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 2024-04-10.

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% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	83028
	Night	16% 10% 4 7% 5% 3 4 4 5% 6% 36%	85816
Transparency	Day	48% 7% 12% 20% 11% 2	82732
	Night	48% 6% 11% 20% 12% 2	85633
Seeing	Day	18% 8% 27% 24% 16% 7%	14795
	Night	20% 8% 28% 30% 13% 1	24815

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% 14% 10% 11% 7% 4 5% 4 6% 5% 19%	2527
	11th to 20th	Day	15% 16% 8% 12% 8% 4 5% 9% 5% 3 15%	2530
	21st to end	Day	30% 21% 7% 9% 4 2 3 2 3 4 15%	2795
February	1st to 10th	Day	18% 14% 5% 10% 7% 4 5% 4 4 5% 25%	1881
	11th to 20th	Day	16% 11% 4 10% 7% 4 4 4 5% 6% 29%	1848
	21st to end	Day	17% 14% 7% 8% 5% 3 4 4 4 6% 27%	1570
March	1st to 10th	Day	20% 17% 5% 7% 6% 3 3 3 3 5% 28%	3120
	11th to 20th	Day	12% 8% 4 6% 6% 2 5% 5% 6% 7% 39%	3342
	21st to end	Day	18% 11% 5% 8% 7% 3 4 5% 5% 7% 27%	4023
April	1st to 10th	Day	17% 11% 4 7% 5% 3 4 4 5% 7% 33%	2269
	11th to 20th	Day	18% 10% 3 6% 5% 3 5% 4 5% 7% 36%	2134
	21st to end	Day	20% 9% 3 5% 6% 3 5% 5% 5% 8% 32%	2322
May	1st to 10th	Day	17% 8% 4 6% 7% 4 5% 5% 6% 8% 31%	2340
	11th to 20th	Day	20% 7% 3 6% 6% 3 5% 5% 6% 7% 33%	2301
	21st to end	Day	11% 6% 3 6% 5% 4 5% 6% 7% 9% 38%	2658
June	1st to 10th	Day	11% 5% 2 6% 6% 3 5% 5% 6% 9% 42%	2520
	11th to 20th	Day	10% 5% 3 4 5% 3 5% 6% 6% 9% 45%	2520
	21st to end	Day	11% 5% 2 6% 6% 3 6% 6% 6% 9% 39%	2520
July	1st to 10th	Day	9% 5% 3 5% 5% 3 5% 5% 6% 10% 45%	2520
	11th to 20th	Day	8% 4 2 5% 4 4 5% 5% 6% 10% 46%	2520
	21st to end	Day	8% 5% 2 5% 6% 3 5% 6% 8% 9% 43%	2725
August	1st to 10th	Day	6% 4 2 5% 6% 4 5% 5% 7% 10% 47%	2327
	11th to 20th	Day	8% 5% 2 5% 5% 4 6% 6% 7% 10% 43%	2223
	21st to end	Day	8% 3 2 4 4 4 5% 5% 6% 9% 48%	2376
September	1st to 10th	Day	10% 5% 2 6% 6% 3 5% 4 6% 6% 45%	2147
	11th to 20th	Day	11% 4 2 5% 6% 2 5% 5% 6% 8% 47%	1980
	21st to end	Day	12% 5% 2 4 4 3 5% 5% 5% 7% 47%	1980
October	1st to 10th	Day	13% 6% 2 5% 5% 3 4 4 5% 8% 45%	1980
	11th to 20th	Day	16% 7% 3 5% 6% 3 4 6% 4 7% 39%	1805
	21st to end	Day	21% 9% 3 7% 6% 3 5% 5% 6% 5% 31%	1782
November	1st to 10th	Day	12% 6% 2 4 5% 3 5% 4 4 6% 49%	1672
	11th to 20th	Day	18% 12% 4 6% 5% 3 4 3 4 6% 35%	1710
	21st to end	Day	20% 10% 4 7% 5% 3 4 3 5% 6% 33%	1710
December	1st to 10th	Day	17% 14% 6% 9% 8% 3 4 3 3 7% 27%	1650
	11th to 20th	Day	14% 14% 6% 12% 6% 4 5% 4 4 5% 26%	1918
	21st to end	Day	26% 20% 8% 11% 7% 3 3 3 3 4 13%	2783
January	1st to 10th	Night	18% 16% 7% 10% 7% 3 4 4 4 4 23%	4428
	11th to 20th	Night	14% 21% 9% 12% 7% 4 5% 4 4 3 17%	4440
	21st to end	Night	25% 17% 8% 9% 5% 3 3 3 3 5% 19%	4870
February	1st to 10th	Night	20% 13% 6% 8% 6% 3 3 3 4 5% 28%	2295
	11th to 20th	Night	13% 12% 5% 8% 6% 3 6% 4 4 6% 33%	2218
	21st to end	Night	20% 13% 4 9% 6% 2 3 3 5% 5% 30%	1884
March	1st to 10th	Night	18% 13% 4 6% 5% 3 3 4 4 6% 35%	3733
	11th to 20th	Night	11% 6% 3 5% 5% 3 5% 5% 5% 6% 45%	3618
	21st to end	Night	20% 8% 4 7% 5% 3 4 4 5% 6% 33%	3637
April	1st to 10th	Night	14% 9% 3 6% 5% 3 5% 4 5% 7% 39%	1900
	11th to 20th	Night	18% 8% 3 6% 5% 3 4 4 6% 6% 37%	1775
	21st to end	Night	20% 7% 2 5% 5% 3 5% 4 5% 8% 36%	1638
May	1st to 10th	Night	18% 8% 3 7% 5% 3 5% 4 5% 7% 34%	1620
	11th to 20th	Night	20% 5% 3 4 5% 3 5% 5% 5% 7% 38%	1592
	21st to end	Night	10% 5% 3 5% 5% 3 6% 6% 7% 9% 41%	1615
June	1st to 10th	Night	9% 5% 2 4 5% 3 4 4 5% 8% 51%	1440
	11th to 20th	Night	8% 6% 3 5% 4 2 5% 6% 6% 8% 49%	1440
	21st to end	Night	10% 4 2 6% 5% 3 4 6% 6% 9% 44%	1440
July	1st to 10th	Night	7% 5% 3 4 5% 3 4 5% 6% 9% 49%	1440
	11th to 20th	Night	8% 4 2 4 4 3 4 4 6% 8% 54%	1440
	21st to end	Night	7% 5% 2 5% 5% 3 5% 4 6% 9% 50%	1593
August	1st to 10th	Night	6% 4 1 5% 4 4 5% 5% 7% 8% 51%	1611
	11th to 20th	Night	7% 5% 2 5% 4 3 4 5% 6% 8% 50%	1674
	21st to end	Night	8% 5% 2 4 4 3 4 5% 5% 8% 53%	1980
September	1st to 10th	Night	10% 6% 3 5% 5% 2 4 5% 5% 7% 49%	1800
	11th to 20th	Night	9% 3 2 3 3 2 5% 4 5% 8% 56%	1975
	21st to end	Night	11% 5% 2 4 4 3 4 4 5% 7% 51%	1980
October	1st to 10th	Night	10% 5% 2 5% 5% 3 4 4 4 6% 51%	1980
	11th to 20th	Night	18% 6% 2 5% 5% 2 4 4 4 6% 44%	2150
	21st to end	Night	20% 8% 3 5% 5% 3 4 4 5% 6% 36%	2574
November	1st to 10th	Night	12% 8% 2 5% 4 3 3 4 5% 6% 46%	2406
	11th to 20th	Night	15% 9% 4 6% 6% 3 3 4 6% 7% 37%	2470
	21st to end	Night	19% 11% 5% 7% 6% 3 4 4 4 6% 31%	2470
December	1st to 10th	Night	17% 13% 5% 8% 6% 3 4 4 4 6% 29%	2527
	11th to 20th	Night	17% 15% 6% 9% 6% 3 4 4 4 5% 27%	3279
	21st to end	Night	26% 18% 7% 9% 6% 4 4 4 4 5% 15%	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	65% 6% 9% 15% 5%	2528
	11th to 20th	Day	70% 6% 9% 10% 5%	2530
	21st to end	Day	76% 3 7% 10% 4	2795
February	1st to 10th	Day	62% 5% 10% 14% 8% 2	1881
	11th to 20th	Day	55% 4 10% 22% 7% 1	1858
	21st to end	Day	57% 7% 12% 17% 6% 1	1570
March	1st to 10th	Day	60% 5% 8% 18% 9% 1	3120
	11th to 20th	Day	41% 7% 11% 30% 10% 1	3342
	21st to end	Day	54% 9% 16% 18% 3	4023
April	1st to 10th	Day	50% 7% 12% 19% 12%	2269
	11th to 20th	Day	48% 6% 11% 21% 11% 3	2134
	21st to end	Day	49% 7% 12% 18% 10% 3	2322
May	1st to 10th	Day	50% 8% 13% 20% 8% 1	2340
	11th to 20th	Day	50% 8% 10% 19% 12% 1	2305
	21st to end	Day	41% 9% 12% 22% 14% 2	2658
June	1st to 10th	Day	38% 8% 12% 24% 16% 3	2520
	11th to 20th	Day	33% 8% 12% 24% 19% 3	2520
	21st to end	Day	39% 9% 16% 18% 15% 3	2520
July	1st to 10th	Day	35% 8% 14% 24% 15% 4	2451
	11th to 20th	Day	32% 7% 16% 26% 17% 2	2445
	21st to end	Day	35% 9% 14% 25% 16% 3	2574
August	1st to 10th	Day	31% 9% 17% 29% 14% 1	2314
	11th to 20th	Day	34% 10% 14% 24% 16% 1	2223
	21st to end	Day	30% 9% 14% 22% 19% 6%	2376
September	1st to 10th	Day	37% 8% 15% 21% 16% 4	2147
	11th to 20th	Day	34% 7% 11% 27% 20% 2	1980
	21st to end	Day	36% 5% 11% 25% 21% 2	1980
October	1st to 10th	Day	39% 6% 11% 24% 18% 2	1980
	11th to 20th	Day	43% 7% 10% 22% 17% 1	1805
	21st to end	Day	53% 6% 10% 20% 10% 1	1782
November	1st to 10th	Day	36% 6% 14% 26% 17% 2	1672
	11th to 20th	Day	51% 5% 11% 20% 12% 2	1710
	21st to end	Day	52% 5% 12% 22% 8% 1	1710
December	1st to 10th	Day	61% 4 12% 16% 7%	1650
	11th to 20th	Day	60% 6% 9% 22% 3	1915
	21st to end	Day	77% 4 7% 8% 3	2783
January	1st to 10th	Night	63% 7% 10% 14% 6%	4428
	11th to 20th	Night	73% 3 8% 12% 4	4440
	21st to end	Night	69% 4 9% 13% 5%	4870
February	1st to 10th	Night	59% 5% 12% 15% 8% 1	2295
	11th to 20th	Night	53% 5% 11% 19% 11% 1	2219
	21st to end	Night	56% 5% 10% 18% 9% 2	1884
March	1st to 10th	Night	51% 6% 9% 24% 9% 1	3733
	11th to 20th	Night	36% 8% 11% 27% 15% 2	3618
	21st to end	Night	50% 8% 14% 23% 6% 1	3637
April	1st to 10th	Night	44% 6% 13% 21% 14% 1	1900
	11th to 20th	Night	46% 6% 9% 21% 15% 4	1775
	21st to end	Night	46% 7% 10% 21% 13% 3	1638
May	1st to 10th	Night	49% 7% 12% 20% 11% 1	1620
	11th to 20th	Night	44% 8% 11% 22% 13% 2	1593
	21st to end	Night	37% 11% 13% 21% 15% 4	1616
June	1st to 10th	Night	32% 6% 13% 25% 21% 3	1440
	11th to 20th	Night	32% 8% 13% 24% 20% 4	1440
	21st to end	Night	35% 9% 15% 22% 15% 4	1440
July	1st to 10th	Night	32% 8% 15% 24% 15% 6%	1400
	11th to 20th	Night	26% 7% 14% 29% 21% 2	1392
	21st to end	Night	29% 8% 16% 24% 18% 6%	1504
August	1st to 10th	Night	28% 8% 15% 28% 20% 1	1600
	11th to 20th	Night	29% 9% 16% 23% 21% 2	1674
	21st to end	Night	29% 7% 13% 24% 21% 6%	1980
September	1st to 10th	Night	33% 7% 14% 23% 17% 6%	1800
	11th to 20th	Night	26% 6% 11% 29% 26% 2	1975
	21st to end	Night	33% 8% 10% 24% 23% 3	1980
October	1st to 10th	Night	35% 6% 9% 28% 21% 2	1980
	11th to 20th	Night	42% 5% 9% 25% 17% 2	2150
	21st to end	Night	48% 6% 9% 22% 14% 2	2574
November	1st to 10th	Night	38% 6% 10% 24% 20% 3	2406
	11th to 20th	Night	46% 5% 11% 21% 15% 2	2470
	21st to end	Night	56% 4 9% 22% 8%	2470
December	1st to 10th	Night	57% 6% 12% 17% 9% 1	2527
	11th to 20th	Night	57% 7% 11% 17% 7% 1	3281
	21st to end	Night	72% 6% 9% 9% 4	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	26% 16% 36% 14% 7% 1	270
	11th to 20th	Day	28% 13% 36% 19% 3 1	270
	21st to end	Day	31% 15% 32% 18% 4	297
February	1st to 10th	Day	27% 14% 35% 20% 4	270
	11th to 20th	Day	25% 16% 34% 18% 6% 1	270
	21st to end	Day	28% 16% 39% 13% 4	225
March	1st to 10th	Day	23% 17% 40% 17% 3	270
	11th to 20th	Day	25% 13% 34% 21% 6% 1	374
	21st to end	Day	30% 11% 32% 20% 6% 1	506
April	1st to 10th	Day	24% 11% 32% 22% 8% 2	457
	11th to 20th	Day	23% 11% 32% 17% 13% 3	412
	21st to end	Day	27% 13% 29% 20% 7% 3	420
May	1st to 10th	Day	24% 12% 30% 22% 10% 3	423
	11th to 20th	Day	21% 6% 30% 23% 15% 5%	447
	21st to end	Day	13% 5% 27% 25% 18% 11%	612
June	1st to 10th	Day	11% 6% 27% 29% 22% 5%	630
	11th to 20th	Day	11% 4 27% 31% 20% 8%	630
	21st to end	Day	13% 5% 27% 29% 19% 8%	630
July	1st to 10th	Day	11% 3 15% 27% 26% 18%	621
	11th to 20th	Day	8% 3 20% 32% 22% 15%	618
	21st to end	Day	11% 2 15% 32% 28% 12%	666
August	1st to 10th	Day	6% 2 12% 28% 33% 19%	446
	11th to 20th	Day	10% 3 19% 28% 27% 13%	439
	21st to end	Day	8% 2 15% 29% 32% 14%	495
September	1st to 10th	Day	11% 4 17% 29% 29% 10%	450
	11th to 20th	Day	10% 3 14% 27% 31% 15%	450
	21st to end	Day	13% 8% 22% 25% 24% 7%	450
October	1st to 10th	Day	13% 6% 27% 28% 18% 7%	450
	11th to 20th	Day	18% 18% 27% 28% 9%	353
	21st to end	Day	30% 12% 34% 21% 3 1	297
November	1st to 10th	Day	13% 12% 34% 26% 11% 4	270
	11th to 20th	Day	27% 13% 34% 16% 8% 1	270
	21st to end	Day	29% 11% 36% 20% 4	270
December	1st to 10th	Day	21% 17% 37% 17% 8%	270
	11th to 20th	Day	21% 14% 36% 23% 6%	270
	21st to end	Day	32% 14% 35% 17% 3	297
January	1st to 10th	Night	26% 14% 33% 23% 5%	950
	11th to 20th	Night	23% 14% 36% 22% 4	950
	21st to end	Night	24% 10% 35% 26% 4	1031
February	1st to 10th	Night	28% 9% 34% 27% 3	760
	11th to 20th	Night	22% 14% 36% 24% 4	743
	21st to end	Night	27% 13% 38% 19% 3	628
March	1st to 10th	Night	21% 13% 34% 26% 6%	760
	11th to 20th	Night	19% 12% 37% 27% 5% 1	760
	21st to end	Night	26% 8% 35% 26% 5%	733
April	1st to 10th	Night	18% 9% 39% 27% 7%	570
	11th to 20th	Night	22% 9% 33% 28% 8% 1	533
	21st to end	Night	26% 6% 32% 26% 9% 1	540
May	1st to 10th	Night	24% 4 30% 32% 9%	540
	11th to 20th	Night	23% 4 25% 33% 16% 1	531
	21st to end	Night	12% 3 23% 41% 20% 2	584
June	1st to 10th	Night	11% 3 21% 46% 19% 1	540
	11th to 20th	Night	11% 3 25% 40% 20% 1	540
	21st to end	Night	12% 2 22% 38% 25% 1	540
July	1st to 10th	Night	9% 1 13% 41% 30% 6%	525
	11th to 20th	Night	9% 2 15% 40% 29% 5%	522
	21st to end	Night	7% 3 12% 43% 32% 3	591
August	1st to 10th	Night	6% 1 11% 44% 33% 4	537
	11th to 20th	Night	8% 2 12% 43% 30% 5%	534
	21st to end	Night	10% 1 13% 33% 38% 4	594
September	1st to 10th	Night	12% 2 16% 36% 29% 5%	540
	11th to 20th	Night	11% 3 14% 38% 31% 4	715
	21st to end	Night	13% 5% 18% 36% 24% 3	720
October	1st to 10th	Night	13% 5% 23% 36% 20% 3	720
	11th to 20th	Night	23% 10% 28% 28% 11%	720
	21st to end	Night	27% 9% 33% 24% 7%	792
November	1st to 10th	Night	17% 10% 33% 28% 11% 1	740
	11th to 20th	Night	20% 14% 32% 26% 7% 1	760
	21st to end	Night	26% 10% 31% 27% 7%	760
December	1st to 10th	Night	24% 11% 36% 24% 5%	817
	11th to 20th	Night	25% 11% 32% 26% 6%	950
	21st to end	Night	33% 11% 31% 22% 3	1045

Page generated at 2024-04-07 09:28:14. Version ac07

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