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Lake Dora algae history from satellite

We read Lake Dora from 422 cloud-free satellite scenes between Apr 14, 2016 – Oct 1, 2026. Here is what the surface water showed.

Clear scenes
422
Typical (median), index
123
Highest reading
340 · Aug 17, 2017
Latest scene
98 · Oct 1, 2026

Algae signal (red-edge index) over time

01002003004002017201820192020202120222023202420252026Apr 14, 2016: 120 index (high)May 14, 2016: 93 index (low)Jun 23, 2016: 81 index (high)Jul 13, 2016: 90 index (high)Aug 2, 2016: 154 index (low)Aug 22, 2016: 125 index (high)Sep 11, 2016: 124 index (high)Oct 1, 2016: 132 index (high)Oct 21, 2016: 107 index (high)Nov 10, 2016: 118 index (high)Nov 20, 2016: 107 index (high)Nov 30, 2016: 155 index (high)Feb 8, 2017: 130 index (high)Mar 10, 2017: 123 index (high)Mar 30, 2017: 161 index (high)Apr 19, 2017: 262 index (high)May 9, 2017: 326 index (high)May 29, 2017: 304 index (high)Jun 18, 2017: 333 index (high)Aug 12, 2017: 332 index (high)Aug 17, 2017: 340 index (high)Sep 21, 2017: 235 index (high)Sep 26, 2017: 260 index (high)Oct 31, 2017: 172 index (high)Nov 20, 2017: 140 index (high)Nov 25, 2017: 138 index (high)Nov 30, 2017: 141 index (high)Dec 10, 2017: 138 index (high)Dec 20, 2017: 147 index (high)Dec 30, 2017: 88 index (high)Jan 4, 2018: 165 index (high)Jan 9, 2018: 140 index (high)Jan 24, 2018: 131 index (high)Feb 18, 2018: 151 index (high)Feb 28, 2018: 131 index (high)Mar 5, 2018: 175 index (high)Mar 15, 2018: 167 index (high)Mar 25, 2018: 176 index (high)Apr 4, 2018: 181 index (high)Apr 14, 2018: 180 index (high)Apr 19, 2018: 175 index (high)Apr 24, 2018: 183 index (high)Apr 29, 2018: 161 index (high)May 4, 2018: 161 index (high)May 9, 2018: 137 index (high)May 24, 2018: 130 index (high)May 29, 2018: 155 index (low)Jun 8, 2018: 125 index (low)Jun 13, 2018: 120 index (high)Jun 23, 2018: 143 index (low)Jun 28, 2018: 117 index (low)Jul 3, 2018: 94 index (low)Jul 13, 2018: 84 index (low)Aug 2, 2018: 86 index (low)Aug 7, 2018: 68 index (low)Aug 12, 2018: 66 index (low)Aug 17, 2018: 58 index (low)Aug 27, 2018: 58 index (low)Sep 1, 2018: 63 index (low)Sep 6, 2018: 61 index (low)Sep 11, 2018: 41 index (low)Sep 16, 2018: 44 index (low)Sep 21, 2018: 21 index (low)Sep 26, 2018: 47 index (low)Oct 6, 2018: 54 index (low)Oct 16, 2018: 52 index (high)Oct 21, 2018: 56 index (high)Oct 31, 2018: 52 index (high)Nov 15, 2018: 67 index (low)Dec 5, 2018: 49 index (low)Dec 25, 2018: 90 index (high)Dec 30, 2018: 69 index (low)Jan 4, 2019: 50 index (low)Jan 29, 2019: 49 index (low)Feb 8, 2019: 56 index (high)Feb 23, 2019: 51 index (high)Feb 28, 2019: 56 index (low)Mar 10, 2019: 52 index (low)Mar 15, 2019: 34 index (low)Mar 20, 2019: 41 index (low)Apr 4, 2019: 45 index (low)Apr 9, 2019: 54 index (low)Apr 24, 2019: 39 index (low)Apr 29, 2019: 67 index (low)May 19, 2019: 49 index (low)May 24, 2019: 61 index (low)May 29, 2019: 69 index (low)Jun 23, 2019: 102 index (low)Jun 28, 2019: 90 index (low)Jul 3, 2019: 112 index (low)Jul 18, 2019: 136 index (high)Jul 23, 2019: 118 index (high)Jul 28, 2019: 136 index (high)Aug 12, 2019: 132 index (high)Aug 22, 2019: 152 index (high)Aug 27, 2019: 154 index (high)Sep 11, 2019: 98 index (low)Sep 16, 2019: 174 index (high)Sep 21, 2019: 126 index (high)Oct 11, 2019: 132 index (high)Oct 16, 2019: 132 index (high)Oct 26, 2019: 121 index (high)Nov 10, 2019: 96 index (high)Nov 20, 2019: 89 index (high)Nov 25, 2019: 68 index (high)Nov 30, 2019: 104 index (high)Dec 5, 2019: 103 index (high)Dec 10, 2019: 112 index (high)Dec 15, 2019: 104 index (high)Dec 25, 2019: 114 index (high)Jan 9, 2020: 90 index (high)Feb 3, 2020: 48 index (low)Feb 8, 2020: 59 index (high)Feb 18, 2020: 73 index (high)Feb 23, 2020: 48 index (low)Feb 28, 2020: 42 index (low)Mar 4, 2020: 47 index (low)Mar 14, 2020: 52 index (high)Mar 19, 2020: 44 index (low)Mar 24, 2020: 34 index (low)Mar 29, 2020: 40 index (low)Apr 3, 2020: 36 index (low)Apr 8, 2020: 51 index (low)Apr 13, 2020: 66 index (low)Apr 23, 2020: 77 index (low)Apr 28, 2020: 55 index (low)May 3, 2020: 45 index (low)May 8, 2020: 64 index (low)May 13, 2020: 91 index (low)May 28, 2020: 83 index (low)Jun 17, 2020: 59 index (low)Jun 22, 2020: 54 index (high)Jul 2, 2020: 104 index (low)Jul 7, 2020: 110 index (low)Jul 12, 2020: 97 index (low)Jul 17, 2020: 126 index (low)Jul 27, 2020: 118 index (high)Aug 1, 2020: 135 index (high)Aug 11, 2020: 141 index (high)Aug 16, 2020: 134 index (high)Aug 26, 2020: 106 index (low)Sep 5, 2020: 116 index (high)Sep 10, 2020: 135 index (high)Sep 25, 2020: 124 index (high)Oct 10, 2020: 89 index (low)Oct 15, 2020: 72 index (high)Oct 25, 2020: 129 index (high)Oct 30, 2020: 119 index (high)Nov 4, 2020: 90 index (high)Nov 14, 2020: 112 index (high)Nov 19, 2020: 110 index (high)Nov 24, 2020: 100 index (high)Nov 29, 2020: 82 index (high)Dec 9, 2020: 92 index (high)Dec 19, 2020: 87 index (high)Dec 29, 2020: 99 index (high)Jan 8, 2021: 117 index (high)Jan 18, 2021: 106 index (high)Jan 28, 2021: 104 index (high)Feb 2, 2021: 107 index (high)Feb 7, 2021: 117 index (high)Feb 12, 2021: 98 index (high)Feb 22, 2021: 112 index (high)Mar 4, 2021: 103 index (high)Mar 9, 2021: 107 index (high)Mar 14, 2021: 108 index (high)Mar 19, 2021: 114 index (high)Mar 24, 2021: 86 index (high)Apr 8, 2021: 161 index (high)Apr 13, 2021: 169 index (high)Apr 23, 2021: 214 index (high)Apr 28, 2021: 196 index (high)May 3, 2021: 204 index (high)May 8, 2021: 196 index (high)May 18, 2021: 215 index (low)May 28, 2021: 154 index (high)Jun 12, 2021: 185 index (low)Jun 27, 2021: 223 index (low)Jul 12, 2021: 189 index (high)Jul 17, 2021: 185 index (high)Jul 22, 2021: 180 index (high)Jul 27, 2021: 199 index (high)Aug 6, 2021: 191 index (high)Aug 11, 2021: 206 index (high)Aug 21, 2021: 200 index (high)Aug 31, 2021: 211 index (high)Sep 15, 2021: 111 index (high)Sep 25, 2021: 252 index (high)Oct 10, 2021: 247 index (high)Oct 15, 2021: 233 index (high)Oct 20, 2021: 217 index (high)Oct 30, 2021: 196 index (high)Nov 9, 2021: 190 index (high)Nov 14, 2021: 188 index (high)Nov 19, 2021: 179 index (high)Nov 24, 2021: 188 index (high)Nov 29, 2021: 187 index (high)Dec 4, 2021: 196 index (high)Dec 24, 2021: 162 index (high)Dec 29, 2021: 149 index (high)Jan 3, 2022: 145 index (high)Jan 8, 2022: 150 index (high)Jan 13, 2022: 147 index (high)Jan 18, 2022: 130 index (high)Feb 2, 2022: 83 index (high)Feb 12, 2022: 77 index (high)Feb 22, 2022: 89 index (high)Feb 27, 2022: 127 index (high)Mar 4, 2022: 111 index (high)Mar 14, 2022: 113 index (high)Mar 19, 2022: 121 index (high)Mar 29, 2022: 102 index (high)Apr 3, 2022: 99 index (high)Apr 8, 2022: 97 index (low)Apr 23, 2022: 117 index (low)May 8, 2022: 85 index (low)May 13, 2022: 65 index (high)May 18, 2022: 75 index (high)May 28, 2022: 52 index (low)Jun 2, 2022: 98 index (low)Jun 7, 2022: 55 index (low)Jun 12, 2022: 113 index (low)Jul 12, 2022: 71 index (low)Jul 17, 2022: 96 index (low)Jul 22, 2022: 65 index (low)Jul 27, 2022: 64 index (low)Aug 1, 2022: 44 index (low)Aug 16, 2022: 53 index (low)Aug 21, 2022: 61 index (high)Aug 26, 2022: 66 index (high)Aug 31, 2022: 71 index (high)Sep 15, 2022: 111 index (high)Sep 30, 2022: 124 index (high)Oct 5, 2022: 127 index (high)Oct 10, 2022: 97 index (high)Oct 15, 2022: 141 index (high)Oct 25, 2022: 161 index (high)Oct 30, 2022: 156 index (high)Nov 4, 2022: 194 index (high)Nov 14, 2022: 176 index (high)Nov 19, 2022: 218 index (high)Nov 29, 2022: 202 index (high)Dec 4, 2022: 212 index (high)Dec 9, 2022: 223 index (high)Dec 14, 2022: 226 index (high)Dec 19, 2022: 221 index (high)Dec 24, 2022: 193 index (high)Dec 29, 2022: 224 index (high)Jan 3, 2023: 205 index (high)Jan 8, 2023: 218 index (high)Feb 7, 2023: 195 index (high)Feb 17, 2023: 206 index (high)Feb 22, 2023: 223 index (high)Feb 27, 2023: 194 index (high)Mar 4, 2023: 210 index (high)Mar 9, 2023: 200 index (high)Mar 14, 2023: 197 index (high)Mar 24, 2023: 204 index (high)Mar 29, 2023: 206 index (high)Apr 8, 2023: 228 index (high)Apr 13, 2023: 218 index (high)Apr 18, 2023: 181 index (high)Apr 23, 2023: 195 index (high)May 3, 2023: 145 index (low)May 8, 2023: 98 index (high)May 18, 2023: 69 index (high)May 28, 2023: 97 index (low)Jun 12, 2023: 119 index (low)Jun 27, 2023: 103 index (low)Jul 12, 2023: 144 index (high)Jul 22, 2023: 179 index (low)Aug 6, 2023: 244 index (high)Aug 11, 2023: 234 index (high)Aug 16, 2023: 195 index (high)Aug 21, 2023: 225 index (high)Aug 26, 2023: 229 index (high)Sep 10, 2023: 221 index (high)Sep 15, 2023: 232 index (high)Sep 25, 2023: 196 index (high)Oct 5, 2023: 229 index (high)Oct 10, 2023: 160 index (high)Oct 15, 2023: 207 index (high)Oct 20, 2023: 208 index (high)Oct 30, 2023: 221 index (high)Nov 9, 2023: 188 index (high)Nov 19, 2023: 185 index (high)Nov 29, 2023: 178 index (high)Dec 9, 2023: 201 index (high)Dec 19, 2023: 177 index (high)Feb 2, 2024: 199 index (high)Feb 7, 2024: 189 index (high)Feb 12, 2024: 204 index (high)Feb 22, 2024: 194 index (high)Feb 27, 2024: 176 index (high)Mar 3, 2024: 166 index (high)Mar 23, 2024: 167 index (high)Apr 2, 2024: 158 index (high)Apr 7, 2024: 141 index (high)Apr 12, 2024: 137 index (high)Apr 22, 2024: 334 index (high)Apr 27, 2024: 174 index (low)May 2, 2024: 136 index (high)May 7, 2024: 143 index (high)May 22, 2024: 148 index (low)May 27, 2024: 124 index (low)Jun 26, 2024: 151 index (low)Jul 6, 2024: 115 index (high)Jul 21, 2024: 134 index (high)Jul 26, 2024: 124 index (high)Aug 10, 2024: 149 index (high)Aug 15, 2024: 135 index (high)Aug 25, 2024: 145 index (high)Aug 30, 2024: 151 index (high)Sep 24, 2024: 112 index (high)Oct 4, 2024: 114 index (high)Oct 14, 2024: 105 index (high)Oct 19, 2024: 110 index (high)Oct 24, 2024: 101 index (high)Oct 29, 2024: 99 index (high)Nov 3, 2024: 88 index (high)Nov 8, 2024: 55 index (high)Nov 13, 2024: 27 index (low)Nov 23, 2024: 64 index (high)Nov 28, 2024: 59 index (high)Dec 3, 2024: 59 index (high)Dec 13, 2024: 68 index (high)Dec 23, 2024: 76 index (high)Dec 28, 2024: 80 index (high)Jan 12, 2025: 69 index (high)Jan 17, 2025: 64 index (high)Jan 27, 2025: 39 index (low)Feb 6, 2025: 39 index (low)Feb 21, 2025: 60 index (high)Feb 26, 2025: 40 index (low)Mar 3, 2025: 48 index (low)Mar 8, 2025: 32 index (low)Mar 13, 2025: 47 index (low)Mar 18, 2025: 32 index (low)Mar 28, 2025: 44 index (low)Apr 2, 2025: 79 index (low)Apr 7, 2025: 48 index (low)Apr 12, 2025: 58 index (low)Apr 17, 2025: 40 index (low)Apr 27, 2025: 38 index (low)May 9, 2025: 79 index (high)May 17, 2025: 57 index (low)May 22, 2025: 77 index (low)Jun 1, 2025: 61 index (high)Jun 6, 2025: 82 index (low)Jun 16, 2025: 56 index (low)Jun 18, 2025: 101 index (low)Jul 1, 2025: 109 index (low)Jul 6, 2025: 105 index (low)Jul 11, 2025: 125 index (low)Jul 16, 2025: 105 index (low)Jul 21, 2025: 143 index (low)Jul 26, 2025: 101 index (high)Jul 28, 2025: 133 index (high)Jul 31, 2025: 139 index (high)Aug 5, 2025: 116 index (high)Aug 15, 2025: 128 index (high)Aug 20, 2025: 163 index (high)Sep 6, 2025: 190 index (high)Sep 14, 2025: 163 index (high)Sep 19, 2025: 159 index (high)Sep 24, 2025: 162 index (high)Sep 26, 2025: 161 index (high)Sep 29, 2025: 165 index (high)Oct 14, 2025: 182 index (high)Oct 16, 2025: 204 index (high)Oct 19, 2025: 202 index (high)Oct 24, 2025: 138 index (high)Oct 29, 2025: 176 index (high)Nov 3, 2025: 168 index (high)Nov 5, 2025: 190 index (high)Nov 8, 2025: 187 index (high)Nov 13, 2025: 166 index (high)Nov 18, 2025: 190 index (high)Nov 25, 2025: 195 index (high)Nov 28, 2025: 179 index (high)Dec 3, 2025: 159 index (high)Dec 13, 2025: 197 index (high)Dec 15, 2025: 120 index (high)Dec 23, 2025: 193 index (high)Dec 28, 2025: 199 index (high)Jan 22, 2026: 187 index (high)Jan 27, 2026: 174 index (high)Feb 1, 2026: 143 index (high)Feb 6, 2026: 166 index (high)Feb 21, 2026: 162 index (high)Feb 26, 2026: 156 index (high)Mar 3, 2026: 166 index (high)Mar 8, 2026: 184 index (high)Mar 18, 2026: 173 index (high)Mar 28, 2026: 191 index (high)Apr 2, 2026: 202 index (high)Apr 4, 2026: 195 index (high)Apr 12, 2026: 176 index (high)Apr 17, 2026: 187 index (high)Apr 24, 2026: 176 index (high)Apr 27, 2026: 231 index (high)May 7, 2026: 116 index (low)May 14, 2026: 124 index (low)May 17, 2026: 113 index (low)Jun 6, 2026: 75 index (low)Jun 11, 2026: 70 index (low)Jun 16, 2026: 100 index (low)Jun 21, 2026: 67 index (low)Jul 6, 2026: 91 index (low)Jul 11, 2026: 38 index (low)Jul 13, 2026: 84 index (high)Jul 16, 2026: 121 index (low)Jul 21, 2026: 87 index (low)Jul 26, 2026: 92 index (low)Aug 15, 2026: 83 index (low)Aug 20, 2026: 56 index (low)Aug 22, 2026: 74 index (high)Aug 30, 2026: 58 index (high)Sep 4, 2026: 96 index (high)Sep 11, 2026: 77 index (high)Sep 14, 2026: 84 index (high)Oct 1, 2026: 98 index (high)
Algae signal (red-edge index), index. One dot per cloud-free scene; dates are local to the lake.

When it peaks

MonthClear scenesMedian, indexScenes rated high
Jan2013085%
Feb3511783%
Mar3811268%
Apr4316160%
May3610542%
Jun2610019%
Jul3911244%
Aug4113573%
Sep3212478%
Oct3913295%
Nov4014895%
Dec3313894%

By year (median / highest): 2016: 119 / 155 (12 scenes) · 2017: 166 / 340 (18 scenes) · 2018: 105 / 183 (42 scenes) · 2019: 97 / 174 (38 scenes) · 2020: 88 / 141 (46 scenes) · 2021: 186 / 252 (44 scenes) · 2022: 112 / 226 (48 scenes) · 2023: 200 / 244 (41 scenes) · 2024: 135 / 334 (39 scenes) · 2025: 120 / 204 (57 scenes) · 2026: 116 / 231 (37 scenes).

What a satellite can and can’t tell you

Satellites see only the surface layer, only on cloud-free days, and only away from the shoreline. They estimate algae; they do not measure toxins, and they can’t see what the lake bottom is doing. A clear reading is not a safety clearance.

For current conditions and health advisories, check the Florida DEP algal bloom page and the Florida Department of Health. If a person or pet may have been exposed to a bloom, call a doctor, a veterinarian, or Poison Help at 1-800-222-1222.

Source: Sentinel-2 MSI (ESA Copernicus), Red-edge cyanobacteria index (CI-cyano); a scene counts as a bloom when the index is above 50 and stays high relative to turbidity (bloom rule v1 (2026-10)). Snapshot exported Oct 9, 2026.

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