Shipshewana
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shipshewana clear sky chart from 2005-11-06 to 2025-05-26.

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 9% 5% 5% 4 4 5% 7% 33%	113770
	Night	15% 11% 4 9% 5% 4 4 4 5% 6% 32%	115670
Transparency	Day	48% 7% 12% 20% 12% 1	117385
	Night	50% 6% 11% 19% 12% 1	120198
Seeing	Day	18% 11% 28% 23% 14% 5%	16403
	Night	19% 10% 30% 29% 12% 1	26354

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% 17% 10% 23% 5% 4 3 2 3 4 16%	3617
	11th to 20th	Day	13% 15% 8% 14% 10% 7% 6% 5% 6% 4 12%	3620
	21st to end	Day	22% 19% 9% 14% 4 3 3 2 3 4 17%	4052
February	1st to 10th	Day	16% 15% 6% 11% 8% 6% 4 4 5% 5% 21%	1900
	11th to 20th	Day	15% 13% 6% 14% 8% 5% 5% 3 5% 5% 22%	1948
	21st to end	Day	16% 16% 6% 11% 5% 4 4 3 5% 5% 24%	1650
March	1st to 10th	Day	17% 12% 6% 12% 5% 4 4 2 4 5% 29%	4480
	11th to 20th	Day	11% 10% 5% 8% 4 4 4 4 6% 8% 36%	4860
	21st to end	Day	17% 16% 7% 11% 6% 5% 5% 3 5% 5% 21%	5637
April	1st to 10th	Day	18% 13% 4 9% 5% 4 5% 3 5% 6% 30%	2400
	11th to 20th	Day	16% 10% 3 7% 5% 4 4 4 5% 6% 36%	2413
	21st to end	Day	19% 8% 3 7% 5% 4 4 3 5% 7% 36%	2600
May	1st to 10th	Day	19% 8% 2 7% 5% 4 4 4 5% 8% 33%	4212
	11th to 20th	Day	14% 8% 2 6% 4 5% 4 3 6% 8% 38%	4211
	21st to end	Day	10% 6% 2 6% 4 5% 4 4 6% 8% 44%	4758
June	1st to 10th	Day	10% 7% 2 6% 4 5% 5% 4 6% 8% 42%	2660
	11th to 20th	Day	10% 5% 1 5% 5% 5% 5% 4 6% 9% 44%	2660
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 5% 6% 9% 40%	2660
July	1st to 10th	Day	12% 6% 3 7% 5% 5% 5% 3 7% 9% 37%	4440
	11th to 20th	Day	8% 4 2 5% 3 4 4 4 7% 11% 47%	4440
	21st to end	Day	6% 6% 2 7% 5% 6% 5% 5% 6% 9% 42%	4755
August	1st to 10th	Day	9% 5% 2 6% 4 4 5% 4 6% 9% 46%	4104
	11th to 20th	Day	10% 6% 2 5% 4 4 5% 4 6% 8% 45%	4044
	21st to end	Day	7% 5% 2 6% 4 5% 5% 5% 5% 9% 47%	4183
September	1st to 10th	Day	11% 6% 3 5% 5% 5% 4 3 6% 8% 45%	2237
	11th to 20th	Day	11% 4 1 5% 4 3 5% 4 6% 8% 48%	2090
	21st to end	Day	14% 6% 2 6% 4 4 4 3 6% 8% 42%	2090
October	1st to 10th	Day	13% 8% 2 6% 4 4 4 3 5% 8% 43%	2090
	11th to 20th	Day	18% 9% 3 6% 5% 4 5% 4 6% 6% 34%	1891
	21st to end	Day	20% 11% 3 7% 6% 6% 4 3 6% 7% 27%	1881
November	1st to 10th	Day	12% 10% 3 7% 5% 3 4 5% 4 7% 41%	1762
	11th to 20th	Day	16% 17% 5% 8% 5% 4 4 2 4 6% 28%	1800
	21st to end	Day	22% 15% 5% 10% 5% 4 4 3 5% 5% 24%	1800
December	1st to 10th	Day	10% 16% 7% 15% 6% 4 4 3 4 5% 25%	2835
	11th to 20th	Day	16% 20% 10% 14% 6% 5% 4 3 4 4 16%	3008
	21st to end	Day	26% 20% 8% 14% 6% 3 4 2 3 4 10%	3982
January	1st to 10th	Night	14% 17% 8% 19% 6% 4 4 2 4 5% 17%	6348
	11th to 20th	Night	14% 18% 8% 17% 8% 6% 5% 5% 5% 5% 11%	6360
	21st to end	Night	20% 15% 7% 12% 6% 5% 4 3 4 4 21%	6908
February	1st to 10th	Night	18% 15% 5% 11% 7% 5% 4 4 4 6% 23%	2495
	11th to 20th	Night	15% 13% 5% 11% 7% 5% 4 3 4 6% 26%	2338
	21st to end	Night	19% 13% 5% 10% 5% 4 4 3 4 5% 28%	1980
March	1st to 10th	Night	15% 11% 5% 9% 5% 4 4 3 4 7% 34%	5373
	11th to 20th	Night	11% 8% 3 7% 5% 4 4 4 5% 7% 42%	5100
	21st to end	Night	18% 11% 4 10% 5% 4 4 3 5% 6% 31%	5335
April	1st to 10th	Night	16% 11% 2 5% 5% 5% 4 4 5% 7% 36%	2000
	11th to 20th	Night	18% 8% 3 7% 4 4 5% 3 5% 5% 37%	1935
	21st to end	Night	17% 9% 3 7% 4 3 4 4 5% 7% 37%	1800
May	1st to 10th	Night	16% 8% 3 8% 5% 5% 5% 5% 6% 8% 33%	2903
	11th to 20th	Night	18% 9% 2 5% 3 3 3 3 4 7% 41%	2902
	21st to end	Night	13% 6% 3 6% 4 4 4 4 5% 7% 44%	2917
June	1st to 10th	Night	9% 5% 2 6% 3 3 4 3 6% 10% 48%	1520
	11th to 20th	Night	9% 6% 2 6% 5% 4 5% 4 6% 8% 44%	1520
	21st to end	Night	9% 6% 2 5% 5% 4 5% 5% 7% 9% 43%	1520
July	1st to 10th	Night	9% 4 2 5% 5% 4 4 4 6% 11% 45%	2530
	11th to 20th	Night	6% 4 2 5% 3 3 4 4 6% 8% 56%	2530
	21st to end	Night	7% 6% 2 6% 5% 4 5% 5% 8% 9% 45%	2805
August	1st to 10th	Night	11% 6% 2 6% 4 3 4 5% 6% 9% 43%	2825
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 4 5% 8% 48%	2785
	21st to end	Night	10% 6% 3 6% 3 4 4 3 5% 8% 49%	3469
September	1st to 10th	Night	10% 5% 2 5% 4 3 4 3 5% 5% 52%	1924
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 5% 7% 56%	2090
	21st to end	Night	15% 7% 2 6% 4 4 3 3 4 6% 45%	2090
October	1st to 10th	Night	13% 7% 2 5% 4 3 4 3 5% 6% 48%	2090
	11th to 20th	Night	18% 10% 3 8% 5% 3 3 3 4 6% 38%	2286
	21st to end	Night	22% 9% 3 7% 5% 4 4 3 5% 5% 35%	2717
November	1st to 10th	Night	13% 11% 4 6% 4 4 4 4 5% 7% 40%	2536
	11th to 20th	Night	16% 14% 4 8% 5% 4 3 4 6% 7% 29%	2600
	21st to end	Night	18% 17% 4 9% 5% 4 3 3 6% 6% 25%	2600
December	1st to 10th	Night	13% 14% 6% 15% 7% 5% 5% 4 5% 6% 21%	4344
	11th to 20th	Night	16% 19% 9% 13% 7% 5% 4 3 3 4 16%	5199
	21st to end	Night	27% 19% 7% 11% 5% 4 4 4 4 5% 11%	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	72% 6% 10% 10% 2	3618
	11th to 20th	Day	71% 7% 9% 6% 7%	3620
	21st to end	Day	72% 3 7% 12% 5%	4052
February	1st to 10th	Day	64% 6% 11% 12% 6% 1	1900
	11th to 20th	Day	63% 6% 10% 13% 7%	1958
	21st to end	Day	61% 6% 11% 14% 6% 2	1650
March	1st to 10th	Day	57% 6% 10% 19% 8%	4480
	11th to 20th	Day	43% 7% 16% 27% 7% 1	4860
	21st to end	Day	64% 7% 10% 14% 6%	5639
April	1st to 10th	Day	54% 6% 11% 18% 11%	2400
	11th to 20th	Day	48% 7% 11% 21% 11% 2	2413
	21st to end	Day	48% 6% 13% 19% 12% 2	2600
May	1st to 10th	Day	46% 10% 14% 21% 10%	4250
	11th to 20th	Day	41% 9% 16% 24% 10% 1	4215
	21st to end	Day	33% 10% 12% 21% 22% 1	4771
June	1st to 10th	Day	37% 7% 13% 25% 17% 1	2660
	11th to 20th	Day	34% 9% 13% 23% 19% 2	2660
	21st to end	Day	39% 9% 15% 19% 15% 2	2660
July	1st to 10th	Day	43% 6% 14% 19% 16% 3	4371
	11th to 20th	Day	29% 7% 16% 31% 16% 1	4365
	21st to end	Day	36% 10% 15% 17% 20% 3	4605
August	1st to 10th	Day	34% 7% 16% 26% 16% 1	4091
	11th to 20th	Day	34% 8% 13% 28% 16% 1	4083
	21st to end	Day	32% 7% 13% 28% 17% 3	4182
September	1st to 10th	Day	36% 8% 16% 20% 18% 3	2237
	11th to 20th	Day	32% 7% 12% 27% 21% 2	2090
	21st to end	Day	39% 5% 14% 23% 17% 1	2090
October	1st to 10th	Day	29% 4 10% 37% 19% 1	3480
	11th to 20th	Day	41% 5% 11% 21% 23%	3120
	21st to end	Day	46% 5% 12% 23% 11% 2	3081
November	1st to 10th	Day	42% 7% 12% 25% 14% 1	1762
	11th to 20th	Day	58% 5% 11% 17% 8% 1	1800
	21st to end	Day	63% 5% 11% 16% 5%	1800
December	1st to 10th	Day	61% 6% 14% 16% 3	2835
	11th to 20th	Day	70% 7% 9% 12% 2	3005
	21st to end	Day	80% 4 6% 7% 3	3982
January	1st to 10th	Night	69% 6% 8% 13% 3	6348
	11th to 20th	Night	74% 6% 9% 7% 4	6360
	21st to end	Night	66% 5% 13% 10% 7%	6908
February	1st to 10th	Night	62% 6% 12% 13% 7% 1	2495
	11th to 20th	Night	59% 5% 10% 18% 8% 1	2339
	21st to end	Night	59% 5% 13% 15% 7% 1	1980
March	1st to 10th	Night	50% 5% 12% 25% 7% 1	5373
	11th to 20th	Night	39% 7% 13% 28% 11% 2	5100
	21st to end	Night	51% 6% 11% 19% 11% 1	5335
April	1st to 10th	Night	46% 6% 12% 21% 13% 1	2000
	11th to 20th	Night	47% 6% 10% 17% 17% 2	1935
	21st to end	Night	46% 7% 11% 21% 13% 2	1800
May	1st to 10th	Night	46% 9% 12% 20% 11% 1	2930
	11th to 20th	Night	42% 7% 12% 26% 12% 1	2903
	21st to end	Night	35% 9% 15% 18% 21% 2	2925
June	1st to 10th	Night	31% 7% 13% 28% 18% 3	1520
	11th to 20th	Night	35% 8% 13% 23% 19% 2	1520
	21st to end	Night	35% 10% 16% 21% 16% 3	1520
July	1st to 10th	Night	33% 8% 14% 25% 15% 6%	2490
	11th to 20th	Night	25% 6% 16% 27% 23% 3	2482
	21st to end	Night	32% 8% 15% 17% 24% 3	2716
August	1st to 10th	Night	35% 8% 14% 28% 14% 1	2814
	11th to 20th	Night	32% 7% 13% 29% 17% 1	2812
	21st to end	Night	33% 7% 10% 29% 19% 3	3469
September	1st to 10th	Night	32% 7% 12% 23% 21% 5%	1924
	11th to 20th	Night	28% 5% 10% 31% 24% 2	2090
	21st to end	Night	39% 6% 10% 27% 17% 1	2090
October	1st to 10th	Night	24% 4 9% 34% 28% 1	3480
	11th to 20th	Night	39% 4 10% 23% 23% 1	3796
	21st to end	Night	39% 4 10% 29% 18%	4467
November	1st to 10th	Night	44% 6% 11% 23% 15% 1	2536
	11th to 20th	Night	52% 7% 14% 17% 8% 2	2600
	21st to end	Night	60% 6% 11% 18% 6%	2600
December	1st to 10th	Night	61% 7% 15% 14% 3	4344
	11th to 20th	Night	71% 6% 9% 10% 3	5201
	21st to end	Night	75% 6% 9% 7% 2	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	17% 24% 34% 16% 8% 1	300
	11th to 20th	Day	23% 17% 43% 12% 4 1	300
	21st to end	Day	30% 17% 31% 19% 3	330
February	1st to 10th	Day	26% 18% 35% 16% 4 1	300
	11th to 20th	Day	25% 21% 32% 18% 4	300
	21st to end	Day	23% 25% 38% 11% 3	249
March	1st to 10th	Day	21% 22% 40% 13% 4	300
	11th to 20th	Day	25% 14% 32% 22% 6% 1	445
	21st to end	Day	32% 15% 28% 19% 6% 1	550
April	1st to 10th	Day	26% 15% 31% 22% 6% 1	500
	11th to 20th	Day	23% 19% 30% 16% 9% 3	492
	21st to end	Day	24% 14% 30% 20% 9% 2	500
May	1st to 10th	Day	23% 15% 31% 18% 9% 3	503
	11th to 20th	Day	23% 10% 27% 22% 12% 5%	527
	21st to end	Day	15% 7% 27% 26% 19% 7%	675
June	1st to 10th	Day	10% 10% 28% 31% 16% 5%	680
	11th to 20th	Day	14% 6% 27% 30% 18% 5%	680
	21st to end	Day	13% 7% 30% 28% 17% 6%	680
July	1st to 10th	Day	10% 4 20% 30% 23% 13%	671
	11th to 20th	Day	11% 4 23% 30% 21% 11%	668
	21st to end	Day	7% 3 23% 32% 23% 11%	705
August	1st to 10th	Day	9% 2 18% 29% 25% 17%	486
	11th to 20th	Day	11% 3 20% 30% 27% 9%	479
	21st to end	Day	11% 3 17% 28% 28% 12%	539
September	1st to 10th	Day	12% 7% 22% 26% 23% 10%	490
	11th to 20th	Day	8% 4 18% 24% 32% 14%	490
	21st to end	Day	17% 12% 19% 25% 20% 7%	490
October	1st to 10th	Day	15% 6% 29% 27% 16% 6%	490
	11th to 20th	Day	20% 17% 26% 28% 8% 1	424
	21st to end	Day	27% 15% 38% 15% 5% 1	330
November	1st to 10th	Day	15% 17% 34% 25% 7% 3	300
	11th to 20th	Day	23% 20% 32% 18% 7%	300
	21st to end	Day	31% 12% 37% 16% 3	300
December	1st to 10th	Day	21% 22% 34% 15% 6% 1	300
	11th to 20th	Day	23% 20% 37% 17% 3	300
	21st to end	Day	26% 22% 38% 12% 2	330
January	1st to 10th	Night	22% 15% 36% 22% 4	1000
	11th to 20th	Night	25% 14% 37% 19% 4 1	1000
	21st to end	Night	22% 14% 36% 25% 3	1064
February	1st to 10th	Night	26% 11% 38% 22% 3	800
	11th to 20th	Night	21% 14% 37% 25% 3	783
	21st to end	Night	26% 11% 40% 20% 3	660
March	1st to 10th	Night	21% 12% 35% 24% 7% 1	800
	11th to 20th	Night	18% 11% 40% 24% 6%	800
	21st to end	Night	26% 11% 30% 29% 5%	825
April	1st to 10th	Night	20% 13% 35% 26% 6% 1	600
	11th to 20th	Night	23% 11% 34% 26% 6% 1	593
	21st to end	Night	20% 10% 34% 27% 9% 1	600
May	1st to 10th	Night	21% 6% 31% 34% 7% 1	600
	11th to 20th	Night	21% 7% 27% 31% 13%	591
	21st to end	Night	13% 5% 25% 38% 18% 1	634
June	1st to 10th	Night	10% 4 26% 45% 15%	570
	11th to 20th	Night	10% 3 27% 40% 18% 1	570
	21st to end	Night	11% 3 23% 38% 23% 2	570
July	1st to 10th	Night	7% 3 17% 41% 28% 4	555
	11th to 20th	Night	8% 2 18% 40% 28% 3	552
	21st to end	Night	7% 2 15% 43% 32% 2	624
August	1st to 10th	Night	8% 3 12% 45% 28% 5%	567
	11th to 20th	Night	9% 2 14% 43% 29% 4	564
	21st to end	Night	11% 2 16% 33% 34% 4	627
September	1st to 10th	Night	13% 2 18% 37% 27% 3	594
	11th to 20th	Night	9% 4 16% 38% 28% 4	760
	21st to end	Night	17% 6% 24% 30% 19% 4	760
October	1st to 10th	Night	14% 7% 26% 33% 18% 2	760
	11th to 20th	Night	21% 15% 29% 26% 9% 1	760
	21st to end	Night	25% 13% 31% 24% 7%	836
November	1st to 10th	Night	19% 12% 31% 27% 10% 1	780
	11th to 20th	Night	23% 15% 34% 22% 5% 1	800
	21st to end	Night	26% 14% 32% 25% 4	800
December	1st to 10th	Night	26% 16% 34% 19% 5%	855
	11th to 20th	Night	25% 13% 37% 21% 4	1000
	21st to end	Night	31% 14% 34% 18% 3	1100

Page generated at 2025-05-23 09:21:03. Version ac07

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