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 | LH2 | AR | 286 | -160 | -163 | -164 | -166 | -168 | -170 | -172 | -173 | -175 | -176 | -177 | -177 | -176 | -175 | -174 | -170 | -162 | -155 | -148 | -147 | -148 | -136 | -117 | -109 | -110 | -118 |
| 201212 | LH2 | AR | 2976 | -166 | -167 | -170 | -171 | -173 | -174 | -175 | -176 | -177 | -177 | -178 | -178 | -177 | -176 | -174 | -170 | -163 | -157 | -152 | -150 | -150 | -142 | -128 | -117 | -115 | -120 |
| 201211 | LH2 | AR | 2880 | -161 | -164 | -165 | -167 | -169 | -170 | -172 | -173 | -174 | -175 | -175 | -175 | -174 | -174 | -172 | -168 | -163 | -155 | -150 | -147 | -147 | -143 | -128 | -116 | -114 | -118 |
| 201210 | LH2 | AR | 2976 | -154 | -157 | -159 | -161 | -163 | -165 | -167 | -169 | -170 | -171 | -172 | -173 | -173 | -173 | -171 | -169 | -164 | -158 | -153 | -150 | -150 | -148 | -141 | -127 | -121 | -120 |
| 201209 | LH2 | AR | 2880 | -152 | -154 | -156 | -158 | -160 | -162 | -164 | -166 | -168 | -170 | -171 | -172 | -173 | -172 | -172 | -169 | -164 | -159 | -155 | -152 | -151 | -149 | -141 | -130 | -122 | -120 |
| 201208 | LH2 | AR | 2976 | -149 | -151 | -153 | -155 | -157 | -159 | -161 | -163 | -165 | -167 | -168 | -170 | -171 | -172 | -172 | -170 | -165 | -161 | -161 | -161 | -156 | -153 | -149 | -146 | -139 | -132 |
| 201207 | LH2 | AR | 789 | -144 | -146 | -148 | -151 | -152 | -154 | -156 | -158 | -160 | -161 | -164 | -165 | -167 | -168 | -169 | -169 | -166 | -162 | -161 | -158 | -156 | -154 | -151 | -143 | -135 | -131 |
| 201205 | LH2 | AR | 388 | -158 | -162 | -165 | -168 | -171 | -173 | -175 | -177 | -178 | -180 | -180 | -181 | -181 | -181 | -179 | -175 | -168 | -164 | -163 | -163 | -159 | -156 | -150 | -141 | -132 | -132 |
| 201204 | LH2 | AR | 2880 | -163 | -165 | -167 | -169 | -170 | -172 | -173 | -175 | -176 | -177 | -178 | -179 | -179 | -179 | -178 | -175 | -169 | -163 | -161 | -159 | -157 | -153 | -147 | -136 | -127 | -126 |
| 201203 | LH2 | AR | 2976 | -158 | -161 | -164 | -166 | -168 | -169 | -171 | -173 | -174 | -176 | -177 | -177 | -177 | -177 | -176 | -173 | -167 | -161 | -156 | -152 | -153 | -147 | -138 | -126 | -122 | -124 |
| 201202 | LH2 | AR | 2784 | -157 | -159 | -161 | -163 | -165 | -166 | -168 | -170 | -171 | -172 | -173 | -174 | -174 | -174 | -173 | -170 | -165 | -159 | -153 | -150 | -151 | -146 | -133 | -120 | -118 | -121 |
| 201201 | LH2 | AR | 2976 | -159 | -161 | -163 | -165 | -167 | -168 | -169 | -171 | -172 | -173 | -174 | -175 | -175 | -175 | -173 | -169 | -163 | -158 | -153 | -150 | -150 | -143 | -126 | -116 | -113 | -118 |
| 201112 | LH2 | AR | 2976 | -152 | -154 | -155 | -157 | -159 | -160 | -161 | -162 | -163 | -165 | -166 | -167 | -168 | -169 | -168 | -166 | -162 | -156 | -149 | -148 | -149 | -139 | -121 | -116 | -116 | -119 |
| 201111 | LH2 | AR | 2880 | -151 | -154 | -156 | -158 | -161 | -162 | -164 | -165 | -167 | -169 | -170 | -170 | -171 | -171 | -170 | -168 | -162 | -155 | -150 | -149 | -148 | -139 | -129 | -119 | -116 | -118 |
| 201110 | LH2 | AR | 2976 | -150 | -152 | -154 | -157 | -158 | -160 | -162 | -164 | -165 | -167 | -168 | -169 | -170 | -170 | -169 | -167 | -162 | -156 | -151 | -149 | -148 | -145 | -131 | -119 | -116 | -119 |
| 201109 | LH2 | AR | 2880 | -142 | -144 | -146 | -148 | -151 | -152 | -155 | -157 | -159 | -161 | -162 | -164 | -165 | -167 | -168 | -167 | -163 | -159 | -154 | -152 | -150 | -148 | -137 | -130 | -123 | -121 |
| 201108 | LH2 | AR | 2976 | -136 | -138 | -140 | -142 | -144 | -146 | -148 | -150 | -152 | -154 | -155 | -158 | -159 | -161 | -163 | -163 | -162 | -160 | -159 | -159 | -155 | -152 | -148 | -143 | -134 | -128 |