September 2017 weather data

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(Jan 2018: updated to compare with Usk and not Ross-on-Wye)

September 2017 was unremarkable regarding rainfall and temperature. There were only 5 days without rain overall (defined as 0.2 mm or under) with many days being dull and damp but without too much precipitation: the total rainfall was 70.8 mm, some 13% below the Usk* average for September of 81.2 mm.

The month was cooler than average, with the mean maximum temperature of 17.3 °C being 1.9 °C below the Usk average for September of 19.2 °C. The highest was 21.0 °C on the 1st and the lowest of 14.2 °C occurred only two days later on the 3rd.

* Usk is the nearest Met Office station for which long term averages (1981-2010) are available.

Day by day data for September are given below:-

                   MONTHLY CLIMATOLOGICAL SUMMARY for SEP. 2017

NAME: Penallt 210 CITY: STATE:
ELEV: 210 m LAT: 51° 48' 00" N LONG: 2° 42' 00" W

TEMPERATURE (°C), RAIN (mm), WIND SPEED (km/hr)

HEAT COOL AVG
MEAN DEG DEG WIND DOM
DAY TEMP HIGH TIME LOW TIME DAYS DAYS RAIN SPEED HIGH TIME DIR
------------------------------------------------------------------------------------
1 14.0 21.0 16:30 7.9 6:00 4.7 0.3 0.2 0.2 6.4 14:30 ESE
2 13.8 20.6 13:30 7.3 6:30 4.7 0.2 0.0 0.2 8.0 15:00 ESE
3 12.6 14.2 00:00 11.2 10:00 5.8 0.0 9.4 2.1 16.1 10:30 SE
4 16.2 19.3 13:30 14.2 0:30 2.1 0.0 0.6 1.0 19.3 22:00 W
5 15.7 20.3 16:30 11.6 23:00 2.8 0.1 5.4 1.3 12.9 9:30 ESE
6 13.9 18.8 16:00 11.0 22:30 4.4 0.0 0.0 0.0 11.3 10:30 WNW
7 13.9 17.9 12:30 10.3 4:00 4.4 0.0 0.6 1.3 17.7 19:30 W
8 13.9 18.1 15:00 10.1 00:00 4.4 0.0 3.0 0.6 16.1 14:30 W
9 12.5 16.8 15:30 10.0 6:00 5.8 0.0 2.2 0.5 12.9 13:30 W
10 11.9 14.4 13:00 9.3 7:00 6.4 0.0 1.6 1.9 19.3 14:30 W
11 12.9 16.0 12:30 10.6 0:30 5.4 0.0 1.2 1.6 20.9 8:30 W
12 12.9 17.5 13:00 9.7 7:30 5.4 0.0 5.6 2.3 24.1 20:00 W
13 12.3 15.9 14:00 8.3 23:30 6.1 0.0 0.4 2.1 25.7 2:00 W
14 11.3 17.6 12:00 7.3 5:00 7.0 0.0 0.4 0.5 11.3 15:30 WNW
15 10.6 16.8 15:30 6.6 7:00 7.8 0.0 1.6 0.0 9.7 1:00 W
16 10.4 17.3 14:30 7.5 5:30 7.9 0.0 3.0 0.0 4.8 11:00 E
17 10.7 15.6 17:00 6.9 5:30 7.7 0.0 0.4 0.0 6.4 12:00 ENE
18 11.4 16.8 15:30 8.1 4:00 6.9 0.0 1.4 0.0 6.4 16:00 ESE
19 12.4 18.1 14:00 7.3 7:30 5.9 0.0 0.0 0.0 6.4 14:30 W
20 13.5 17.3 14:30 10.1 1:30 4.8 0.0 2.4 1.9 19.3 11:30 ESE
21 12.6 15.8 16:00 6.9 23:00 5.7 0.0 7.2 1.4 20.9 2:30 ESE
22 11.7 16.4 14:30 6.0 3:30 6.7 0.0 0.4 1.8 20.9 16:00 ESE
23 14.2 18.2 14:00 12.3 00:00 4.1 0.0 0.8 1.6 14.5 11:00 ESE
24 14.4 18.8 16:00 10.9 7:30 3.9 0.0 0.4 1.0 11.3 11:30 SE
25 14.4 15.6 15:00 13.7 22:30 3.9 0.0 1.6 0.0 3.2 1:00 ESE
26 14.6 18.2 15:00 12.5 4:30 3.7 0.0 0.2 0.2 8.0 11:00 ENE
27 14.4 17.4 13:30 13.3 5:00 3.9 0.0 7.2 2.3 19.3 20:30 SE
28 14.3 17.5 14:30 11.3 8:00 4.1 0.0 1.6 0.8 12.9 15:00 ESE
29 13.4 15.9 12:00 9.2 23:00 4.9 0.0 6.6 1.1 17.7 17:00 W
30 12.3 14.7 15:30 9.8 0:30 6.1 0.0 5.4 1.6 16.1 13:00 ESE
-------------------------------------------------------------------------------------
13.1 21.0 1 6.0 22 157.5 0.7 70.8 1.0 25.7 13 W

Max >= 32.0: 0
Max <= 0.0: 0
Min <= 0.0: 0
Min <= -18.0: 0
Max Rain: 9.40 ON 03/09/17
Days of Rain: 27 (> .2 mm) 11 (> 2 mm) 0 (> 20 mm)
Heat Base: 18.3 Cool Base: 18.3 Method: Integration