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 2024-11-04.

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% 9% 4 8% 5% 5% 5% 4 6% 7% 35%	101118
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 35%	97926
Transparency	Day	46% 7% 12% 21% 13% 1	104747
	Night	46% 6% 11% 21% 14% 1	102437
Seeing	Day	17% 10% 27% 24% 16% 6%	15642
	Night	19% 9% 28% 30% 13% 1	25459

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	16% 16% 11% 13% 5% 4 4 3 4 4 20%	2527
	11th to 20th	Day	15% 18% 8% 13% 6% 6% 5% 7% 5% 3 13%	2530
	21st to end	Day	27% 22% 11% 10% 4 3 2 2 3 3 13%	2942
February	1st to 10th	Day	17% 14% 6% 11% 8% 6% 4 3 5% 5% 22%	1795
	11th to 20th	Day	16% 12% 4 13% 8% 6% 5% 3 4 6% 24%	1848
	21st to end	Day	16% 16% 6% 9% 5% 4 4 4 5% 6% 26%	1570
March	1st to 10th	Day	20% 19% 4 9% 5% 4 4 3 4 5% 25%	3120
	11th to 20th	Day	13% 9% 4 8% 6% 4 4 4 5% 8% 35%	3437
	21st to end	Day	19% 12% 6% 10% 5% 4 5% 4 5% 6% 25%	3872
April	1st to 10th	Day	16% 12% 4 8% 6% 5% 4 4 5% 6% 31%	2280
	11th to 20th	Day	18% 9% 3 7% 5% 4 4 3 5% 7% 35%	2303
	21st to end	Day	19% 8% 3 7% 4 5% 5% 4 5% 8% 33%	2470
May	1st to 10th	Day	19% 8% 3 8% 5% 5% 5% 4 6% 7% 30%	4082
	11th to 20th	Day	17% 6% 2 6% 5% 4 4 4 6% 9% 36%	4081
	21st to end	Day	9% 5% 2 7% 5% 4 5% 5% 7% 9% 42%	4564
June	1st to 10th	Day	10% 5% 2 7% 5% 5% 6% 3 7% 8% 41%	2660
	11th to 20th	Day	9% 6% 2 5% 5% 5% 5% 5% 6% 9% 43%	2660
	21st to end	Day	11% 6% 2 6% 5% 5% 5% 5% 7% 8% 39%	2660
July	1st to 10th	Day	13% 7% 2 7% 5% 5% 5% 3 7% 9% 37%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 7% 10% 48%	4440
	21st to end	Day	6% 6% 3 7% 6% 6% 5% 5% 7% 9% 41%	4640
August	1st to 10th	Day	9% 5% 2 6% 4 4 6% 4 7% 9% 43%	4104
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 7% 9% 44%	4044
	21st to end	Day	7% 5% 2 6% 4 4 4 4 5% 10% 49%	4214
September	1st to 10th	Day	11% 6% 3 5% 4 4 5% 4 6% 6% 46%	2213
	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% 2 6% 4 3 3 4 7% 6% 46%	1699
	11th to 20th	Day	17% 14% 3 8% 5% 4 4 2 4 6% 33%	1710
	21st to end	Day	20% 13% 4 9% 5% 4 4 3 5% 5% 27%	1710
December	1st to 10th	Day	14% 18% 6% 12% 7% 5% 5% 3 3 5% 21%	1710
	11th to 20th	Day	14% 16% 7% 12% 6% 5% 5% 3 5% 5% 23%	1942
	21st to end	Day	23% 21% 9% 12% 6% 5% 4 3 4 3 12%	2783
January	1st to 10th	Night	17% 16% 7% 12% 6% 4 3 3 4 5% 22%	4428
	11th to 20th	Night	14% 19% 7% 16% 6% 5% 6% 4 4 4 14%	4440
	21st to end	Night	27% 18% 7% 10% 4 3 3 2 3 5% 17%	4719
February	1st to 10th	Night	18% 15% 5% 9% 7% 5% 4 3 4 5% 25%	2382
	11th to 20th	Night	13% 14% 4 10% 7% 4 4 4 5% 6% 29%	2218
	21st to end	Night	20% 12% 4 9% 5% 4 4 3 5% 5% 29%	1884
March	1st to 10th	Night	18% 14% 4 7% 4 4 4 2 4 5% 35%	3733
	11th to 20th	Night	11% 6% 2 6% 4 4 4 4 6% 8% 45%	3522
	21st to end	Night	17% 10% 4 9% 5% 4 3 4 5% 5% 34%	3788
April	1st to 10th	Night	15% 10% 2 6% 5% 3 5% 4 5% 7% 37%	1900
	11th to 20th	Night	18% 8% 3 7% 4 5% 4 4 5% 5% 37%	1825
	21st to end	Night	18% 8% 2 7% 5% 3 4 4 6% 7% 37%	1710
May	1st to 10th	Night	17% 8% 3 8% 6% 4 5% 4 6% 7% 31%	2813
	11th to 20th	Night	20% 7% 3 5% 4 3 3 3 5% 8% 39%	2812
	21st to end	Night	12% 5% 2 6% 4 4 5% 4 6% 8% 44%	2990
June	1st to 10th	Night	9% 6% 2 5% 4 4 4 3 6% 9% 47%	1520
	11th to 20th	Night	9% 6% 2 5% 4 5% 5% 4 6% 9% 47%	1520
	21st to end	Night	8% 6% 2 7% 5% 4 6% 4 6% 7% 45%	1520
July	1st to 10th	Night	9% 5% 2 7% 3 4 4 3 5% 10% 46%	2530
	11th to 20th	Night	7% 4 1 4 3 3 4 3 6% 9% 54%	2530
	21st to end	Night	9% 6% 2 6% 4 4 5% 5% 7% 10% 43%	2903
August	1st to 10th	Night	12% 5% 3 6% 4 4 5% 4 6% 9% 43%	2825
	11th to 20th	Night	8% 6% 2 7% 5% 4 4 4 6% 8% 46%	2785
	21st to end	Night	7% 5% 2 6% 4 4 4 4 7% 7% 50%	3438
September	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 5% 6% 53%	1947
	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	12% 9% 2 6% 5% 3 3 2 5% 6% 46%	2452
	11th to 20th	Night	17% 12% 3 8% 4 3 4 4 5% 7% 34%	2470
	21st to end	Night	19% 13% 5% 8% 5% 4 4 4 5% 6% 28%	2470
December	1st to 10th	Night	18% 14% 5% 9% 6% 5% 5% 4 6% 5% 24%	2470
	11th to 20th	Night	17% 15% 8% 10% 5% 4 4 3 4 4 25%	3250
	21st to end	Night	27% 18% 7% 10% 5% 5% 4 3 4 5% 13%	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	67% 6% 9% 14% 4	2528
	11th to 20th	Day	71% 6% 10% 8% 6%	2530
	21st to end	Day	78% 3 7% 9% 3	2942
February	1st to 10th	Day	64% 5% 9% 13% 7% 1	1795
	11th to 20th	Day	62% 5% 9% 17% 6%	1858
	21st to end	Day	58% 5% 13% 17% 6% 1	1570
March	1st to 10th	Day	62% 5% 8% 19% 6%	3120
	11th to 20th	Day	45% 7% 12% 27% 8% 1	3437
	21st to end	Day	58% 8% 14% 16% 3	3872
April	1st to 10th	Day	53% 7% 10% 19% 11%	2280
	11th to 20th	Day	48% 6% 11% 21% 12% 2	2303
	21st to end	Day	49% 7% 13% 18% 11% 3	2470
May	1st to 10th	Day	49% 10% 12% 21% 8%	4120
	11th to 20th	Day	43% 9% 13% 25% 9% 1	4085
	21st to end	Day	34% 10% 12% 20% 21% 2	4577
June	1st to 10th	Day	39% 8% 11% 23% 17% 2	2660
	11th to 20th	Day	36% 8% 12% 23% 18% 3	2660
	21st to end	Day	38% 10% 14% 20% 15% 3	2660
July	1st to 10th	Day	43% 6% 13% 20% 16% 3	4371
	11th to 20th	Day	30% 6% 15% 30% 18% 1	4365
	21st to end	Day	38% 8% 15% 17% 20% 2	4493
August	1st to 10th	Day	35% 7% 16% 25% 15% 1	4091
	11th to 20th	Day	34% 7% 14% 28% 16% 1	4083
	21st to end	Day	31% 6% 14% 30% 17% 3	4213
September	1st to 10th	Day	36% 8% 14% 22% 17% 4	2213
	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% 13% 27% 16% 1	1699
	11th to 20th	Day	54% 5% 11% 18% 11% 2	1710
	21st to end	Day	59% 6% 11% 17% 7% 1	1710
December	1st to 10th	Day	65% 6% 12% 12% 5%	1710
	11th to 20th	Day	61% 7% 12% 17% 3	1939
	21st to end	Day	78% 5% 6% 6% 5%	2783
January	1st to 10th	Night	63% 7% 9% 13% 7%	4428
	11th to 20th	Night	72% 5% 9% 11% 3	4440
	21st to end	Night	71% 4 9% 12% 3	4719
February	1st to 10th	Night	62% 5% 11% 13% 8% 1	2382
	11th to 20th	Night	54% 6% 11% 19% 9% 1	2219
	21st to end	Night	56% 5% 11% 16% 9% 2	1884
March	1st to 10th	Night	52% 5% 10% 24% 9%	3733
	11th to 20th	Night	35% 8% 11% 29% 15% 2	3522
	21st to end	Night	49% 8% 12% 23% 7% 1	3788
April	1st to 10th	Night	45% 7% 11% 21% 15% 1	1900
	11th to 20th	Night	46% 8% 9% 18% 17% 2	1825
	21st to end	Night	46% 7% 11% 19% 14% 3	1710
May	1st to 10th	Night	49% 9% 10% 19% 11% 2	2840
	11th to 20th	Night	43% 8% 11% 27% 10% 1	2813
	21st to end	Night	34% 9% 14% 20% 20% 3	2998
June	1st to 10th	Night	32% 6% 13% 28% 19% 3	1520
	11th to 20th	Night	34% 9% 12% 23% 20% 3	1520
	21st to end	Night	36% 9% 15% 22% 16% 3	1520
July	1st to 10th	Night	35% 5% 13% 24% 17% 6%	2490
	11th to 20th	Night	25% 6% 17% 27% 23% 2	2482
	21st to end	Night	35% 6% 16% 18% 20% 4	2810
August	1st to 10th	Night	37% 7% 14% 27% 13% 2	2814
	11th to 20th	Night	34% 8% 13% 28% 16% 2	2812
	21st to end	Night	31% 7% 13% 27% 19% 3	3438
September	1st to 10th	Night	32% 6% 13% 23% 20% 5%	1947
	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% 25% 18% 1	2452
	11th to 20th	Night	49% 5% 13% 19% 13% 2	2470
	21st to end	Night	56% 6% 12% 19% 7%	2470
December	1st to 10th	Night	60% 7% 11% 15% 7%	2470
	11th to 20th	Night	60% 8% 12% 13% 7% 1	3252
	21st to end	Night	73% 6% 10% 7% 3	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	22% 20% 33% 19% 5% 1	270
	11th to 20th	Day	24% 12% 45% 13% 6% 1	270
	21st to end	Day	29% 15% 31% 18% 7%	297
February	1st to 10th	Day	25% 18% 31% 21% 5%	270
	11th to 20th	Day	24% 19% 33% 19% 6%	270
	21st to end	Day	26% 18% 43% 10% 3	225
March	1st to 10th	Day	23% 21% 33% 19% 3 1	270
	11th to 20th	Day	23% 13% 34% 21% 7% 1	430
	21st to end	Day	29% 13% 31% 19% 6% 1	506
April	1st to 10th	Day	20% 16% 29% 22% 10% 2	460
	11th to 20th	Day	19% 17% 33% 18% 11% 3	452
	21st to end	Day	22% 14% 32% 19% 11% 2	460
May	1st to 10th	Day	23% 12% 32% 21% 9% 3	463
	11th to 20th	Day	21% 8% 26% 24% 15% 6%	487
	21st to end	Day	11% 5% 27% 30% 17% 11%	578
June	1st to 10th	Day	11% 8% 28% 32% 17% 5%	680
	11th to 20th	Day	11% 7% 32% 25% 19% 6%	680
	21st to end	Day	13% 8% 28% 27% 17% 7%	680
July	1st to 10th	Day	10% 5% 19% 31% 21% 14%	671
	11th to 20th	Day	7% 4 25% 29% 23% 12%	668
	21st to end	Day	8% 4 20% 30% 28% 11%	641
August	1st to 10th	Day	9% 4 15% 27% 27% 19%	486
	11th to 20th	Day	10% 5% 19% 28% 25% 13%	479
	21st to end	Day	9% 2 15% 29% 32% 13%	539
September	1st to 10th	Day	13% 6% 16% 27% 25% 12%	490
	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	9% 14% 37% 24% 11% 4	279
	11th to 20th	Day	24% 18% 28% 19% 10% 1	270
	21st to end	Day	28% 12% 39% 19% 3	270
December	1st to 10th	Day	19% 23% 33% 17% 8%	270
	11th to 20th	Day	21% 15% 40% 18% 5%	270
	21st to end	Day	29% 20% 32% 17% 3	297
January	1st to 10th	Night	22% 15% 35% 22% 5%	950
	11th to 20th	Night	25% 13% 35% 21% 5% 1	950
	21st to end	Night	24% 15% 34% 24% 4	945
February	1st to 10th	Night	26% 11% 36% 24% 3	760
	11th to 20th	Night	20% 13% 39% 25% 3	743
	21st to end	Night	27% 14% 37% 19% 3	628
March	1st to 10th	Night	22% 11% 33% 26% 8%	760
	11th to 20th	Night	17% 12% 38% 27% 6% 1	760
	21st to end	Night	25% 10% 31% 28% 7%	819
April	1st to 10th	Night	19% 11% 34% 30% 6%	570
	11th to 20th	Night	21% 10% 32% 28% 8% 1	563
	21st to end	Night	20% 10% 33% 27% 9% 1	570
May	1st to 10th	Night	20% 6% 32% 33% 8% 1	570
	11th to 20th	Night	22% 5% 25% 30% 17% 1	561
	21st to end	Night	12% 4 24% 38% 20% 2	617
June	1st to 10th	Night	10% 3 25% 46% 15%	570
	11th to 20th	Night	11% 4 25% 41% 19% 1	570
	21st to end	Night	8% 5% 23% 40% 23% 1	570
July	1st to 10th	Night	8% 3 17% 41% 28% 3	555
	11th to 20th	Night	8% 4 15% 39% 31% 3	552
	21st to end	Night	8% 3 16% 41% 32% 1	624
August	1st to 10th	Night	8% 2 14% 44% 28% 5%	567
	11th to 20th	Night	9% 2 15% 41% 30% 4	564
	21st to end	Night	9% 2 13% 35% 36% 5%	627
September	1st to 10th	Night	13% 3 16% 36% 29% 3	617
	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	17% 11% 33% 27% 12% 1	755
	11th to 20th	Night	23% 13% 32% 25% 7% 1	760
	21st to end	Night	25% 11% 31% 26% 7%	760
December	1st to 10th	Night	24% 14% 34% 22% 5%	760
	11th to 20th	Night	25% 13% 35% 22% 5%	921
	21st to end	Night	31% 13% 33% 21% 3	1045

Page generated at 2024-11-01 22:47:36. Version ac07

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