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 2024-03-06.

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% 10% 4 7% 6% 3 5% 5% 5% 7% 33%	78488
	Night	16% 11% 5% 7% 6% 3 4 4 5% 6% 32%	81067
Transparency	Day	50% 7% 12% 19% 11% 1	78192
	Night	52% 6% 12% 18% 11% 1	80884
Seeing	Day	18% 11% 28% 24% 14% 6%	14706
	Night	19% 9% 29% 29% 12% 1	24740

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% 19% 8% 12% 6% 3 4 4 4 5% 18%	2527
	11th to 20th	Day	15% 18% 9% 12% 8% 5% 6% 7% 6% 4 10%	2530
	21st to end	Day	27% 21% 10% 12% 5% 2 3 2 3 4 11%	2827
February	1st to 10th	Day	16% 13% 7% 10% 9% 5% 5% 4 5% 6% 21%	1805
	11th to 20th	Day	15% 12% 6% 12% 9% 4 6% 4 5% 5% 23%	1848
	21st to end	Day	17% 15% 8% 9% 6% 4 4 4 5% 5% 24%	1570
March	1st to 10th	Day	17% 11% 5% 8% 7% 4 5% 4 5% 6% 29%	1850
	11th to 20th	Day	15% 10% 5% 7% 7% 4 4 4 5% 8% 31%	1930
	21st to end	Day	21% 13% 4 8% 6% 4 4 4 5% 5% 26%	2242
April	1st to 10th	Day	19% 12% 4 7% 6% 3 5% 4 5% 6% 30%	2160
	11th to 20th	Day	17% 10% 4 6% 6% 2 5% 4 5% 6% 36%	2169
	21st to end	Day	20% 8% 4 6% 6% 4 4 3 5% 7% 35%	2340
May	1st to 10th	Day	19% 8% 3 7% 6% 3 4 5% 6% 8% 32%	2340
	11th to 20th	Day	19% 8% 3 5% 5% 3 5% 4 5% 7% 35%	2301
	21st to end	Day	12% 5% 3 6% 6% 3 5% 5% 7% 8% 41%	2648
June	1st to 10th	Day	10% 6% 3 6% 4 4 5% 5% 6% 9% 42%	2520
	11th to 20th	Day	10% 5% 2 4 6% 4 5% 5% 6% 9% 44%	2520
	21st to end	Day	12% 5% 3 5% 6% 3 6% 6% 6% 9% 40%	2520
July	1st to 10th	Day	8% 5% 3 5% 6% 4 5% 4 5% 9% 47%	2520
	11th to 20th	Day	9% 5% 2 4 4 3 5% 5% 6% 10% 46%	2520
	21st to end	Day	7% 4 2 5% 6% 4 5% 6% 6% 10% 44%	2711
August	1st to 10th	Day	7% 4 2 5% 5% 3 6% 6% 7% 10% 45%	2327
	11th to 20th	Day	10% 4 2 5% 6% 4 6% 5% 7% 9% 41%	2303
	21st to end	Day	10% 5% 2 4 5% 4 4 5% 6% 8% 47%	2379
September	1st to 10th	Day	12% 6% 3 5% 6% 4 5% 4 5% 8% 43%	2120
	11th to 20th	Day	11% 4 2 4 5% 3 5% 6% 6% 8% 46%	1980
	21st to end	Day	13% 5% 2 5% 5% 3 4 5% 5% 8% 44%	1980
October	1st to 10th	Day	14% 8% 2 5% 6% 3 5% 4 5% 8% 41%	1980
	11th to 20th	Day	18% 8% 3 5% 6% 4 5% 5% 6% 7% 33%	1792
	21st to end	Day	20% 11% 4 6% 7% 4 5% 4 6% 7% 27%	1782
November	1st to 10th	Day	13% 9% 3 7% 5% 3 3 5% 4 7% 41%	1672
	11th to 20th	Day	17% 15% 6% 7% 6% 3 4 3 4 6% 28%	1710
	21st to end	Day	22% 14% 5% 9% 6% 3 4 3 5% 5% 25%	1710
December	1st to 10th	Day	15% 17% 9% 11% 6% 3 4 4 4 5% 22%	1654
	11th to 20th	Day	13% 18% 8% 12% 8% 3 4 5% 5% 5% 20%	1918
	21st to end	Day	22% 21% 8% 13% 8% 2 4 3 3 5% 10%	2783
January	1st to 10th	Night	18% 15% 9% 11% 7% 3 4 4 4 5% 19%	4428
	11th to 20th	Night	16% 18% 9% 13% 8% 3 4 7% 5% 5% 12%	4440
	21st to end	Night	26% 18% 9% 11% 6% 3 3 4 3 4 13%	4824
February	1st to 10th	Night	18% 14% 6% 10% 7% 4 4 5% 4 6% 23%	2371
	11th to 20th	Night	15% 12% 6% 9% 8% 4 5% 4 5% 6% 27%	2218
	21st to end	Night	20% 13% 6% 9% 6% 3 5% 4 4 5% 27%	1884
March	1st to 10th	Night	15% 10% 5% 8% 6% 3 4 4 4 5% 34%	2227
	11th to 20th	Night	14% 9% 3 6% 5% 3 4 4 6% 7% 39%	2030
	21st to end	Night	21% 9% 4 7% 6% 3 3 3 5% 6% 33%	2129
April	1st to 10th	Night	16% 10% 3 4 5% 3 5% 5% 6% 8% 36%	1800
	11th to 20th	Night	19% 8% 3 6% 5% 3 4 5% 5% 6% 37%	1740
	21st to end	Night	18% 9% 3 6% 4 2 4 5% 5% 7% 36%	1620
May	1st to 10th	Night	17% 8% 3 7% 5% 3 4 6% 6% 7% 32%	1620
	11th to 20th	Night	20% 8% 3 4 4 3 4 4 4 7% 39%	1592
	21st to end	Night	10% 6% 2 4 4 3 5% 6% 6% 9% 44%	1624
June	1st to 10th	Night	9% 4 3 5% 4 3 4 4 5% 10% 48%	1440
	11th to 20th	Night	9% 5% 2 5% 5% 3 5% 5% 6% 8% 45%	1440
	21st to end	Night	9% 5% 3 4 6% 3 5% 5% 7% 10% 43%	1440
July	1st to 10th	Night	7% 4 2 4 5% 3 4 5% 6% 10% 51%	1440
	11th to 20th	Night	7% 5% 2 4 4 2 5% 5% 6% 9% 53%	1440
	21st to end	Night	6% 4 2 4 5% 3 5% 6% 6% 9% 51%	1606
August	1st to 10th	Night	7% 4 2 4 4 2 4 5% 7% 11% 48%	1611
	11th to 20th	Night	8% 4 2 4 5% 3 6% 5% 6% 8% 49%	1598
	21st to end	Night	10% 4 2 4 4 3 4 4 5% 8% 52%	1973
September	1st to 10th	Night	11% 5% 2 5% 5% 2 5% 3 5% 6% 50%	1822
	11th to 20th	Night	10% 4 2 3 4 3 3 4 5% 7% 54%	1980
	21st to end	Night	14% 6% 2 5% 4 3 4 4 4 6% 47%	1980
October	1st to 10th	Night	14% 7% 3 4 5% 3 4 3 5% 6% 47%	1980
	11th to 20th	Night	18% 9% 3 7% 6% 2 4 4 4 6% 37%	2165
	21st to end	Night	23% 9% 3 6% 6% 3 4 4 4 5% 34%	2574
November	1st to 10th	Night	13% 10% 4 6% 5% 3 5% 4 4 7% 40%	2406
	11th to 20th	Night	16% 13% 4 7% 6% 3 4 5% 6% 7% 29%	2470
	21st to end	Night	19% 15% 5% 8% 6% 3 4 3 5% 6% 27%	2470
December	1st to 10th	Night	18% 15% 7% 10% 7% 4 5% 4 4 5% 20%	2522
	11th to 20th	Night	16% 16% 8% 10% 8% 4 5% 4 4 5% 21%	3279
	21st to end	Night	27% 19% 7% 9% 6% 3 4 4 5% 5% 12%	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% 7% 12% 11% 3	2528
	11th to 20th	Day	70% 8% 11% 8% 3	2530
	21st to end	Day	80% 3 6% 9% 2	2827
February	1st to 10th	Day	63% 6% 11% 12% 6% 1	1805
	11th to 20th	Day	62% 6% 10% 14% 8%	1858
	21st to end	Day	61% 6% 11% 14% 5% 2	1570
March	1st to 10th	Day	56% 5% 12% 19% 8%	1850
	11th to 20th	Day	51% 6% 13% 18% 10% 2	1930
	21st to end	Day	60% 6% 11% 17% 5% 1	2242
April	1st to 10th	Day	53% 6% 11% 19% 11%	2160
	11th to 20th	Day	49% 7% 11% 20% 11% 2	2169
	21st to end	Day	49% 6% 14% 17% 13% 2	2340
May	1st to 10th	Day	50% 7% 13% 20% 9%	2340
	11th to 20th	Day	48% 7% 11% 19% 13% 1	2305
	21st to end	Day	40% 9% 12% 24% 13% 2	2648
June	1st to 10th	Day	37% 7% 13% 25% 16% 1	2520
	11th to 20th	Day	35% 9% 13% 23% 18% 2	2520
	21st to end	Day	39% 9% 15% 19% 15% 2	2520
July	1st to 10th	Day	35% 7% 13% 23% 18% 4	2451
	11th to 20th	Day	32% 8% 15% 27% 16% 2	2445
	21st to end	Day	32% 9% 15% 24% 16% 3	2560
August	1st to 10th	Day	32% 9% 18% 26% 14% 2	2314
	11th to 20th	Day	36% 9% 15% 23% 15% 1	2303
	21st to end	Day	33% 7% 14% 23% 18% 5%	2379
September	1st to 10th	Day	38% 8% 16% 18% 17% 3	2120
	11th to 20th	Day	33% 7% 13% 28% 18% 1	1980
	21st to end	Day	38% 5% 14% 23% 18% 1	1980
October	1st to 10th	Day	41% 6% 12% 24% 16% 2	1980
	11th to 20th	Day	49% 5% 12% 20% 14%	1792
	21st to end	Day	57% 6% 13% 14% 8% 1	1782
November	1st to 10th	Day	42% 7% 12% 24% 14% 1	1672
	11th to 20th	Day	57% 5% 11% 18% 8% 1	1710
	21st to end	Day	62% 5% 12% 15% 6%	1710
December	1st to 10th	Day	65% 6% 10% 14% 5%	1654
	11th to 20th	Day	63% 9% 13% 13% 2	1915
	21st to end	Day	79% 5% 7% 5% 3	2783
January	1st to 10th	Night	65% 7% 11% 12% 4	4428
	11th to 20th	Night	73% 6% 10% 8% 3	4440
	21st to end	Night	75% 5% 10% 8% 3	4824
February	1st to 10th	Night	62% 6% 12% 13% 6% 1	2371
	11th to 20th	Night	57% 6% 10% 18% 8% 1	2219
	21st to end	Night	59% 5% 12% 15% 7% 2	1884
March	1st to 10th	Night	52% 5% 13% 19% 10% 1	2227
	11th to 20th	Night	44% 6% 13% 21% 13% 2	2030
	21st to end	Night	53% 5% 9% 22% 10% 1	2129
April	1st to 10th	Night	45% 7% 13% 22% 13% 1	1800
	11th to 20th	Night	47% 6% 9% 17% 17% 2	1740
	21st to end	Night	47% 7% 11% 20% 12% 2	1620
May	1st to 10th	Night	50% 8% 11% 19% 10% 2	1620
	11th to 20th	Night	46% 6% 11% 20% 16% 1	1593
	21st to end	Night	35% 9% 17% 22% 14% 2	1625
June	1st to 10th	Night	31% 7% 13% 28% 18% 3	1440
	11th to 20th	Night	35% 8% 14% 22% 19% 2	1440
	21st to end	Night	34% 10% 16% 22% 15% 3	1440
July	1st to 10th	Night	29% 9% 14% 25% 19% 4	1400
	11th to 20th	Night	28% 7% 16% 25% 20% 4	1392
	21st to end	Night	27% 10% 16% 25% 19% 4	1517
August	1st to 10th	Night	28% 8% 14% 30% 19% 1	1600
	11th to 20th	Night	30% 9% 16% 23% 19% 3	1598
	21st to end	Night	31% 7% 11% 25% 22% 5%	1973
September	1st to 10th	Night	34% 7% 13% 23% 19% 5%	1822
	11th to 20th	Night	30% 5% 10% 31% 22% 2	1980
	21st to end	Night	37% 6% 11% 27% 17% 2	1980
October	1st to 10th	Night	38% 5% 11% 27% 18% 1	1980
	11th to 20th	Night	48% 6% 11% 21% 13% 1	2165
	21st to end	Night	52% 5% 11% 20% 11% 1	2574
November	1st to 10th	Night	44% 6% 11% 22% 16% 1	2406
	11th to 20th	Night	52% 7% 14% 18% 8% 1	2470
	21st to end	Night	59% 6% 11% 18% 6%	2470
December	1st to 10th	Night	66% 6% 11% 12% 5%	2522
	11th to 20th	Night	65% 7% 10% 13% 4	3281
	21st to end	Night	73% 7% 11% 7% 2	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	19% 24% 33% 16% 8% 1	270
	11th to 20th	Day	25% 14% 43% 13% 5% 1	270
	21st to end	Day	31% 15% 30% 21% 4	297
February	1st to 10th	Day	25% 17% 34% 18% 5% 1	270
	11th to 20th	Day	24% 20% 32% 20% 4	270
	21st to end	Day	22% 26% 38% 11% 3	225
March	1st to 10th	Day	21% 22% 38% 15% 5%	255
	11th to 20th	Day	24% 12% 33% 22% 7% 1	370
	21st to end	Day	34% 13% 27% 19% 6% 1	462
April	1st to 10th	Day	26% 13% 31% 23% 7% 1	420
	11th to 20th	Day	23% 17% 30% 17% 10% 3	412
	21st to end	Day	24% 15% 30% 19% 10% 3	420
May	1st to 10th	Day	23% 15% 31% 18% 9% 4	423
	11th to 20th	Day	24% 11% 26% 23% 11% 5%	447
	21st to end	Day	15% 6% 26% 25% 20% 8%	602
June	1st to 10th	Day	11% 8% 28% 31% 17% 6%	630
	11th to 20th	Day	14% 6% 25% 30% 19% 6%	630
	21st to end	Day	13% 6% 29% 29% 17% 6%	630
July	1st to 10th	Day	9% 4 19% 30% 24% 14%	621
	11th to 20th	Day	11% 5% 23% 30% 21% 11%	618
	21st to end	Day	7% 3 23% 33% 23% 11%	652
August	1st to 10th	Day	9% 2 17% 30% 25% 18%	446
	11th to 20th	Day	11% 3 20% 29% 28% 9%	439
	21st to end	Day	12% 3 18% 27% 27% 12%	495
September	1st to 10th	Day	13% 7% 21% 27% 22% 10%	450
	11th to 20th	Day	9% 4 19% 24% 31% 13%	450
	21st to end	Day	15% 12% 19% 26% 21% 7%	450
October	1st to 10th	Day	16% 6% 29% 26% 16% 7%	450
	11th to 20th	Day	21% 18% 27% 28% 6%	388
	21st to end	Day	28% 14% 39% 14% 3 1	297
November	1st to 10th	Day	14% 16% 34% 26% 8% 3	270
	11th to 20th	Day	24% 18% 31% 20% 7%	270
	21st to end	Day	30% 12% 37% 17% 3	270
December	1st to 10th	Day	22% 22% 34% 14% 7% 1	270
	11th to 20th	Day	22% 19% 37% 17% 4	270
	21st to end	Day	23% 23% 40% 13% 1	297
January	1st to 10th	Night	22% 15% 36% 22% 5%	950
	11th to 20th	Night	25% 14% 36% 19% 5% 1	950
	21st to end	Night	23% 13% 36% 25% 3	1011
February	1st to 10th	Night	26% 10% 37% 23% 4	760
	11th to 20th	Night	20% 14% 37% 26% 3	743
	21st to end	Night	26% 11% 40% 20% 3	628
March	1st to 10th	Night	20% 12% 35% 24% 7% 1	743
	11th to 20th	Night	19% 9% 39% 25% 7%	720
	21st to end	Night	26% 10% 30% 28% 6% 1	743
April	1st to 10th	Night	19% 12% 35% 26% 7% 1	540
	11th to 20th	Night	22% 10% 34% 27% 6% 1	533
	21st to end	Night	21% 9% 33% 27% 9% 1	540
May	1st to 10th	Night	21% 6% 31% 33% 8% 1	540
	11th to 20th	Night	23% 6% 27% 30% 13%	531
	21st to end	Night	12% 4 24% 38% 20% 1	584
June	1st to 10th	Night	10% 4 26% 45% 15%	540
	11th to 20th	Night	11% 3 26% 41% 19% 1	540
	21st to end	Night	11% 3 22% 39% 24% 1	540
July	1st to 10th	Night	7% 3 17% 40% 29% 5%	525
	11th to 20th	Night	8% 2 18% 40% 28% 3	522
	21st to end	Night	7% 2 15% 42% 32% 2	591
August	1st to 10th	Night	8% 2 12% 45% 29% 5%	537
	11th to 20th	Night	8% 2 14% 42% 30% 4	534
	21st to end	Night	11% 2 16% 33% 34% 4	594
September	1st to 10th	Night	14% 2 18% 36% 27% 4	562
	11th to 20th	Night	10% 5% 16% 37% 28% 4	720
	21st to end	Night	16% 6% 25% 30% 20% 4	720
October	1st to 10th	Night	15% 7% 26% 32% 18% 1	720
	11th to 20th	Night	22% 15% 29% 26% 8% 1	720
	21st to end	Night	26% 13% 31% 23% 6%	792
November	1st to 10th	Night	19% 12% 31% 28% 10% 1	740
	11th to 20th	Night	23% 15% 33% 22% 6% 1	760
	21st to end	Night	26% 13% 32% 25% 4	760
December	1st to 10th	Night	26% 16% 34% 19% 5%	812
	11th to 20th	Night	24% 13% 37% 21% 4	950
	21st to end	Night	31% 14% 35% 18% 2	1045

Page generated at 2024-03-03 06:28:59. Version ac07

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