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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202601 | LH1-20 | AR | 618 | -161 | -163 | -164 | -167 | -169 | -171 | -173 | -174 | -175 | -177 | -178 | -179 | -181 | -181 | -180 | -178 | -176 | -173 | -170 | -166 | -160 | -153 | -149 | -148 | -148 |
| 202512 | LH1-20 | AR | 725 | -161 | -163 | -164 | -166 | -169 | -171 | -173 | -175 | -176 | -177 | -178 | -179 | -180 | -181 | -180 | -179 | -178 | -176 | -173 | -168 | -161 | -156 | -155 | -158 | -155 |
| 202511 | LH1-20 | AR | 716 | -160 | -161 | -164 | -165 | -168 | -170 | -172 | -174 | -176 | -176 | -177 | -178 | -179 | -181 | -180 | -179 | -178 | -177 | -175 | -171 | -164 | -157 | -156 | -159 | -158 |
| 202510 | LH1-20 | AR | 742 | -158 | -160 | -161 | -163 | -165 | -167 | -169 | -172 | -173 | -175 | -176 | -178 | -179 | -180 | -180 | -179 | -178 | -177 | -175 | -171 | -164 | -158 | -156 | -159 | -156 |
| 202509 | LH1-20 | AR | 720 | -159 | -161 | -162 | -165 | -167 | -169 | -172 | -174 | -175 | -176 | -177 | -178 | -180 | -180 | -180 | -179 | -178 | -177 | -175 | -170 | -162 | -155 | -153 | -157 | -153 |
| 202508 | LH1-20 | AR | 742 | -159 | -161 | -163 | -165 | -168 | -170 | -172 | -174 | -175 | -176 | -177 | -178 | -179 | -180 | -180 | -178 | -177 | -176 | -174 | -168 | -162 | -154 | -152 | -157 | -153 |
| 202507 | LH1-20 | AR | 743 | -159 | -160 | -162 | -164 | -166 | -169 | -171 | -173 | -175 | -176 | -177 | -178 | -179 | -180 | -179 | -178 | -176 | -175 | -173 | -167 | -160 | -153 | -152 | -155 | -149 |
| 202506 | LH1-20 | AR | 718 | -159 | -161 | -163 | -165 | -168 | -170 | -172 | -174 | -175 | -176 | -177 | -178 | -179 | -180 | -180 | -178 | -177 | -175 | -173 | -168 | -161 | -154 | -153 | -156 | -149 |
| 202505 | LH1-20 | AR | 744 | -160 | -161 | -164 | -166 | -168 | -170 | -172 | -174 | -175 | -176 | -177 | -178 | -179 | -180 | -180 | -178 | -176 | -174 | -171 | -165 | -158 | -152 | -151 | -154 | -146 |
| 202504 | LH1-20 | AR | 718 | -159 | -160 | -163 | -165 | -167 | -170 | -172 | -174 | -175 | -176 | -177 | -178 | -179 | -180 | -180 | -178 | -175 | -172 | -169 | -164 | -156 | -149 | -146 | -148 | -144 |
| 202503 | LH1-20 | AR | 742 | -161 | -162 | -164 | -166 | -168 | -170 | -172 | -174 | -176 | -177 | -178 | -179 | -180 | -180 | -180 | -177 | -174 | -170 | -167 | -161 | -154 | -146 | -142 | -141 | -142 |
| 202502 | LH1-20 | AR | 672 | -161 | -163 | -164 | -166 | -169 | -171 | -173 | -174 | -176 | -177 | -178 | -179 | -180 | -181 | -180 | -177 | -174 | -170 | -167 | -162 | -156 | -149 | -145 | -144 | -144 |
| 202501 | LH1-20 | AR | 744 | -162 | -164 | -165 | -168 | -170 | -172 | -174 | -176 | -177 | -178 | -178 | -180 | -180 | -181 | -180 | -178 | -175 | -172 | -169 | -164 | -156 | -151 | -149 | -149 | -147 |