Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Month | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s | 8s | 7s | 6s | 5s | 4s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201301 | LHZ | AR | 943 | -180 | -180 | -181 | -181 | -182 | -182 | -183 | -184 | -184 | -184 | -184 | -183 | -182 | -180 | -176 | -171 | -162 | -154 | -148 | -148 | -150 | -135 | -123 | -118 | -122 | -124 |
| 201212 | LHZ | AR | 2976 | -174 | -175 | -177 | -178 | -179 | -179 | -180 | -180 | -181 | -181 | -181 | -180 | -179 | -178 | -176 | -173 | -164 | -156 | -152 | -151 | -151 | -142 | -131 | -124 | -122 | -125 |
| 201211 | LHZ | AR | 2880 | -177 | -177 | -178 | -179 | -180 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -179 | -176 | -172 | -164 | -155 | -150 | -148 | -150 | -143 | -130 | -120 | -119 | -123 |
| 201210 | LHZ | AR | 2976 | -178 | -178 | -180 | -181 | -181 | -182 | -182 | -183 | -184 | -184 | -184 | -183 | -181 | -180 | -177 | -173 | -165 | -159 | -155 | -152 | -152 | -148 | -141 | -131 | -124 | -125 |
| 201209 | LHZ | AR | 2879 | -179 | -179 | -181 | -181 | -182 | -183 | -183 | -184 | -185 | -185 | -184 | -184 | -182 | -180 | -178 | -173 | -165 | -160 | -157 | -153 | -153 | -149 | -142 | -133 | -126 | -125 |
| 201208 | LHZ | AR | 2976 | -177 | -179 | -178 | -180 | -182 | -182 | -183 | -184 | -184 | -185 | -185 | -184 | -183 | -181 | -178 | -174 | -166 | -162 | -162 | -163 | -158 | -151 | -146 | -142 | -137 | -134 |
| 201207 | LHZ | AR | 2943 | -175 | -175 | -177 | -178 | -179 | -180 | -181 | -182 | -182 | -183 | -183 | -182 | -181 | -180 | -177 | -174 | -167 | -162 | -162 | -163 | -159 | -153 | -147 | -142 | -138 | -135 |
| 201206 | LHZ | AR | 1677 | -177 | -178 | -180 | -180 | -181 | -181 | -182 | -183 | -184 | -184 | -184 | -184 | -183 | -182 | -179 | -175 | -168 | -163 | -163 | -165 | -162 | -153 | -148 | -145 | -140 | -137 |
| 201203 | LHZ | AR | 1152 | -178 | -179 | -180 | -181 | -181 | -181 | -182 | -183 | -183 | -183 | -183 | -182 | -181 | -179 | -176 | -172 | -164 | -155 | -151 | -149 | -148 | -132 | -122 | -120 | -121 | -124 |
| 201202 | LHZ | AR | 2366 | -173 | -174 | -176 | -177 | -178 | -179 | -179 | -180 | -180 | -181 | -181 | -180 | -179 | -178 | -176 | -172 | -164 | -156 | -152 | -149 | -151 | -143 | -132 | -125 | -123 | -125 |
| 201201 | LHZ | AR | 2976 | -176 | -176 | -178 | -179 | -179 | -180 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -179 | -176 | -171 | -163 | -156 | -152 | -150 | -150 | -143 | -128 | -121 | -120 | -123 |
| 201112 | LHZ | AR | 2921 | -176 | -176 | -177 | -178 | -179 | -179 | -180 | -180 | -181 | -181 | -181 | -180 | -179 | -178 | -175 | -171 | -164 | -155 | -149 | -149 | -150 | -140 | -125 | -122 | -122 | -124 |
| 201111 | LHZ | AR | 2880 | -173 | -172 | -175 | -176 | -176 | -177 | -178 | -179 | -180 | -181 | -181 | -180 | -180 | -178 | -176 | -172 | -163 | -155 | -151 | -150 | -150 | -139 | -130 | -124 | -123 | -125 |
| 201110 | LHZ | AR | 2956 | -174 | -173 | -176 | -177 | -178 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -176 | -172 | -164 | -158 | -153 | -150 | -150 | -147 | -133 | -124 | -121 | -121 |
| 201109 | LHZ | AR | 2872 | -178 | -179 | -180 | -180 | -181 | -181 | -182 | -183 | -183 | -184 | -183 | -183 | -182 | -180 | -177 | -173 | -166 | -160 | -155 | -153 | -153 | -149 | -139 | -133 | -128 | -127 |
| 201108 | LHZ | AR | 2623 | -177 | -178 | -179 | -180 | -180 | -181 | -182 | -183 | -183 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -168 | -162 | -162 | -163 | -159 | -151 | -146 | -142 | -137 | -133 |
| 201107 | LHZ | AR | 2431 | -176 | -178 | -179 | -180 | -180 | -181 | -182 | -182 | -183 | -183 | -183 | -183 | -182 | -181 | -178 | -175 | -168 | -162 | -162 | -161 | -159 | -154 | -148 | -141 | -137 | -135 |
| 201106 | LHZ | AR | 2774 | -176 | -177 | -178 | -179 | -180 | -180 | -181 | -182 | -183 | -183 | -183 | -183 | -182 | -181 | -178 | -175 | -167 | -162 | -162 | -162 | -158 | -151 | -145 | -141 | -136 | -134 |
| 201105 | LHZ | AR | 2976 | -179 | -180 | -181 | -181 | -181 | -182 | -182 | -183 | -184 | -185 | -185 | -185 | -184 | -182 | -179 | -174 | -167 | -162 | -162 | -161 | -159 | -152 | -145 | -141 | -135 | -133 |
| 201104 | LHZ | AR | 2879 | -178 | -179 | -180 | -180 | -181 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -177 | -173 | -165 | -159 | -156 | -153 | -153 | -147 | -137 | -128 | -126 | -127 |
| 201103 | LHZ | AR | 2975 | -177 | -178 | -179 | -180 | -180 | -181 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -178 | -175 | -170 | -163 | -156 | -152 | -150 | -151 | -141 | -134 | -128 | -126 | -129 |
| 201102 | LHZ | AR | 2688 | -178 | -178 | -179 | -180 | -180 | -180 | -180 | -180 | -181 | -181 | -181 | -180 | -180 | -178 | -174 | -169 | -160 | -152 | -148 | -149 | -148 | -133 | -122 | -116 | -119 | -124 |
| 201101 | LHZ | AR | 2976 | -175 | -177 | -178 | -178 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -181 | -179 | -178 | -175 | -169 | -161 | -153 | -149 | -149 | -149 | -140 | -129 | -123 | -124 | -127 |
| 201012 | LHZ | AR | 2976 | -177 | -178 | -179 | -179 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -176 | -173 | -166 | -158 | -152 | -150 | -152 | -150 | -139 | -129 | -127 | -129 |
| 201011 | LHZ | AR | 2880 | -175 | -177 | -178 | -179 | -179 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -179 | -178 | -176 | -172 | -164 | -157 | -151 | -149 | -151 | -147 | -136 | -124 | -122 | -125 |
| 201010 | LHZ | AR | 2976 | -175 | -176 | -178 | -178 | -179 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -176 | -173 | -166 | -158 | -154 | -151 | -152 | -147 | -136 | -125 | -120 | -122 |
| 201009 | LHZ | AR | 2880 | -177 | -178 | -179 | -180 | -180 | -181 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -180 | -177 | -172 | -165 | -159 | -157 | -154 | -152 | -148 | -141 | -134 | -125 | -125 |
| 201008 | LHZ | AR | 1798 | -176 | -178 | -179 | -180 | -180 | -181 | -181 | -182 | -183 | -184 | -183 | -183 | -182 | -181 | -178 | -173 | -166 | -161 | -161 | -161 | -157 | -151 | -145 | -141 | -136 | -132 |