PITSFORD HALL WEATHER STATION, NORTHAMPTON, UNITED KINGDOM CLIMATOLOGICAL OBSERVATIONS DECEMBER 2001 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 31st 0900 hours UTC Total Cloud 8 3 9 3 9 5 7 0 0 9 9 0 8 2 3 8 8 8 6 0 8 0 4 8 8 2 8 1 8 8 0 Wind Direction wnw e s wsw s n s calm ene nne n n ne ne nne ene n n wnw nnw wnw nnw nw w calm wnw s nw nw nw nnw Speed (knots) 7 2 2 2 16 2 4 0 3 8 8 12 3 7 6 14 4 2 3 3 16 12 3 8 0 11 7 25 10 6 8 Weather 61 12 45 1 81 1 3 41 42 47 43 1 3 10 3 2 2 40 3 0 2 0 2 2 63 2 2 1 68 70 0 Visibility 6 4 3 7 5 6 6 3 4 2 3 7 5 5 5 8 5 4 5 6 7 8 7 7 8 8 7 7 7 8 7 Screen (C) Dry Bulb 8.9 0.6 4.2 8.3 9.0 2.1 7.4 1.9 0.7 1.9 3.8 4.1 6.1 -1.1 1.1 2.8 2.2 5.0 3.0 -0.1 5.2 -0.4 -3.1 5.1 2.5 -2.1 4.9 4.6 1.6 0.1 -4.8 Wet Bulb 8.8 0.4 4.0 7.4 9.0 2.0 6.8 1.8 0.7 1.6 3.7 3.2 5.6 -1.3 0.4 1.3 1.9 5.0 2.2 -0.6 4.4 -1.9 -3.2 4.7 2.3 -2.2 4.7 2.2 1.4 0.0 -5.4 Max 10.7 5.3 9.6 10.4 3.2 7.4 9.4 6.4 4.6 4.0 5.8 8.2 6.8 2.4 4.6 4.8 5.0 6.0 6.8 5.1 7.1 2.5 4.9 8.3 3.4 4.7 8.5 7.0 1.8 3.2 3.6 Min 8.6 -0.6 0.1 3.3 4.4 0.9 1.7 0.1 0.3 -0.1 1.2 1.0 3.9 -1.5 -1.7 0.7 -0.4 2.0 1.5 -1.4 -1.1 -2.1 -4.1 -3.5 2.1 -3.4 -2.2 4.2 0.7 -1.8 -4.7 Ground Observations Grass Min 8.1 -3.1 -0.6 4.3 4.6 3.1 _ -3.0 -1.8 -1.5 1.7 -2.1 0.2 -3.4 -4.9 -1.2 -4.1 1.0 -2.0 -4.9 -3.3 -6.8 -7.0 -5.1 1.6 -7.3 -4.4 -0.2 -1.9 -5.9 -8.0 Conc. Min 8.9 -1.6 1.4 1.5 0.5 -0.6 1.1 -1.5 -1.2 -3.6 -0.5 -1.1 2.2 -5.5 -4.3 -1.0 -2.6 0.5 -0.5 -3.4 -2.6 -5.5 -6.4 -5.0 2.3 -6.0 -4.3 1.5 -0.9 -4.1 -8.4 Bare Earth Min 9.6 0.2 0.3 2.3 2.9 -0.2 2.5 -1.4 -0.3 -0.4 1.8 -0.3 0.0 -1.6 -1.9 -0.5 -1.5 1.9 -0.4 -1.7 -1.5 -2.7 -2.6 -2.3 1.9 -3.1 -2.2 1.6 -0.2 -2.1 -3.4 Soil/Earth Temperatures Surface 10.0 4.9 4.5 6.9 7.0 3.4 5.4 2.1 1.3 0.3 4.4 3.2 5.5 0.1 0.7 2.4 2.0 1.0 3.0 0.0 4.1 0.1 -0.5 3.0 3.6 -0.1 2.9 2.6 1.8 0.4 -1.1 5cm 10.4 4.3 4.2 6.8 6.1 3.6 5.9 2.7 2.7 2.8 3.6 2.0 5.1 1.6 0.8 2.2 1.0 4.1 3.2 1.3 2.2 0.7 0.2 0.5 3.7 0.6 0.8 3.2 1.7 0.6 0.3 10cm 11.1 5.4 5.2 7.2 6.2 5.0 6.2 4.0 4.0 3.4 4.0 2.8 5.4 2.8 1.9 2.8 1.4 4.2 3.2 2.5 2.5 1.8 1.1 1.2 4.2 1.8 1.3 3.8 2.2 1.3 1.0 20cm 10.5 7.1 6.6 7.3 6.8 6.2 6.7 5.8 5.2 4.6 4.8 4.1 5.5 4.6 3.3 3.5 2.9 4.3 4.6 4.0 3.3 3.0 2.3 2.2 4.2 2.8 2.2 4.0 3.0 2.4 2.0 30cm 9.8 8.0 8.4 7.5 7.4 7.2 7.1 6.4 5.6 5.0 4.9 4.6 5.6 5.3 4.1 3.8 3.5 4.1 4.5 4.5 3.7 3.6 3.0 2.7 3.7 3.3 2.6 3.6 3.4 2.8 2.4 40cm 9.3 8.1 8.2 7.6 7.6 7.4 6.9 6.6 5.8 5.1 5.1 4.8 5.6 5.5 4.4 4.1 3.5 4.3 4.6 4.6 4.0 3.9 3.2 3.0 3.7 3.5 3.1 3.6 3.5 3.1 2.7 50cm 9.3 8.8 8.2 7.6 8.0 7.7 7.5 7.3 6.6 6.5 6.0 5.6 6.0 6.0 5.2 4.8 4.5 4.9 5.1 5.4 4.8 4.6 4.0 3.6 4.0 4.1 3.6 4.0 4.0 3.6 3.4 100cm 8.4 8.6 8.0 8.6 8.2 8.2 8.4 8.1 7.9 7.9 7.6 7.2 7.1 6.9 6.9 6.8 6.5 6.4 6.4 6.3 6.2 6.1 5.8 5.8 5.6 5.4 5.4 5.4 5.2 5.2 5.1 State of the Ground Without snow 2 1 1 1 1 1 1 1 1 1 1 4 1 4 4 1 4 1 1 4 1 4 4 1 1 4 1 1 1 _ _ With snow _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5 5 Snow depth _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 1 State of the Grass 3 7 1 1 1 1 1 7 7 1 2 4 0 7 7 1 4 1 1 5 4 7 5 4 3 5 3 1 3 9 9 State of the Concrete 2 0 1 1 1 0 1 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 1 2 0 1 0 1 1 0 Evaporation Hook-gauge reading 58.76 _ _ 62.24 _ _ _ 66.14 _ _ _ _ _ 65.09 _ _ _ _ _ 64.13 _ _ _ 63.91 _ _ _ 67.21 _ _ 65.99 Total evaporation (less rainfall) 0.22 > > 0.52 > > > 1.60 > > > > > 1.05 > > > > > 1.16 > > > 1.62 > > > 1.20 > > 2.12 Rainfall Total 0.3 tr 3.7 4.9 0.6 tr _ _ _ tr(fe) tr(fe) _ _ _ _ _ tr _ 0.2 tr(x) 1.1 _ 0.3 3.3 0.2 0.9 0.1 0.1 0.7 0.1 _ Duration 0.3 0.0 3.0 3.8 0.2 _ _ _ _ _ _ _ _ _ _ _ _ 0.5 _ 1.8 _ 0.1 2.5 0.1 0.5 _ _ 1.3 _ _ Acidity _ _ _ 6.83 6.74 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 6.05 _ _ _ _ _ _ _ Run of Wind Miles 62.42 27.16 201.79 133.65 221.89 62.72 81.61 31.99 69.89 69.54 82.92 122.54 113.56 57.05 87.84 85.32 64.79 50.19 135.9 116.34 179.54 162.16 113.67 150.42 122.05 118.13 201.32 147.16 145.23 127.77 52.56 Mean 3.4 1.5 10.9 7.2 12 3.4 4.4 1.7 3.8 3.8 4.5 6.6 6.2 3.1 4.8 4.6 3.5 2.7 7.4 6.3 9.7 8.8 6.2 8.1 6.6 6.4 10.9 8 7.9 6.9 2.8 Gust 24 <15 31 26 51 <15 15 <15 <15 15 21 24 19 <15 18 25 <15 <13 25 27 30 29 22 31 21 22 54 52 24 22 <15 Sunshine 2.2 2.0 0.0 5.3 0.6 2.2 0.3 6.1 5.3 0.0 4.1 4.3 0.0 6.6 2.1 0.1 0.0 0.0 5.3 3.0 0.0 6.0 4.9 0.0 0.0 4.0 1.7 5.7 2.5 4.8 6.5 Statistics Saturated VP(Twb) 1.133 0.629 0.814 1.03 1.149 0.706 0.989 0.696 0.643 0.686 0.797 0.769 0.91 0.556 0.629 0.671 0.701 0.873 0.716 0.585 0.837 0.532 0.483 0.855 0.721 0.52 0.855 0.716 0.676 0.611 0.409 VP 1.126 0.616 0.8 0.969 1.149 0.699 0.948 0.689 0.643 0.666 0.79 0.708 0.876 0.543 0.582 0.57 0.681 0.873 0.662 0.551 0.783 0.431 0.476 0.828 0.708 0.513 0.841 0.554 0.663 0.604 0.369 Saturated VP 1.141 0.638 0.825 1.095 1.149 0.711 1.03 0.701 0.643 0.701 0.802 0.819 0.942 0.564 0.662 0.747 0.716 0.873 0.758 0.607 0.885 0.593 0.486 0.879 0.732 0.524 0.867 0.849 0.686 0.615 0.428 RH % 98.7 96.6 97 88.5 100 98.3 92 98.3 100 95 98.5 86.4 93 96.3 87.9 76.3 95.1 100 87.3 90.8 88.5 72.7 97.9 94.2 96.7 97.9 97 65.3 96.6 98.2 86.2 Dew Point 8.7 0.1 3.8 6.5 9 1.9 6.2 1.7 0.7 1.2 3.6 2 5.1 -1.6 -0.7 -1 1.5 5 1.1 -1.4 3.5 -4.7 -3.4 4.2 2 -2.4 4.5 -1.3 1.1 -0.2 -6.7 Pressure 1009.7 1026.6 1022.5 1012.0 1010.5 1031.5 1034.8 1039.0 1039.9 1041.4 1041.2 1036.6 1034.8 1040.4 1040.1 1039.3 1040.7 1039.7 1034.7 1035.0 1017.2 1014.5 1021.7 1009.8 999.0 1009.9 1002.8 1000.9 1000.1 1009.1 1029.5 Days with thunder _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ hail<5mm _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ hail>/=5mm _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ snow _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 1 _ fog _ 1 1 _ _ _ _ 1 1 1 1 _ _ _ _ _ _ 1 _ _ _ _ _ _ _ _ _ _ _ _ _