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Lake George algae history from satellite

We read Lake George from 408 cloud-free satellite scenes between Apr 14, 2016 – Sep 14, 2026. Here is what the surface water showed.

Clear scenes
408
Typical (median), index
41
Highest reading
382 · Dec 8, 2025
Latest scene
44 · Sep 14, 2026

Algae signal (red-edge index) over time

01002003004002017201820192020202120222023202420252026Apr 14, 2016: 47 index (low)May 14, 2016: 72 index (low)Jun 23, 2016: 91 index (high)Jul 13, 2016: 107 index (high)Aug 2, 2016: 176 index (high)Aug 22, 2016: 131 index (high)Sep 11, 2016: 168 index (high)Oct 1, 2016: 45 index (low)Oct 21, 2016: 36 index (low)Nov 10, 2016: 19 index (low)Nov 20, 2016: 24 index (low)Feb 8, 2017: 38 index (low)Mar 30, 2017: 48 index (low)Apr 19, 2017: 138 index (high)May 9, 2017: 207 index (high)May 29, 2017: 60 index (low)Jun 18, 2017: 56 index (low)Jul 28, 2017: 68 index (low)Aug 12, 2017: 73 index (low)Aug 17, 2017: 51 index (high)Sep 21, 2017: 21 index (low)Sep 26, 2017: 11 index (low)Oct 31, 2017: -1.5 index (low)Nov 20, 2017: 3.5 index (low)Nov 25, 2017: 5 index (low)Nov 30, 2017: -1 index (low)Dec 10, 2017: -0.5 index (low)Dec 20, 2017: 5.5 index (low)Dec 30, 2017: 5 index (low)Jan 4, 2018: 6.5 index (low)Jan 9, 2018: 14 index (low)Jan 19, 2018: 2.5 index (low)Feb 18, 2018: 16 index (low)Feb 23, 2018: 20 index (low)Feb 28, 2018: 22 index (low)Mar 5, 2018: 21 index (low)Mar 15, 2018: 24 index (low)Mar 30, 2018: 34 index (low)Apr 4, 2018: 27 index (low)Apr 14, 2018: 46 index (low)Apr 19, 2018: 47 index (low)Apr 24, 2018: 55 index (low)Apr 29, 2018: 30 index (low)May 4, 2018: 42 index (low)May 9, 2018: 50 index (low)May 24, 2018: 52 index (low)May 29, 2018: 97 index (low)Jun 8, 2018: 41 index (low)Jun 13, 2018: 52 index (high)Jun 18, 2018: 101 index (high)Jun 23, 2018: 113 index (low)Jun 28, 2018: 78 index (low)Jul 3, 2018: 61 index (low)Jul 13, 2018: 44 index (low)Aug 7, 2018: 11 index (low)Aug 12, 2018: 17 index (low)Aug 17, 2018: 20 index (low)Aug 27, 2018: 11 index (low)Sep 1, 2018: 26 index (low)Sep 6, 2018: 20 index (low)Sep 11, 2018: 11 index (low)Sep 16, 2018: 21 index (low)Sep 21, 2018: 15 index (low)Sep 26, 2018: 9 index (low)Oct 6, 2018: 21 index (low)Oct 16, 2018: 8 index (low)Oct 21, 2018: 15 index (low)Oct 31, 2018: 10 index (low)Nov 5, 2018: 23 index (low)Dec 5, 2018: 8 index (low)Jan 29, 2019: 28 index (low)Feb 8, 2019: 23 index (low)Feb 18, 2019: 26 index (low)Feb 23, 2019: 20 index (low)Feb 28, 2019: 23 index (low)Mar 20, 2019: 62 index (low)Apr 4, 2019: 45 index (low)Apr 24, 2019: 205 index (high)Apr 29, 2019: 243 index (high)May 14, 2019: 122 index (low)May 19, 2019: 159 index (high)May 24, 2019: 157 index (high)May 29, 2019: 168 index (high)Jun 13, 2019: 139 index (low)Jun 23, 2019: 103 index (low)Jun 28, 2019: 96 index (low)Jul 3, 2019: 67 index (high)Jul 23, 2019: 56 index (low)Jul 28, 2019: 68 index (low)Aug 12, 2019: 45 index (low)Aug 22, 2019: 33 index (low)Aug 27, 2019: 38 index (low)Sep 6, 2019: 42 index (low)Sep 11, 2019: 36 index (low)Sep 16, 2019: 41 index (low)Sep 21, 2019: 39 index (low)Oct 1, 2019: 27 index (low)Oct 11, 2019: 17 index (low)Nov 10, 2019: 4 index (low)Nov 20, 2019: 3.5 index (low)Nov 25, 2019: 4.5 index (low)Nov 30, 2019: 3.5 index (low)Dec 5, 2019: 5 index (low)Dec 10, 2019: 13 index (low)Dec 15, 2019: 5 index (low)Dec 25, 2019: 43 index (low)Jan 9, 2020: 16 index (low)Jan 24, 2020: 21 index (low)Feb 3, 2020: 21 index (low)Feb 8, 2020: 39 index (low)Feb 13, 2020: 34 index (low)Feb 18, 2020: 22 index (low)Feb 23, 2020: 41 index (low)Feb 28, 2020: 35 index (low)Mar 9, 2020: 41 index (low)Mar 14, 2020: 20 index (low)Mar 19, 2020: 32 index (low)Mar 24, 2020: 34 index (low)Apr 3, 2020: 74 index (high)Apr 28, 2020: 121 index (high)May 3, 2020: 145 index (high)May 8, 2020: 152 index (low)May 13, 2020: 175 index (low)Jun 17, 2020: 35 index (low)Jun 22, 2020: 46 index (low)Jun 27, 2020: 74 index (low)Jul 2, 2020: 89 index (low)Jul 7, 2020: 80 index (low)Jul 12, 2020: 55 index (low)Jul 17, 2020: 53 index (low)Jul 27, 2020: 68 index (low)Aug 1, 2020: 60 index (high)Aug 11, 2020: 54 index (low)Aug 16, 2020: 50 index (low)Aug 26, 2020: 49 index (low)Sep 5, 2020: 22 index (low)Sep 10, 2020: 38 index (low)Sep 25, 2020: 17 index (low)Oct 15, 2020: 8.5 index (low)Oct 25, 2020: 7.5 index (low)Oct 30, 2020: 4 index (low)Nov 4, 2020: 15 index (low)Nov 9, 2020: 108 index (low)Nov 14, 2020: 11 index (low)Nov 24, 2020: 4 index (low)Dec 9, 2020: 3.5 index (low)Dec 29, 2020: 8.5 index (low)Jan 18, 2021: 11 index (low)Jan 28, 2021: 22 index (low)Feb 2, 2021: 30 index (low)Feb 12, 2021: 18 index (low)Feb 22, 2021: 28 index (low)Mar 4, 2021: 29 index (low)Mar 9, 2021: 31 index (low)Mar 14, 2021: 13 index (low)Mar 19, 2021: 46 index (low)Mar 24, 2021: 26 index (low)Apr 3, 2021: 59 index (low)Apr 8, 2021: 43 index (low)Apr 13, 2021: 52 index (high)Apr 23, 2021: 65 index (low)Apr 28, 2021: 75 index (low)May 3, 2021: 72 index (low)May 8, 2021: 50 index (low)May 18, 2021: 108 index (low)May 23, 2021: 79 index (high)May 28, 2021: 104 index (high)Jun 12, 2021: 123 index (low)Jun 22, 2021: 125 index (low)Jun 27, 2021: 129 index (low)Jul 2, 2021: 122 index (low)Jul 17, 2021: 111 index (high)Jul 22, 2021: 131 index (high)Jul 27, 2021: 147 index (high)Aug 6, 2021: 118 index (high)Aug 11, 2021: 76 index (high)Aug 21, 2021: 73 index (high)Sep 10, 2021: 47 index (low)Sep 15, 2021: 37 index (low)Sep 25, 2021: 23 index (low)Sep 30, 2021: 21 index (low)Oct 10, 2021: 22 index (low)Nov 9, 2021: 23 index (low)Nov 14, 2021: 14 index (low)Nov 24, 2021: 28 index (low)Nov 29, 2021: 9 index (low)Dec 4, 2021: 24 index (low)Dec 24, 2021: 14 index (low)Dec 29, 2021: 12 index (low)Jan 3, 2022: 29 index (low)Jan 8, 2022: 18 index (low)Jan 13, 2022: 25 index (low)Jan 18, 2022: 32 index (low)Feb 2, 2022: 28 index (low)Feb 12, 2022: 20 index (low)Feb 22, 2022: 24 index (low)Feb 27, 2022: 17 index (low)Mar 4, 2022: 20 index (low)Mar 9, 2022: 56 index (low)Mar 14, 2022: 53 index (high)Mar 19, 2022: 54 index (low)Mar 29, 2022: 38 index (low)Apr 3, 2022: 51 index (low)Apr 8, 2022: 66 index (low)May 8, 2022: 50 index (low)May 13, 2022: 54 index (high)May 18, 2022: 49 index (low)May 23, 2022: 115 index (low)May 28, 2022: 59 index (high)Jun 2, 2022: 75 index (high)Jun 7, 2022: 92 index (high)Jun 12, 2022: 165 index (low)Jun 17, 2022: 124 index (low)Jun 22, 2022: 126 index (high)Jul 7, 2022: 138 index (high)Jul 12, 2022: 154 index (high)Jul 17, 2022: 128 index (high)Jul 22, 2022: 141 index (high)Jul 27, 2022: 145 index (high)Aug 1, 2022: 128 index (high)Aug 26, 2022: 137 index (high)Sep 15, 2022: 60 index (high)Sep 20, 2022: 61 index (high)Sep 30, 2022: 84 index (high)Oct 5, 2022: 48 index (low)Oct 10, 2022: 15 index (low)Oct 15, 2022: 8.5 index (low)Oct 20, 2022: 12 index (low)Oct 25, 2022: 3.5 index (low)Nov 4, 2022: 9.5 index (low)Nov 14, 2022: 14 index (low)Nov 24, 2022: 13 index (low)Nov 29, 2022: -0.5 index (low)Dec 4, 2022: 7.5 index (low)Dec 9, 2022: 4.5 index (low)Dec 19, 2022: 1.5 index (low)Dec 24, 2022: 0.5 index (low)Dec 29, 2022: 1.5 index (low)Jan 3, 2023: 4 index (low)Jan 8, 2023: 0 index (low)Feb 7, 2023: 15 index (low)Feb 17, 2023: 25 index (low)Feb 22, 2023: 25 index (low)Feb 27, 2023: 21 index (low)Mar 9, 2023: 31 index (low)Mar 14, 2023: 38 index (low)Mar 19, 2023: 45 index (low)Mar 24, 2023: 23 index (low)Apr 13, 2023: 53 index (low)Apr 18, 2023: 47 index (low)Apr 23, 2023: 70 index (low)May 3, 2023: 71 index (low)May 8, 2023: 56 index (high)May 13, 2023: 85 index (high)May 18, 2023: 89 index (low)May 28, 2023: 100 index (high)Jun 2, 2023: 146 index (low)Jun 12, 2023: 141 index (low)Jun 27, 2023: 97 index (low)Jul 2, 2023: 36 index (low)Jul 12, 2023: 51 index (high)Jul 22, 2023: 93 index (low)Aug 1, 2023: 72 index (high)Aug 6, 2023: 92 index (low)Aug 11, 2023: 76 index (high)Aug 21, 2023: 100 index (low)Aug 26, 2023: 63 index (high)Aug 31, 2023: 61 index (high)Sep 10, 2023: 48 index (low)Sep 15, 2023: 51 index (high)Sep 20, 2023: 45 index (low)Sep 25, 2023: 45 index (low)Oct 15, 2023: 35 index (low)Oct 20, 2023: 19 index (low)Oct 30, 2023: 20 index (low)Nov 9, 2023: 13 index (low)Nov 19, 2023: 7.8 index (low)Nov 29, 2023: 8 index (low)Dec 9, 2023: 12 index (low)Dec 19, 2023: 18 index (low)Jan 28, 2024: 13 index (low)Feb 2, 2024: 12 index (low)Feb 7, 2024: 21 index (low)Feb 12, 2024: 23 index (low)Mar 8, 2024: 25 index (low)Mar 23, 2024: 36 index (low)Apr 7, 2024: 25 index (low)Apr 12, 2024: 56 index (low)Apr 17, 2024: 29 index (low)Apr 22, 2024: 58 index (low)Apr 27, 2024: 74 index (low)May 2, 2024: 29 index (low)May 7, 2024: 76 index (low)May 22, 2024: 111 index (low)May 27, 2024: 104 index (low)Jun 6, 2024: 132 index (low)Jun 16, 2024: 82 index (high)Jun 26, 2024: 122 index (low)Jul 1, 2024: 123 index (low)Jul 6, 2024: 97 index (high)Jul 16, 2024: 141 index (high)Jul 21, 2024: 168 index (high)Aug 10, 2024: 171 index (high)Aug 20, 2024: 161 index (high)Aug 25, 2024: 144 index (high)Aug 30, 2024: 131 index (high)Sep 24, 2024: 48 index (low)Oct 4, 2024: 34 index (low)Oct 14, 2024: 27 index (low)Oct 24, 2024: 11 index (low)Oct 29, 2024: 17 index (low)Nov 3, 2024: 12 index (low)Nov 13, 2024: 13 index (low)Nov 18, 2024: 10 index (low)Nov 23, 2024: -1.5 index (low)Nov 28, 2024: 1.5 index (low)Dec 3, 2024: 5 index (low)Dec 13, 2024: 12 index (low)Dec 18, 2024: 13 index (low)Dec 28, 2024: 18 index (low)Jan 12, 2025: 4.5 index (low)Jan 17, 2025: 4.5 index (low)Feb 6, 2025: 13 index (low)Feb 21, 2025: 29 index (low)Feb 26, 2025: 17 index (low)Mar 3, 2025: 29 index (low)Mar 13, 2025: 28 index (low)Mar 18, 2025: 31 index (low)Apr 2, 2025: 43 index (low)Apr 7, 2025: 58 index (low)Apr 12, 2025: 76 index (low)Apr 17, 2025: 79 index (high)May 9, 2025: 158 index (high)May 17, 2025: 146 index (low)May 22, 2025: 113 index (low)May 29, 2025: 95 index (low)Jun 1, 2025: 71 index (high)Jun 6, 2025: 128 index (low)Jun 18, 2025: 144 index (low)Jun 21, 2025: 132 index (high)Jul 1, 2025: 169 index (low)Jul 16, 2025: 172 index (low)Jul 26, 2025: 154 index (high)Jul 28, 2025: 161 index (high)Jul 31, 2025: 189 index (high)Aug 5, 2025: 156 index (high)Aug 10, 2025: 172 index (high)Aug 15, 2025: 131 index (high)Aug 20, 2025: 122 index (high)Sep 4, 2025: 81 index (high)Sep 6, 2025: 86 index (high)Sep 14, 2025: 65 index (low)Sep 19, 2025: 55 index (high)Sep 24, 2025: 40 index (low)Sep 26, 2025: 36 index (low)Sep 29, 2025: 78 index (low)Oct 14, 2025: 17 index (low)Oct 16, 2025: 26 index (low)Oct 19, 2025: 20 index (low)Oct 24, 2025: 12 index (low)Nov 3, 2025: 9 index (low)Nov 5, 2025: 11 index (low)Nov 8, 2025: 12 index (low)Nov 13, 2025: 12 index (low)Nov 18, 2025: 7 index (low)Nov 23, 2025: 3.5 index (low)Nov 28, 2025: 3.5 index (low)Dec 3, 2025: 5 index (low)Dec 8, 2025: 382 index (low)Dec 13, 2025: 2.5 index (low)Dec 18, 2025: 19 index (low)Dec 23, 2025: 5 index (low)Jan 7, 2026: 9.5 index (low)Jan 17, 2026: 8 index (low)Jan 27, 2026: 19 index (low)Feb 1, 2026: 25 index (low)Feb 6, 2026: 28 index (low)Feb 21, 2026: 14 index (low)Mar 3, 2026: 20 index (low)Mar 8, 2026: 25 index (low)Mar 13, 2026: 39 index (low)Mar 18, 2026: 46 index (low)Mar 28, 2026: 25 index (low)Apr 2, 2026: 32 index (low)Apr 4, 2026: 41 index (low)Apr 12, 2026: 46 index (low)Apr 17, 2026: 61 index (high)Apr 24, 2026: 93 index (high)May 7, 2026: 111 index (low)May 14, 2026: 143 index (low)May 17, 2026: 153 index (low)Jun 6, 2026: 176 index (high)Jun 11, 2026: 182 index (high)Jun 21, 2026: 190 index (high)Jun 26, 2026: 197 index (high)Jul 1, 2026: 160 index (low)Jul 6, 2026: 108 index (low)Jul 11, 2026: 60 index (low)Jul 16, 2026: 58 index (high)Jul 21, 2026: 79 index (low)Aug 2, 2026: 87 index (low)Aug 15, 2026: 42 index (low)Aug 20, 2026: 39 index (low)Aug 22, 2026: 54 index (low)Aug 30, 2026: 31 index (low)Sep 9, 2026: 37 index (low)Sep 11, 2026: 49 index (low)Sep 14, 2026: 44 index (low)
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
Jan20130%
Feb34230%
Mar33313%
Apr365525%
May409833%
Jun3512237%
Jul3810747%
Aug397354%
Sep384121%
Oct29170%
Nov379.50%
Dec297.50%

By year (median / highest): 2016: 72 / 176 (11 scenes) · 2017: 29 / 207 (18 scenes) · 2018: 22 / 113 (41 scenes) · 2019: 40 / 243 (36 scenes) · 2020: 38 / 175 (41 scenes) · 2021: 45 / 147 (42 scenes) · 2022: 49 / 165 (49 scenes) · 2023: 46 / 146 (42 scenes) · 2024: 31 / 171 (40 scenes) · 2025: 49 / 382 (52 scenes) · 2026: 46 / 197 (36 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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