April 2011 weather data

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April 2011 was a remarkably warm and dry month. The total rainfall of 5.0 mm was only 10% of the Ross-on-Wye* average for April of 48.4 mm, and the average maximum temperature of 17.6 °C was 4.7 °C above the Ross average for April of 12.9 °C (about the same as for a normal early June).

Ross-on-Wye is the nearest Met Office station for which long term averages (1971-2000) are available.

Day by day data for April are given below:-

                   MONTHLY CLIMATOLOGICAL SUMMARY for APR. 2011

NAME: Penallt  
ELEV:   210 m  LAT:  51° 46' 43" N  LONG:   2° 41' 43" 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  11.9  15.1   13:30  10.5    7:30   6.4   0.0   1.2   4.2  29.0   15:30   SSE
 2  11.8  16.2   15:30   6.3   23:30   6.6   0.0   0.0   2.4  20.9    3:00   SSE
 3   8.8  13.4   16:00   5.7   00:00   9.5   0.0   0.8   1.0  14.5   12:00   SSE
 4   7.8  11.9   15:00   3.3    5:00  10.5   0.0   0.0   2.3  20.9   16:30    SE
 5  10.4  13.2   13:30   8.1    5:30   7.9   0.0   1.0   3.9  22.5    4:00    SE
 6  13.9  19.5   15:00  10.1   21:30   4.6   0.1   0.0   2.1  17.7   13:30    SE
 7  13.9  20.6   15:00   7.9    7:30   4.7   0.2   0.0   0.8   9.7   14:00   ENE
 8  12.7  19.5   16:00   5.7    7:00   5.7   0.1   0.0   0.6   9.7   14:00   ENE
 9  13.7  19.6   15:30   7.2    6:30   4.8   0.1   0.0   2.3  19.3   15:00   ENE
10  12.3  19.6   15:30   4.4    6:30   6.1   0.2   0.0   0.8  11.3   15:30   ENE
11  11.6  15.9   12:30   6.1   00:00   6.8   0.0   0.0   1.4  19.3   11:00   WSW
12   8.2  14.0   14:00   3.1    7:30  10.1   0.0   0.0   1.0  14.5    1:00    SW
13   6.7   8.9   13:30   4.3    2:00  11.7   0.0   1.8   1.4  19.3   14:30   SSE
14   9.9  14.1   16:30   6.6    1:30   8.4   0.0   0.0   1.1   9.7    4:30   SSE
15  11.0  15.6   16:00   7.3    7:00   7.3   0.0   0.0   0.6  16.1   17:00   SSE
16  11.1  16.5   15:00   4.7    6:30   7.3   0.0   0.0   0.2   6.4   14:00   SSE
17  12.7  19.4   14:30   6.5    6:30   5.7   0.1   0.0   1.0  11.3   23:00   ENE
18  12.2  17.1   14:00   6.9    6:30   6.1   0.0   0.2   1.4  20.9   15:00   ENE
19  13.2  21.2   15:30   4.9    6:00   5.7   0.4   0.0   0.8   9.7   15:00   ENE
20  14.6  21.7   17:00   7.9    4:00   4.3   0.6   0.0   1.0  11.3   14:00   ENE
21  16.0  23.2   16:30   9.2    6:00   3.4   1.1   0.0   1.3  14.5   15:00   ENE
22  15.9  23.4   15:30   7.7    6:30   3.1   0.7   0.0   1.0  14.5   14:30    SW
23  16.8  24.9   16:00  10.6   00:00   3.1   1.6   0.0   0.8  12.9   19:00     E
24  13.2  19.3   16:00   8.6    6:30   5.2   0.1   0.0   1.4  12.9   10:30   ENE
25  13.7  19.6   16:00   8.7    7:00   4.7   0.1   0.0   2.1  16.1   21:30   ENE
26  10.0  14.9   16:30   6.9    6:30   8.3   0.0   0.0   2.6  16.1   16:30   ENE
27  10.4  15.6   16:30   5.8    6:00   7.9   0.0   0.0   2.4  16.1   18:30   ENE
28   9.9  16.7   17:00   3.1    5:30   8.4   0.0   0.0   2.1  14.5    9:30   ENE
29  11.0  16.4   19:00   7.6    6:30   7.3   0.0   0.0   2.4  17.7   00:00   ENE
30  13.1  19.9   16:00   8.2    5:00   5.4   0.2   0.0   4.7  29.0   19:30   ENE
-------------------------------------------------------------------------------------
    11.9  24.9    23     3.1    12   196.9   5.3   5.0   1.7  29.0     1     ENE

Max >=  32.0:  0
Max <=   0.0:  0
Min <=   0.0:  0
Min <= -18.0:  0
Max Rain: 1.80 ON 13/04/11
Days of Rain: 5 (> .2 mm) 0 (> 2 mm) 0 (> 20 mm)
Heat Base:  18.3  Cool Base:  18.3  Method: Integration

** Degree Days

Although degree-days are most commonly used in agriculture, they are also useful in building design and construction, and in fuel use evaluation. The construction industry uses heating degree-days to calculate the amount of heat necessary to keep a building, be it a house or a skyscraper, comfortable for occupation. Likewise, cooling degree-days are used to estimate the amount of heat that must be removed (through air-conditioning) to keep a structure comfortable. Heating and cooling degree-days are based on departures from a base temperature, typically 65ºF (18ºC).

One heating degree-day is the amount of heat required to keep a structure at 65ºF when the outside temperature remains one degree below the 65ºF threshold for 24 hours. One heating degree-day is also the amount of heat required to keep that structure at 65ºF when the temperature remains 24ºF below that 65º threshold for 1 hour.

Likewise, one cooling degree-day is the amount of cooling required to keep a structure at 65ºF when the outside temperature remains one degree above the 65ºF threshold for 24 hours. One cooling degree-day is also the amount of cooling required to keep that structure at 65ºF when the temperature remains 24ºF above that 65º threshold for 1 hour.

Depending on the calculation method, both heating and cooling degree-days can accumulate in the same day. Also, note that there are no negative degree-days. If the temperature remains below the threshold, there is no degree-day accumulation.