PITSFORD HALL WEATHER STATION NORTHAMPTON UNITED KINGDOM CLIMATOLOGICAL OBSERVATIONS APRIL 2002 Observations at Pitsford Hall at 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th 21st 22nd 23rd 24th 25th 26th 27th 28th 29th 30th 0900 hours UTC Total Cloud 7 8 7 0 0 0 0 6 7 1 1 1 6 2 8 1 0 2 8 7 8 3 5 7 8 8 5 6 6 7 Wind Direction ssw sse se nne ene ene ene n nne ene nne nne ne nw ne nnw ssw ssw nw ssw ssw wsw wsw nnw nnw s nw ssw sw sw Speed (knots) 11 6 3 6 12 14 16 9 12 15 11 12 9 3 3 0 2 2 8 6 11 3 5 1 12 9 11 14 6 19 Weather 2 10 5 5 10 0 0 3 10 10 10 10 3 1 5 0 0 0 10 5 2 2 2 10 2 61 2 25 2 61 Visibility 7 5 6 5 5 7 7 7 5 5 5 5 6 7 6 6 8 8 4 6 6 7 7 5 6 4 7 8 8 6 Screen (C) Dry Bulb 11.5 11.0 14.1 11.7 9.3 6.8 7.5 6.9 7.2 9.1 8.9 7.6 5.5 9.1 7.2 8.0 7.5 8.8 8.6 13.0 12.5 15.0 13.5 12.5 13.3 9.0 11.4 11.6 10.4 11.0 Wet Bulb 9.9 9.4 11.2 10.0 7.6 4.7 5.5 5.0 6.0 6.7 6.9 5.0 4.7 7.0 6.0 5.9 6.0 7.1 8.0 9.9 10.6 14.5 12.0 11.0 11.0 8.5 10.0 9.7 8.7 10.8 Max 15.4 17.0 20.7 17.3 15.8 11.7 12.0 11.1 9.8 11.8 11.6 12.4 10.8 12.5 12.0 14.6 15.2 14.5 13.0 16.6 20.0 18.2 22.0 21.5 16.0 14.6 12.5 14.6 14.1 11.5 Min 9.1 8.2 8.3 4.4 4.4 3.4 2.0 0.5 1.3 3.9 2.3 0.9 1.0 0.0 6.0 0.2 1.6 2.8 4.9 2.1 7.2 7.5 7.0 8.5 7.0 6.5 3.1 7.1 4.6 5.2 Ground Observations Grass Min 8.8 8.3 5.6 1.5 3.0 1.5 0.4 -2.2 -1.6 1.5 0.3 -2.3 -2.0 -2.6 6.2 -2.6 -0.7 1.0 2.9 -0.4 5.0 2.5 6.0 6.0 6.5 7.0 2.6 5.6 1.9 3.0 Conc. Min 8.4 8.1 6.4 3.2 3.7 2.0 0.6 -0.5 -0.4 2.0 0.6 -0.6 -0.2 -0.5 6.3 -0.4 1.0 2.0 4.6 1.5 5.9 4.0 6.5 7.5 6.5 7.5 1.8 5.7 2.5 4.9 Bare Earth Min 8.7 8.3 7.0 4.0 4.5 2.6 1.2 0.5 0.6 2.7 1.5 0.3 0.2 0.0 6.3 0.1 1.3 2.4 5.0 2.0 6.3 6.2 6.0 8.0 7.5 7.0 _ 6.5 3.1 4.6 Soil/Earth Temperatures Surface 11.7 11.6 13.9 11.9 10.7 8.4 8.0 9.4 8.9 11.5 12.5 8.5 7.0 7.2 8.5 10.0 9.5 10.0 _ 13.6 12.8 17.5 14.5 10.1 _ 8.0 14.6 12.6 11.3 10.1 5cm 9.8 9.6 10.4 9.6 8.9 6.3 6.9 6.3 6.6 6.8 6.7 5.3 5.8 7.0 8.0 6.3 6.8 7.4 8.8 9.4 10.0 11.8 12.2 12.2 14.0 12.4 9.8 10.2 9.3 9.8 10cm 9.8 9.8 10.3 9.8 9.4 7.4 6.7 6.7 6.7 6.8 6.8 5.8 6.3 6.9 8.5 6.7 7.5 8.0 9.1 8.9 9.9 11.6 12.0 12.2 13.9 12.4 9.8 10.2 9.1 9.9 20cm 9.4 9.8 10.4 10.4 10.2 9.3 8.1 8.0 7.8 7.5 7.4 6.3 7.5 6.6 8.6 7.2 8.8 9.6 9.8 9.1 10.1 11.0 11.8 12.0 12.4 10.5 10.3 10.7 9.5 10.2 30cm 9.1 9.6 10.4 10.6 10.5 9.7 8.6 8.5 8.3 8.0 7.9 7.6 7.0 6.4 8.5 7.5 9.0 9.5 9.5 9.5 10.2 11.0 11.6 13.0 13.0 10.1 11.1 11.1 10.1 10.3 40cm 8.9 9.4 10.0 10.4 10.2 9.7 8.6 8.4 8.2 8.0 7.9 7.6 7.5 6.4 8.5 7.5 8.6 9.0 9.5 9.5 10.0 10.5 11.5 12.1 12.5 11.5 11.1 11.0 10.3 10.2 50cm 9.0 9.4 9.9 10.3 10.4 10.0 9.4 9.1 8.7 8.5 8.4 8.2 8.5 8.0 8.6 8.0 9.0 9.5 9.5 9.6 10.1 10.5 11.5 11.5 11.5 11.5 11.5 11.2 10.8 11.2 100cm 7.8 8.0 8.2 8.4 8.6 8.8 8.8 8.6 8.4 8.5 8.4 8.2 8.0 8.2 8.2 8.4 8.2 8.5 8.6 8.8 8.7 9.2 9.2 9.6 10.0 10.2 10.3 10.2 10.2 10.9 State of the Ground Without snow 0 0 0 0 0 0 0 9 9 9 9 9 9 9 9 9 9 2 2 9 9 9 9 9 9 1 1 1 1 1 With snow _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Snow depth _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ State of the Grass 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 3 3 1 0 0 0 0 0 0 1 3 3 2 State of the Concrete 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 0 0 0 0 1 1 3 Evaporation Hook-gauge reading 58.24 _ _ _ _ _ _ 41.48 _ _ 59.29 _ _ _ _ _ _ _ _ 48.08 _ _ _ _ _ _ 36.06 _ _ 62.32 Total evaporation (less rainfall) > > > > > > > 16.76 > > 5.06 > > > > > > > > 18.21 > > > > > > 21.62 > > 2.34 Rainfall Total _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1.2 5.7 0.1 _ _ _ _ _ 2.0 7.6 9.9 3.8 8.3 6.6 Duration _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2.0 2.3 _ _ _ _ _ _ 4.8 1.6 5.3 3.0 6.5 4.2 Acidity _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5.60 6.21 _ _ _ _ _ _ 5.72 6.46 6.66 6.59 6.10 6.11 Run of Wind Miles 146.48 81.03 80.67 114.35 171 244.8 131.85 70.75 121.26 146.89 97.87 125.4 79 87 43.7 38.1 167 91.82 59.62 120.23 215.46 124.82 80.87 105.57 135.5 191.82 179.56 242.69 238.84 233.22 Mean 7.9 4.4 4.4 6.2 9.3 13.3 7.1 3.8 6.6 8 5.3 6.8 4.3 4.7 2.4 2.1 9 5 3.2 6.5 11.7 6.8 4.4 5.7 7.3 10.4 9.7 13.1 12.9 12.6 Gust 24 17 17 20 24 31 28 16 23 31 21 28 26 <15 <15 <15 20 20 <15 16 19 17 13 16 18 44 26 38 42 29 Sunshine 3.4 2.0 9.0 9.4 9.7 9.3 9.4 5.1 2.2 10.8 5.8 8.0 4.7 5.9 0.5 9.4 5.6 6.6 3.8 5.1 9.8 5.1 9.1 9.1 8.5 4.5 6.4 7.9 4.5 3.2 Statistics Saturated VP(Twb) 1.22 1.18 1.331 1.229 1.044 0.855 0.904 0.873 0.936 0.982 0.995 0.873 0.855 1.002 0.936 0.929 0.936 1.009 1.073 1.22 1.279 1.652 1.403 1.313 1.313 1.11 1.229 1.204 1.126 1.296 VP 1.111 1.071 1.133 1.113 0.929 0.713 0.769 0.744 0.855 0.819 0.859 0.697 0.801 0.86 0.855 0.787 0.834 0.894 1.032 1.009 1.15 1.618 1.301 1.211 1.156 1.076 1.134 1.075 1.01 1.282 Saturated VP 1.358 1.313 1.61 1.376 1.172 0.989 1.037 0.995 1.016 1.156 1.141 1.044 0.904 1.156 1.016 1.073 1.037 1.133 1.118 1.499 1.45 1.706 1.548 1.45 1.528 1.149 1.349 1.367 1.262 1.313 RH % 81.8 81.6 70.4 80.9 79.3 72.1 74.2 74.8 84.2 70.8 75.3 66.8 88.6 74.4 84.2 73.3 80.4 78.9 92.3 67.3 79.3 94.8 84 83.5 75.7 93.6 84.1 78.6 80 97.6 Dew Point 8.5 8 8.8 8.5 5.9 7 7 7 7 4.1 4.8 1.8 3.8 4.8 4.7 3.5 4.4 5.3 7.4 7.1 9 14.2 10.9 9.8 9.1 8 8.8 8 7.1 10.6 Pressure 1012.9 1012.0 1006.4 1010.9 1008.6 1017.7 1024.0 1024.8 1026.7 1024.6 1016.4 1011.0 1013.0 1013.0 1017.3 1018.0 1015.3 1014.0 1019.7 1028.7 1032.6 1029.4 1032.0 1029.2 1024.9 1004.8 1009.2 991.7 995.5 993.7 Days with thunder _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ hail<5mm _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 1 _ hail>/=5mm _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ snow _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ fog _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _