Logansport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Logansport clear sky chart from 2005-11-06 to 2025-10-19.

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% 3 8% 5% 4 4 4 6% 7% 35%	126275
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 36%	123613
Transparency	Day	46% 6% 12% 22% 13% 1	129843
	Night	47% 6% 11% 21% 14% 2	128119
Seeing	Day	17% 9% 27% 25% 16% 6%	17002
	Night	19% 8% 28% 30% 13% 1	26772

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% 8% 14% 5% 4 4 4 6% 6% 22%	3617
	11th to 20th	Day	13% 16% 8% 14% 7% 6% 5% 6% 4 3 18%	3620
	21st to end	Day	24% 18% 5% 11% 4 3 3 3 4 4 20%	4007
February	1st to 10th	Day	17% 14% 5% 11% 6% 5% 4 3 4 5% 24%	1980
	11th to 20th	Day	16% 13% 4 11% 6% 4 4 3 5% 6% 28%	1948
	21st to end	Day	16% 15% 6% 8% 5% 4 4 4 5% 7% 28%	1650
March	1st to 10th	Day	19% 15% 6% 9% 4 3 3 2 3 4 32%	4480
	11th to 20th	Day	10% 10% 3 6% 4 3 4 4 6% 7% 42%	4786
	21st to end	Day	18% 13% 5% 10% 5% 4 4 4 5% 7% 25%	5755
April	1st to 10th	Day	17% 11% 3 8% 4 4 5% 4 5% 7% 32%	2400
	11th to 20th	Day	17% 11% 3 6% 4 4 4 3 6% 6% 36%	2374
	21st to end	Day	19% 9% 3 6% 5% 3 4 4 5% 8% 34%	2580
May	1st to 10th	Day	19% 9% 3 7% 5% 5% 5% 4 6% 8% 30%	5862
	11th to 20th	Day	17% 6% 2 7% 5% 4 5% 4 6% 7% 36%	5861
	21st to end	Day	13% 7% 2 7% 4 5% 5% 4 6% 9% 39%	6770
June	1st to 10th	Day	11% 6% 2 7% 5% 4 5% 4 6% 9% 41%	2800
	11th to 20th	Day	10% 5% 2 5% 4 4 5% 5% 7% 9% 44%	2800
	21st to end	Day	11% 5% 2 6% 6% 5% 5% 5% 6% 8% 41%	2800
July	1st to 10th	Day	10% 6% 2 6% 4 4 5% 4 7% 10% 40%	6360
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 4 8% 11% 40%	6360
	21st to end	Day	11% 7% 3 7% 5% 4 5% 4 7% 8% 39%	6879
August	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 4 6% 10% 47%	4234
	11th to 20th	Day	8% 6% 2 5% 4 5% 5% 5% 7% 10% 45%	4019
	21st to end	Day	7% 4 2 6% 4 5% 4 4 6% 9% 50%	4312
September	1st to 10th	Day	9% 5% 2 7% 5% 4 4 4 6% 6% 48%	2385
	11th to 20th	Day	10% 3 2 5% 5% 4 4 4 6% 8% 50%	2200
	21st to end	Day	13% 6% 2 5% 4 5% 5% 4 5% 6% 45%	2200
October	1st to 10th	Day	12% 6% 2 6% 4 4 4 3 6% 8% 46%	2200
	11th to 20th	Day	15% 7% 2 7% 5% 4 5% 4 5% 7% 40%	1985
	21st to end	Day	20% 9% 3 8% 5% 4 5% 4 6% 6% 31%	1881
November	1st to 10th	Day	12% 7% 2 4 4 4 4 3 5% 6% 48%	1762
	11th to 20th	Day	18% 14% 3 7% 5% 4 4 2 4 6% 34%	1800
	21st to end	Day	19% 11% 4 9% 5% 4 3 3 5% 6% 32%	1800
December	1st to 10th	Day	11% 13% 3 8% 5% 3 3 3 4 7% 40%	2818
	11th to 20th	Day	15% 16% 6% 13% 6% 4 4 3 4 6% 23%	3008
	21st to end	Day	30% 18% 7% 11% 5% 4 4 3 4 4 10%	3982
January	1st to 10th	Night	16% 16% 7% 13% 6% 4 4 3 4 5% 22%	6348
	11th to 20th	Night	12% 22% 8% 14% 7% 5% 4 3 4 3 19%	6360
	21st to end	Night	20% 14% 6% 10% 5% 4 4 3 3 4 27%	6968
February	1st to 10th	Night	19% 14% 5% 10% 5% 4 3 3 4 5% 27%	2415
	11th to 20th	Night	13% 13% 5% 9% 6% 4 5% 3 4 6% 32%	2338
	21st to end	Night	19% 13% 3 10% 5% 3 3 2 5% 5% 31%	1980
March	1st to 10th	Night	17% 13% 4 7% 4 4 3 3 4 5% 37%	5373
	11th to 20th	Night	12% 6% 3 5% 4 5% 5% 4 5% 6% 43%	5174
	21st to end	Night	19% 9% 4 7% 4 4 5% 3 6% 6% 33%	5203
April	1st to 10th	Night	14% 10% 3 7% 4 4 4 3 5% 7% 39%	2000
	11th to 20th	Night	17% 8% 3 7% 4 3 4 3 6% 6% 38%	1975
	21st to end	Night	19% 8% 2 5% 5% 5% 4 4 6% 7% 36%	1820
May	1st to 10th	Night	20% 10% 3 9% 5% 4 4 3 5% 6% 30%	4033
	11th to 20th	Night	16% 7% 2 6% 4 4 4 3 6% 9% 39%	4032
	21st to end	Night	14% 9% 2 6% 5% 4 5% 4 5% 7% 39%	4084
June	1st to 10th	Night	9% 5% 2 5% 5% 4 4 3 6% 8% 49%	1600
	11th to 20th	Night	9% 6% 2 6% 4 3 4 5% 7% 8% 46%	1600
	21st to end	Night	10% 4 2 7% 5% 4 4 4 6% 9% 45%	1600
July	1st to 10th	Night	9% 5% 2 5% 4 5% 5% 4 7% 9% 45%	3618
	11th to 20th	Night	6% 5% 2 6% 4 4 5% 4 7% 10% 47%	3617
	21st to end	Night	10% 6% 3 8% 5% 5% 5% 4 6% 9% 40%	3990
August	1st to 10th	Night	9% 4 2 5% 3 5% 4 4 6% 9% 49%	2915
	11th to 20th	Night	7% 6% 2 6% 4 4 4 4 6% 8% 50%	3026
	21st to end	Night	8% 5% 2 5% 4 4 4 3 5% 8% 52%	3586
September	1st to 10th	Night	10% 5% 2 6% 4 3 3 4 5% 7% 51%	2000
	11th to 20th	Night	8% 4 2 3 3 3 4 3 5% 7% 58%	2195
	21st to end	Night	12% 6% 1 5% 4 5% 4 3 5% 6% 49%	2200
October	1st to 10th	Night	9% 5% 2 6% 4 4 4 3 4 6% 53%	2200
	11th to 20th	Night	17% 6% 2 6% 4 3 3 3 4 7% 45%	2366
	21st to end	Night	19% 8% 3 6% 4 5% 3 3 5% 6% 37%	2717
November	1st to 10th	Night	13% 9% 2 6% 4 4 4 3 5% 6% 46%	2536
	11th to 20th	Night	14% 10% 3 7% 5% 4 3 3 6% 7% 37%	2600
	21st to end	Night	18% 13% 4 8% 5% 4 5% 3 4 6% 31%	2600
December	1st to 10th	Night	13% 10% 4 7% 5% 3 4 4 5% 6% 41%	4349
	11th to 20th	Night	18% 16% 6% 9% 5% 4 4 3 4 4 25%	5199
	21st to end	Night	27% 18% 6% 10% 5% 5% 4 3 4 5% 13%	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	62% 5% 9% 17% 7%	3618
	11th to 20th	Day	70% 4 9% 7% 7% 2	3620
	21st to end	Day	70% 2 9% 12% 6%	4007
February	1st to 10th	Day	63% 4 11% 13% 7% 2	1980
	11th to 20th	Day	56% 4 10% 22% 7% 1	1958
	21st to end	Day	56% 6% 12% 17% 7% 1	1650
March	1st to 10th	Day	58% 4 6% 21% 10% 1	4480
	11th to 20th	Day	40% 6% 10% 34% 9%	4786
	21st to end	Day	57% 7% 14% 15% 6% 1	5757
April	1st to 10th	Day	51% 7% 12% 18% 12%	2400
	11th to 20th	Day	48% 6% 11% 22% 10% 3	2374
	21st to end	Day	48% 7% 12% 21% 10% 3	2580
May	1st to 10th	Day	50% 8% 12% 18% 11% 1	5897
	11th to 20th	Day	45% 8% 12% 22% 12% 1	5865
	21st to end	Day	40% 7% 11% 26% 15% 1	6784
June	1st to 10th	Day	38% 8% 12% 24% 16% 3	2800
	11th to 20th	Day	34% 7% 12% 25% 19% 3	2800
	21st to end	Day	38% 9% 15% 20% 15% 3	2800
July	1st to 10th	Day	37% 6% 12% 28% 15% 2	6291
	11th to 20th	Day	36% 7% 16% 27% 14% 1	6285
	21st to end	Day	41% 7% 13% 22% 15% 2	6684
August	1st to 10th	Day	30% 8% 17% 29% 15% 1	4221
	11th to 20th	Day	32% 8% 13% 30% 16% 1	4058
	21st to end	Day	29% 7% 15% 26% 19% 4	4311
September	1st to 10th	Day	34% 7% 14% 23% 18% 4	2385
	11th to 20th	Day	31% 6% 10% 27% 23% 2	2200
	21st to end	Day	38% 5% 10% 23% 21% 2	2200
October	1st to 10th	Day	27% 4 10% 32% 26% 1	3590
	11th to 20th	Day	35% 5% 10% 22% 26% 1	3214
	21st to end	Day	44% 4 9% 27% 15% 2	3081
November	1st to 10th	Day	37% 6% 13% 26% 16% 2	1762
	11th to 20th	Day	52% 5% 11% 19% 12% 2	1800
	21st to end	Day	53% 5% 12% 21% 8% 1	1800
December	1st to 10th	Day	47% 3 14% 25% 10%	2818
	11th to 20th	Day	63% 5% 12% 17% 4	3005
	21st to end	Day	78% 4 7% 8% 3	3982
January	1st to 10th	Night	64% 5% 8% 16% 7%	6348
	11th to 20th	Night	71% 3 7% 9% 8% 1	6360
	21st to end	Night	63% 3 10% 16% 8% 1	6968
February	1st to 10th	Night	60% 4 12% 16% 7% 1	2415
	11th to 20th	Night	55% 5% 11% 18% 10% 1	2339
	21st to end	Night	55% 5% 11% 18% 9% 2	1980
March	1st to 10th	Night	50% 4 7% 26% 10% 2	5373
	11th to 20th	Night	39% 7% 12% 27% 14% 2	5174
	21st to end	Night	50% 6% 12% 24% 9% 1	5203
April	1st to 10th	Night	45% 6% 12% 21% 14% 1	2000
	11th to 20th	Night	45% 6% 9% 21% 15% 3	1975
	21st to end	Night	45% 7% 10% 21% 13% 3	1820
May	1st to 10th	Night	53% 8% 9% 16% 12% 2	4060
	11th to 20th	Night	41% 8% 12% 25% 13% 1	4033
	21st to end	Night	42% 8% 10% 21% 16% 3	4092
June	1st to 10th	Night	33% 6% 12% 25% 22% 3	1600
	11th to 20th	Night	33% 8% 12% 24% 19% 4	1600
	21st to end	Night	35% 8% 15% 22% 16% 4	1600
July	1st to 10th	Night	34% 7% 12% 28% 15% 5%	3580
	11th to 20th	Night	32% 7% 16% 25% 19% 1	3572
	21st to end	Night	39% 7% 15% 20% 16% 3	3874
August	1st to 10th	Night	31% 7% 16% 28% 16% 1	2904
	11th to 20th	Night	31% 7% 13% 29% 18% 1	3053
	21st to end	Night	30% 6% 11% 29% 21% 3	3586
September	1st to 10th	Night	32% 6% 13% 25% 19% 6%	2000
	11th to 20th	Night	25% 6% 10% 28% 29% 3	2195
	21st to end	Night	35% 7% 10% 22% 23% 3	2200
October	1st to 10th	Night	22% 4 7% 33% 33% 1	3590
	11th to 20th	Night	32% 4 9% 24% 29% 1	3876
	21st to end	Night	35% 4 9% 27% 22% 2	4467
November	1st to 10th	Night	39% 5% 10% 24% 19% 2	2536
	11th to 20th	Night	46% 5% 11% 21% 15% 2	2600
	21st to end	Night	57% 4 9% 22% 8%	2600
December	1st to 10th	Night	45% 4 13% 27% 10% 1	4349
	11th to 20th	Night	62% 5% 12% 13% 8% 1	5201
	21st to end	Night	73% 5% 9% 9% 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	25% 16% 37% 15% 6% 1	300
	11th to 20th	Day	26% 16% 36% 17% 3 1	300
	21st to end	Day	29% 17% 33% 16% 4	330
February	1st to 10th	Day	26% 17% 34% 20% 3	300
	11th to 20th	Day	25% 18% 34% 17% 5% 1	300
	21st to end	Day	28% 17% 39% 13% 4	249
March	1st to 10th	Day	23% 17% 43% 15% 3	300
	11th to 20th	Day	25% 15% 33% 20% 5% 1	410
	21st to end	Day	31% 12% 32% 19% 5% 1	550
April	1st to 10th	Day	25% 12% 32% 21% 8% 2	500
	11th to 20th	Day	23% 13% 31% 18% 12% 2	492
	21st to end	Day	25% 13% 31% 21% 8% 2	500
May	1st to 10th	Day	24% 12% 29% 22% 11% 3	503
	11th to 20th	Day	20% 7% 30% 23% 15% 6%	527
	21st to end	Day	13% 5% 29% 27% 17% 10%	715
June	1st to 10th	Day	12% 7% 28% 28% 20% 5%	730
	11th to 20th	Day	11% 5% 27% 32% 19% 7%	730
	21st to end	Day	12% 5% 27% 29% 19% 8%	730
July	1st to 10th	Day	11% 3 17% 29% 25% 16%	721
	11th to 20th	Day	8% 4 20% 32% 21% 15%	718
	21st to end	Day	11% 2 15% 33% 27% 11%	774
August	1st to 10th	Day	6% 2 14% 29% 32% 17%	526
	11th to 20th	Day	11% 3 19% 29% 26% 12%	519
	21st to end	Day	7% 3 15% 29% 33% 13%	583
September	1st to 10th	Day	10% 5% 18% 29% 27% 12%	530
	11th to 20th	Day	9% 2 12% 27% 33% 17%	530
	21st to end	Day	15% 8% 22% 24% 23% 8%	530
October	1st to 10th	Day	12% 6% 25% 30% 20% 7%	530
	11th to 20th	Day	16% 16% 26% 29% 10% 2	415
	21st to end	Day	28% 12% 35% 20% 4 1	330
November	1st to 10th	Day	14% 14% 32% 26% 10% 4	300
	11th to 20th	Day	28% 14% 34% 16% 7% 1	300
	21st to end	Day	29% 13% 36% 19% 3	300
December	1st to 10th	Day	20% 17% 39% 17% 7%	300
	11th to 20th	Day	22% 15% 36% 22% 5%	300
	21st to end	Day	34% 13% 33% 16% 3	330
January	1st to 10th	Night	26% 14% 33% 23% 5%	1000
	11th to 20th	Night	23% 14% 37% 21% 4	1000
	21st to end	Night	24% 12% 36% 25% 4	1085
February	1st to 10th	Night	27% 10% 34% 26% 2	800
	11th to 20th	Night	22% 14% 37% 23% 4	783
	21st to end	Night	26% 12% 39% 20% 3	660
March	1st to 10th	Night	22% 13% 34% 26% 6%	800
	11th to 20th	Night	19% 13% 36% 26% 5% 1	800
	21st to end	Night	26% 9% 35% 25% 5%	771
April	1st to 10th	Night	18% 10% 38% 27% 7%	600
	11th to 20th	Night	22% 10% 33% 28% 7% 1	593
	21st to end	Night	24% 8% 33% 26% 9% 1	600
May	1st to 10th	Night	24% 5% 30% 33% 8%	600
	11th to 20th	Night	22% 5% 25% 32% 16% 1	591
	21st to end	Night	12% 3 24% 41% 18% 2	650
June	1st to 10th	Night	11% 4 22% 45% 18% 1	600
	11th to 20th	Night	11% 3 26% 40% 19% 1	600
	21st to end	Night	11% 2 23% 39% 24% 1	600
July	1st to 10th	Night	10% 2 13% 41% 29% 5%	585
	11th to 20th	Night	8% 2 16% 40% 29% 5%	582
	21st to end	Night	7% 3 12% 43% 32% 3	657
August	1st to 10th	Night	6% 2 11% 44% 34% 4	597
	11th to 20th	Night	8% 2 13% 42% 31% 5%	594
	21st to end	Night	10% 1 13% 35% 38% 4	660
September	1st to 10th	Night	11% 3 16% 36% 30% 5%	600
	11th to 20th	Night	10% 3 13% 40% 31% 4	795
	21st to end	Night	14% 6% 18% 36% 24% 3	800
October	1st to 10th	Night	12% 5% 23% 37% 21% 3	800
	11th to 20th	Night	21% 9% 28% 29% 12%	793
	21st to end	Night	25% 10% 33% 25% 7%	836
November	1st to 10th	Night	18% 10% 32% 29% 11% 1	780
	11th to 20th	Night	21% 15% 32% 25% 7% 1	800
	21st to end	Night	26% 11% 31% 26% 6%	800
December	1st to 10th	Night	24% 12% 36% 23% 5%	860
	11th to 20th	Night	26% 12% 31% 25% 6%	1000
	21st to end	Night	33% 11% 31% 22% 3	1100

Page generated at 2025-10-16 01:50:27. Version ac07

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