Birr 1961-1990 averages
TEMPERATURE (degrees Celsius)	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
mean daily max.	7.5	7.9	9.8	12.2	14.9	17.7	19.2	18.8	16.6	13.6	9.7	8.2	13.0
mean daily min.	1.8	1.8	2.5	3.5	5.9	8.7	10.7	10.3	8.5	6.7	3.1	2.5	5.5
mean	4.6	4.8	6.1	7.9	10.4	13.2	14.9	14.6	12.6	10.1	6.4	5.4	9.3
absolute max.	13.8	15.0	19.7	23.7	25.7	31.2	30.8	29.3	24.5	22.3	17.5	15.3	31.2
absolute min.	-14.6	-10.5	-10.5	-4.6	-2.2	-0.3	3.1	1.2	-1.0	-3.4	-7.2	-9.4	-14.6
mean no. of days with air frost	9.0	7.7	7.0	4.2	1.0	0.1	0.0	0.0	0.3	1.5	7.1	7.8	45.7
mean no. of days with ground frost	17.0	15.1	13.6	11.8	6.1	1.2	0.1	0.2	2.0	4.9	13.0	15.0	99.9
RELATIVE HUMIDITY (%)
mean at 0900UTC	90	89	87	82	77	78	80	84	86	89	90	90	85
mean at 1500UTC	83	76	71	65	64	66	67	68	71	76	80	84	73
SUNSHINE (hours)
mean daily duration	1.60	2.31	3.18	4.64	5.32	4.80	4.24	4.16	3.58	2.67	2.03	1.41	3.33
greatest daily duration	7.2	9.2	11.7	13.6	15.2	15.6	15.2	13.8	11.3	9.7	8.1	6.7	15.6
mean no. of days with no sun	11	7	5	3	2	2	3	2	4	6	9	12	66
RAINFALL (mm)
mean monthly total	75.9	54.0	61.3	52.5	61.7	55.2	59.1	77.6	70.6	83.5	74.1	78.6	804.2
greatest daily total	28.6	35.3	25.9	30.9	26.3	27.5	39.5	42.2	25.6	40.3	25.9	47.1	47.1
mean no. of days with >= 0.2mm	19	15	18	15	17	16	15	17	17	18	18	19	204
mean no. of days with >= 1.0mm	14	11	13	11	13	11	10	13	12	14	13	14	148
mean no. of days with >= 5.0mm	6	4	4	4	5	3	4	5	5	6	5	6	57
WIND (knots)
mean monthly speed	8.0	8.1	8.1	7.0	6.7	6.1	5.8	6.0	6.6	7.2	7.1	7.9	7.0
max. gust	85	77	62	58	55	49	49	58	81	65	60	69	85
max. mean 10-minute speed	51	40	36	34	31	28	27	35	39	40	34	43	51
mean no. of days with gales	0.4	0.4	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.0	0.2	1.2
WEATHER (mean no. of days with...)
snow or sleet	4.9	3.8	2.7	1.1	0.1	0.0	0.0	0.0	0.0	0.0	0.6	2.6	15.9
snow lying at 0900UTC	3.1	1.9	0.8	0.2	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.6	6.6
hail	0.6	0.9	2.6	1.8	1.1	0.3	0.0	0.2	0.2	0.2	0.5	0.3	8.7
thunder	0.1	0.1	0.3	0.3	0.6	1.1	1.0	0.7	0.5	0.2	0.2	0.1	5.2
fog	3.2	1.8	1.7	2.4	1.2	1.4	1.9	3.2	3.3	3.6	2.8	3.4	29.9