Climatological Bulletin

Monthly and Annual values of specified elements over particular periods ending 1990. 
Station: IERSD, National Observatory of Athens (37 58'N, 23 43' E, 107m above sea level) 
Key:	Measurements taken from 1931 to 1960
Measurements taken from 1961 to 1990	

Data	Jan.	Feb.	Mar.	Apr.	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.	Year	
Mean ambient temperature (oC)	9.3	9.9	11.3	15.3	20.0	24.6	27.6	27.4	23.5	19.0	14.7	11.0	17.8	
	9.3	9.8	11.7	15.5	20.2	24.6	27.0	26.6	23.3	18.3	14.5	11.1	17.6	
Mean maximum ambient temperature (oC)	12.9	13.9	15.5	20.2	25.0	29.9	33.2	33.1	29.0	23.8	18.7	14.6	22.5	
	12.9	13.6	16.0	20.3	25.3	29.8	32.6	32.3	28.9	23.1	18.6	14.7	22.3	
Mean minimum ambient temperature (oC)	6.4	6.7	7.8	11.3	15.9	20.0	22.8	22.8	19.3	15.4	11.7	8.2	14.0	
	6.5	6.9	8.4	11.6	15.4	20.1	22.5	22.3	19.2	14.9	11.4	8.3	14.0	
Mean precipitation (mm)	58.8	36.5	37.5	22.0	22.5	13.6	5.7	7.0	15.3	51.0	55.7	71.1	396.8	
	44.6	48.3	42.6	28.2	17.2	9.7	4.2	4.6	11.9	47.7	50.6	66.6	376.1	
Average number of raining days	17	12	12	10	9	5	2	3	4	9	13	16	112	
	13	13	11	10	7	5	2	2	3	9	11	13	99	
Mean relative humidity (%)	74	70	67	63	59	53	47	47	56	67	73	75	63	
	72	71	68	62	58	52	48	49	56	66	73	73	62	
Mean atmospheric pressure (mmHg)	752.5	752.0	752.2	751.2	751.2	750.5	749.3	749.7	752.3	753.4	753.6	753.3	751.8	
	753.4	752.3	751.9	750.4	750.8	750.3	749.8	750.0	752.2	753.9	753.9	753.2	751.8	
Mean absolute humidity (mmHg)	6.6	6.5	6.8	8.0	10.1	11.8	12.4	12.5	11.9	10.8	9.2	7.5	9.5	
	6.4	6.5	7.0	7.9	9.7	11.4	12.4	12.4	11.7	10.3	9.0	7.3	9.3	
Mean cloudiness (octals)	6.1	5.5	5.6	4.8	4.6	2.9	1.4	1.3	2.4	4.3	5.7	5.9	4.2	
	5.5	5.8	5.4	4.9	4.3	3.2	2.0	2.0	2.8	4.1	5.3	5.6	4.2	
Mean sunshine duration (hours)	120	146	179	230	277	322	369	358	283	209	144	119	2756	
	138	145	187	239	303	341	374	356	283	218	164	136	2884	

Last updated 10-5-2005.

By: Dr. M. Petrakis and Dr. B. Psiloglou