| Date | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 5.9 | 6.3 | 0.0 | 3.2 | 9.0 |
| 2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.6 | 0.0 | 0.0 | 0.0 | 18.3 | 0.0 | 6.7 | 19.9 |
| 3 | 0.2 | 6.6 | 18.8 | 0.8 | 0.0 | 0.0 | 0.0 | 11.6 | 8.3 | 1.1 | 4.8 | 1.2 |
| 4 | 0.0 | 8.2 | 1.4 | 0.0 | 0.0 | 0.0 | 0.6 | 58.2 | 0.1 | 3.5 | 0.8 | 11.2 |
| 5 | 0.2 | 4.6 | 15.6 | 0.0 | 0.0 | 0.1 | 3.7 | 0.0 | 0.1 | 13.1 | 1.9 | 22.6 |
| 6 | 0.0 | 0.8 | 3.2 | 3.0 | 0.3 | 16.0 | 11.3 | 6.6 | 0.8 | 4.1 | 6.1 | 6.7 |
| 7 | 0.2 | 5.4 | 0.6 | 12.0 | 2.6 | 2.2 | 0.3 | 0.0 | 1.6 | 18.9 | 2.3 | 17.7 |
| 8 | 0.0 | 9.0 | 3.8 | 9.8 | 1.0 | 0.3 | 0.1 | 0.0 | 0.5 | 0.0 | 0.0 | 15.8 |
| 9 | 0.2 | 18.4 | 6.8 | 1.8 | 0.0 | 0.1 | 0.0 | 0.2 | 0.0 | 2.7 | 3.0 | 0.2 |
| 10 | 0.0 | 0.0 | 0.0 | 0.4 | 0.0 | 0.9 | 2.2 | 0.3 | 0.0 | 0.0 | 0.8 | 0.0 |
| 11 | 6.0 | 0.0 | 0.4 | 0.0 | 0.0 | 0.0 | 17.1 | 0.0 | 0.0 | 1.3 | 3.7 | 0.0 |
| 12 | 9.6 | 0.2 | 0.0 | 0.0 | 0.3 | 0.1 | 3.6 | 4.2 | 0.0 | 0.0 | 24.3 | 0.0 |
| 13 | 0.6 | 0.0 | 0.0 | 1.0 | 0.0 | 0.0 | 7.3 | 0.0 | 0.0 | 0.0 | 26.6 | 0.0 |
| 14 | 1.2 | 0.0 | 0.0 | 0.0 | 7.8 | 0.0 | 1.3 | 1.0 | 0.0 | 0.0 | 9.3 | 0.3 |
| 15 | 5.0 | 0.0 | 0.0 | 0.2 | 3.1 | 0.1 | 0.2 | 0.0 | 1.3 | 0.4 | 12.8 | 6.0 |
| 16 | 14.2 | 0.0 | 0.0 | 0.0 | 6.7 | 0.0 | 17.8 | 0.0 | 0.0 | 0.0 | 0.5 | 0.0 |
| 17 | 17.0 | 0.4 | 0.0 | 0.6 | 1.1 | 4.8 | 6.6 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| 18 | 7.0 | 2.8 | 0.0 | 0.2 | 0.4 | 0.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.3 | 0.0 |
| 19 | 0.2 | 0.4 | 0.0 | 0.0 | 0.2 | 0.3 | 1.5 | 1.4 | 0.0 | 2.5 | 11.5 | 2.4 |
| 20 | 0.0 | 0.2 | 0.0 | 0.0 | 0.1 | 0.0 | 11.4 | 0.0 | 0.0 | 27.2 | 2.7 | 0.0 |
| 21 | 22.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 16.6 | 2.2 | 0.0 | 12.1 | 27.5 | 0.2 |
| 22 | 8.8 | 0.0 | 0.2 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 12.0 | 11.7 | 0.2 |
| 23 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 1.3 | 1.0 | 12.3 | 6.3 | 14.3 |
| 24 | 10.0 | 0.0 | 0.2 | 0.2 | 0.2 | 0.0 | 3.6 | 1.6 | 0.0 | 1.7 | 12.7 | 0.7 |
| 25 | 3.0 | 0.0 | 0.4 | 1.4 | 0.0 | 17.6 | 0.0 | 1.0 | 0.0 | 0.0 | 8.0 | 4.2 |
| 26 | 0.4 | 0.0 | 0.6 | 10.6 | 4.6 | 0.0 | 13.0 | 15.2 | 0.0 | 3.2 | 0.6 | 0.9 |
| 27 | 5.6 | 0.0 | 0.0 | 5.2 | 4.8 | 0.0 | 1.6 | 0.5 | 0.0 | 0.2 | 7.1 | 0.0 |
| 28 | 1.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.3 | 2.0 | 1.0 | 0.0 | 0.0 | 20.2 | 3.9 |
| 29 | 7.8 | 0.0 | 3.0 | 0.0 | 0.9 | 34.8 | 0.0 | 0.0 | 0.0 | 11.5 | 13.2 | |
| 30 | 0.2 | 0.0 | 6.2 | 0.0 | 0.0 | 1.6 | 5.4 | 0.0 | 5.2 | 0.0 | 0.6 | |
| 31 | 0.0 | 0.0 | 0.0 | 7.9 | 0.1 | 21.8 | 0.0 | |||||
| Total | 121.4 | 57.0 | 52.2 | 57.0 | 33.8 | 43.7 | 167.6 | 117.7 | 38.3 | 143.3 | 227.9 | 152.2 |
| Total Year | 121.4 | 178.4 | 230.6 | 287.6 | 321.4 | 365.1 | 532.7 | 650.4 | 688.7 | 832.0 | 1059.9 | 1212.1 |
In late February 2009 I was lent a standard rain gauge.
Up till then I had always relied on the automatic weather station's
tipping bucket gauge to give the rainfall. But February brought snow,
which was hard for the AWS to cope with. So I got the standard rain
gauge, which managed, with some help from me in melting the snow it had
gathered, to give real figures.
Part of the deal for the loan of the rain gauge was that I should
compare the output of the AWS and the gauge. This revealed substantial
differences between the outputs, the AWS showing less precipitation
than the standard gauge. It occurred to me that it might be of interest
to others in the field of weather data collection to see the comparison
I have been making since the beginning of March 2009. So I give the
figures below.
I have marked the snow figures thus: *.
| Date | Jan | Feb | Mar | Apr | May | Jun | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | |
| 1 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 2 | 0.0 | 0.2 | -0.2 | 0.0 | 0.0 | 0.0 | 0.6 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 3 | 18.8 | 22.3 | -3.5 | 0.8 | 0.7 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 4 | 1.4 | 32.7* | -31.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 5 | 15.6* | 0.2 | 15.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | -0.1 | ||||||
| 6 | 3.2* | 0.1 | 3.1 | 3.0 | 3.3 | -0.3 | 0.2 | 0.3 | -0.1 | 15.2 | 16.0 | -0.8 | ||||||
| 7 | 0.6 | 0.6 | 0.0 | 12.0 | 12.8 | -0.8 | 3.0 | 2.6 | 0.4 | 2.2 | 2.2 | 0.0 | ||||||
| 8 | 3.8 | 3.3 | 0.5 | 9.8 | 12.8 | -3.0 | 0.8 | 1.0 | -0.2 | 0.2 | 0.3 | -0.1 | ||||||
| 9 | 6.8 | 7.8 | -1.0 | 1.8 | 2.0 | -0.2 | 0.0 | 0.0 | 0.0 | 0.2 | 0.1 | 0.1 | ||||||
| 10 | 0.0 | 0.0 | 0.0 | 0.4 | 0.5 | -0.1 | 0.0 | 0.0 | 0.0 | 0.8 | 0.9 | -0.1 | ||||||
| 11 | 0.4 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 12 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.3 | -0.1 | 0.2 | 0.1 | 0.1 | ||||||
| 13 | 0.0 | 0.0 | 0.0 | 1.0 | 1.1 | -0.1 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | ||||||
| 14 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 7.0 | 7.8 | -0.8 | 0.0 | 0.0 | 0.0 | ||||||
| 15 | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 3.2 | 3.1 | 0.1 | 0.2 | 0.1 | 0.1 | ||||||
| 16 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 6.8 | 6.7 | 0.1 | 0.0 | 0.0 | 0.0 | ||||||
| 17 | 0.0 | 0.0 | 0.0 | 0.6 | 0.7 | -0.1 | 1.2 | 1.1 | 0.1 | 4.8 | 4.8 | 0.0 | ||||||
| 18 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.2 | 0.4 | -0.2 | 0.0 | 0.0 | 0.0 | ||||||
| 19 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 0.2 | 0.3 | -0.1 | ||||||
| 20 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | -0.1 | 0.0 | 0.0 | 0.0 | ||||||
| 21 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 22 | 0.2 | 0.0 | 0.2 | 0.4 | 0.0 | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 23 | 0.0 | 0.05 | -0.05 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 24 | 0.2 | 0.2 | 0.0 | 0.2 | 2.7 | -2.5 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 25 | 0.4 | 0.3 | 0.1 | 1.4 | 2.0 | -0.6 | 0.0 | 0.0 | 0.0 | 12.6 | 17.6 | -5.0 | ||||||
| 26 | 0.6 | 0.7 | -0.1 | 10.6 | 16.4 | -5.8 | 4.6 | 4.6 | 0.0 | 0.2 | 0.0 | 0.2 | ||||||
| 27 | 0.0 | 2.0 | -2.0 | 5.2 | 5.9 | -0.7 | 4.0 | 4.8 | -0.8 | 0.0 | 0.0 | 0.0 | ||||||
| 28 | 0.0 | 0.0 | 0.0 | 0.2 | 0.05 | 0.15 | 0.0 | 0.0 | 0.0 | 0.2 | 0.3 | -0.1 | ||||||
| 29 | 0.0 | 0.0 | 0.0 | 3.0 | 3.7 | -0.7 | 0.0 | 0.0 | 0.0 | 0.8 | 0.9 | -0.1 | ||||||
| 30 | 0.0 | 0.0 | 0.0 | 6.2 | 6.5 | -0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||
| 31 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||||||||||||
| Totals | 52.2 | 70.85 | -18.65 | 57.0 | 71.85 | -15.35 | 29.4 | 33.8 | -4.4 | 37.8 | 43.7 | -5.9 | ||||||
| Date | Jul | Aug | Sep | Oct | Nov | Dec | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | AWS | StdG | Diff | |
| 1 | 0.0 | 0.0 | 0.0 | 3.8 | 5.9 | -2.1 | 6.4 | 6.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.4 | 3.2 | -2.8 | 8.4 | 9.0 | -0.6 |
| 2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 17.6 | 18.3 | -0.7 | 0.2 | 0.0 | 0.2 | 5.0 | 6.7 | -1.7 | 18.0 | 19.9 | -1.9 |
| 3 | 0.0 | 0.0 | 0.0 | 10.8 | 11.6 | -0.8 | 7.2 | 8.3 | -1.1 | 1.0 | 1.1 | -0.1 | 3.8 | 4.8 | -1.0 | 1.2 | 1.2 | 0.0 |
| 4 | 0.4 | 0.6 | -0.2 | 46.4 | 58.2 | -11.8 | 0.2 | 0.1 | 0.1 | 2.4 | 3.5 | -1.1 | 0.8 | 0.8 | 0.0 | 7.6 | 11.2 | -3.6 |
| 5 | 3.2 | 3.7 | -0.5 | 0.2 | 0.0 | 0.2 | 0.2 | 0.1 | 0.1 | 8.6 | 13.1 | -4.5 | 1.8 | 1.9 | -0.1 | 10.2 | 22.6 | -12.4 |
| 6 | 10.4 | 11.3 | -0.9 | 5.6 | 6.6 | -1.0 | 0.6 | 0.8 | -0.2 | 3.2 | 4.1 | -0.9 | 4.6 | 6.1 | -1.5 | 5.8 | 6.7 | -0.9 |
| 7 | 0.4 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 | 1.4 | 1.6 | -0.2 | 12.2 | 18.9 | -6.7 | 2.0 | 2.3 | -0.3 | 14.6 | 17.7 | -3.1 |
| 8 | 0.2 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.4 | 0.5 | -0.1 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 12.8 | 15.8 | -3.0 |
| 9 | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 0.2 | 0.0 | 0.2 | 2.0 | 2.7 | -0.7 | 2.2 | 3.0 | -0.8 | 0.2 | 0.2 | 0.0 |
| 10 | 2.0 | 2.2 | -0.2 | 0.2 | 0.3 | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 0.8 | -0.2 | 0.2 | 0.0 | 0.2 |
| 11 | 12.8 | 17.1 | -4.3 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 1.0 | 1.3 | -0.3 | 3.2 | 3.7 | -0.5 | 0.0 | 0.0 | 0.0 |
| 12 | 3.0 | 3.6 | -0.6 | 3.8 | 4.2 | -0.4 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 15.6 | 24.3 | -8.7 | 0.0 | 0.0 | 0.0 |
| 13 | 4.4 | 7.3 | -2.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 21.8 | 26.6 | -4.8 | 0.0 | 0.0 | 0.0 |
| 14 | 3.4 | 1.3 | 2.1 | 1.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 8.6 | 9.3 | -0.7 | 0.2 | 0.3 | -0.1 |
| 15 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 1.2 | 1.3 | -0.1 | 0.4 | 0.4 | 0.0 | 9.2 | 12.8 | -3.6 | 4.6 | 6.0 | -1.4 |
| 16 | 14.5 | 17.8 | -3.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 0.5 | 0.1 | 2.0 | 0.0 | 2.0 |
| 17 | 5.0 | 6.6 | -1.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 | 0.0 | 0.0 | 1.0 | -1.0 |
| 18 | 1.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 0.3 | 0.1 | 0.0 | 0.0 | 0.0 |
| 19 | 1.8 | 1.5 | 0.3 | 1.2 | 1.4 | -0.2 | 0.0 | 0.0 | 0.0 | 2.4 | 2.5 | -0.1 | 9.2 | 11.5 | -2.3 | 1.0 | 2.4 | -1.4 |
| 20 | 8.4 | 11.4 | -3.0 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 21.0 | 27.2 | -6.2 | 1.8 | 2.7 | -1.9 | 0.4 | 0.0 | 0.4 |
| 21 | 11.4 | 16.6 | -5.2 | 1.8 | 2.2 | -0.4 | 0.0 | 0.0 | 0.0 | 9.4 | 12.1 | -2.7 | 22.8 | 27.5 | -4.7 | 0.4 | 0.2 | 0.2 |
| 22 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 9.0 | 12.0 | -3.0 | 9.6 | 11.7 | -2.1 | 0.2 | 0.2 | 0.0 |
| 23 | 0.4 | 0.5 | -0.1 | 1.0 | 1.3 | -0.3 | 1.0 | 1.0 | 0.0 | 3.2 | 12.3 | -9.1 | 5.0 | 6.3 | -1.3 | 6.4 | 14.3 | -7.9 |
| 24 | 3.4 | 3.6 | -0.2 | 1.6 | 1.6 | 0.0 | 0.2 | 0.0 | 0.2 | 1.4 | 1.7 | -0.3 | 12.2 | 12.7 | -0.5 | 0.4 | 0.7 | -0.3 |
| 25 | 0.0 | 0.0 | 0.0 | 1.2 | 1.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 6.6 | 8.0 | -1.4 | 3.6 | 4.2 | -0.6 |
| 26 | 9.8 | 13.0 | -3.2 | 15.0 | 15.2 | -0.2 | 0.2 | 0.0 | 0.2 | 2.6 | 3.2 | -0.6 | 0.4 | 0.6 | -0.2 | 0.6 | 0.9 | -0.3 |
| 27 | 1.4 | 1.6 | -0.2 | 0.6 | 0.5 | 0.1 | 0.0 | 0.0 | 0.0 | 0.2 | 0.2 | 0.0 | 5.8 | 7.1 | -1.3 | 0.0 | 0.0 | 0.0 |
| 28 | 0.2 | 2.0 | -1.8 | 1.0 | 1.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 18.4 | 20.2 | -1.8 | 4.2 | 3.9 | 0.3 |
| 29 | 20.8 | 34.8 | -14.00 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 10.8 | 11.5 | -0.7 | 11.6 | 13.2 | -1.6 |
| 30 | 1.4 | 1.6 | -0.2 | 4.4 | 5.4 | -1.0 | 0.0 | 0.0 | 0.0 | 4.6 | 5.2 | -0.6 | 0.0 | 0.0 | 0.0 | 0.4 | 0.6 | -0.2 |
| 31 | 6.2 | 7.9 | -1.7 | 0.2 | 0.1 | 0.1 | 16.0 | 21.8 | -5.8 | 0.0 | 0.0 | 0.0 | ||||||
| Totals | 126.1 | 167.6 | -41.5 | 100.6 | 117.7 | -17.1 | 37.2 | 38.3 | -1.1 | 101.4 | 143.3 | -41.9 | 184.2 | 227.9 | -43.7 | 115.0 | 152.2 | -37.2 |