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. | 518s | 439s | 373s | 316s | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202311 | LH1-00 | AR | 33 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 202310 | LH1-00 | AR | 276 | -128 | -129 | -130 | -132 | -134 | -135 | -137 | -138 | -140 | -142 | -144 | -145 | -147 | -149 | -151 | -153 | -156 | -158 | -160 | -161 | -159 | -155 | -153 | -154 | -153 |
| 202309 | LH1-00 | AR | 720 | -128 | -129 | -130 | -132 | -134 | -136 | -138 | -139 | -141 | -143 | -145 | -146 | -148 | -150 | -152 | -154 | -156 | -158 | -160 | -161 | -160 | -157 | -156 | -156 | -155 |
| 202308 | LH1-00 | AR | 403 | -129 | -132 | -132 | -134 | -137 | -138 | -141 | -142 | -144 | -146 | -147 | -149 | -151 | -153 | -154 | -157 | -159 | -161 | -163 | -163 | -161 | -158 | -158 | -159 | -155 |
| 202307 | LH1-00 | AR | 744 | -128 | -129 | -130 | -132 | -133 | -135 | -136 | -139 | -139 | -141 | -142 | -144 | -146 | -148 | -150 | -152 | -155 | -156 | -158 | -160 | -160 | -158 | -159 | -158 | -155 |
| 202306 | LH1-00 | AR | 670 | -124 | -124 | -124 | -125 | -126 | -126 | -126 | -127 | -127 | -128 | -130 | -132 | -134 | -136 | -137 | -139 | -141 | -144 | -146 | -146 | -145 | -142 | -141 | -142 | -141 |
| 201909 | LH1-00 | AR | 4 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201908 | LH1-00 | AR | 61 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201906 | LH1-00 | AR | 145 | -184 | -185 | -184 | -185 | -185 | -185 | -186 | -185 | -186 | -186 | -185 | -185 | -184 | -183 | -183 | -181 | -181 | -179 | -179 | -177 | -175 | -174 | -173 | -172 | -171 |
| 201905 | LH1-00 | AR | 487 | -184 | -184 | -185 | -185 | -185 | -185 | -185 | -186 | -185 | -185 | -185 | -184 | -184 | -183 | -182 | -182 | -180 | -179 | -178 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201904 | LH1-00 | AR | 289 | -185 | -186 | -186 | -186 | -187 | -187 | -186 | -186 | -186 | -185 | -186 | -185 | -184 | -183 | -183 | -182 | -181 | -180 | -179 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201812 | LH1-00 | AR | 451 | -183 | -184 | -185 | -185 | -185 | -186 | -186 | -185 | -185 | -185 | -184 | -184 | -183 | -183 | -182 | -181 | -180 | -179 | -178 | -177 | -176 | -174 | -173 | -172 | -170 |
| 201811 | LH1-00 | AR | 697 | -184 | -185 | -186 | -186 | -186 | -186 | -186 | -186 | -186 | -185 | -185 | -185 | -184 | -183 | -183 | -182 | -180 | -179 | -178 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201810 | LH1-00 | AR | 683 | -183 | -183 | -183 | -183 | -184 | -184 | -184 | -184 | -184 | -185 | -184 | -183 | -183 | -182 | -181 | -181 | -180 | -179 | -178 | -176 | -175 | -174 | -173 | -172 | -170 |
| 201809 | LH1-00 | AR | 660 | -185 | -185 | -185 | -186 | -186 | -186 | -186 | -186 | -186 | -186 | -185 | -185 | -184 | -183 | -183 | -182 | -181 | -179 | -178 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201808 | LH1-00 | AR | 741 | -184 | -185 | -185 | -186 | -186 | -187 | -186 | -186 | -186 | -186 | -185 | -185 | -184 | -183 | -183 | -182 | -181 | -180 | -178 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201807 | LH1-00 | AR | 592 | -184 | -184 | -185 | -185 | -186 | -186 | -186 | -186 | -185 | -185 | -185 | -185 | -184 | -183 | -182 | -181 | -181 | -180 | -178 | -177 | -176 | -174 | -173 | -172 | -171 |
| 201806 | LH1-00 | AR | 720 | -171 | -173 | -174 | -176 | -178 | -179 | -180 | -181 | -180 | -180 | -180 | -181 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -173 | -166 | -160 | -157 | -158 | -157 |
| 201805 | LH1-00 | AR | 744 | -171 | -173 | -174 | -176 | -178 | -180 | -180 | -180 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -182 | -182 | -180 | -179 | -174 | -168 | -161 | -159 | -158 | -157 |
| 201804 | LH1-00 | AR | 720 | -171 | -173 | -174 | -176 | -178 | -180 | -180 | -180 | -179 | -179 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -175 | -169 | -162 | -158 | -157 | -154 |
| 201803 | LH1-00 | AR | 744 | -171 | -173 | -174 | -176 | -178 | -179 | -180 | -180 | -180 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -178 | -173 | -165 | -157 | -154 | -154 | -152 |
| 201802 | LH1-00 | AR | 64 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |