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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201812 | LHZ-10 | AR | 2976 | -168 | -172 | -175 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -176 | -174 | -170 | -163 | -157 | -153 | -153 | -151 | -143 | -131 | -122 | -122 | -126 |
| 201811 | LHZ-10 | AR | 2880 | -170 | -173 | -175 | -178 | -179 | -181 | -182 | -183 | -183 | -183 | -182 | -180 | -179 | -177 | -174 | -170 | -163 | -156 | -152 | -151 | -151 | -139 | -127 | -121 | -120 | -124 |
| 201810 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -178 | -179 | -181 | -182 | -183 | -184 | -183 | -182 | -181 | -179 | -178 | -175 | -171 | -164 | -158 | -155 | -153 | -153 | -145 | -133 | -125 | -123 | -124 |
| 201809 | LHZ-10 | AR | 2875 | -168 | -172 | -174 | -177 | -179 | -181 | -182 | -183 | -184 | -183 | -183 | -182 | -180 | -178 | -176 | -172 | -165 | -160 | -159 | -158 | -155 | -147 | -141 | -136 | -127 | -125 |
| 201808 | LHZ-10 | AR | 2976 | -168 | -171 | -174 | -177 | -179 | -180 | -182 | -183 | -183 | -183 | -183 | -182 | -181 | -179 | -177 | -174 | -168 | -163 | -163 | -163 | -159 | -151 | -145 | -140 | -134 | -130 |
| 201807 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -183 | -184 | -184 | -183 | -183 | -181 | -180 | -177 | -172 | -166 | -162 | -163 | -164 | -159 | -149 | -144 | -141 | -135 | -132 |
| 201806 | LHZ-10 | AR | 2876 | -169 | -172 | -175 | -177 | -180 | -181 | -183 | -184 | -184 | -184 | -184 | -183 | -182 | -180 | -177 | -173 | -167 | -162 | -161 | -162 | -159 | -151 | -144 | -139 | -132 | -130 |
| 201805 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -182 | -183 | -184 | -185 | -184 | -184 | -183 | -181 | -180 | -177 | -173 | -167 | -162 | -161 | -159 | -158 | -151 | -143 | -136 | -129 | -128 |
| 201804 | LHZ-10 | AR | 2880 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -184 | -182 | -181 | -179 | -177 | -174 | -168 | -162 | -160 | -160 | -158 | -147 | -140 | -136 | -129 | -128 |
| 201803 | LHZ-10 | AR | 2964 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -180 | -178 | -176 | -172 | -166 | -160 | -157 | -157 | -156 | -146 | -133 | -126 | -125 | -127 |
| 201802 | LHZ-10 | AR | 2688 | -169 | -173 | -175 | -178 | -180 | -181 | -181 | -182 | -182 | -181 | -180 | -179 | -177 | -176 | -173 | -169 | -163 | -156 | -152 | -153 | -151 | -138 | -125 | -120 | -123 | -124 |
| 201801 | LHZ-10 | AR | 2976 | -170 | -173 | -175 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -179 | -178 | -176 | -173 | -169 | -162 | -155 | -151 | -152 | -152 | -138 | -125 | -119 | -118 | -123 |
| 201712 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -177 | -174 | -171 | -165 | -158 | -154 | -152 | -152 | -142 | -130 | -126 | -121 | -124 |
| 201711 | LHZ-10 | AR | 2880 | -170 | -173 | -176 | -178 | -180 | -182 | -182 | -183 | -183 | -182 | -182 | -180 | -178 | -177 | -174 | -171 | -164 | -158 | -154 | -152 | -153 | -149 | -135 | -125 | -121 | -124 |
| 201710 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -179 | -177 | -175 | -171 | -165 | -159 | -156 | -154 | -152 | -146 | -137 | -129 | -122 | -121 |
| 201709 | LHZ-10 | AR | 2880 | -167 | -171 | -174 | -177 | -179 | -181 | -182 | -183 | -184 | -183 | -183 | -182 | -180 | -178 | -176 | -173 | -166 | -161 | -158 | -157 | -155 | -147 | -140 | -134 | -128 | -125 |
| 201708 | LHZ-10 | AR | 2975 | -169 | -172 | -175 | -177 | -180 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -177 | -174 | -168 | -163 | -163 | -164 | -160 | -151 | -144 | -142 | -136 | -132 |
| 201707 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -184 | -185 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -167 | -162 | -163 | -165 | -160 | -149 | -144 | -142 | -135 | -132 |
| 201706 | LHZ-10 | AR | 2880 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -184 | -185 | -185 | -184 | -183 | -182 | -181 | -178 | -173 | -166 | -162 | -163 | -163 | -158 | -149 | -143 | -139 | -133 | -131 |
| 201705 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -182 | -183 | -184 | -185 | -185 | -184 | -183 | -182 | -181 | -178 | -175 | -168 | -162 | -162 | -163 | -160 | -150 | -141 | -137 | -131 | -130 |
| 201704 | LHZ-10 | AR | 2880 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -181 | -179 | -177 | -172 | -165 | -161 | -161 | -160 | -156 | -146 | -139 | -133 | -127 | -127 |
| 201703 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -180 | -178 | -175 | -170 | -163 | -159 | -156 | -155 | -154 | -145 | -134 | -127 | -123 | -125 |
| 201702 | LHZ-10 | AR | 2688 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -183 | -182 | -181 | -180 | -179 | -177 | -174 | -170 | -163 | -158 | -154 | -154 | -153 | -142 | -130 | -124 | -123 | -125 |
| 201701 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -179 | -178 | -176 | -174 | -170 | -164 | -157 | -153 | -152 | -153 | -141 | -127 | -120 | -121 | -124 |
| 201612 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -180 | -179 | -177 | -175 | -173 | -169 | -164 | -157 | -152 | -151 | -150 | -141 | -128 | -118 | -118 | -122 |
| 201611 | LHZ-10 | AR | 2880 | -170 | -173 | -175 | -178 | -180 | -181 | -182 | -183 | -183 | -182 | -182 | -180 | -179 | -177 | -175 | -171 | -164 | -158 | -155 | -154 | -153 | -144 | -136 | -130 | -126 | -124 |
| 201610 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -183 | -182 | -181 | -180 | -178 | -176 | -172 | -166 | -160 | -157 | -156 | -154 | -145 | -137 | -130 | -125 | -126 |
| 201609 | LHZ-10 | AR | 2879 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -180 | -178 | -176 | -172 | -165 | -160 | -158 | -157 | -155 | -147 | -139 | -135 | -129 | -125 |
| 201608 | LHZ-10 | AR | 1638 | -169 | -172 | -175 | -178 | -180 | -182 | -183 | -184 | -184 | -184 | -183 | -183 | -181 | -179 | -176 | -173 | -168 | -163 | -162 | -162 | -159 | -150 | -144 | -141 | -134 | -130 |
| 201605 | LHZ-10 | AR | 474 | -169 | -173 | -175 | -177 | -179 | -181 | -182 | -183 | -184 | -184 | -183 | -183 | -181 | -180 | -178 | -173 | -166 | -162 | -161 | -158 | -156 | -148 | -140 | -137 | -130 | -128 |
| 201604 | LHZ-10 | AR | 2787 | -169 | -172 | -175 | -177 | -179 | -180 | -181 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -175 | -171 | -164 | -160 | -158 | -157 | -155 | -144 | -138 | -134 | -129 | -129 |
| 201603 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -183 | -182 | -181 | -180 | -178 | -176 | -171 | -163 | -158 | -156 | -155 | -152 | -141 | -133 | -126 | -124 | -125 |
| 201602 | LHZ-10 | AR | 2784 | -171 | -173 | -175 | -178 | -180 | -180 | -182 | -182 | -183 | -182 | -181 | -180 | -179 | -177 | -174 | -168 | -160 | -155 | -153 | -152 | -147 | -135 | -127 | -120 | -120 | -123 |
| 201601 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -180 | -181 | -181 | -182 | -181 | -181 | -179 | -178 | -176 | -174 | -169 | -161 | -155 | -152 | -152 | -150 | -139 | -129 | -122 | -122 | -124 |
| 201512 | LHZ-10 | AR | 2976 | -169 | -172 | -174 | -177 | -179 | -180 | -181 | -181 | -182 | -181 | -181 | -179 | -178 | -176 | -173 | -169 | -161 | -155 | -152 | -152 | -148 | -137 | -129 | -119 | -118 | -123 |
| 201511 | LHZ-10 | AR | 2880 | -169 | -172 | -175 | -177 | -179 | -180 | -181 | -182 | -183 | -182 | -181 | -180 | -179 | -177 | -175 | -171 | -164 | -158 | -153 | -152 | -152 | -143 | -131 | -122 | -119 | -123 |
| 201510 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -179 | -178 | -175 | -170 | -164 | -159 | -158 | -155 | -152 | -147 | -141 | -131 | -125 | -124 |
| 201509 | LHZ-10 | AR | 2880 | -169 | -172 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -181 | -179 | -176 | -172 | -165 | -161 | -160 | -160 | -155 | -148 | -142 | -138 | -131 | -126 |
| 201508 | LHZ-10 | AR | 2976 | -169 | -172 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -181 | -180 | -177 | -174 | -167 | -162 | -162 | -163 | -159 | -147 | -141 | -139 | -132 | -130 |
| 201507 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -178 | -179 | -181 | -182 | -184 | -184 | -184 | -184 | -183 | -182 | -180 | -178 | -173 | -166 | -162 | -163 | -165 | -160 | -150 | -146 | -143 | -135 | -132 |
| 201506 | LHZ-10 | AR | 2880 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -167 | -162 | -162 | -162 | -161 | -151 | -144 | -139 | -134 | -132 |
| 201505 | LHZ-10 | AR | 2975 | -167 | -170 | -173 | -175 | -178 | -180 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -179 | -177 | -172 | -165 | -161 | -161 | -160 | -158 | -148 | -142 | -135 | -130 | -130 |
| 201504 | LHZ-10 | AR | 2878 | -169 | -173 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -183 | -183 | -181 | -180 | -178 | -176 | -173 | -167 | -161 | -159 | -157 | -156 | -148 | -139 | -133 | -129 | -129 |
| 201503 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -181 | -181 | -182 | -183 | -182 | -181 | -180 | -179 | -177 | -174 | -170 | -164 | -159 | -155 | -154 | -153 | -145 | -132 | -124 | -122 | -124 |
| 201502 | LHZ-10 | AR | 2688 | -171 | -174 | -176 | -178 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -179 | -177 | -176 | -173 | -169 | -163 | -156 | -152 | -152 | -153 | -142 | -128 | -120 | -121 | -124 |
| 201501 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -178 | -176 | -173 | -168 | -161 | -155 | -151 | -151 | -150 | -134 | -122 | -119 | -120 | -123 |
| 201412 | LHZ-10 | AR | 2970 | -170 | -173 | -175 | -178 | -180 | -181 | -181 | -182 | -182 | -181 | -180 | -179 | -177 | -176 | -173 | -170 | -163 | -158 | -154 | -153 | -153 | -146 | -131 | -120 | -119 | -123 |
| 201411 | LHZ-10 | AR | 2880 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -176 | -174 | -171 | -165 | -158 | -155 | -154 | -153 | -143 | -131 | -123 | -120 | -123 |
| 201410 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -179 | -177 | -175 | -171 | -165 | -159 | -155 | -153 | -153 | -144 | -134 | -125 | -123 | -124 |
| 201409 | LHZ-10 | AR | 2868 | -170 | -173 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -183 | -183 | -182 | -180 | -178 | -175 | -171 | -165 | -160 | -160 | -159 | -154 | -147 | -141 | -137 | -129 | -124 |
| 201408 | LHZ-10 | AR | 2975 | -170 | -173 | -175 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -181 | -179 | -177 | -172 | -165 | -161 | -162 | -163 | -157 | -148 | -143 | -140 | -134 | -131 |
| 201407 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -177 | -174 | -168 | -163 | -163 | -165 | -161 | -151 | -145 | -141 | -136 | -133 |
| 201406 | LHZ-10 | AR | 2880 | -170 | -173 | -175 | -178 | -180 | -181 | -182 | -184 | -184 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -167 | -163 | -163 | -165 | -161 | -151 | -145 | -142 | -135 | -132 |
| 201405 | LHZ-10 | AR | 2976 | -171 | -174 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -183 | -181 | -180 | -178 | -174 | -168 | -163 | -163 | -164 | -160 | -150 | -143 | -140 | -134 | -132 |
| 201404 | LHZ-10 | AR | 2880 | -170 | -173 | -176 | -178 | -179 | -181 | -182 | -183 | -183 | -183 | -182 | -182 | -180 | -179 | -176 | -173 | -166 | -161 | -160 | -159 | -157 | -147 | -139 | -133 | -128 | -128 |
| 201403 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -179 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -179 | -177 | -174 | -169 | -163 | -157 | -154 | -154 | -152 | -141 | -129 | -123 | -123 | -124 |
| 201402 | LHZ-10 | AR | 2688 | -170 | -173 | -176 | -178 | -180 | -181 | -182 | -182 | -183 | -182 | -181 | -180 | -179 | -177 | -175 | -171 | -164 | -157 | -153 | -154 | -152 | -137 | -124 | -117 | -118 | -123 |
| 201401 | LHZ-10 | AR | 2976 | -171 | -173 | -176 | -177 | -179 | -180 | -181 | -181 | -182 | -181 | -180 | -179 | -178 | -176 | -174 | -170 | -163 | -156 | -152 | -152 | -150 | -136 | -121 | -114 | -117 | -123 |
| 201312 | LHZ-10 | AR | 2976 | -172 | -174 | -176 | -179 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -177 | -175 | -173 | -170 | -165 | -158 | -152 | -152 | -153 | -145 | -129 | -121 | -120 | -124 |
| 201311 | LHZ-10 | AR | 2880 | -172 | -174 | -177 | -179 | -180 | -182 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -176 | -174 | -170 | -165 | -158 | -153 | -152 | -152 | -148 | -131 | -121 | -120 | -123 |
| 201310 | LHZ-10 | AR | 2976 | -171 | -174 | -176 | -178 | -180 | -182 | -182 | -183 | -184 | -184 | -183 | -182 | -180 | -178 | -176 | -172 | -166 | -161 | -159 | -156 | -154 | -147 | -140 | -134 | -125 | -126 |
| 201309 | LHZ-10 | AR | 2880 | -171 | -174 | -176 | -178 | -180 | -181 | -182 | -183 | -184 | -184 | -183 | -182 | -180 | -178 | -176 | -173 | -167 | -161 | -159 | -157 | -155 | -148 | -140 | -135 | -127 | -125 |
| 201308 | LHZ-10 | AR | 2976 | -170 | -173 | -176 | -178 | -180 | -181 | -183 | -184 | -185 | -184 | -184 | -183 | -181 | -180 | -177 | -173 | -168 | -163 | -163 | -163 | -158 | -152 | -144 | -139 | -133 | -129 |
| 201307 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -167 | -162 | -163 | -165 | -160 | -149 | -145 | -141 | -136 | -133 |
| 201306 | LHZ-10 | AR | 2880 | -169 | -172 | -175 | -177 | -179 | -181 | -182 | -183 | -184 | -184 | -184 | -183 | -182 | -180 | -178 | -174 | -167 | -162 | -162 | -163 | -160 | -151 | -144 | -141 | -134 | -132 |
| 201305 | LHZ-10 | AR | 2976 | -169 | -172 | -175 | -177 | -179 | -180 | -182 | -183 | -184 | -184 | -183 | -182 | -181 | -180 | -178 | -174 | -167 | -161 | -162 | -161 | -159 | -149 | -143 | -137 | -130 | -129 |
| 201304 | LHZ-10 | AR | 2880 | -171 | -173 | -176 | -178 | -180 | -181 | -182 | -183 | -183 | -183 | -183 | -182 | -180 | -178 | -176 | -171 | -164 | -160 | -159 | -158 | -155 | -147 | -139 | -131 | -127 | -128 |
| 201303 | LHZ-10 | AR | 2976 | -170 | -173 | -175 | -178 | -179 | -181 | -182 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -175 | -171 | -163 | -158 | -158 | -158 | -153 | -144 | -139 | -132 | -127 | -127 |
| 201302 | LHZ-10 | AR | 2688 | -171 | -173 | -176 | -178 | -179 | -181 | -181 | -182 | -183 | -182 | -181 | -180 | -179 | -177 | -174 | -169 | -162 | -156 | -154 | -154 | -151 | -140 | -131 | -124 | -122 | -125 |
| 201301 | LHZ-10 | AR | 2689 | -169 | -172 | -174 | -176 | -178 | -180 | -180 | -181 | -181 | -181 | -180 | -179 | -178 | -176 | -173 | -170 | -162 | -156 | -153 | -153 | -154 | -142 | -129 | -124 | -123 | -125 |