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Lake Hancock algae history from satellite

We read Lake Hancock from 418 cloud-free satellite scenes between Feb 14, 2016 – Sep 24, 2026. Here is what the surface water showed.

Clear scenes
418
Typical (median), index
39
Highest reading
178 · Apr 28, 2021
Latest scene
94 · Sep 24, 2026

Algae signal (red-edge index) over time

0501001502002017201820192020202120222023202420252026Feb 14, 2016: 36 index (low)Apr 14, 2016: 53 index (low)May 14, 2016: 38 index (low)Jun 23, 2016: 39 index (low)Jul 13, 2016: 39 index (low)Aug 2, 2016: 48 index (low)Aug 22, 2016: 32 index (low)Sep 11, 2016: 48 index (low)Oct 1, 2016: 34 index (low)Oct 21, 2016: 19 index (low)Nov 10, 2016: 27 index (low)Nov 20, 2016: 26 index (low)Nov 30, 2016: 26 index (low)Dec 30, 2016: 34 index (low)Feb 8, 2017: 27 index (low)Mar 10, 2017: 20 index (low)Mar 30, 2017: 20 index (low)Apr 19, 2017: 32 index (low)May 9, 2017: 40 index (low)May 29, 2017: 36 index (low)Jun 18, 2017: 40 index (low)Aug 12, 2017: 37 index (low)Aug 17, 2017: 30 index (low)Sep 21, 2017: 38 index (low)Sep 26, 2017: 37 index (low)Oct 16, 2017: 34 index (low)Oct 31, 2017: 22 index (low)Nov 20, 2017: 17 index (low)Nov 25, 2017: 27 index (low)Nov 30, 2017: 39 index (low)Dec 10, 2017: 23 index (low)Dec 15, 2017: 11 index (low)Dec 20, 2017: 12 index (low)Dec 30, 2017: 22 index (low)Jan 4, 2018: 28 index (low)Jan 24, 2018: 32 index (low)Feb 18, 2018: 22 index (low)Feb 23, 2018: 30 index (low)Feb 28, 2018: 35 index (low)Mar 5, 2018: 21 index (low)Mar 15, 2018: 22 index (low)Mar 25, 2018: 29 index (low)Mar 30, 2018: 44 index (low)Apr 4, 2018: 30 index (low)Apr 9, 2018: 39 index (low)Apr 14, 2018: 54 index (low)Apr 19, 2018: 42 index (low)Apr 24, 2018: 56 index (low)May 4, 2018: 42 index (low)May 9, 2018: 39 index (low)May 24, 2018: 80 index (low)Jun 3, 2018: 78 index (low)Jun 8, 2018: 57 index (low)Jun 13, 2018: 41 index (low)Jun 18, 2018: 57 index (low)Jun 23, 2018: 75 index (low)Jun 28, 2018: 79 index (low)Jul 3, 2018: 50 index (low)Jul 13, 2018: 58 index (low)Jul 28, 2018: 49 index (low)Aug 2, 2018: 67 index (low)Aug 7, 2018: 53 index (low)Aug 12, 2018: 43 index (low)Aug 22, 2018: 24 index (low)Aug 27, 2018: 44 index (low)Sep 1, 2018: 60 index (low)Sep 6, 2018: 36 index (low)Sep 16, 2018: 35 index (low)Sep 21, 2018: 34 index (low)Sep 26, 2018: 42 index (low)Oct 6, 2018: 50 index (low)Oct 16, 2018: 46 index (low)Oct 21, 2018: 41 index (low)Oct 26, 2018: 42 index (low)Oct 31, 2018: 37 index (low)Nov 5, 2018: 32 index (low)Nov 10, 2018: 51 index (low)Nov 15, 2018: 26 index (low)Nov 25, 2018: 22 index (low)Nov 30, 2018: 24 index (low)Dec 5, 2018: 24 index (low)Dec 10, 2018: 28 index (low)Dec 25, 2018: 27 index (low)Dec 30, 2018: 13 index (low)Jan 4, 2019: 17 index (low)Jan 14, 2019: 57 index (high)Jan 29, 2019: 14 index (low)Feb 8, 2019: 18 index (low)Feb 23, 2019: 17 index (low)Feb 28, 2019: 49 index (low)Mar 10, 2019: 26 index (low)Mar 15, 2019: 16 index (low)Mar 25, 2019: 23 index (low)Apr 4, 2019: 21 index (low)Apr 9, 2019: 24 index (low)Apr 24, 2019: 21 index (low)Apr 29, 2019: 39 index (low)May 9, 2019: 42 index (low)May 19, 2019: 40 index (low)May 24, 2019: 46 index (low)May 29, 2019: 57 index (low)Jun 3, 2019: 38 index (low)Jun 13, 2019: 55 index (low)Jun 18, 2019: 75 index (low)Jun 23, 2019: 65 index (low)Jun 28, 2019: 78 index (low)Jul 3, 2019: 41 index (low)Jul 23, 2019: 32 index (low)Jul 28, 2019: 36 index (low)Aug 2, 2019: 35 index (low)Aug 22, 2019: 25 index (low)Aug 27, 2019: 35 index (low)Sep 1, 2019: 39 index (low)Sep 6, 2019: 45 index (low)Sep 11, 2019: 30 index (low)Sep 16, 2019: 33 index (low)Sep 21, 2019: 27 index (low)Sep 26, 2019: 31 index (low)Oct 1, 2019: 22 index (low)Oct 11, 2019: 38 index (low)Oct 26, 2019: 29 index (low)Nov 10, 2019: 24 index (low)Nov 20, 2019: 21 index (low)Nov 30, 2019: 22 index (low)Dec 10, 2019: 16 index (low)Dec 15, 2019: 9.5 index (low)Dec 20, 2019: 58 index (low)Dec 25, 2019: 27 index (low)Jan 9, 2020: 34 index (low)Jan 14, 2020: 36 index (low)Jan 29, 2020: 23 index (low)Feb 3, 2020: 16 index (low)Feb 8, 2020: 21 index (low)Feb 18, 2020: 68 index (high)Feb 23, 2020: 13 index (low)Feb 28, 2020: 21 index (low)Mar 14, 2020: 38 index (low)Mar 19, 2020: 16 index (low)Mar 24, 2020: 23 index (low)Mar 29, 2020: 21 index (low)Apr 3, 2020: 18 index (low)Apr 8, 2020: 27 index (low)Apr 13, 2020: 36 index (low)Apr 28, 2020: 166 index (low)May 3, 2020: 31 index (low)May 8, 2020: 38 index (low)May 13, 2020: 74 index (low)May 28, 2020: 62 index (low)Jun 17, 2020: 36 index (low)Jun 22, 2020: 25 index (low)Jun 27, 2020: 35 index (low)Jul 7, 2020: 55 index (low)Jul 12, 2020: 52 index (low)Jul 17, 2020: 63 index (low)Jul 22, 2020: 64 index (low)Jul 27, 2020: 41 index (low)Aug 1, 2020: 37 index (low)Aug 11, 2020: 29 index (low)Aug 26, 2020: 58 index (low)Sep 5, 2020: 26 index (low)Sep 10, 2020: 40 index (low)Sep 25, 2020: 35 index (low)Oct 15, 2020: 24 index (low)Oct 25, 2020: 32 index (low)Oct 30, 2020: 28 index (low)Nov 4, 2020: 32 index (low)Nov 14, 2020: 32 index (low)Nov 24, 2020: 28 index (low)Nov 29, 2020: 28 index (low)Dec 9, 2020: 21 index (low)Dec 19, 2020: 26 index (low)Dec 29, 2020: 15 index (low)Jan 18, 2021: 15 index (low)Jan 23, 2021: 21 index (low)Jan 28, 2021: 21 index (low)Feb 2, 2021: 22 index (low)Feb 22, 2021: 28 index (low)Feb 27, 2021: 13 index (low)Mar 4, 2021: 26 index (low)Mar 9, 2021: 22 index (low)Mar 14, 2021: 21 index (low)Mar 19, 2021: 29 index (low)Mar 24, 2021: 20 index (low)Apr 3, 2021: 18 index (low)Apr 8, 2021: 18 index (low)Apr 13, 2021: 26 index (low)Apr 28, 2021: 178 index (low)May 3, 2021: 39 index (low)May 8, 2021: 38 index (low)May 23, 2021: 73 index (low)May 28, 2021: 50 index (low)Jun 2, 2021: 70 index (low)Jun 12, 2021: 37 index (low)Jun 27, 2021: 111 index (low)Jul 2, 2021: 42 index (low)Jul 12, 2021: 101 index (low)Jul 17, 2021: 28 index (low)Jul 22, 2021: 49 index (low)Jul 27, 2021: 62 index (low)Aug 1, 2021: 50 index (low)Aug 6, 2021: 46 index (low)Aug 11, 2021: 45 index (low)Aug 21, 2021: 46 index (low)Aug 31, 2021: 55 index (low)Sep 10, 2021: 51 index (low)Sep 15, 2021: 28 index (low)Sep 25, 2021: 23 index (low)Sep 30, 2021: 34 index (low)Oct 10, 2021: 31 index (low)Oct 20, 2021: 31 index (low)Oct 30, 2021: 33 index (low)Nov 9, 2021: 27 index (low)Nov 19, 2021: 16 index (low)Nov 24, 2021: 25 index (low)Nov 29, 2021: 19 index (low)Dec 4, 2021: 11 index (low)Dec 9, 2021: 62 index (low)Dec 14, 2021: 55 index (low)Dec 19, 2021: 35 index (low)Dec 24, 2021: 22 index (low)Dec 29, 2021: 22 index (low)Jan 3, 2022: 23 index (low)Jan 8, 2022: 26 index (low)Jan 13, 2022: 22 index (low)Jan 18, 2022: 18 index (low)Feb 2, 2022: 27 index (low)Feb 12, 2022: 31 index (low)Feb 27, 2022: 59 index (low)Mar 4, 2022: 30 index (low)Mar 29, 2022: 29 index (low)Apr 3, 2022: 22 index (low)Apr 8, 2022: 37 index (low)May 8, 2022: 62 index (low)May 13, 2022: 69 index (low)May 18, 2022: 60 index (high)May 23, 2022: 76 index (low)Jun 7, 2022: 72 index (high)Jun 17, 2022: 85 index (low)Jun 22, 2022: 35 index (low)Jul 7, 2022: 58 index (low)Jul 12, 2022: 69 index (low)Jul 22, 2022: 72 index (low)Aug 1, 2022: 35 index (low)Aug 6, 2022: 62 index (low)Aug 16, 2022: 51 index (low)Aug 21, 2022: 77 index (high)Aug 26, 2022: 31 index (low)Aug 31, 2022: 66 index (high)Sep 5, 2022: 42 index (low)Sep 15, 2022: 32 index (low)Sep 20, 2022: 25 index (low)Sep 30, 2022: 33 index (low)Oct 5, 2022: 51 index (high)Oct 10, 2022: 52 index (low)Oct 25, 2022: 34 index (low)Oct 30, 2022: 76 index (high)Nov 4, 2022: 33 index (low)Nov 14, 2022: 46 index (low)Nov 19, 2022: 101 index (high)Nov 29, 2022: 31 index (low)Dec 4, 2022: 36 index (low)Dec 9, 2022: 28 index (low)Dec 14, 2022: 33 index (low)Dec 24, 2022: 96 index (high)Dec 29, 2022: 17 index (low)Jan 8, 2023: 35 index (low)Feb 7, 2023: 25 index (low)Feb 17, 2023: 31 index (low)Feb 22, 2023: 32 index (low)Mar 9, 2023: 52 index (low)Mar 14, 2023: 40 index (low)Mar 24, 2023: 36 index (low)Mar 29, 2023: 36 index (low)Apr 18, 2023: 33 index (low)Apr 23, 2023: 32 index (low)May 3, 2023: 47 index (low)May 8, 2023: 49 index (low)May 13, 2023: 51 index (low)May 18, 2023: 43 index (low)Jun 7, 2023: 61 index (low)Jun 27, 2023: 87 index (low)Jul 12, 2023: 73 index (low)Jul 22, 2023: 69 index (low)Aug 1, 2023: 56 index (low)Aug 6, 2023: 67 index (low)Aug 11, 2023: 43 index (low)Aug 26, 2023: 22 index (low)Sep 15, 2023: 89 index (high)Sep 20, 2023: 51 index (high)Oct 5, 2023: 37 index (low)Oct 15, 2023: 35 index (low)Oct 20, 2023: 90 index (high)Oct 25, 2023: 50 index (high)Oct 30, 2023: 28 index (low)Nov 4, 2023: 44 index (low)Nov 19, 2023: 36 index (low)Nov 29, 2023: 76 index (low)Dec 19, 2023: 35 index (low)Dec 29, 2023: 78 index (high)Feb 2, 2024: 38 index (low)Feb 7, 2024: 52 index (high)Feb 22, 2024: 46 index (low)Feb 27, 2024: 50 index (low)Mar 3, 2024: 26 index (low)Mar 23, 2024: 64 index (low)Apr 7, 2024: 73 index (high)Apr 12, 2024: 72 index (low)Apr 17, 2024: 77 index (low)Apr 22, 2024: 61 index (low)May 2, 2024: 85 index (low)May 7, 2024: 76 index (high)May 22, 2024: 85 index (low)May 27, 2024: 60 index (low)Jun 6, 2024: 70 index (low)Jun 16, 2024: 62 index (high)Jun 21, 2024: 63 index (high)Jun 26, 2024: 102 index (low)Jul 21, 2024: 82 index (low)Jul 26, 2024: 36 index (low)Aug 10, 2024: 70 index (low)Aug 15, 2024: 68 index (low)Aug 25, 2024: 136 index (high)Aug 30, 2024: 92 index (high)Sep 29, 2024: 23 index (low)Oct 4, 2024: 41 index (low)Oct 14, 2024: 61 index (high)Oct 19, 2024: 37 index (low)Oct 24, 2024: 43 index (low)Oct 29, 2024: 104 index (high)Nov 18, 2024: 56 index (high)Nov 23, 2024: 36 index (low)Nov 28, 2024: 96 index (high)Dec 3, 2024: 39 index (low)Dec 13, 2024: 50 index (low)Dec 23, 2024: 49 index (low)Jan 2, 2025: 11 index (low)Jan 12, 2025: 40 index (low)Jan 17, 2025: 8.8 index (low)Jan 27, 2025: 88 index (high)Feb 6, 2025: 24 index (low)Feb 26, 2025: 63 index (high)Mar 3, 2025: 72 index (high)Mar 8, 2025: 81 index (high)Mar 13, 2025: 17 index (low)Mar 18, 2025: 69 index (high)Mar 28, 2025: 24 index (low)Apr 2, 2025: 53 index (low)Apr 12, 2025: 87 index (low)Apr 17, 2025: 80 index (high)Apr 27, 2025: 51 index (low)May 2, 2025: 92 index (high)May 9, 2025: 43 index (low)May 17, 2025: 46 index (low)May 22, 2025: 29 index (low)May 27, 2025: 54 index (low)May 29, 2025: 59 index (low)Jun 1, 2025: 51 index (low)Jun 6, 2025: 63 index (low)Jun 16, 2025: 58 index (low)Jun 18, 2025: 83 index (low)Jun 21, 2025: 53 index (low)Jul 1, 2025: 76 index (low)Jul 16, 2025: 42 index (low)Jul 21, 2025: 91 index (low)Jul 26, 2025: 51 index (low)Jul 28, 2025: 52 index (low)Jul 31, 2025: 40 index (low)Aug 5, 2025: 48 index (low)Aug 15, 2025: 26 index (low)Aug 20, 2025: 59 index (low)Aug 30, 2025: 49 index (low)Sep 6, 2025: 36 index (low)Sep 14, 2025: 20 index (low)Sep 19, 2025: 45 index (low)Sep 24, 2025: 37 index (low)Sep 29, 2025: 43 index (low)Oct 14, 2025: 53 index (high)Oct 19, 2025: 30 index (low)Oct 24, 2025: 40 index (low)Oct 29, 2025: 25 index (low)Nov 3, 2025: 44 index (low)Nov 5, 2025: 55 index (high)Nov 8, 2025: 50 index (low)Nov 13, 2025: 42 index (low)Nov 18, 2025: 48 index (low)Nov 23, 2025: 57 index (high)Dec 13, 2025: 74 index (high)Dec 15, 2025: 67 index (high)Dec 28, 2025: 43 index (low)Jan 2, 2026: 48 index (low)Jan 7, 2026: 37 index (low)Jan 17, 2026: 110 index (high)Jan 22, 2026: 60 index (low)Jan 27, 2026: 32 index (low)Feb 1, 2026: 24 index (low)Feb 6, 2026: 93 index (high)Feb 21, 2026: 63 index (high)Mar 28, 2026: 66 index (high)Apr 12, 2026: 44 index (low)Apr 17, 2026: 131 index (high)Apr 24, 2026: 121 index (high)May 7, 2026: 112 index (low)May 22, 2026: 60 index (low)Jun 6, 2026: 93 index (low)Jun 16, 2026: 89 index (low)Jun 21, 2026: 74 index (low)Jun 23, 2026: 112 index (low)Jun 26, 2026: 51 index (low)Jul 1, 2026: 53 index (low)Jul 11, 2026: 53 index (low)Jul 16, 2026: 118 index (low)Jul 26, 2026: 53 index (low)Aug 15, 2026: 72 index (low)Aug 30, 2026: 127 index (high)Sep 9, 2026: 34 index (low)Sep 11, 2026: 142 index (high)Sep 14, 2026: 87 index (high)Sep 24, 2026: 94 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
Jan252812%
Feb313016%
Mar322613%
Apr344112%
May38508%
Jun38638%
Jul34530%
Aug404813%
Sep373611%
Oct363719%
Nov383213%
Dec352811%

By year (median / highest): 2016: 35 / 53 (14 scenes) · 2017: 29 / 40 (20 scenes) · 2018: 41 / 80 (50 scenes) · 2019: 32 / 78 (44 scenes) · 2020: 32 / 166 (44 scenes) · 2021: 31 / 178 (49 scenes) · 2022: 36 / 101 (44 scenes) · 2023: 44 / 90 (34 scenes) · 2024: 61 / 136 (36 scenes) · 2025: 50 / 92 (54 scenes) · 2026: 72 / 142 (29 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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