Maumee
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Maumee clear sky chart from 2005-11-06 to 2024-01-31.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	15% 8% 3 6% 5% 3 4 5% 5% 7% 39%	75018
	Night	15% 8% 4 6% 5% 3 4 4 5% 7% 39%	75123
Transparency	Day	44% 5% 11% 23% 15% 2	74727
	Night	45% 5% 11% 22% 15% 3	74935
Seeing	Day	20% 13% 27% 22% 12% 5%	14396
	Night	20% 12% 27% 25% 14% 2	24345

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	17% 13% 5% 8% 4 3 3 4 3 6% 34%	1517
	11th to 20th	Day	20% 12% 6% 8% 6% 3 3 3 4 4 30%	1520
	21st to end	Day	15% 15% 5% 7% 6% 3 4 4 4 5% 32%	1806
February	1st to 10th	Day	20% 11% 6% 8% 5% 2 3 4 5% 6% 30%	1800
	11th to 20th	Day	16% 10% 4 8% 7% 3 4 5% 5% 6% 33%	1748
	21st to end	Day	18% 14% 5% 8% 5% 2 3 4 4 6% 31%	1480
March	1st to 10th	Day	18% 9% 4 6% 4 3 4 4 4 5% 38%	1800
	11th to 20th	Day	20% 10% 4 6% 4 3 4 4 5% 6% 35%	1908
	21st to end	Day	19% 11% 4 7% 6% 3 4 5% 5% 6% 30%	2272
April	1st to 10th	Day	14% 7% 4 5% 5% 3 4 4 5% 8% 39%	2160
	11th to 20th	Day	18% 9% 3 5% 6% 3 3 3 4 6% 40%	2134
	21st to end	Day	21% 7% 3 6% 5% 3 4 4 4 7% 37%	2290
May	1st to 10th	Day	20% 7% 3 6% 5% 3 4 4 6% 6% 36%	2340
	11th to 20th	Day	20% 8% 3 5% 5% 3 3 4 5% 6% 36%	2301
	21st to end	Day	10% 6% 3 7% 7% 4 6% 7% 6% 9% 36%	2539
June	1st to 10th	Day	12% 5% 2 5% 6% 3 5% 5% 6% 8% 44%	2520
	11th to 20th	Day	8% 5% 2 6% 5% 3 5% 6% 6% 9% 44%	2520
	21st to end	Day	10% 5% 2 5% 5% 3 6% 6% 6% 9% 42%	2520
July	1st to 10th	Day	12% 5% 2 5% 6% 4 5% 6% 6% 11% 38%	2520
	11th to 20th	Day	8% 4 2 4 6% 3 6% 6% 7% 11% 44%	2520
	21st to end	Day	9% 4 2 5% 5% 3 6% 6% 7% 9% 43%	2633
August	1st to 10th	Day	9% 4 1 5% 5% 3 5% 6% 7% 10% 44%	2327
	11th to 20th	Day	10% 5% 2 5% 6% 3 6% 6% 7% 9% 41%	2172
	21st to end	Day	7% 4 2 5% 5% 3 5% 5% 6% 10% 49%	2376
September	1st to 10th	Day	13% 6% 2 5% 4 3 4 6% 5% 7% 45%	2130
	11th to 20th	Day	11% 5% 2 4 4 3 4 5% 5% 8% 48%	1980
	21st to end	Day	12% 5% 2 4 5% 3 3 4 4 7% 53%	1980
October	1st to 10th	Day	11% 5% 2 4 5% 2 4 5% 5% 6% 51%	1980
	11th to 20th	Day	13% 7% 3 4 4 3 4 5% 6% 6% 45%	1864
	21st to end	Day	20% 8% 3 5% 5% 3 4 3 5% 6% 37%	1782
November	1st to 10th	Day	10% 5% 2 4 4 2 4 4 5% 7% 53%	1672
	11th to 20th	Day	16% 9% 3 6% 4 2 4 4 5% 7% 40%	1710
	21st to end	Day	19% 9% 3 5% 4 4 3 4 4 5% 40%	1710
December	1st to 10th	Day	21% 12% 4 7% 5% 3 4 3 3 5% 33%	1710
	11th to 20th	Day	16% 14% 6% 8% 5% 2 4 4 4 5% 32%	1994
	21st to end	Day	23% 19% 7% 6% 5% 3 4 4 4 6% 20%	2783
January	1st to 10th	Night	18% 10% 5% 8% 6% 3 5% 5% 5% 5% 30%	2648
	11th to 20th	Night	20% 14% 7% 8% 7% 3 4 3 3 5% 26%	2660
	21st to end	Night	16% 13% 7% 8% 6% 3 5% 3 4 5% 30%	2769
February	1st to 10th	Night	21% 11% 6% 8% 6% 3 4 4 5% 5% 26%	2160
	11th to 20th	Night	16% 11% 5% 7% 6% 3 4 4 5% 7% 32%	2098
	21st to end	Night	21% 11% 5% 8% 5% 3 3 4 5% 5% 31%	1776
March	1st to 10th	Night	18% 9% 4 7% 4 2 3 5% 4 5% 38%	2160
	11th to 20th	Night	18% 8% 4 6% 4 3 4 4 5% 6% 37%	2052
	21st to end	Night	21% 10% 4 6% 5% 3 4 4 5% 6% 32%	2098
April	1st to 10th	Night	14% 7% 3 5% 5% 3 4 4 7% 6% 41%	1800
	11th to 20th	Night	16% 8% 3 6% 4 2 3 5% 4 6% 42%	1775
	21st to end	Night	18% 7% 3 6% 5% 2 5% 5% 6% 7% 38%	1667
May	1st to 10th	Night	17% 9% 3 7% 5% 3 5% 5% 5% 8% 34%	1620
	11th to 20th	Night	13% 7% 3 6% 5% 3 5% 5% 5% 7% 41%	1592
	21st to end	Night	8% 5% 2 6% 6% 4 7% 5% 7% 11% 39%	1732
June	1st to 10th	Night	10% 4 2 5% 4 3 4 5% 5% 8% 49%	1440
	11th to 20th	Night	8% 4 2 5% 5% 3 4 5% 6% 11% 48%	1440
	21st to end	Night	7% 3 1 4 3 2 4 6% 8% 11% 51%	1440
July	1st to 10th	Night	9% 4 2 4 6% 3 5% 5% 8% 9% 46%	1440
	11th to 20th	Night	7% 3 2 4 5% 3 4 4 7% 11% 50%	1440
	21st to end	Night	8% 5% 2 6% 5% 3 5% 4 4 8% 51%	1683
August	1st to 10th	Night	8% 4 2 4 5% 3 5% 5% 6% 9% 49%	1611
	11th to 20th	Night	7% 3 2 5% 5% 4 5% 5% 7% 10% 48%	1726
	21st to end	Night	7% 3 1 3 4 3 4 5% 6% 9% 56%	1980
September	1st to 10th	Night	12% 5% 2 4 5% 3 4 4 4 7% 50%	1811
	11th to 20th	Night	8% 4 1 4 4 3 4 3 5% 8% 55%	1980
	21st to end	Night	12% 5% 2 4 4 2 4 4 4 7% 52%	1980
October	1st to 10th	Night	9% 4 1 3 4 2 3 3 5% 6% 57%	1980
	11th to 20th	Night	16% 6% 2 5% 4 2 4 4 4 7% 46%	2093
	21st to end	Night	18% 8% 3 5% 4 2 4 4 5% 5% 42%	2574
November	1st to 10th	Night	13% 7% 3 4 4 3 3 3 4 7% 49%	2406
	11th to 20th	Night	16% 8% 3 6% 5% 2 4 3 4 6% 42%	2470
	21st to end	Night	19% 10% 4 6% 5% 3 4 3 3 6% 36%	2470
December	1st to 10th	Night	19% 11% 5% 8% 6% 3 4 4 4 5% 32%	2470
	11th to 20th	Night	19% 12% 5% 8% 5% 3 4 4 5% 5% 32%	3198
	21st to end	Night	23% 19% 5% 8% 6% 3 4 3 4 4 19%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	53% 3 10% 19% 14% 1	1518
	11th to 20th	Day	59% 4 10% 18% 9% 1	1520
	21st to end	Day	54% 4 11% 24% 5% 2	1806
February	1st to 10th	Day	56% 3 8% 21% 10% 2	1800
	11th to 20th	Day	52% 4 9% 23% 10% 2	1758
	21st to end	Day	54% 4 9% 21% 10% 3	1480
March	1st to 10th	Day	49% 4 8% 24% 14% 1	1800
	11th to 20th	Day	51% 4 10% 21% 12% 2	1908
	21st to end	Day	56% 5% 10% 21% 8% 1	2272
April	1st to 10th	Day	43% 5% 12% 23% 16% 1	2160
	11th to 20th	Day	46% 4 9% 23% 14% 3	2134
	21st to end	Day	48% 5% 9% 22% 13% 3	2290
May	1st to 10th	Day	48% 6% 13% 22% 10% 1	2340
	11th to 20th	Day	49% 5% 12% 17% 16% 1	2305
	21st to end	Day	42% 9% 14% 19% 14% 2	2539
June	1st to 10th	Day	38% 6% 11% 26% 16% 3	2520
	11th to 20th	Day	35% 6% 14% 23% 19% 3	2520
	21st to end	Day	37% 8% 14% 20% 16% 4	2520
July	1st to 10th	Day	40% 6% 15% 20% 15% 3	2451
	11th to 20th	Day	32% 8% 15% 25% 17% 2	2445
	21st to end	Day	35% 8% 16% 23% 15% 3	2487
August	1st to 10th	Day	33% 8% 14% 29% 15% 2	2314
	11th to 20th	Day	38% 6% 13% 26% 17% 2	2172
	21st to end	Day	30% 6% 14% 25% 17% 7%	2376
September	1st to 10th	Day	37% 6% 10% 25% 16% 5%	2130
	11th to 20th	Day	34% 4 12% 27% 19% 4	1980
	21st to end	Day	32% 4 10% 26% 26% 2	1980
October	1st to 10th	Day	34% 5% 10% 26% 23% 2	1980
	11th to 20th	Day	37% 4 9% 25% 21% 3	1864
	21st to end	Day	48% 3 9% 24% 14% 2	1782
November	1st to 10th	Day	32% 4 10% 32% 18% 4	1672
	11th to 20th	Day	44% 5% 9% 22% 17% 4	1710
	21st to end	Day	47% 3 9% 23% 16% 1	1710
December	1st to 10th	Day	56% 4 9% 19% 11% 1	1710
	11th to 20th	Day	55% 4 7% 22% 11% 1	1991
	21st to end	Day	65% 4 9% 13% 7% 1	2783
January	1st to 10th	Night	55% 5% 8% 20% 11% 1	2648
	11th to 20th	Night	61% 4 10% 17% 7%	2660
	21st to end	Night	58% 4 9% 19% 9% 1	2769
February	1st to 10th	Night	60% 4 11% 18% 5% 1	2160
	11th to 20th	Night	53% 4 10% 20% 11% 1	2099
	21st to end	Night	55% 4 11% 17% 11% 2	1776
March	1st to 10th	Night	47% 5% 8% 23% 16% 2	2160
	11th to 20th	Night	47% 5% 13% 21% 12% 2	2052
	21st to end	Night	53% 4 10% 24% 7% 2	2098
April	1st to 10th	Night	41% 5% 11% 27% 14% 3	1800
	11th to 20th	Night	42% 5% 10% 18% 19% 6%	1775
	21st to end	Night	45% 6% 9% 24% 13% 3	1667
May	1st to 10th	Night	49% 6% 10% 23% 10% 3	1620
	11th to 20th	Night	43% 7% 13% 20% 16% 1	1593
	21st to end	Night	37% 8% 15% 21% 13% 5%	1733
June	1st to 10th	Night	33% 5% 11% 25% 22% 4	1440
	11th to 20th	Night	31% 6% 13% 24% 20% 5%	1440
	21st to end	Night	24% 8% 17% 26% 20% 5%	1440
July	1st to 10th	Night	33% 7% 15% 23% 16% 5%	1400
	11th to 20th	Night	28% 6% 15% 29% 18% 4	1392
	21st to end	Night	31% 6% 11% 31% 17% 4	1589
August	1st to 10th	Night	29% 8% 16% 27% 17% 3	1600
	11th to 20th	Night	30% 7% 16% 27% 18% 2	1726
	21st to end	Night	25% 6% 14% 29% 21% 6%	1980
September	1st to 10th	Night	34% 5% 10% 27% 17% 7%	1811
	11th to 20th	Night	27% 6% 10% 28% 25% 4	1980
	21st to end	Night	32% 4 10% 24% 25% 4	1980
October	1st to 10th	Night	28% 4 11% 26% 26% 5%	1980
	11th to 20th	Night	39% 4 8% 25% 20% 4	2093
	21st to end	Night	45% 4 8% 23% 17% 3	2574
November	1st to 10th	Night	36% 4 9% 25% 22% 4	2406
	11th to 20th	Night	42% 5% 9% 21% 19% 4	2470
	21st to end	Night	51% 3 10% 22% 14% 1	2470
December	1st to 10th	Night	54% 4 10% 20% 11% 1	2470
	11th to 20th	Night	54% 4 9% 20% 13% 1	3200
	21st to end	Night	69% 4 8% 12% 6% 1	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	32% 21% 28% 17% 1 1	270
	11th to 20th	Day	36% 26% 29% 8% 1	270
	21st to end	Day	32% 27% 30% 9% 2	294
February	1st to 10th	Day	34% 30% 25% 10% 1	240
	11th to 20th	Day	32% 27% 32% 9%	240
	21st to end	Day	31% 26% 35% 7% 1	198
March	1st to 10th	Day	32% 26% 34% 8% 1	240
	11th to 20th	Day	34% 20% 30% 12% 4 1	348
	21st to end	Day	32% 21% 29% 14% 4 1	462
April	1st to 10th	Day	25% 18% 31% 19% 6% 1	420
	11th to 20th	Day	25% 22% 24% 20% 7% 2	412
	21st to end	Day	30% 21% 31% 10% 7% 2	420
May	1st to 10th	Day	26% 17% 31% 17% 6% 3	423
	11th to 20th	Day	24% 14% 29% 20% 8% 4	447
	21st to end	Day	14% 11% 29% 22% 17% 8%	493
June	1st to 10th	Day	13% 7% 30% 28% 16% 5%	630
	11th to 20th	Day	10% 8% 29% 32% 16% 5%	630
	21st to end	Day	13% 8% 32% 25% 16% 6%	630
July	1st to 10th	Day	13% 5% 19% 27% 22% 14%	621
	11th to 20th	Day	7% 6% 25% 33% 21% 8%	618
	21st to end	Day	10% 4 23% 34% 21% 7%	574
August	1st to 10th	Day	10% 4 17% 34% 23% 11%	446
	11th to 20th	Day	17% 4 24% 28% 22% 6%	439
	21st to end	Day	9% 4 18% 32% 26% 10%	495
September	1st to 10th	Day	13% 6% 20% 30% 22% 8%	450
	11th to 20th	Day	14% 1 18% 32% 26% 11%	450
	21st to end	Day	17% 9% 21% 26% 22% 6%	450
October	1st to 10th	Day	12% 8% 33% 28% 15% 4	450
	11th to 20th	Day	17% 20% 34% 19% 9% 1	392
	21st to end	Day	33% 14% 38% 15%	297
November	1st to 10th	Day	15% 20% 31% 25% 6% 3	270
	11th to 20th	Day	26% 20% 30% 18% 6% 1	270
	21st to end	Day	29% 15% 36% 16% 4 1	270
December	1st to 10th	Day	28% 25% 29% 13% 4 1	270
	11th to 20th	Day	29% 19% 35% 13% 3 1	270
	21st to end	Day	36% 22% 29% 10% 3	297
January	1st to 10th	Night	27% 21% 30% 18% 3	950
	11th to 20th	Night	30% 21% 32% 15% 2	950
	21st to end	Night	26% 20% 33% 19% 2	930
February	1st to 10th	Night	31% 17% 33% 17% 2	720
	11th to 20th	Night	26% 24% 31% 17% 2	703
	21st to end	Night	31% 18% 36% 14% 1	592
March	1st to 10th	Night	26% 20% 30% 22% 2	720
	11th to 20th	Night	26% 19% 31% 19% 6%	720
	21st to end	Night	27% 16% 27% 25% 5%	712
April	1st to 10th	Night	19% 15% 34% 25% 6% 1	540
	11th to 20th	Night	21% 15% 29% 24% 9% 1	533
	21st to end	Night	22% 12% 35% 24% 6% 1	540
May	1st to 10th	Night	21% 10% 33% 26% 9%	540
	11th to 20th	Night	15% 10% 28% 28% 16% 3	531
	21st to end	Night	11% 5% 26% 31% 23% 4	584
June	1st to 10th	Night	12% 5% 23% 36% 22% 1	540
	11th to 20th	Night	9% 5% 23% 40% 22% 1	540
	21st to end	Night	7% 3 25% 37% 25% 2	540
July	1st to 10th	Night	12% 1 13% 33% 31% 10%	525
	11th to 20th	Night	9% 2 16% 35% 33% 6%	522
	21st to end	Night	9% 2 15% 39% 31% 4	591
August	1st to 10th	Night	9% 2 13% 38% 34% 4	537
	11th to 20th	Night	7% 2 15% 36% 35% 5%	534
	21st to end	Night	6% 2 18% 32% 36% 7%	594
September	1st to 10th	Night	13% 4 13% 33% 32% 4	551
	11th to 20th	Night	8% 3 19% 31% 34% 5%	720
	21st to end	Night	15% 7% 22% 29% 24% 3	720
October	1st to 10th	Night	11% 7% 26% 29% 21% 5%	720
	11th to 20th	Night	19% 12% 29% 25% 13% 2	720
	21st to end	Night	23% 14% 32% 22% 8% 1	792
November	1st to 10th	Night	17% 12% 30% 27% 13% 1	740
	11th to 20th	Night	24% 17% 27% 24% 8%	760
	21st to end	Night	26% 17% 24% 26% 6%	760
December	1st to 10th	Night	27% 17% 32% 19% 5%	760
	11th to 20th	Night	27% 16% 30% 22% 5% 1	869
	21st to end	Night	34% 17% 29% 16% 3	1045

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