Doogan's Mountain
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Doogan's Mountain clear sky chart from 2005-11-06 to 2024-02-15.

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% 7% 3 6% 5% 3 5% 5% 6% 7% 38%	78720
	Night	14% 8% 3 5% 5% 3 4 4 5% 7% 42%	80353
Transparency	Day	29% 38% 8% 12% 11% 2	78443
	Night	28% 37% 8% 13% 12% 3	80149
Seeing	Day	18% 14% 24% 21% 16% 7%	13763
	Night	17% 12% 22% 27% 19% 3	23891

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	18% 12% 5% 5% 5% 3 4 4 5% 5% 35%	2836
	11th to 20th	Day	16% 9% 7% 9% 5% 3 3 3 4 4 38%	2840
	21st to end	Day	19% 15% 4 5% 4 2 3 3 4 5% 35%	3234
February	1st to 10th	Day	19% 11% 4 6% 5% 3 3 4 4 6% 35%	1900
	11th to 20th	Day	22% 8% 4 8% 5% 2 3 4 4 6% 33%	1788
	21st to end	Day	23% 10% 3 7% 4 2 4 4 3 5% 35%	1480
March	1st to 10th	Day	16% 9% 3 4 5% 2 4 5% 5% 6% 40%	1822
	11th to 20th	Day	19% 8% 2 6% 7% 3 4 4 5% 6% 35%	1980
	21st to end	Day	15% 10% 3 6% 5% 4 5% 4 5% 7% 36%	2178
April	1st to 10th	Day	11% 7% 2 5% 6% 3 5% 6% 6% 7% 41%	2085
	11th to 20th	Day	14% 6% 3 6% 4 3 4 4 4 7% 44%	2134
	21st to end	Day	13% 7% 4 5% 5% 3 5% 5% 6% 7% 42%	2297
May	1st to 10th	Day	12% 6% 3 5% 6% 2 5% 4 5% 8% 44%	2340
	11th to 20th	Day	13% 5% 4 7% 6% 4 6% 6% 6% 8% 37%	2301
	21st to end	Day	8% 5% 3 8% 5% 4 6% 6% 7% 9% 38%	2531
June	1st to 10th	Day	10% 6% 2 6% 6% 4 6% 7% 8% 10% 35%	2340
	11th to 20th	Day	6% 4 2 6% 6% 3 7% 7% 8% 10% 39%	2340
	21st to end	Day	8% 5% 2 5% 6% 5% 7% 8% 7% 11% 36%	2340
July	1st to 10th	Day	10% 6% 3 7% 7% 5% 7% 6% 9% 10% 30%	2340
	11th to 20th	Day	10% 5% 2 6% 6% 6% 8% 8% 9% 11% 28%	2340
	21st to end	Day	10% 6% 3 7% 7% 5% 7% 9% 9% 10% 27%	2547
August	1st to 10th	Day	8% 4 1 6% 7% 6% 9% 8% 9% 11% 31%	2327
	11th to 20th	Day	11% 6% 3 7% 6% 5% 6% 7% 9% 9% 32%	2159
	21st to end	Day	13% 6% 3 7% 7% 5% 7% 7% 7% 8% 30%	2376
September	1st to 10th	Day	12% 5% 3 5% 7% 3 5% 7% 7% 10% 36%	2019
	11th to 20th	Day	12% 6% 3 7% 6% 4 5% 5% 6% 8% 39%	1980
	21st to end	Day	14% 4 2 5% 5% 3 5% 4 5% 7% 46%	1980
October	1st to 10th	Day	10% 5% 2 4 5% 3 4 3 5% 7% 53%	1980
	11th to 20th	Day	12% 5% 2 4 4 2 4 3 4 6% 53%	1891
	21st to end	Day	14% 5% 2 4 4 2 3 4 5% 5% 52%	1936
November	1st to 10th	Day	13% 5% 1 4 3 3 3 3 4 5% 56%	1672
	11th to 20th	Day	13% 5% 3 5% 4 3 4 3 4 6% 49%	1710
	21st to end	Day	16% 7% 4 5% 4 2 4 4 5% 6% 44%	1710
December	1st to 10th	Day	20% 10% 3 6% 6% 3 4 5% 4 5% 34%	1710
	11th to 20th	Day	16% 10% 3 7% 6% 3 4 3 4 5% 38%	2153
	21st to end	Day	16% 13% 6% 6% 5% 3 4 4 5% 7% 32%	3124
January	1st to 10th	Night	17% 14% 3 6% 5% 3 3 3 4 5% 37%	4109
	11th to 20th	Night	18% 10% 4 5% 5% 3 4 4 5% 5% 38%	4120
	21st to end	Night	21% 14% 3 6% 3 2 4 4 3 4 36%	4406
February	1st to 10th	Night	16% 10% 3 6% 5% 3 4 4 4 6% 40%	2280
	11th to 20th	Night	22% 10% 4 6% 4 3 5% 4 3 4 36%	2153
	21st to end	Night	22% 10% 4 7% 5% 3 4 4 5% 5% 32%	1776
March	1st to 10th	Night	14% 8% 3 5% 4 3 4 5% 5% 6% 42%	2137
	11th to 20th	Night	18% 9% 2 5% 5% 2 5% 4 5% 7% 38%	1980
	21st to end	Night	14% 9% 3 6% 6% 3 4 4 5% 5% 40%	2178
April	1st to 10th	Night	13% 4 2 4 4 2 5% 5% 5% 9% 48%	1889
	11th to 20th	Night	13% 6% 2 5% 4 2 3 4 5% 7% 49%	1775
	21st to end	Night	13% 6% 2 5% 3 2 5% 3 5% 8% 47%	1661
May	1st to 10th	Night	11% 6% 2 5% 4 3 5% 5% 6% 8% 46%	1620
	11th to 20th	Night	12% 6% 3 5% 5% 3 5% 6% 6% 8% 43%	1592
	21st to end	Night	8% 6% 3 6% 5% 3 5% 6% 6% 11% 41%	1744
June	1st to 10th	Night	6% 5% 3 6% 8% 5% 7% 5% 7% 11% 38%	1620
	11th to 20th	Night	5% 2 2 5% 4 4 4 6% 9% 12% 47%	1620
	21st to end	Night	5% 4 2 5% 4 4 6% 6% 7% 11% 45%	1620
July	1st to 10th	Night	9% 5% 3 5% 6% 4 6% 6% 8% 12% 36%	1620
	11th to 20th	Night	8% 4 3 4 6% 4 5% 7% 9% 12% 38%	1620
	21st to end	Night	8% 4 2 5% 5% 4 7% 7% 10% 12% 37%	1771
August	1st to 10th	Night	6% 4 1 5% 5% 4 7% 8% 8% 13% 39%	1611
	11th to 20th	Night	9% 5% 3 6% 5% 3 5% 6% 7% 10% 42%	1738
	21st to end	Night	10% 7% 3 5% 5% 3 5% 6% 7% 11% 38%	1980
September	1st to 10th	Night	10% 4 2 5% 7% 4 4 6% 6% 9% 43%	1921
	11th to 20th	Night	11% 6% 2 5% 4 4 5% 5% 6% 8% 44%	1980
	21st to end	Night	9% 5% 2 5% 4 3 3 5% 6% 8% 50%	1980
October	1st to 10th	Night	11% 4 2 3 4 2 3 3 4 6% 58%	1980
	11th to 20th	Night	14% 5% 2 5% 4 3 4 3 3 4 53%	2066
	21st to end	Night	13% 7% 2 4 3 2 4 3 3 6% 53%	2416
November	1st to 10th	Night	12% 5% 3 4 4 2 3 3 4 6% 55%	2406
	11th to 20th	Night	14% 6% 3 4 4 2 3 3 4 7% 50%	2470
	21st to end	Night	15% 8% 3 5% 5% 3 4 4 4 5% 44%	2470
December	1st to 10th	Night	19% 10% 3 6% 5% 2 5% 4 5% 6% 33%	2470
	11th to 20th	Night	16% 11% 4 5% 5% 2 3 3 4 5% 41%	3042
	21st to end	Night	15% 14% 5% 7% 5% 3 5% 5% 5% 7% 29%	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	38% 28% 5% 11% 17% 1	2837
	11th to 20th	Day	38% 28% 5% 10% 18% 2	2840
	21st to end	Day	43% 24% 6% 12% 13% 1	3234
February	1st to 10th	Day	34% 35% 5% 11% 13% 3	1900
	11th to 20th	Day	34% 37% 4 11% 10% 4	1798
	21st to end	Day	35% 36% 5% 8% 12% 3	1480
March	1st to 10th	Day	27% 37% 6% 11% 15% 4	1822
	11th to 20th	Day	34% 38% 8% 9% 9% 2	1980
	21st to end	Day	33% 39% 7% 14% 7%	2178
April	1st to 10th	Day	23% 40% 8% 14% 11% 3	2085
	11th to 20th	Day	24% 36% 4 12% 20% 4	2134
	21st to end	Day	27% 38% 8% 18% 7% 2	2297
May	1st to 10th	Day	28% 40% 9% 9% 10% 3	2340
	11th to 20th	Day	30% 40% 9% 11% 9% 1	2305
	21st to end	Day	23% 42% 10% 15% 9% 2	2531
June	1st to 10th	Day	25% 42% 11% 15% 7% 1	2340
	11th to 20th	Day	22% 42% 11% 16% 8% 2	2340
	21st to end	Day	23% 43% 11% 11% 10% 2	2340
July	1st to 10th	Day	30% 43% 10% 10% 5% 2	2275
	11th to 20th	Day	28% 45% 11% 7% 7% 3	2271
	21st to end	Day	28% 45% 13% 9% 4	2405
August	1st to 10th	Day	24% 45% 14% 13% 4 1	2314
	11th to 20th	Day	30% 40% 11% 12% 7%	2159
	21st to end	Day	33% 43% 8% 8% 6% 2	2376
September	1st to 10th	Day	29% 40% 9% 10% 9% 3	2019
	11th to 20th	Day	30% 40% 7% 10% 12% 1	1980
	21st to end	Day	25% 39% 7% 10% 15% 5%	1980
October	1st to 10th	Day	19% 38% 6% 12% 21% 5%	1980
	11th to 20th	Day	23% 38% 5% 15% 15% 5%	1891
	21st to end	Day	20% 39% 5% 15% 17% 4	1936
November	1st to 10th	Day	15% 41% 5% 12% 22% 6%	1672
	11th to 20th	Day	23% 41% 5% 12% 15% 4	1710
	21st to end	Day	25% 40% 4 11% 16% 4	1710
December	1st to 10th	Day	31% 41% 4 11% 12% 1	1710
	11th to 20th	Day	33% 35% 7% 10% 14% 2	2150
	21st to end	Day	35% 29% 8% 17% 10% 1	3124
January	1st to 10th	Night	35% 28% 6% 14% 15% 1	4109
	11th to 20th	Night	35% 28% 6% 13% 12% 7%	4120
	21st to end	Night	45% 24% 5% 8% 14% 3	4406
February	1st to 10th	Night	31% 34% 6% 11% 15% 3	2280
	11th to 20th	Night	34% 36% 4 11% 11% 4	2154
	21st to end	Night	36% 37% 3 10% 12% 2	1776
March	1st to 10th	Night	28% 36% 6% 10% 15% 5%	2137
	11th to 20th	Night	30% 39% 7% 12% 10% 2	1980
	21st to end	Night	30% 38% 8% 16% 8% 1	2178
April	1st to 10th	Night	21% 39% 8% 15% 15% 2	1889
	11th to 20th	Night	19% 37% 6% 16% 17% 5%	1775
	21st to end	Night	25% 37% 8% 18% 11% 1	1661
May	1st to 10th	Night	26% 40% 10% 10% 12% 2	1620
	11th to 20th	Night	25% 42% 12% 14% 6% 1	1593
	21st to end	Night	21% 43% 10% 16% 9% 2	1745
June	1st to 10th	Night	25% 41% 11% 14% 8% 1	1620
	11th to 20th	Night	18% 41% 14% 18% 7% 2	1620
	21st to end	Night	21% 41% 14% 9% 11% 4	1620
July	1st to 10th	Night	27% 42% 12% 10% 9% 1	1575
	11th to 20th	Night	23% 43% 14% 10% 7% 3	1566
	21st to end	Night	22% 45% 13% 13% 5%	1672
August	1st to 10th	Night	20% 43% 13% 17% 6% 1	1600
	11th to 20th	Night	26% 41% 13% 11% 9% 1	1738
	21st to end	Night	27% 43% 11% 12% 6% 1	1980
September	1st to 10th	Night	26% 40% 10% 12% 7% 3	1921
	11th to 20th	Night	28% 40% 9% 11% 12% 1	1980
	21st to end	Night	20% 38% 8% 14% 13% 6%	1980
October	1st to 10th	Night	17% 37% 6% 12% 22% 6%	1980
	11th to 20th	Night	24% 37% 5% 13% 15% 5%	2066
	21st to end	Night	21% 38% 4 14% 17% 5%	2416
November	1st to 10th	Night	15% 41% 5% 14% 18% 8%	2406
	11th to 20th	Night	22% 40% 4 12% 17% 5%	2470
	21st to end	Night	26% 40% 4 12% 14% 4	2470
December	1st to 10th	Night	29% 41% 5% 11% 11% 2	2470
	11th to 20th	Night	30% 36% 6% 9% 18% 1	3044
	21st to end	Night	36% 29% 7% 18% 10% 1	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	30% 27% 31% 8% 3	270
	11th to 20th	Day	32% 28% 27% 11% 2	270
	21st to end	Day	28% 29% 34% 7% 1	297
February	1st to 10th	Day	27% 26% 34% 10% 2	270
	11th to 20th	Day	45% 24% 24% 6%	252
	21st to end	Day	39% 27% 28% 7%	198
March	1st to 10th	Day	27% 27% 33% 11% 2	262
	11th to 20th	Day	28% 22% 30% 15% 5%	420
	21st to end	Day	26% 25% 29% 14% 6%	462
April	1st to 10th	Day	23% 19% 28% 19% 10% 1	420
	11th to 20th	Day	21% 21% 27% 20% 9% 2	412
	21st to end	Day	20% 16% 30% 19% 11% 3	420
May	1st to 10th	Day	17% 17% 32% 19% 10% 6%	423
	11th to 20th	Day	14% 11% 27% 27% 14% 8%	447
	21st to end	Day	12% 9% 20% 27% 19% 12%	485
June	1st to 10th	Day	11% 8% 18% 28% 24% 10%	450
	11th to 20th	Day	8% 6% 20% 28% 25% 14%	450
	21st to end	Day	10% 5% 24% 26% 20% 15%	450
July	1st to 10th	Day	11% 5% 15% 24% 25% 20%	445
	11th to 20th	Day	9% 3 13% 26% 28% 21%	444
	21st to end	Day	10% 3 10% 25% 33% 20%	488
August	1st to 10th	Day	11% 4 17% 22% 28% 19%	446
	11th to 20th	Day	11% 5% 15% 28% 29% 12%	439
	21st to end	Day	16% 2 14% 23% 30% 15%	495
September	1st to 10th	Day	13% 3 15% 24% 31% 14%	450
	11th to 20th	Day	14% 6% 14% 25% 29% 12%	450
	21st to end	Day	13% 7% 16% 32% 26% 6%	450
October	1st to 10th	Day	15% 7% 23% 30% 19% 7%	450
	11th to 20th	Day	16% 14% 25% 26% 16% 2	450
	21st to end	Day	18% 14% 27% 25% 15% 2	451
November	1st to 10th	Day	23% 17% 28% 21% 11% 1	270
	11th to 20th	Day	20% 21% 34% 21% 4	270
	21st to end	Day	20% 23% 36% 15% 6% 1	270
December	1st to 10th	Day	29% 24% 30% 13% 3	270
	11th to 20th	Day	27% 20% 31% 17% 5%	270
	21st to end	Day	25% 27% 34% 11% 2	297
January	1st to 10th	Night	25% 24% 27% 20% 4	760
	11th to 20th	Night	26% 21% 26% 21% 5%	760
	21st to end	Night	22% 23% 30% 23% 3	836
February	1st to 10th	Night	21% 18% 31% 26% 4	760
	11th to 20th	Night	30% 21% 30% 17% 2	722
	21st to end	Night	31% 20% 31% 15% 2	592
March	1st to 10th	Night	21% 19% 33% 23% 4	720
	11th to 20th	Night	23% 19% 30% 20% 7% 1	720
	21st to end	Night	22% 17% 28% 24% 8%	792
April	1st to 10th	Night	16% 17% 30% 28% 10%	629
	11th to 20th	Night	15% 17% 30% 27% 10%	533
	21st to end	Night	14% 10% 29% 32% 14%	540
May	1st to 10th	Night	11% 11% 30% 29% 17% 3	540
	11th to 20th	Night	13% 6% 22% 32% 22% 5%	531
	21st to end	Night	10% 3 15% 36% 29% 6%	584
June	1st to 10th	Night	8% 4 15% 35% 34% 4	540
	11th to 20th	Night	4 3 15% 32% 34% 12%	540
	21st to end	Night	6% 1 13% 32% 38% 9%	540
July	1st to 10th	Night	11% 1 8% 28% 42% 10%	525
	11th to 20th	Night	8% 2 8% 27% 42% 13%	522
	21st to end	Night	7% 2 7% 27% 46% 10%	591
August	1st to 10th	Night	9% 2 7% 27% 45% 9%	537
	11th to 20th	Night	9% 2 8% 33% 42% 7%	534
	21st to end	Night	12% 4 8% 29% 39% 8%	594
September	1st to 10th	Night	11% 3 10% 28% 40% 8%	661
	11th to 20th	Night	12% 4 14% 32% 33% 5%	720
	21st to end	Night	12% 5% 16% 32% 32% 2	720
October	1st to 10th	Night	13% 7% 20% 29% 24% 7%	720
	11th to 20th	Night	17% 8% 26% 28% 19% 2	720
	21st to end	Night	17% 11% 22% 32% 16% 2	792
November	1st to 10th	Night	15% 9% 22% 34% 18% 2	740
	11th to 20th	Night	15% 19% 26% 29% 11% 1	760
	21st to end	Night	21% 15% 26% 27% 11%	760
December	1st to 10th	Night	24% 20% 22% 27% 7%	760
	11th to 20th	Night	24% 15% 29% 26% 7%	760
	21st to end	Night	24% 19% 27% 26% 4	836

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