ECN Rothamsted (ECN AWS T06 02, Harpenden)
The Weather : Monthly Summary : 2025
(Departure from the 30 year means (1991 - 2020) in brackets)
	Sunshine		Mean Temperatures, °C								Rain			Drainage	Wind ***
			Maximum		Minimum		Dew point	Ground	In ground under grass		Tipping Bucket			20"
								frosts*	10 cm	30 cm	Total		days**	Total
	Hours	(hours)	°C	(°C)	°C	(°C)	°C	#	°C	°C	mm	(mm )	#	mm	km/hr
January	66.3	(+2.43)	5.8	(-1.27)	0.3	(-1.32)	1.3	22	3.2	5.9	74.5	(+0.42)	17	11.8	6.2
February	73.2	(-12.95)	7.3	(-0.27)	1.9	(+0.42)	2.9	18	3.9	5.7	51.3	(-5.64)	18	12.0	7.3
March	205.2	(+76.80)	12.5	(+2.28)	2.7	(-0.20)	4.0	23	5.5	6.9	6.3	(-40.81)	9	0.1	6.7
April	256.2	(+84.19)	16.4	(+3.00)	5.0	(+0.46)	5.8	18	9.6	9.8	27.7	(-26.32)	7	1.7	7.2
May	244.7	(+41.38)	18.6	(+2.06)	8.2	(+0.88)	8.3	6	14.2	12.9	19.6	(-33.67)	6	0.0	8.0
June	268.9	(+63.10)	23.2	(+3.71)	12.2	(+2.05)	12.3	0	18.0	16.2	26.5	(-28.36)	10	0.0	7.5
July	215.1	(+8.23)	23.9	(+1.92)	14.0	(+1.63)	13.1	0	17.7	18.3	46.5	(-9.00)	10	0.2	6.2
August	212.9	(+23.55)	23.2	(+1.58)	12.2	(-0.10)	12.4	0	18.0	17.6	27.5	(-44.47)	9	0.0	6.0
September	174.1	(+23.36)	18.7	(+0.14)	9.7	(-0.44)	11.7	3	13.4	15.5	67.7	(+9.93)	16	10.1	4.8
October
November
December
Year	1716.5	(+310.08)	16.6	(+1.46)	7.3	(+0.38)	8.0	90.0	11.7	12.1	347.5	(-177.92)	102.0	36.0	6.7
* Number of nights grass minimum was below 0.0 °C
** Number of days rain was 0.2 mm or more
*** At 2 metres above the ground