Muncie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muncie 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	14% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	75033
	Night	15% 10% 4 7% 6% 3 4 4 5% 7% 36%	75108
Transparency	Day	48% 6% 12% 20% 12% 2	74742
	Night	48% 6% 11% 20% 13% 2	74920
Seeing	Day	17% 10% 27% 24% 16% 7%	14454
	Night	19% 9% 29% 29% 14% 2	24415

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% 15% 7% 10% 7% 5% 6% 4 5% 4 21%	1517
	11th to 20th	Day	17% 15% 10% 10% 7% 4 5% 5% 4 4 18%	1520
	21st to end	Day	15% 19% 9% 10% 8% 4 5% 4 4 5% 17%	1793
February	1st to 10th	Day	19% 14% 7% 10% 7% 4 5% 3 3 5% 22%	1742
	11th to 20th	Day	15% 12% 5% 13% 8% 4 5% 4 4 6% 26%	1748
	21st to end	Day	17% 14% 7% 9% 5% 3 4 4 4 6% 27%	1480
March	1st to 10th	Day	18% 12% 5% 8% 7% 3 4 5% 5% 6% 29%	1800
	11th to 20th	Day	17% 10% 5% 8% 8% 3 3 5% 4 7% 29%	1944
	21st to end	Day	22% 12% 5% 8% 6% 2 4 3 4 7% 26%	2218
April	1st to 10th	Day	14% 11% 5% 7% 6% 3 5% 5% 5% 7% 32%	2160
	11th to 20th	Day	17% 9% 3 7% 5% 3 4 4 5% 7% 36%	2153
	21st to end	Day	21% 9% 3 6% 6% 3 4 5% 5% 7% 32%	2340
May	1st to 10th	Day	18% 9% 3 6% 7% 4 5% 5% 6% 7% 31%	2340
	11th to 20th	Day	20% 8% 2 5% 5% 3 5% 5% 6% 7% 33%	2301
	21st to end	Day	10% 5% 3 7% 7% 4 6% 6% 7% 9% 35%	2536
June	1st to 10th	Day	11% 6% 3 6% 5% 3 6% 6% 6% 8% 41%	2520
	11th to 20th	Day	10% 5% 2 6% 6% 3 5% 6% 6% 9% 42%	2520
	21st to end	Day	11% 5% 3 6% 6% 3 5% 5% 6% 9% 39%	2520
July	1st to 10th	Day	11% 5% 2 5% 6% 4 5% 7% 8% 10% 37%	2520
	11th to 20th	Day	8% 4 2 4 6% 3 5% 6% 6% 10% 47%	2520
	21st to end	Day	9% 4 2 5% 5% 3 6% 6% 7% 10% 42%	2622
August	1st to 10th	Day	7% 5% 2 5% 4 3 4 6% 7% 10% 46%	2327
	11th to 20th	Day	9% 5% 2 6% 6% 4 6% 7% 7% 9% 39%	2277
	21st to end	Day	8% 4 2 5% 4 3 4 5% 8% 10% 45%	2376
September	1st to 10th	Day	12% 5% 3 5% 5% 3 4 5% 5% 8% 45%	2100
	11th to 20th	Day	10% 5% 3 3 4 3 5% 5% 7% 8% 45%	1980
	21st to end	Day	14% 6% 2 4 4 2 4 4 4 6% 48%	1980
October	1st to 10th	Day	13% 5% 3 6% 5% 4 3 4 5% 7% 46%	1980
	11th to 20th	Day	14% 6% 2 5% 5% 3 4 5% 5% 7% 43%	1842
	21st to end	Day	20% 10% 4 6% 5% 3 4 4 5% 7% 32%	1782
November	1st to 10th	Day	8% 7% 3 6% 4 3 4 3 5% 7% 49%	1672
	11th to 20th	Day	15% 13% 4 8% 6% 3 3 4 4 6% 33%	1710
	21st to end	Day	19% 12% 5% 8% 4 3 4 4 4 6% 32%	1710
December	1st to 10th	Day	18% 16% 6% 11% 6% 3 4 4 4 5% 24%	1710
	11th to 20th	Day	14% 16% 8% 11% 5% 3 5% 4 4 5% 25%	1990
	21st to end	Day	21% 22% 10% 11% 7% 3 4 3 4 4 12%	2783
January	1st to 10th	Night	17% 13% 8% 10% 9% 3 4 4 4 4 24%	2648
	11th to 20th	Night	17% 18% 6% 11% 8% 3 4 3 4 4 22%	2660
	21st to end	Night	17% 16% 7% 11% 7% 4 4 4 3 4 23%	2787
February	1st to 10th	Night	20% 14% 5% 9% 7% 3 5% 4 4 5% 24%	2214
	11th to 20th	Night	14% 13% 6% 9% 7% 3 4 4 5% 7% 29%	2098
	21st to end	Night	19% 12% 5% 9% 7% 3 4 3 5% 5% 27%	1776
March	1st to 10th	Night	16% 10% 4 8% 5% 4 4 4 5% 6% 34%	2160
	11th to 20th	Night	14% 11% 3 6% 6% 2 5% 4 5% 8% 36%	2016
	21st to end	Night	22% 10% 4 6% 5% 3 4 3 4 6% 33%	2152
April	1st to 10th	Night	13% 8% 4 6% 5% 3 5% 5% 6% 7% 38%	1800
	11th to 20th	Night	16% 7% 3 5% 5% 4 4 4 6% 7% 38%	1754
	21st to end	Night	17% 8% 3 6% 5% 2 5% 5% 6% 8% 35%	1620
May	1st to 10th	Night	19% 10% 4 7% 6% 3 5% 5% 5% 7% 30%	1620
	11th to 20th	Night	18% 7% 4 5% 4 3 4 5% 5% 7% 39%	1592
	21st to end	Night	8% 4 2 6% 6% 4 4 5% 7% 10% 43%	1735
June	1st to 10th	Night	8% 5% 2 6% 5% 3 5% 5% 5% 8% 49%	1440
	11th to 20th	Night	8% 4 2 5% 4 3 4 4 6% 11% 48%	1440
	21st to end	Night	8% 4 2 6% 5% 3 4 6% 7% 12% 43%	1440
July	1st to 10th	Night	9% 5% 3 4 6% 3 5% 5% 6% 8% 47%	1440
	11th to 20th	Night	7% 4 2 3 5% 3 5% 5% 7% 9% 51%	1440
	21st to end	Night	8% 5% 2 5% 5% 3 5% 4 5% 9% 50%	1693
August	1st to 10th	Night	7% 4 2 5% 5% 3 6% 4 7% 8% 48%	1611
	11th to 20th	Night	8% 5% 2 4 5% 2 4 5% 6% 8% 51%	1620
	21st to end	Night	6% 3 2 4 6% 3 4 6% 7% 8% 52%	1980
September	1st to 10th	Night	12% 5% 3 5% 5% 2 3 5% 5% 8% 47%	1841
	11th to 20th	Night	9% 5% 2 4 4 2 3 4 4 8% 55%	1980
	21st to end	Night	11% 6% 2 4 4 2 4 4 4 7% 52%	1980
October	1st to 10th	Night	11% 5% 2 4 4 2 4 4 4 7% 52%	1980
	11th to 20th	Night	17% 8% 3 5% 4 2 4 3 5% 5% 43%	2114
	21st to end	Night	19% 8% 3 6% 6% 3 4 4 5% 6% 37%	2574
November	1st to 10th	Night	12% 9% 3 5% 4 2 4 3 4 7% 47%	2406
	11th to 20th	Night	15% 10% 4 7% 6% 2 4 4 5% 8% 36%	2470
	21st to end	Night	19% 13% 5% 7% 6% 3 4 4 5% 6% 30%	2470
December	1st to 10th	Night	18% 13% 6% 8% 6% 3 5% 4 5% 6% 26%	2470
	11th to 20th	Night	17% 13% 8% 10% 6% 3 4 3 4 5% 26%	3203
	21st to end	Night	22% 20% 8% 10% 6% 3 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% 4 9% 13% 8%	1518
	11th to 20th	Day	68% 5% 10% 12% 5%	1520
	21st to end	Day	69% 5% 9% 11% 4 1	1793
February	1st to 10th	Day	67% 4 9% 12% 8% 1	1742
	11th to 20th	Day	60% 4 10% 18% 7%	1758
	21st to end	Day	58% 5% 11% 17% 8% 2	1480
March	1st to 10th	Day	56% 4 10% 20% 9% 1	1800
	11th to 20th	Day	55% 5% 13% 17% 9% 1	1944
	21st to end	Day	60% 4 12% 19% 4 1	2218
April	1st to 10th	Day	51% 6% 12% 19% 12% 1	2160
	11th to 20th	Day	47% 6% 11% 21% 11% 4	2153
	21st to end	Day	51% 5% 13% 19% 10% 2	2340
May	1st to 10th	Day	51% 8% 12% 19% 9% 1	2340
	11th to 20th	Day	50% 8% 11% 17% 13% 1	2305
	21st to end	Day	43% 9% 13% 21% 13% 1	2536
June	1st to 10th	Day	40% 8% 11% 24% 15% 3	2520
	11th to 20th	Day	36% 8% 12% 24% 18% 2	2520
	21st to end	Day	40% 8% 14% 20% 14% 4	2520
July	1st to 10th	Day	39% 10% 14% 20% 15% 3	2451
	11th to 20th	Day	32% 8% 15% 26% 18% 2	2445
	21st to end	Day	35% 9% 16% 23% 14% 3	2476
August	1st to 10th	Day	32% 8% 16% 30% 13% 2	2314
	11th to 20th	Day	37% 10% 13% 24% 14% 1	2277
	21st to end	Day	32% 9% 12% 25% 16% 6%	2376
September	1st to 10th	Day	37% 7% 12% 22% 17% 4	2100
	11th to 20th	Day	33% 8% 13% 26% 18% 3	1980
	21st to end	Day	37% 5% 10% 25% 22% 1	1980
October	1st to 10th	Day	39% 5% 11% 25% 18% 3	1980
	11th to 20th	Day	39% 5% 12% 24% 18% 2	1842
	21st to end	Day	52% 3 12% 20% 11% 1	1782
November	1st to 10th	Day	34% 6% 14% 27% 17% 2	1672
	11th to 20th	Day	53% 3 9% 20% 11% 3	1710
	21st to end	Day	55% 5% 10% 20% 8% 2	1710
December	1st to 10th	Day	64% 5% 10% 14% 7% 1	1710
	11th to 20th	Day	62% 4 9% 20% 5%	1987
	21st to end	Day	77% 4 6% 8% 5%	2783
January	1st to 10th	Night	64% 4 7% 15% 9%	2648
	11th to 20th	Night	67% 4 8% 14% 6%	2660
	21st to end	Night	65% 4 10% 14% 8%	2787
February	1st to 10th	Night	63% 4 12% 14% 7% 1	2214
	11th to 20th	Night	55% 4 12% 17% 10% 1	2099
	21st to end	Night	59% 4 10% 16% 9% 2	1776
March	1st to 10th	Night	51% 6% 9% 21% 12% 1	2160
	11th to 20th	Night	46% 6% 13% 22% 11% 3	2016
	21st to end	Night	54% 5% 10% 21% 8% 2	2152
April	1st to 10th	Night	44% 7% 11% 24% 13% 1	1800
	11th to 20th	Night	44% 6% 9% 20% 16% 4	1754
	21st to end	Night	46% 7% 12% 19% 12% 4	1620
May	1st to 10th	Night	54% 7% 10% 18% 9% 2	1620
	11th to 20th	Night	45% 7% 12% 21% 13% 2	1593
	21st to end	Night	34% 10% 16% 23% 14% 4	1736
June	1st to 10th	Night	34% 5% 11% 25% 21% 3	1440
	11th to 20th	Night	31% 7% 13% 26% 19% 4	1440
	21st to end	Night	32% 9% 15% 24% 16% 4	1440
July	1st to 10th	Night	35% 9% 14% 20% 16% 6%	1400
	11th to 20th	Night	27% 8% 14% 30% 19% 2	1392
	21st to end	Night	30% 7% 15% 28% 17% 3	1599
August	1st to 10th	Night	30% 9% 15% 27% 18% 2	1600
	11th to 20th	Night	30% 8% 13% 28% 20% 1	1620
	21st to end	Night	27% 8% 16% 22% 22% 5%	1980
September	1st to 10th	Night	35% 7% 11% 23% 18% 6%	1841
	11th to 20th	Night	29% 6% 10% 28% 26% 2	1980
	21st to end	Night	33% 6% 11% 24% 23% 3	1980
October	1st to 10th	Night	32% 5% 11% 27% 22% 3	1980
	11th to 20th	Night	43% 4 9% 24% 18% 2	2114
	21st to end	Night	47% 5% 9% 22% 14% 2	2574
November	1st to 10th	Night	38% 4 11% 23% 21% 3	2406
	11th to 20th	Night	47% 5% 11% 20% 16% 3	2470
	21st to end	Night	57% 5% 9% 20% 9%	2470
December	1st to 10th	Night	60% 4 10% 16% 9% 1	2470
	11th to 20th	Night	59% 4 10% 19% 7% 1	3205
	21st to end	Night	72% 5% 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	22% 18% 37% 19% 3 1	270
	11th to 20th	Day	22% 20% 39% 15% 4 1	270
	21st to end	Day	29% 18% 32% 15% 5% 1	294
February	1st to 10th	Day	32% 17% 33% 16% 2	240
	11th to 20th	Day	23% 18% 39% 15% 5%	240
	21st to end	Day	24% 19% 42% 12% 2	198
March	1st to 10th	Day	23% 21% 35% 18% 3	240
	11th to 20th	Day	26% 12% 35% 20% 7% 2	384
	21st to end	Day	32% 13% 31% 17% 7%	462
April	1st to 10th	Day	20% 15% 32% 20% 10% 2	420
	11th to 20th	Day	21% 14% 31% 18% 12% 4	412
	21st to end	Day	26% 14% 29% 18% 10% 2	420
May	1st to 10th	Day	23% 12% 31% 24% 8% 3	423
	11th to 20th	Day	22% 5% 31% 23% 12% 7%	447
	21st to end	Day	11% 7% 27% 25% 18% 12%	490
June	1st to 10th	Day	12% 5% 26% 32% 20% 5%	630
	11th to 20th	Day	11% 6% 25% 29% 22% 7%	630
	21st to end	Day	11% 6% 26% 28% 21% 8%	630
July	1st to 10th	Day	12% 2 17% 26% 24% 19%	621
	11th to 20th	Day	6% 3 20% 32% 25% 14%	618
	21st to end	Day	11% 3 15% 30% 26% 15%	563
August	1st to 10th	Day	9% 3 11% 28% 28% 20%	446
	11th to 20th	Day	11% 3 18% 28% 27% 14%	439
	21st to end	Day	9% 3 15% 26% 33% 15%	495
September	1st to 10th	Day	12% 4 15% 26% 31% 12%	450
	11th to 20th	Day	10% 2 13% 28% 30% 17%	450
	21st to end	Day	15% 8% 22% 22% 24% 9%	450
October	1st to 10th	Day	12% 7% 26% 31% 16% 8%	450
	11th to 20th	Day	14% 14% 35% 25% 10% 1	428
	21st to end	Day	30% 13% 38% 18% 1	297
November	1st to 10th	Day	12% 14% 35% 24% 12% 4	270
	11th to 20th	Day	23% 18% 31% 18% 8% 2	270
	21st to end	Day	29% 12% 37% 19% 3	270
December	1st to 10th	Day	20% 22% 35% 16% 7%	270
	11th to 20th	Day	23% 17% 39% 15% 6% 1	270
	21st to end	Day	29% 21% 30% 17% 3	297
January	1st to 10th	Night	22% 17% 35% 21% 5%	950
	11th to 20th	Night	27% 15% 36% 18% 3	950
	21st to end	Night	25% 14% 35% 22% 4	911
February	1st to 10th	Night	29% 9% 36% 23% 3	720
	11th to 20th	Night	22% 13% 37% 26% 2	703
	21st to end	Night	26% 12% 39% 20% 3	592
March	1st to 10th	Night	21% 14% 33% 26% 6%	720
	11th to 20th	Night	21% 10% 37% 26% 6% 1	720
	21st to end	Night	27% 10% 29% 28% 6%	766
April	1st to 10th	Night	16% 11% 37% 29% 6% 1	540
	11th to 20th	Night	20% 11% 30% 28% 9% 1	533
	21st to end	Night	24% 6% 39% 22% 9% 1	540
May	1st to 10th	Night	21% 6% 34% 30% 8% 1	540
	11th to 20th	Night	19% 4 27% 33% 15% 2	531
	21st to end	Night	9% 2 24% 41% 21% 3	584
June	1st to 10th	Night	10% 3 24% 43% 19% 1	540
	11th to 20th	Night	10% 3 24% 39% 24% 1	540
	21st to end	Night	9% 1 24% 37% 27% 1	540
July	1st to 10th	Night	10% 2 14% 34% 34% 5%	525
	11th to 20th	Night	7% 1 14% 41% 31% 5%	522
	21st to end	Night	9% 2 13% 40% 34% 3	591
August	1st to 10th	Night	8% 1 12% 39% 35% 4	537
	11th to 20th	Night	9% 1 11% 40% 32% 7%	534
	21st to end	Night	7% 2 13% 34% 39% 5%	594
September	1st to 10th	Night	14% 4 11% 37% 30% 5%	581
	11th to 20th	Night	11% 2 15% 33% 34% 5%	720
	21st to end	Night	12% 5% 23% 34% 22% 4	720
October	1st to 10th	Night	13% 6% 25% 34% 18% 4	720
	11th to 20th	Night	21% 11% 29% 27% 11% 1	720
	21st to end	Night	22% 11% 34% 26% 7%	792
November	1st to 10th	Night	17% 8% 37% 25% 13% 1	740
	11th to 20th	Night	20% 16% 32% 24% 7% 1	760
	21st to end	Night	25% 12% 31% 23% 8%	760
December	1st to 10th	Night	24% 14% 35% 22% 4	760
	11th to 20th	Night	25% 12% 35% 23% 6%	874
	21st to end	Night	30% 14% 33% 19% 3	1045

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