	91	131	2	B
9439025	Kinango Pump.	4.09	39.25	400	26	2193	1738	930	34	21	55	151	171	67	64	52	48	81	101	85	24	B
9439026	Kisauni	4.02	39.40	50	26	2178	1741	1096	20	8	40	236	275	88	98	62	63	65	80	61	11	B
9439027	Mwangulu	4.25	39.07	400	27	2243	1794	839	24	27	74	112	135	48	54	59	47	70	122	67	12	B
9439028	Ndavaja	4.15	39.10	500	27	2239	1791	810	32	21	61	109	134	47	67	64	42	76	103	54	22	B
9439029	Makuja	4.10	39.34	400	26	2151	1721	947	29	13	47	154	251	57	74	51	47	75	98	51	11	B
9439030	Muhaka	4.20	39.31	150	26	2173	1738	1129	23	19	50	204	260	104	93	79	59	93	105	40	19	B
9439031	Mrore I	4.13	39.25	1335	24	2081	1665	987	34	19	48	150	195	76	63	73	52	87	117	73	22	B
9439032	Mrore II	4.15	39.23	1160	25	2108	1686	1040	36	26	47	161	219	83	83	73	52	99	73	88	12	B
9439033	Mrore III	4.17	39.26	720	25	2139	1711	1094	13	26	53	154	237	93	96	83	50	130	75	84	10	B
9439034	Mrore IV	4.17	39.21	980	25	2132	1706	1077	30	26	45	162	219	84	96	79	50	101	77	108	10	B
9439038	Waa Disp.	4.10	39.35	100	26	2172	1738	1070	24	15	42	191	266	107	79	62	60	80	99	45	18	B
9439040	Mombasa Rest.	4.03	39.39	70	26	2167	1734	1246	54	12	71	267	241	110	86	67	85	81	105	67	10	B
9439041	Mombasa Fields	4.03	39.40	55	26	2169	1735	1145	47	16	58	239	233	114	85	61	75	73	87	57	11	B
9439043	Simba Hills	4.22	39.25	800	25	2120	1696	1290	44	13	71	223	270	106	104	81	66	127	122	63	19	B
9439044	Kikoneni	4.28	39.17	500	26	2172	1738	1242	25	14	92	209	234	117	107	89	70	84	124	77	16	B
9439045	Kimansi W.	4.03	39.39	50	26	2170	1736	1257	28	16	62	192	369	114	87	68	72	88	101	60	78	B
9439046	Vangalunga	4.33	39.07	200	27	2205	1764	911	31	21	77	146	176	61	51	44	38	72	123	71	20	B
9439050	Changamwe	4.01	39.37	100	26	2164	1731	860	31	47	46	87	211	65	80	0	42	83	109	59	2	B
9439051	Timbwani	4.07	39.40	50	26	2175	1740	814	1	0	63	154	228	130	69	41	38	25	24	41	2	B
9439054	Mwena School	4.29	39.08	250	27	2247	1798	752	21	11	75	62	99	90	72	44	38	99	83	58	3	B
9439057	Puma Camp	4.06	39.14	600	27	2226	1781	442	0	0	12	64	127	64	64	22	30	2	2	55	2	B

Stations 8535201 to 8940003 latitude North and stations 9034001 to 9439057 latitude South.
Temp: Mean daily temperature (celcius)
Eo: Potential evaporation (mm)
PET: potential evapotranspiration (mm)
P: Rainfall (mm)
RP type: Rainfall pattern type
M = Monomodal,
B = Bimodal,
T = Trimodal

Chapter 3 Climatic data bank

Chapter 3
Climatic data bank