U.S. Geological Survey Open-File Report 09-0346
Trends in Precipitation Chemistry in the United States,
1983-1994: An Analysis of the Effects in 1995 of Phase I of the Clean Air Act Amendments of 1990, Title IV
Table A.12. Comparison of 1983-1994 mean annual and bi-monthly precipitation at NADP/NTN sites with 1995
precipitation observations.
January- March- May- July- September- November-
Annual February April June August October December
____________ ___________ ___________ ___________ ___________ ___________ ___________
Precip. Precip. Precip. Precip. Precip. Precip. Precip.
(Inches) (Inches) (Inches) (Inches) (Inches) (Inches) (Inches)
____________ ___________ ___________ ___________ ___________ ___________ ___________
Region Site Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995
---------------------------------------------------------------------------------------------------------------
NE il11 35.54 31.37 2.93 2.22 5.94 6.05 6.69 11.60 7.17 4.74 6.40 3.86 6.41 2.90
il18 34.23 32.51 1.95 2.14 4.72 5.61 7.53 8.14 8.63 7.20 6.39 5.56 5.01 3.86
il63 50.09 53.35 6.84 8.40 9.18 11.50 8.57 14.09 7.09 8.16 8.27 4.10 10.14 7.10
in20 35.88 28.60 3.60 3.40 5.46 6.65 6.85 8.87 7.31 3.03 6.58 3.03 6.09 3.62
in34 37.45 33.12 3.21 4.26 5.55 7.49 7.34 5.24 7.53 8.10 7.42 3.77 6.41 4.26
in41 36.27 28.87 2.95 1.47 6.52 6.08 6.17 8.91 7.84 3.75 6.55 5.55 6.25 3.11
ky03 44.16 42.16 7.32 3.62 6.93 9.03 8.18 14.31 8.29 4.98 5.84 7.18 7.60 3.04
ky22 45.05 42.42 6.81 8.89 7.81 6.44 8.66 10.83 8.80 2.93 5.70 6.46 7.26 6.87
ky38 48.68 42.81 9.29 8.07 7.35 7.84 8.00 9.17 7.14 7.37 6.98 4.25 9.93 6.11
ma08 48.47 44.78 6.25 5.68 8.13 4.07 8.22 6.88 9.46 4.58 8.12 16.42 8.29 7.15
ma13 42.72 32.45 5.73 4.58 7.80 3.90 6.35 3.45 7.46 3.62 7.03 9.32 8.35 7.58
md03 39.17 38.94 5.53 5.82 6.88 4.13 6.45 5.70 7.03 6.11 6.46 9.78 6.82 7.40
md13 39.36 39.80 5.85 5.39 7.52 5.07 6.53 7.93 7.48 4.57 5.95 10.83 6.03 6.01
me00 36.06 34.71 4.51 8.10 4.81 4.55 6.65 3.36 7.73 4.75 6.22 7.39 6.14 6.56
me09 42.72 45.47 5.15 5.93 7.87 3.96 7.91 7.30 7.77 7.20 6.98 10.40 7.04 10.68
mi09 32.27 37.62 3.13 2.80 4.99 6.30 5.04 4.80 5.93 9.20 7.46 9.58 5.71 4.94
mi26 40.40 31.72 3.34 2.27 6.36 5.10 6.92 5.38 8.35 9.13 9.17 5.28 6.26 4.56
mi53 40.59 34.65 4.47 5.29 6.09 5.25 6.59 3.51 6.96 6.75 9.48 6.36 7.00 7.49
mi98 33.85 37.52 3.14 3.54 4.93 6.43 5.29 5.10 6.53 4.73 7.89 13.33 6.07 4.39
mi99 31.04 34.55 3.13 4.51 3.56 3.89 6.12 5.27 6.19 5.60 6.15 10.52 5.90 4.76
nh02 46.35 45.54 6.20 5.99 7.15 4.79 8.17 4.23 8.91 10.85 7.65 11.22 8.27 8.46
nj99 45.25 39.11 5.79 5.79 8.19 4.19 7.81 3.92 9.18 6.12 6.35 12.26 7.93 6.83
ny08 32.71 29.51 2.78 3.02 5.79 2.94 6.26 2.07 6.25 8.74 6.55 8.49 5.07 4.25
ny20 42.00 41.16 5.23 6.28 6.95 3.62 6.99 2.12 7.08 9.49 8.06 11.87 7.68 7.78
ny52 52.47 42.14 7.40 4.61 7.92 3.11 7.86 3.59 8.30 5.61 10.05 14.31 10.94 10.91
ny65 31.01 26.06 2.41 3.41 5.27 3.31 6.22 3.94 6.81 2.64 5.82 9.49 4.47 3.27
ny68 51.53 49.17 6.95 7.42 9.53 6.28 8.32 6.53 9.23 5.00 8.10 14.71 9.40 9.23
ny98 43.59 42.95 5.65 6.06 7.09 4.31 7.41 3.11 8.01 9.39 8.54 12.68 6.88 7.40
ny99 50.17 42.12 5.98 5.69 8.51 5.10 9.58 2.48 9.05 6.69 8.23 14.23 8.82 7.93
oh17 35.18 47.17 3.87 7.82 6.08 6.22 6.20 11.13 7.01 11.94 5.18 4.72 6.84 5.34
oh49 37.82 41.02 4.40 7.28 7.01 6.40 6.66 8.14 7.55 6.84 5.15 6.57 7.06 5.79
oh71 33.41 33.16 3.21 4.80 5.49 4.42 6.36 6.53 7.18 8.15 5.60 5.73 5.57 3.53
pa15 40.11 37.19 4.84 5.00 7.24 3.75 6.74 8.43 7.87 3.20 6.02 10.89 7.40 5.92
pa29 50.31 38.16 5.81 5.44 8.86 5.28 9.15 7.73 8.95 5.12 8.15 8.23 9.39 6.36
pa42 42.32 33.43 5.13 4.51 7.92 3.94 7.87 7.41 7.37 2.82 6.45 8.91 7.56 5.84
pa72 45.84 36.55 5.66 4.27 7.75 6.55 8.62 2.71 8.81 4.97 8.23 10.53 6.77 7.52
va00 44.58 47.35 5.83 6.64 7.70 4.28 7.68 12.57 9.51 6.96 6.34 10.11 7.52 6.79
va13 37.68 41.47 4.96 8.78 7.69 4.24 6.63 9.44 6.97 5.78 5.75 6.82 5.69 6.41
va28 54.57 64.97 7.15 11.03 9.68 5.22 9.08 14.11 9.38 13.80 8.48 13.73 10.80 7.08
vt01 41.00 38.45 4.53 4.93 6.97 5.43 7.45 4.31 8.53 9.00 6.61 8.69 6.91 6.09
vt99 44.09 46.32 4.41 3.89 6.76 4.71 7.27 3.76 10.23 15.40 8.72 12.71 6.70 5.85
wi28 27.34 30.29 0.88 0.61 3.50 3.41 6.43 3.89 7.02 13.49 6.70 6.69 2.81 2.20
wi36 31.09 31.95 1.84 0.91 3.89 4.01 6.39 5.89 7.58 9.74 7.52 8.54 3.88 2.86
wi37 30.02 32.87 1.12 0.54 4.05 4.68 6.79 4.81 8.70 14.00 6.69 7.05 2.68 1.79
wi99 32.05 35.15 2.63 2.31 5.13 5.86 5.53 5.76 7.12 10.94 6.61 5.57 5.03 4.71
wv04 47.21 44.13 6.73 9.04 8.74 6.26 7.97 10.86 9.10 5.19 6.79 7.13 7.89 5.65
wv18 49.92 41.92 6.71 5.81 8.85 5.45 9.42 7.82 9.34 9.89 7.15 5.84 8.43 7.11
-------------------------------------------------------------------------------------------------------
SE al10 46.00 60.37 9.16 10.35 7.55 11.09 6.61 4.23 8.01 6.99 5.55 15.16 9.13 12.55
fl03 51.18 54.55 7.83 4.51 7.86 8.50 8.77 11.37 12.62 19.13 9.16 6.60 4.94 4.44
fl11 50.41 67.81 4.41 3.50 4.57 4.24 14.23 20.45 13.40 19.93 11.03 18.21 2.76 1.48
fl41 50.01 59.75 4.54 4.43 7.32 7.33 10.79 12.21 14.98 21.49 8.71 10.70 3.67 3.59
ga41 46.16 42.29 8.41 10.27 8.21 3.66 6.16 2.61 9.09 6.28 6.36 10.77 7.94 8.70
ms10 52.36 50.03 10.60 3.68 9.29 16.42 8.05 6.30 7.49 7.15 6.85 5.92 10.08 10.56
ms30 53.40 55.52 8.63 11.07 9.14 14.35 9.78 5.80 7.19 11.06 7.32 3.69 11.33 9.55
nc03 45.74 48.29 6.89 7.98 7.60 6.11 7.37 8.52 11.68 9.13 6.88 10.35 5.32 6.20
nc25 69.54 72.69 13.20 17.03 12.57 8.37 10.16 10.15 10.56 12.16 10.29 15.18 12.76 9.80
nc34 41.43 52.25 7.01 8.39 8.11 3.19 6.78 10.93 6.72 12.58 6.56 11.52 6.26 5.64
nc36 46.22 49.36 6.87 10.08 6.58 4.29 7.68 9.78 12.23 10.47 6.52 10.46 6.35 4.28
nc41 42.17 52.11 7.00 10.81 7.01 5.20 7.83 10.05 8.71 8.63 6.06 11.78 5.55 5.64
sc06 43.76 56.26 6.78 10.10 6.02 5.42 6.76 9.27 10.60 17.08 8.24 7.86 5.36 6.53
tn00 51.04 49.24 9.10 10.69 8.37 7.64 8.58 7.88 8.56 4.32 6.55 8.98 9.88 9.73
tn11 57.10 55.68 9.87 12.35 10.23 7.48 9.71 10.93 11.13 4.65 6.24 9.98 9.93 10.29
---------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------
January- March- May- July- September- November-
Annual February April June August October December
____________ ___________ ___________ ___________ ___________ ___________ ___________
Precip. Precip. Precip. Precip. Precip. Precip. Precip.
(Inches) (Inches) (Inches) (Inches) (Inches) (Inches) (Inches)
____________ ___________ ___________ ___________ ___________ ___________ ___________
Region Site Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995 Mean 1995
---------------------------------------------------------------------------------------------------------------
West ar02 56.06 39.89 9.80 8.63 9.66 10.17 8.79 5.55 7.06 5.23 9.31 3.61 11.44 6.70
ar03 57.29 42.84 8.17 8.46 10.41 8.24 9.33 10.22 8.55 5.35 8.99 4.95 11.83 5.62
ar27 46.42 42.74 4.97 5.42 8.93 10.56 8.98 10.73 5.46 4.56 9.25 6.44 8.83 5.03
az03 14.60 19.86 3.13 6.18 2.63 5.14 0.88 0.52 3.16 4.53 2.29 2.66 2.51 0.83
co00 7.81 7.03 0.54 0.19 1.17 1.30 1.25 0.84 2.29 2.85 1.33 1.64 1.23 0.21
co02 58.62 90.10 12.83 17.94 14.52 26.21 5.33 15.66 4.99 4.30 4.60 6.60 16.36 19.39
co15 13.08 16.51 1.66 1.19 2.44 4.17 2.21 5.14 2.20 1.80 2.41 2.95 2.16 1.26
co19 15.21 20.44 1.32 1.42 3.43 4.95 3.31 7.25 2.92 2.83 2.19 2.21 2.03 1.78
co22 12.45 15.95 0.59 0.36 2.28 1.35 3.38 9.58 3.54 2.09 1.75 2.24 0.90 0.33
co97 35.52 59.00 6.57 11.69 7.90 14.10 4.27 10.25 4.54 3.78 4.74 6.86 7.50 12.32
co98 40.25 52.60 6.21 7.90 9.75 13.60 5.79 12.29 5.39 5.77 5.89 5.89 7.23 7.15
co99 18.79 16.91 3.01 2.98 3.20 5.32 1.72 1.69 3.82 3.55 3.34 2.07 3.71 1.30
ia08 32.09 30.00 1.99 0.70 5.83 7.54 6.91 6.71 7.27 7.62 6.06 4.40 4.03 3.03
ia23 35.24 36.35 1.76 1.10 5.12 7.01 7.39 14.48 10.40 6.82 7.37 4.48 3.20 2.46
id03 12.03 17.58 2.29 2.61 1.97 4.59 2.43 6.30 1.68 1.01 1.47 0.48 2.20 2.59
id11 9.72 12.87 1.95 1.92 1.98 2.60 2.12 3.05 0.57 1.30 1.11 0.77 2.00 3.23
ks31 32.39 39.10 1.61 0.93 4.97 7.81 8.53 19.06 8.88 5.99 5.52 3.94 2.88 1.37
ks32 18.64 20.55 1.11 0.86 2.70 3.27 5.31 10.01 6.10 4.30 2.25 1.93 1.17 0.18
la12 59.82 62.50 10.97 3.78 8.27 15.37 12.70 7.27 11.87 12.87 8.51 10.36 7.49 12.85
la30 62.85 68.27 12.78 11.91 10.55 18.22 11.44 14.09 11.39 6.81 7.20 7.15 9.49 10.09
mn16 30.45 35.03 1.65 1.92 3.32 2.54 7.99 4.76 8.93 11.09 5.78 11.22 2.78 3.50
mn23 27.51 32.67 1.13 1.56 4.09 5.18 8.14 5.18 6.99 9.16 4.97 9.65 2.20 1.94
mo03 42.55 51.17 3.65 5.57 7.51 7.79 8.21 17.90 8.54 14.29 6.94 2.84 7.71 2.78
mt00 12.47 13.34 0.71 1.20 2.31 3.30 3.64 4.07 2.28 1.99 2.42 1.99 1.12 0.79
mt05 30.18 41.33 5.27 6.71 4.24 4.54 5.56 7.37 3.21 5.58 4.51 6.48 7.39 10.65
nd08 17.55 22.88 1.01 1.40 1.64 1.65 5.50 2.69 5.76 9.79 2.27 4.50 1.38 2.85
nm07 17.66 12.33 1.93 1.59 2.16 2.04 2.50 2.09 5.31 4.61 3.46 1.60 2.30 0.40
nm08 21.87 16.67 1.49 1.27 1.08 0.38 4.03 2.79 9.15 8.27 3.77 3.73 2.34 0.23
nm09 13.71 12.14 1.41 1.83 1.89 2.99 1.69 1.49 3.83 4.03 2.79 1.50 2.10 0.30
ok00 28.36 33.81 1.94 0.75 4.36 5.75 7.87 9.50 6.17 14.83 5.01 1.87 3.01 1.11
ok17 38.62 34.20 3.75 2.30 6.76 6.03 9.13 12.69 5.17 3.83 8.72 5.40 5.08 3.95
or09 9.50 12.55 1.60 1.74 1.61 3.54 1.89 2.35 1.16 0.73 1.31 0.24 1.92 3.95
or10 80.17 95.49 21.23 25.15 16.77 17.38 7.59 6.91 2.00 3.58 7.63 9.94 24.95 32.53
or18 21.11 27.04 4.20 4.22 4.17 6.04 4.24 5.04 1.70 2.41 2.20 2.21 4.60 7.12
or97 31.81 47.14 8.13 12.61 5.19 9.28 3.54 2.75 1.30 1.30 3.07 6.38 10.58 14.82
sd08 16.58 18.67 0.49 0.78 2.35 3.51 7.07 9.19 3.91 1.54 2.07 3.19 0.68 0.46
sd99 21.27 26.07 0.80 0.40 3.56 6.78 7.44 7.72 5.40 6.17 3.14 4.42 0.94 0.58
tx03 30.00 18.30 3.63 0.65 5.45 3.55 7.71 2.40 3.91 5.30 5.56 3.18 3.75 3.22
tx10 41.86 31.49 6.57 5.67 6.60 6.05 10.60 6.97 4.73 5.97 6.51 2.80 6.85 4.03
tx16 22.46 20.25 2.41 1.39 2.31 2.48 5.47 5.46 4.83 4.51 4.71 4.24 2.74 2.17
tx21 50.28 39.36 7.86 7.98 8.14 12.67 9.85 6.48 5.85 4.41 7.68 3.72 10.89 4.10
tx56 35.75 25.36 4.40 1.43 5.28 5.91 9.32 7.28 4.28 7.33 7.57 2.33 4.91 1.08
wa14 127.16 122.35 34.12 35.25 21.70 24.29 11.11 7.22 5.46 6.35 16.84 20.19 37.94 29.05
wa21 35.55 44.86 7.90 8.09 6.30 9.99 4.89 3.40 1.96 3.16 4.71 5.41 9.78 14.81
wy02 16.26 24.61 1.49 2.13 3.42 4.53 4.58 10.08 1.80 1.69 3.01 4.59 1.96 1.59
wy08 14.65 14.79 1.39 1.49 2.33 3.35 3.57 1.87 3.08 3.05 2.15 2.66 2.15 2.37
wy99 15.58 16.90 0.91 0.68 2.31 2.64 5.09 5.96 3.49 3.56 2.55 3.55 1.22 0.51
Go to Table of Contents
Last Update: 1536 08JUL96 kjl