December 2018 weather data

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December 2018 was much milder than usual and was wetter too. The average maximum temperature of 10.1°C was 1.7°C above the Usk average for December of 8.4°C. The maximum temperature exceeded 10°C on 14 days and there were 4 days of air frost too.

It must be pointed out that data were lost for the first 22 days in the month and have been substituted by results obtained by Colin Harris in Over Monnow as the best available - for which many thanks. However, it is likely that some minimum temperatures will be significantly lower than those at Pentwyn due to temperature inversion effects, and maximum temperatures will often differ by a degree or so too, owing to the 200 m height difference between the stations.

There were 12 days when no significant rain was recorded (<0.2 mm); the total rainfall was 196.2 mm, 61% above the Usk* average for December of 121.9 mm.

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

Day by day data for December are given below:-


                   MONTHLY CLIMATOLOGICAL SUMMARY for DEC. 2018

NAME: Penallt210   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  10.4  12.7   12:15   7.3    0:30   7.9   0.0  19.0   0.5  12.0   14:45   SSW
2 12.8 13.7 12:00 10.9 0:15 5.6 0.0 1.6 0.4 11.0 9:30 SSW
3 8.7 12.3 11:00 0.7 00:00 9.7 0.0 9.8 0.4 12.0 6:30 NW
4 1.9 4.7 17:15 -1.8 8:00 16.4 0.0 11.4 0.0 2.0 23:45 W
5 8.8 12.2 12:15 4.2 0:15 9.6 0.0 15.0 0.1 10.0 12:15 S
6 11.6 12.9 16:45 7.1 0:15 6.8 0.0 1.6 0.4 7.0 9:45 NW
7 9.4 12.7 0:45 5.1 17:30 8.9 0.0 17.6 0.7 13.0 20:45 S
8 9.7 13.1 13:30 8.1 18:00 8.6 0.0 2.4 0.8 11.0 13:45 S
9 9.1 11.1 10:15 5.8 19:45 9.3 0.0 2.0 0.6 16.0 12:15 NW
10 6.7 9.6 14:45 1.8 00:00 11.6 0.0 0.0 0.0 6.0 2:45 WNW
11 6.1 8.9 14:45 0.9 2:00 12.3 0.0 0.0 0.4 7.0 19:00 ESE
12 7.1 8.6 13:00 3.8 23:30 11.2 0.0 0.0 1.2 14.0 17:00 SSW
13 2.9 5.6 13:45 -2.7 23:30 15.4 0.0 0.0 0.8 12.0 10:00 S
14 0.5 4.1 14:00 -3.4 1:45 17.8 0.0 0.0 0.5 8.0 16:45 SSW
15 5.2 8.9 19:45 2.9 0:30 13.2 0.0 25.2 1.3 18.0 15:45 SSW
16 5.9 8.1 14:30 3.1 00:00 12.4 0.0 13.8 0.0 4.0 0:30 WNW
17 5.2 11.1 22:45 -1.2 7:30 13.1 0.0 0.4 0.3 9.0 19:15 SSW
18 9.1 11.5 2:45 5.7 21:45 9.2 0.0 41.8 1.4 14.0 5:30 SSW
19 7.0 8.7 13:00 5.3 0:45 11.3 0.0 18.4 0.1 8.0 12:30 SSW
20 7.5 9.4 11:45 5.1 7:45 10.8 0.0 11.4 0.1 11.0 17:45 SSW
21 10.7 12.4 6:15 8.1 1:30 7.6 0.0 2.8 0.5 12.0 7:15 NW
22 8.3 11.1 12:45 3.8 23:45 10.1 0.0 0.0 0.1 7.0 9:30 S 23 8.6 11.7 14:00 5.9 22:00 5.1 0.0 1.2 0.0 6.4 0:30 ENE 24 5.5 6.3 14:30 4.7 8:00 12.8 0.0 0.0 0.5 12.9 20:30 ENE 25 7.7 8.9 00:00 5.3 0:30 10.7 0.0 0.4 0.0 4.8 10:00 SE 26 8.7 9.6 13:00 7.6 00:00 9.6 0.0 0.0 0.0 6.4 12:30 ESE 27 7.4 9.2 14:30 4.4 7:30 10.9 0.0 0.0 0.0 1.6 0:30 W 28 7.7 9.8 14:00 3.8 8:00 10.6 0.0 0.0 0.0 6.4 12:30 W 29 10.2 13.3 12:00 8.3 22:30 8.2 0.0 0.4 0.3 16.1 2:30 W 30 8.6 9.9 11:00 6.7 20:00 9.8 0.0 0.0 0.0 8.0 3:30 W 31 8.2 9.1 13:00 7.7 00:00 10.2 0.0 0.0 0.0 8.0 16:00 W ------------------------------------------------------------------------------------- 7.6 13.3 29 -2.7 28 87.8 0.0 196.2 0.1 16.1 29 W Max >= 32.0: 0 Max <= 0.0: 0 Min <= 0.0: 0 Min <= -18.0: 0 Max Rain: 41.8 ON 18/12/18 Days of Rain: 19 (> .2 mm) 13 (> 2 mm) 2 (> 20 mm) Heat Base: 18.3 Cool Base: 18.3 Method: Integration