Indian Pass Penninsula
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Pass Penninsula clear sky chart from 2005-11-06 to 2024-02-10.

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	10% 5% 2 5% 5% 3 5% 5% 6% 9% 44%	78811
	Night	9% 5% 2 5% 5% 3 4 5% 6% 9% 46%	80155
Transparency	Day	24% 38% 10% 13% 11% 4	78540
	Night	24% 36% 9% 13% 12% 5%	79945
Seeing	Day	10% 7% 21% 27% 22% 13%	13864
	Night	10% 5% 18% 28% 29% 10%	23931

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	13% 7% 3 5% 6% 3 5% 5% 5% 8% 42%	2836
	11th to 20th	Day	11% 5% 2 4 5% 3 5% 5% 6% 9% 44%	3045
	21st to end	Day	18% 8% 3 6% 5% 3 4 4 4 6% 38%	3476
February	1st to 10th	Day	16% 5% 2 5% 5% 3 4 4 4 7% 44%	1890
	11th to 20th	Day	14% 4 2 5% 4 3 4 4 5% 7% 50%	1748
	21st to end	Day	14% 6% 2 5% 5% 3 4 4 6% 6% 45%	1480
March	1st to 10th	Day	7% 3 2 5% 4 3 5% 4 6% 9% 53%	1822
	11th to 20th	Day	8% 4 2 5% 4 2 4 4 5% 9% 53%	1980
	21st to end	Day	8% 4 2 3 4 2 4 5% 4 7% 56%	2178
April	1st to 10th	Day	10% 4 2 5% 4 3 5% 4 7% 9% 47%	2052
	11th to 20th	Day	10% 5% 2 6% 5% 4 3 4 5% 7% 50%	2134
	21st to end	Day	6% 3 1 3 4 2 4 4 4 9% 61%	2160
May	1st to 10th	Day	5% 4 1 2 3 1 4 4 5% 8% 63%	2303
	11th to 20th	Day	4 5% 2 5% 4 4 5% 5% 7% 9% 51%	2301
	21st to end	Day	6% 3 2 4 4 3 4 5% 6% 10% 52%	2531
June	1st to 10th	Day	9% 6% 2 6% 6% 3 5% 7% 9% 12% 37%	2340
	11th to 20th	Day	6% 4 2 5% 6% 4 6% 7% 8% 12% 40%	2340
	21st to end	Day	7% 5% 2 6% 7% 4 8% 7% 8% 12% 33%	2340
July	1st to 10th	Day	9% 5% 3 6% 7% 4 7% 9% 10% 12% 29%	2340
	11th to 20th	Day	10% 5% 4 8% 6% 4 7% 8% 10% 11% 28%	2340
	21st to end	Day	5% 5% 3 6% 8% 5% 9% 7% 9% 13% 30%	2449
August	1st to 10th	Day	7% 5% 2 6% 6% 4 7% 9% 9% 14% 31%	2148
	11th to 20th	Day	11% 5% 3 6% 7% 4 7% 7% 10% 12% 27%	2125
	21st to end	Day	9% 7% 2 5% 6% 3 7% 7% 9% 13% 32%	2376
September	1st to 10th	Day	7% 6% 3 6% 7% 4 6% 8% 9% 15% 30%	1994
	11th to 20th	Day	8% 4 3 6% 6% 4 7% 7% 9% 11% 35%	1980
	21st to end	Day	9% 4 2 5% 5% 3 4 6% 7% 9% 45%	1980
October	1st to 10th	Day	7% 5% 2 5% 5% 3 5% 5% 6% 8% 48%	1980
	11th to 20th	Day	6% 2 1 3 3 3 3 4 5% 8% 61%	1980
	21st to end	Day	7% 5% 2 5% 4 3 4 4 5% 6% 54%	2012
November	1st to 10th	Day	8% 3 2 4 4 3 3 4 5% 7% 58%	1744
	11th to 20th	Day	9% 3 3 4 5% 2 3 4 5% 8% 55%	1710
	21st to end	Day	8% 6% 2 4 5% 3 5% 5% 6% 7% 49%	1710
December	1st to 10th	Day	12% 6% 2 5% 5% 3 4 5% 5% 8% 46%	1710
	11th to 20th	Day	14% 7% 3 6% 5% 3 4 5% 4 6% 43%	2153
	21st to end	Day	18% 8% 3 6% 4 3 5% 5% 5% 6% 38%	3124
January	1st to 10th	Night	14% 8% 3 5% 4 3 4 5% 6% 8% 41%	4109
	11th to 20th	Night	11% 7% 3 6% 6% 3 5% 4 6% 8% 42%	3899
	21st to end	Night	17% 9% 3 6% 4 3 4 4 6% 7% 38%	4180
February	1st to 10th	Night	14% 6% 3 4 4 3 4 4 5% 7% 46%	2275
	11th to 20th	Night	13% 6% 3 4 5% 2 4 3 4 6% 50%	2098
	21st to end	Night	13% 7% 3 5% 5% 3 4 4 5% 7% 45%	1776
March	1st to 10th	Night	9% 4 2 4 4 3 4 5% 5% 8% 52%	2137
	11th to 20th	Night	10% 5% 2 4 4 3 5% 4 6% 9% 49%	1980
	21st to end	Night	8% 4 2 4 3 2 3 3 5% 8% 57%	2178
April	1st to 10th	Night	8% 4 2 4 5% 3 4 4 6% 9% 50%	1922
	11th to 20th	Night	9% 4 3 6% 3 3 5% 5% 6% 8% 48%	1775
	21st to end	Night	4 4 2 4 4 3 4 4 5% 8% 59%	1800
May	1st to 10th	Night	4 3 2 3 3 2 3 4 5% 9% 62%	1656
	11th to 20th	Night	5% 4 2 4 4 2 5% 6% 6% 9% 53%	1592
	21st to end	Night	4 3 2 3 4 3 5% 5% 7% 11% 54%	1744
June	1st to 10th	Night	6% 5% 3 6% 5% 4 5% 7% 8% 9% 43%	1620
	11th to 20th	Night	5% 3 2 4 4 3 5% 5% 7% 13% 48%	1620
	21st to end	Night	5% 4 2 5% 5% 3 6% 5% 6% 13% 45%	1620
July	1st to 10th	Night	6% 5% 2 5% 6% 4 5% 6% 8% 12% 42%	1620
	11th to 20th	Night	4 5% 2 5% 6% 4 6% 7% 9% 12% 40%	1620
	21st to end	Night	3 3 3 5% 6% 3 6% 6% 8% 14% 43%	1865
August	1st to 10th	Night	5% 3 2 4 4 4 5% 7% 9% 14% 43%	1790
	11th to 20th	Night	6% 5% 3 5% 5% 4 6% 7% 9% 15% 36%	1776
	21st to end	Night	10% 4 2 5% 5% 4 5% 6% 8% 13% 37%	1980
September	1st to 10th	Night	6% 5% 3 5% 6% 4 6% 7% 8% 13% 38%	1948
	11th to 20th	Night	9% 5% 3 7% 6% 3 6% 6% 8% 11% 36%	1980
	21st to end	Night	7% 4 2 4 5% 3 5% 6% 6% 9% 48%	1980
October	1st to 10th	Night	5% 4 2 4 6% 3 4 6% 6% 9% 50%	1980
	11th to 20th	Night	6% 3 1 4 3 2 3 4 5% 8% 59%	1980
	21st to end	Night	8% 5% 2 4 5% 3 5% 5% 5% 7% 51%	2342
November	1st to 10th	Night	7% 3 2 4 5% 2 4 4 5% 6% 56%	2329
	11th to 20th	Night	10% 4 2 4 4 3 4 4 5% 7% 53%	2470
	21st to end	Night	11% 5% 2 5% 4 3 4 4 5% 6% 49%	2470
December	1st to 10th	Night	11% 5% 2 5% 4 3 4 4 5% 8% 49%	2470
	11th to 20th	Night	14% 6% 2 4 5% 2 4 4 5% 7% 46%	3042
	21st to end	Night	16% 8% 3 6% 6% 3 4 5% 4 5% 38%	4532

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	30% 28% 7% 11% 16% 8%	2837
	11th to 20th	Day	28% 28% 6% 13% 12% 13%	3045
	21st to end	Day	39% 24% 6% 9% 18% 5%	3476
February	1st to 10th	Day	28% 35% 6% 10% 15% 6%	1890
	11th to 20th	Day	26% 38% 6% 10% 12% 8%	1758
	21st to end	Day	24% 39% 7% 11% 14% 4	1480
March	1st to 10th	Day	18% 38% 5% 15% 18% 5%	1822
	11th to 20th	Day	18% 38% 11% 16% 11% 6%	1980
	21st to end	Day	19% 38% 11% 16% 12% 4	2178
April	1st to 10th	Day	21% 39% 9% 13% 12% 6%	2052
	11th to 20th	Day	20% 36% 7% 16% 15% 6%	2134
	21st to end	Day	14% 37% 8% 21% 15% 5%	2160
May	1st to 10th	Day	14% 38% 10% 23% 12% 3	2303
	11th to 20th	Day	19% 41% 13% 13% 12% 1	2305
	21st to end	Day	17% 39% 11% 20% 13% 1	2531
June	1st to 10th	Day	21% 41% 15% 18% 4	2340
	11th to 20th	Day	19% 41% 18% 17% 5%	2340
	21st to end	Day	26% 43% 14% 12% 5% 1	2340
July	1st to 10th	Day	29% 46% 14% 10% 1	2275
	11th to 20th	Day	28% 45% 14% 10% 3	2271
	21st to end	Day	25% 47% 19% 9% 1	2312
August	1st to 10th	Day	24% 45% 16% 13% 3	2136
	11th to 20th	Day	28% 45% 15% 9% 2	2125
	21st to end	Day	29% 44% 13% 8% 5%	2376
September	1st to 10th	Day	25% 44% 15% 10% 4 1	1994
	11th to 20th	Day	28% 44% 13% 8% 5% 1	1980
	21st to end	Day	23% 39% 8% 12% 12% 6%	1980
October	1st to 10th	Day	23% 39% 7% 11% 11% 9%	1980
	11th to 20th	Day	16% 37% 8% 14% 17% 8%	1980
	21st to end	Day	20% 38% 4 11% 18% 9%	2012
November	1st to 10th	Day	12% 42% 6% 13% 15% 12%	1744
	11th to 20th	Day	17% 41% 6% 13% 18% 6%	1710
	21st to end	Day	21% 41% 7% 15% 12% 5%	1710
December	1st to 10th	Day	23% 42% 7% 13% 12% 3	1710
	11th to 20th	Day	32% 33% 7% 8% 12% 8%	2150
	21st to end	Day	34% 28% 6% 13% 15% 4	3124
January	1st to 10th	Night	31% 26% 6% 11% 16% 11%	4109
	11th to 20th	Night	32% 26% 4 14% 16% 8%	3899
	21st to end	Night	37% 25% 7% 10% 15% 6%	4180
February	1st to 10th	Night	25% 35% 5% 10% 16% 8%	2275
	11th to 20th	Night	27% 37% 5% 9% 10% 11%	2099
	21st to end	Night	25% 36% 6% 13% 14% 6%	1776
March	1st to 10th	Night	20% 37% 6% 15% 17% 5%	2137
	11th to 20th	Night	18% 38% 8% 16% 13% 6%	1980
	21st to end	Night	17% 37% 9% 16% 14% 7%	2178
April	1st to 10th	Night	19% 39% 10% 13% 13% 7%	1922
	11th to 20th	Night	22% 37% 6% 15% 15% 6%	1775
	21st to end	Night	14% 37% 6% 21% 16% 6%	1800
May	1st to 10th	Night	14% 38% 10% 19% 16% 4	1656
	11th to 20th	Night	18% 40% 11% 17% 12% 1	1593
	21st to end	Night	16% 38% 11% 17% 15% 2	1745
June	1st to 10th	Night	21% 39% 12% 20% 7%	1620
	11th to 20th	Night	16% 40% 18% 20% 6%	1620
	21st to end	Night	21% 41% 16% 13% 8%	1620
July	1st to 10th	Night	27% 42% 17% 11% 2	1575
	11th to 20th	Night	22% 45% 21% 10% 4	1566
	21st to end	Night	19% 44% 21% 14% 1 1	1761
August	1st to 10th	Night	17% 42% 21% 16% 4	1778
	11th to 20th	Night	24% 43% 19% 13% 2	1776
	21st to end	Night	30% 43% 13% 11% 4	1980
September	1st to 10th	Night	24% 41% 17% 14% 4 1	1948
	11th to 20th	Night	27% 44% 12% 11% 5% 1	1980
	21st to end	Night	22% 39% 10% 10% 14% 4	1980
October	1st to 10th	Night	22% 39% 6% 10% 13% 10%	1980
	11th to 20th	Night	18% 38% 6% 13% 18% 8%	1980
	21st to end	Night	21% 38% 5% 9% 18% 9%	2342
November	1st to 10th	Night	12% 40% 4 14% 16% 13%	2329
	11th to 20th	Night	18% 41% 5% 11% 16% 9%	2470
	21st to end	Night	22% 40% 8% 11% 12% 6%	2470
December	1st to 10th	Night	21% 41% 8% 13% 13% 5%	2470
	11th to 20th	Night	27% 34% 5% 11% 15% 7%	3044
	21st to end	Night	34% 26% 7% 17% 13% 3	4532

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	12% 19% 44% 21% 4	270
	11th to 20th	Day	14% 14% 34% 29% 9%	270
	21st to end	Day	19% 23% 43% 13% 2	297
February	1st to 10th	Day	18% 11% 46% 21% 3	267
	11th to 20th	Day	17% 13% 40% 24% 6%	240
	21st to end	Day	12% 9% 52% 21% 6%	198
March	1st to 10th	Day	11% 13% 45% 27% 4	262
	11th to 20th	Day	13% 11% 33% 28% 12% 1	420
	21st to end	Day	11% 10% 37% 27% 14% 1	462
April	1st to 10th	Day	14% 12% 30% 29% 13% 3	420
	11th to 20th	Day	14% 11% 29% 26% 17% 3	412
	21st to end	Day	8% 7% 29% 33% 19% 3	420
May	1st to 10th	Day	7% 6% 27% 31% 22% 7%	423
	11th to 20th	Day	7% 2 17% 36% 23% 14%	447
	21st to end	Day	7% 2 11% 31% 31% 18%	485
June	1st to 10th	Day	12% 2 9% 32% 24% 20%	450
	11th to 20th	Day	8% 3 10% 24% 29% 26%	450
	21st to end	Day	8% 2 7% 26% 32% 25%	450
July	1st to 10th	Day	9% 4 4 15% 31% 37%	445
	11th to 20th	Day	9% 2 1 15% 36% 37%	444
	21st to end	Day	5% 2 5% 21% 39% 29%	488
August	1st to 10th	Day	9% 2 2 21% 35% 32%	446
	11th to 20th	Day	10% 2 2 14% 39% 33%	439
	21st to end	Day	8% 4 8% 21% 34% 25%	495
September	1st to 10th	Day	8% 3 5% 28% 31% 24%	450
	11th to 20th	Day	10% 2 9% 33% 30% 16%	450
	21st to end	Day	9% 2 10% 29% 35% 16%	450
October	1st to 10th	Day	10% 4 22% 37% 20% 6%	450
	11th to 20th	Day	5% 6% 16% 37% 28% 8%	450
	21st to end	Day	9% 6% 24% 39% 20% 3	495
November	1st to 10th	Day	10% 5% 25% 42% 14% 4	342
	11th to 20th	Day	10% 9% 33% 37% 10% 1	270
	21st to end	Day	11% 9% 37% 31% 10% 2	270
December	1st to 10th	Day	15% 13% 33% 27% 11% 2	270
	11th to 20th	Day	17% 13% 37% 26% 7%	270
	21st to end	Day	18% 10% 35% 27% 8% 1	297
January	1st to 10th	Night	16% 12% 30% 29% 12% 1	760
	11th to 20th	Night	13% 11% 27% 34% 15% 1	760
	21st to end	Night	18% 11% 33% 28% 9% 1	836
February	1st to 10th	Night	17% 10% 27% 32% 13% 1	759
	11th to 20th	Night	15% 8% 31% 31% 14% 1	703
	21st to end	Night	17% 7% 27% 38% 10%	592
March	1st to 10th	Night	12% 6% 27% 41% 15% 1	720
	11th to 20th	Night	11% 6% 25% 33% 23% 1	720
	21st to end	Night	10% 6% 27% 34% 22% 1	792
April	1st to 10th	Night	10% 5% 24% 37% 22% 2	662
	11th to 20th	Night	11% 6% 20% 35% 26% 2	533
	21st to end	Night	6% 4 22% 34% 33% 2	540
May	1st to 10th	Night	5% 4 16% 36% 32% 7%	540
	11th to 20th	Night	7% 2 15% 31% 38% 9%	531
	21st to end	Night	5% 2 6% 26% 50% 11%	584
June	1st to 10th	Night	8% 1 5% 23% 47% 15%	540
	11th to 20th	Night	5% 1 4 19% 44% 25%	540
	21st to end	Night	7% 1 4 14% 49% 25%	540
July	1st to 10th	Night	7% 2 2 11% 43% 35%	525
	11th to 20th	Night	5% 1 2 8% 43% 41%	522
	21st to end	Night	3 1 2 10% 51% 33%	591
August	1st to 10th	Night	5% 1 8% 47% 39%	537
	11th to 20th	Night	5% 1 2 9% 42% 41%	534
	21st to end	Night	10% 2 3 15% 43% 26%	594
September	1st to 10th	Night	7% 2 4 17% 46% 24%	688
	11th to 20th	Night	9% 3 6% 24% 42% 15%	720
	21st to end	Night	9% 1 8% 27% 41% 14%	720
October	1st to 10th	Night	6% 3 18% 34% 31% 7%	720
	11th to 20th	Night	7% 4 14% 33% 35% 7%	720
	21st to end	Night	10% 6% 17% 36% 28% 3	792
November	1st to 10th	Night	8% 5% 19% 41% 24% 3	740
	11th to 20th	Night	11% 7% 25% 32% 23% 2	760
	21st to end	Night	11% 8% 23% 38% 18% 2	760
December	1st to 10th	Night	12% 8% 25% 32% 20% 3	760
	11th to 20th	Night	15% 7% 28% 33% 15% 1	760
	21st to end	Night	18% 8% 27% 32% 15%	836

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