Fort Wayne
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Wayne clear sky chart from 2005-11-06 to 2025-09-04.

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	14% 10% 4 8% 5% 5% 5% 4 6% 7% 34%	125800
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 34%	123093
Transparency	Day	47% 6% 12% 21% 12% 1	129385
	Night	48% 6% 11% 20% 13% 1	127580
Seeing	Day	17% 11% 27% 24% 15% 6%	16789
	Night	19% 9% 28% 29% 13% 1	26560

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	12% 15% 10% 19% 7% 4 4 3 4 4 18%	3617
	11th to 20th	Day	13% 17% 8% 13% 8% 6% 5% 5% 4 3 16%	3620
	21st to end	Day	22% 18% 10% 12% 5% 4 3 3 3 3 18%	4219
February	1st to 10th	Day	17% 14% 6% 11% 8% 5% 5% 3 4 5% 21%	1890
	11th to 20th	Day	16% 13% 5% 13% 9% 6% 5% 3 3 6% 23%	1948
	21st to end	Day	16% 16% 6% 10% 5% 3 4 4 5% 6% 26%	1650
March	1st to 10th	Day	18% 15% 6% 10% 5% 4 4 2 4 4 28%	4480
	11th to 20th	Day	11% 11% 4 7% 5% 4 4 4 5% 7% 39%	4923
	21st to end	Day	18% 15% 5% 10% 6% 5% 5% 4 5% 6% 23%	5548
April	1st to 10th	Day	17% 12% 4 8% 5% 5% 4 3 5% 6% 30%	2400
	11th to 20th	Day	17% 9% 3 7% 4 4 4 3 5% 7% 35%	2426
	21st to end	Day	18% 9% 3 7% 4 4 5% 4 5% 8% 34%	2600
May	1st to 10th	Day	20% 9% 3 8% 5% 5% 5% 4 5% 6% 29%	5862
	11th to 20th	Day	17% 6% 3 7% 5% 4 4 4 6% 8% 36%	5861
	21st to end	Day	15% 6% 2 7% 5% 4 5% 4 6% 8% 38%	6563
June	1st to 10th	Day	11% 5% 2 7% 5% 5% 6% 3 7% 8% 41%	2800
	11th to 20th	Day	10% 6% 2 6% 5% 5% 5% 5% 6% 9% 42%	2800
	21st to end	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 8% 40%	2800
July	1st to 10th	Day	10% 5% 2 6% 5% 5% 6% 4 7% 10% 40%	6360
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 5% 7% 10% 42%	6360
	21st to end	Day	8% 6% 3 7% 5% 5% 5% 4 7% 9% 39%	6682
August	1st to 10th	Day	9% 5% 2 6% 4 5% 6% 4 7% 9% 43%	4234
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 4 7% 9% 44%	4174
	21st to end	Day	7% 5% 2 6% 4 4 4 4 5% 10% 49%	4347
September	1st to 10th	Day	11% 6% 3 5% 4 4 5% 4 6% 6% 46%	2249
	11th to 20th	Day	10% 5% 2 5% 3 4 4 4 7% 9% 47%	2090
	21st to end	Day	15% 7% 2 6% 4 4 4 4 5% 8% 42%	2090
October	1st to 10th	Day	13% 5% 2 7% 5% 4 4 3 6% 6% 43%	2090
	11th to 20th	Day	15% 7% 2 7% 4 4 5% 4 5% 7% 39%	1917
	21st to end	Day	19% 9% 4 8% 6% 5% 4 3 6% 7% 30%	1881
November	1st to 10th	Day	10% 8% 3 6% 4 3 3 4 7% 6% 45%	1762
	11th to 20th	Day	17% 14% 3 8% 5% 4 4 3 4 6% 32%	1800
	21st to end	Day	21% 13% 4 9% 5% 4 4 3 5% 5% 26%	1800
December	1st to 10th	Day	11% 15% 5% 12% 6% 5% 4 3 4 5% 30%	2930
	11th to 20th	Day	17% 17% 8% 11% 5% 4 4 3 4 4 22%	3045
	21st to end	Day	27% 19% 8% 11% 5% 5% 3 3 4 3 12%	3982
January	1st to 10th	Night	15% 16% 7% 16% 6% 4 3 3 4 5% 21%	6348
	11th to 20th	Night	12% 18% 8% 17% 8% 6% 5% 4 4 3 15%	6360
	21st to end	Night	21% 14% 6% 9% 5% 4 4 4 4 4 24%	6747
February	1st to 10th	Night	18% 15% 5% 9% 7% 5% 4 3 4 5% 25%	2507
	11th to 20th	Night	13% 14% 4 10% 7% 4 4 4 5% 6% 28%	2338
	21st to end	Night	19% 12% 4 9% 5% 4 4 3 5% 5% 30%	1980
March	1st to 10th	Night	17% 12% 4 7% 4 4 4 3 4 5% 36%	5373
	11th to 20th	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 43%	5036
	21st to end	Night	17% 10% 4 9% 5% 4 4 4 5% 6% 34%	5424
April	1st to 10th	Night	16% 10% 3 6% 5% 3 5% 4 5% 7% 37%	2000
	11th to 20th	Night	18% 8% 3 7% 4 5% 4 4 5% 5% 38%	1922
	21st to end	Night	17% 8% 2 7% 5% 3 4 4 6% 7% 38%	1800
May	1st to 10th	Night	21% 10% 3 8% 5% 4 4 4 4 6% 30%	4033
	11th to 20th	Night	19% 7% 3 6% 4 3 3 3 5% 9% 39%	4032
	21st to end	Night	16% 6% 2 7% 4 4 4 4 5% 8% 41%	4293
June	1st to 10th	Night	10% 6% 2 5% 4 4 4 4 6% 9% 47%	1600
	11th to 20th	Night	9% 6% 2 5% 4 5% 5% 4 6% 9% 46%	1600
	21st to end	Night	8% 6% 2 6% 5% 4 6% 4 6% 7% 46%	1600
July	1st to 10th	Night	8% 5% 2 6% 3 5% 4 3 6% 10% 47%	3618
	11th to 20th	Night	9% 5% 2 5% 4 4 4 4 6% 10% 48%	3617
	21st to end	Night	11% 6% 2 6% 4 4 4 4 6% 9% 43%	4165
August	1st to 10th	Night	12% 5% 2 6% 4 4 5% 3 6% 9% 43%	2915
	11th to 20th	Night	8% 6% 2 7% 5% 4 4 4 6% 8% 46%	2875
	21st to end	Night	7% 5% 2 6% 4 4 4 4 7% 7% 50%	3547
September	1st to 10th	Night	11% 4 2 5% 4 3 3 3 5% 6% 53%	1977
	11th to 20th	Night	9% 5% 2 4 4 4 3 3 5% 8% 54%	2090
	21st to end	Night	13% 7% 2 5% 4 4 4 3 4 6% 48%	2090
October	1st to 10th	Night	10% 5% 2 6% 3 4 3 4 6% 6% 51%	2090
	11th to 20th	Night	17% 9% 3 7% 5% 4 4 3 4 6% 39%	2261
	21st to end	Night	20% 7% 2 7% 4 3 3 4 5% 7% 37%	2717
November	1st to 10th	Night	13% 9% 2 6% 5% 3 3 2 5% 6% 45%	2536
	11th to 20th	Night	16% 12% 3 8% 4 3 4 4 5% 7% 34%	2600
	21st to end	Night	19% 14% 5% 8% 5% 4 4 4 5% 6% 28%	2600
December	1st to 10th	Night	13% 11% 4 11% 5% 5% 5% 4 6% 7% 28%	4250
	11th to 20th	Night	18% 17% 10% 11% 5% 4 4 3 4 4 21%	5156
	21st to end	Night	28% 18% 7% 10% 5% 5% 4 3 4 5% 12%	6996

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	70% 5% 8% 13% 3	3618
	11th to 20th	Day	71% 4 9% 6% 9% 1	3620
	21st to end	Day	73% 3 8% 11% 5%	4219
February	1st to 10th	Day	65% 5% 9% 13% 7% 1	1890
	11th to 20th	Day	63% 5% 9% 17% 6%	1958
	21st to end	Day	58% 5% 13% 16% 7% 1	1650
March	1st to 10th	Day	59% 5% 7% 21% 8%	4480
	11th to 20th	Day	42% 6% 12% 30% 8% 1	4923
	21st to end	Day	61% 7% 12% 15% 5% 1	5550
April	1st to 10th	Day	54% 6% 10% 18% 11%	2400
	11th to 20th	Day	49% 6% 11% 21% 11% 2	2426
	21st to end	Day	48% 6% 13% 19% 11% 3	2600
May	1st to 10th	Day	53% 8% 10% 16% 12%	5897
	11th to 20th	Day	44% 8% 13% 23% 12% 1	5865
	21st to end	Day	41% 8% 10% 23% 17% 2	6577
June	1st to 10th	Day	39% 7% 11% 23% 18% 2	2800
	11th to 20th	Day	37% 8% 12% 23% 17% 3	2800
	21st to end	Day	37% 10% 14% 21% 15% 3	2800
July	1st to 10th	Day	37% 6% 12% 26% 16% 2	6291
	11th to 20th	Day	35% 6% 16% 27% 15% 1	6285
	21st to end	Day	39% 7% 14% 21% 18% 2	6491
August	1st to 10th	Day	35% 7% 16% 25% 15% 1	4221
	11th to 20th	Day	34% 7% 14% 28% 16% 1	4213
	21st to end	Day	31% 6% 14% 30% 16% 3	4346
September	1st to 10th	Day	35% 8% 14% 23% 17% 4	2249
	11th to 20th	Day	31% 8% 13% 26% 21% 2	2090
	21st to end	Day	40% 6% 12% 23% 18% 1	2090
October	1st to 10th	Day	29% 5% 11% 35% 20% 1	3480
	11th to 20th	Day	35% 5% 12% 23% 24%	3159
	21st to end	Day	43% 4 12% 27% 13% 1	3081
November	1st to 10th	Day	37% 6% 12% 27% 16% 1	1762
	11th to 20th	Day	54% 5% 11% 18% 11% 2	1800
	21st to end	Day	59% 6% 10% 17% 7% 1	1800
December	1st to 10th	Day	56% 5% 16% 19% 4	2930
	11th to 20th	Day	65% 5% 11% 15% 4	3042
	21st to end	Day	77% 5% 6% 8% 4	3982
January	1st to 10th	Night	65% 5% 8% 15% 6%	6348
	11th to 20th	Night	72% 5% 8% 8% 7%	6360
	21st to end	Night	63% 4 13% 13% 6%	6747
February	1st to 10th	Night	63% 5% 11% 13% 8% 1	2507
	11th to 20th	Night	55% 6% 11% 18% 9% 1	2339
	21st to end	Night	56% 5% 12% 16% 9% 2	1980
March	1st to 10th	Night	49% 5% 9% 27% 9% 1	5373
	11th to 20th	Night	37% 6% 12% 30% 13% 1	5036
	21st to end	Night	49% 6% 10% 22% 11% 1	5424
April	1st to 10th	Night	46% 6% 11% 20% 15% 1	2000
	11th to 20th	Night	46% 7% 10% 18% 17% 2	1922
	21st to end	Night	46% 7% 11% 20% 14% 3	1800
May	1st to 10th	Night	54% 7% 8% 16% 12% 2	4060
	11th to 20th	Night	43% 7% 10% 25% 14% 1	4033
	21st to end	Night	40% 7% 12% 21% 18% 2	4301
June	1st to 10th	Night	33% 6% 12% 27% 19% 3	1600
	11th to 20th	Night	35% 8% 12% 24% 19% 3	1600
	21st to end	Night	35% 9% 16% 22% 16% 3	1600
July	1st to 10th	Night	33% 6% 12% 26% 19% 5%	3580
	11th to 20th	Night	32% 6% 18% 24% 19% 2	3572
	21st to end	Night	37% 6% 15% 21% 18% 3	4043
August	1st to 10th	Night	37% 7% 14% 28% 13% 2	2904
	11th to 20th	Night	34% 8% 13% 28% 16% 2	2902
	21st to end	Night	31% 7% 12% 28% 19% 3	3547
September	1st to 10th	Night	31% 6% 13% 24% 21% 5%	1977
	11th to 20th	Night	28% 6% 9% 28% 26% 2	2090
	21st to end	Night	37% 6% 10% 25% 20% 2	2090
October	1st to 10th	Night	21% 5% 8% 30% 34% 1	3480
	11th to 20th	Night	37% 4 10% 22% 27%	3758
	21st to end	Night	35% 5% 9% 31% 19% 1	4467
November	1st to 10th	Night	40% 5% 11% 26% 17% 1	2536
	11th to 20th	Night	49% 4 13% 19% 13% 2	2600
	21st to end	Night	57% 6% 12% 19% 6%	2600
December	1st to 10th	Night	53% 6% 14% 21% 5%	4250
	11th to 20th	Night	66% 6% 11% 9% 7% 1	5158
	21st to end	Night	74% 5% 9% 8% 3	6996

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	21% 21% 34% 18% 5% 1	300
	11th to 20th	Day	26% 14% 42% 12% 5% 1	300
	21st to end	Day	28% 18% 31% 16% 7%	330
February	1st to 10th	Day	26% 20% 31% 19% 5%	300
	11th to 20th	Day	25% 20% 32% 17% 6%	300
	21st to end	Day	27% 19% 43% 9% 2	249
March	1st to 10th	Day	23% 23% 33% 17% 3 1	300
	11th to 20th	Day	25% 14% 34% 20% 6% 1	469
	21st to end	Day	30% 15% 31% 18% 5% 1	550
April	1st to 10th	Day	23% 17% 28% 21% 10% 1	500
	11th to 20th	Day	21% 17% 31% 18% 10% 2	492
	21st to end	Day	22% 14% 32% 20% 10% 2	500
May	1st to 10th	Day	24% 13% 31% 20% 9% 3	503
	11th to 20th	Day	21% 8% 26% 24% 14% 6%	527
	21st to end	Day	12% 6% 28% 28% 16% 10%	625
June	1st to 10th	Day	11% 9% 28% 30% 16% 5%	730
	11th to 20th	Day	12% 7% 32% 26% 18% 6%	730
	21st to end	Day	12% 8% 28% 28% 17% 7%	730
July	1st to 10th	Day	10% 5% 20% 31% 21% 13%	721
	11th to 20th	Day	8% 5% 25% 29% 22% 11%	718
	21st to end	Day	8% 4 19% 31% 27% 11%	691
August	1st to 10th	Day	8% 4 14% 29% 27% 18%	526
	11th to 20th	Day	11% 4 18% 28% 25% 13%	519
	21st to end	Day	9% 2 16% 30% 31% 13%	583
September	1st to 10th	Day	13% 6% 16% 27% 25% 13%	502
	11th to 20th	Day	10% 3 14% 23% 35% 16%	490
	21st to end	Day	19% 10% 20% 23% 22% 8%	490
October	1st to 10th	Day	13% 8% 24% 27% 19% 9%	490
	11th to 20th	Day	16% 16% 29% 28% 9% 2	464
	21st to end	Day	25% 16% 34% 22% 2 1	330
November	1st to 10th	Day	10% 17% 36% 22% 11% 4	300
	11th to 20th	Day	24% 19% 29% 18% 9% 1	300
	21st to end	Day	30% 12% 38% 17% 3	300
December	1st to 10th	Day	19% 25% 32% 17% 7%	300
	11th to 20th	Day	23% 17% 39% 17% 5%	300
	21st to end	Day	30% 20% 31% 16% 3	330
January	1st to 10th	Night	22% 16% 35% 22% 5%	1000
	11th to 20th	Night	25% 14% 35% 20% 5% 1	1000
	21st to end	Night	24% 16% 34% 23% 4	994
February	1st to 10th	Night	27% 12% 36% 23% 3	800
	11th to 20th	Night	21% 14% 38% 24% 3	783
	21st to end	Night	26% 14% 38% 19% 3	660
March	1st to 10th	Night	22% 12% 34% 25% 8%	800
	11th to 20th	Night	18% 13% 37% 26% 6% 1	800
	21st to end	Night	25% 11% 31% 27% 6%	862
April	1st to 10th	Night	20% 11% 34% 29% 6%	600
	11th to 20th	Night	21% 11% 32% 27% 8% 1	593
	21st to end	Night	20% 10% 33% 27% 9% 1	600
May	1st to 10th	Night	21% 7% 32% 33% 8% 1	600
	11th to 20th	Night	22% 5% 26% 29% 16% 1	591
	21st to end	Night	13% 4 25% 37% 19% 2	650
June	1st to 10th	Night	11% 3 26% 46% 14%	600
	11th to 20th	Night	12% 4 26% 40% 19% 1	600
	21st to end	Night	8% 5% 23% 40% 23% 1	600
July	1st to 10th	Night	8% 3 16% 42% 28% 3	585
	11th to 20th	Night	8% 4 16% 38% 31% 3	582
	21st to end	Night	8% 3 16% 41% 32% 1	657
August	1st to 10th	Night	8% 2 14% 43% 29% 5%	597
	11th to 20th	Night	9% 2 15% 41% 30% 4	594
	21st to end	Night	8% 3 14% 35% 35% 4	660
September	1st to 10th	Night	13% 3 15% 36% 30% 3	626
	11th to 20th	Night	10% 3 14% 36% 34% 4	760
	21st to end	Night	16% 5% 23% 32% 20% 3	760
October	1st to 10th	Night	13% 4 26% 32% 22% 2	760
	11th to 20th	Night	21% 13% 27% 27% 11% 1	760
	21st to end	Night	24% 13% 30% 27% 6%	836
November	1st to 10th	Night	18% 11% 33% 26% 12% 1	780
	11th to 20th	Night	23% 13% 33% 24% 6% 1	800
	21st to end	Night	26% 12% 31% 25% 6%	800
December	1st to 10th	Night	24% 15% 34% 22% 5%	800
	11th to 20th	Night	26% 13% 34% 22% 5%	970
	21st to end	Night	32% 13% 32% 21% 3	1100

Page generated at 2025-09-01 01:51:02. Version ac07

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