Tanaeum Ridge and Peoh Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tanaeum Ridge and Peoh Point clear sky chart from 2005-11-06 to 2024-11-04.

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	6% 8% 3 8% 5% 5% 5% 4 6% 7% 44%	105326
	Night	6% 9% 3 8% 5% 5% 5% 5% 7% 8% 40%	102292
Transparency	Day	33% 10% 14% 23% 15% 6%	105092
	Night	35% 11% 16% 22% 12% 4	102171
Seeing	Day	17% 19% 34% 20% 7% 2	14403
	Night	14% 17% 30% 26% 11% 2	23345

By Month

Percentage Cloud Cover NW (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	9% 15% 7% 13% 7% 7% 6% 6% 6% 7% 17%	2539
	11th to 20th	Day	9% 17% 5% 10% 6% 5% 4 4 6% 7% 26%	2516
	21st to end	Day	17% 19% 6% 11% 6% 4 5% 5% 6% 6% 15%	2794
February	1st to 10th	Day	8% 11% 5% 12% 9% 6% 5% 5% 7% 7% 26%	1710
	11th to 20th	Day	7% 13% 4 10% 5% 6% 6% 5% 7% 8% 28%	1665
	21st to end	Day	6% 12% 5% 12% 7% 7% 6% 6% 6% 7% 25%	1541
March	1st to 10th	Day	4 10% 4 10% 6% 7% 7% 5% 8% 8% 30%	3138
	11th to 20th	Day	5% 10% 3 9% 6% 5% 4 4 4 5% 46%	3454
	21st to end	Day	8% 13% 5% 10% 9% 7% 6% 5% 7% 7% 23%	4033
April	1st to 10th	Day	8% 13% 3 12% 8% 7% 8% 5% 7% 7% 23%	2280
	11th to 20th	Day	6% 12% 4 10% 7% 5% 6% 5% 6% 7% 32%	2252
	21st to end	Day	5% 10% 4 10% 7% 6% 6% 5% 7% 7% 32%	2496
May	1st to 10th	Day	6% 7% 3 8% 5% 5% 5% 4 6% 7% 44%	4420
	11th to 20th	Day	5% 5% 2 5% 4 4 5% 5% 7% 10% 48%	4377
	21st to end	Day	8% 9% 3 10% 7% 6% 6% 5% 6% 8% 32%	4813
June	1st to 10th	Day	8% 7% 3 8% 7% 5% 5% 4 7% 7% 38%	2660
	11th to 20th	Day	6% 5% 2 6% 6% 7% 6% 6% 8% 9% 40%	2660
	21st to end	Day	4 4 2 5% 4 5% 4 4 6% 8% 54%	2660
July	1st to 10th	Day	1 1 1 2 2 2 3 2 4 5% 77%	4420
	11th to 20th	Day	2 2 1 3 2 2 2 2 3 4 77%	4420
	21st to end	Day	1 2 1 3 2 2 2 2 4 5% 76%	4790
August	1st to 10th	Day	1 1 1 3 2 2 3 3 5% 6% 73%	4401
	11th to 20th	Day	2 2 1 5% 3 3 4 3 6% 8% 64%	4043
	21st to end	Day	5% 5% 2 5% 4 3 4 3 5% 7% 58%	4223
September	1st to 10th	Day	4 2 1 3 3 4 3 3 5% 8% 64%	2280
	11th to 20th	Day	4 4 2 5% 5% 5% 6% 6% 7% 7% 50%	2280
	21st to end	Day	7% 6% 2 7% 4 4 4 3 6% 8% 50%	2034
October	1st to 10th	Day	5% 5% 2 6% 4 3 4 4 6% 10% 52%	3180
	11th to 20th	Day	7% 7% 3 9% 6% 6% 5% 4 6% 9% 38%	3161
	21st to end	Day	8% 9% 4 10% 6% 7% 7% 4 7% 7% 31%	3169
November	1st to 10th	Day	9% 12% 5% 12% 6% 6% 6% 5% 8% 7% 25%	1638
	11th to 20th	Day	8% 14% 4 10% 8% 7% 5% 4 7% 8% 25%	1520
	21st to end	Day	8% 14% 4 9% 7% 6% 6% 5% 7% 6% 28%	1520
December	1st to 10th	Day	8% 14% 4 11% 6% 6% 4 5% 8% 8% 28%	1520
	11th to 20th	Day	9% 13% 5% 13% 7% 6% 7% 5% 8% 7% 19%	1925
	21st to end	Day	9% 15% 6% 16% 9% 5% 5% 4 5% 6% 19%	2794
January	1st to 10th	Night	10% 15% 6% 11% 7% 6% 7% 6% 7% 8% 18%	4406
	11th to 20th	Night	10% 14% 4 10% 5% 5% 5% 5% 6% 10% 26%	4382
	21st to end	Night	12% 20% 6% 12% 7% 6% 5% 5% 6% 6% 16%	4861
February	1st to 10th	Night	7% 12% 5% 9% 6% 5% 6% 5% 8% 10% 27%	2470
	11th to 20th	Night	6% 12% 4 8% 5% 5% 6% 5% 7% 8% 35%	2402
	21st to end	Night	6% 12% 4 11% 7% 6% 6% 5% 7% 7% 29%	1913
March	1st to 10th	Night	5% 8% 3 8% 6% 7% 7% 7% 9% 10% 31%	3736
	11th to 20th	Night	3 7% 3 6% 6% 4 5% 4 6% 6% 50%	3522
	21st to end	Night	6% 9% 4 10% 7% 8% 8% 6% 9% 8% 25%	3619
April	1st to 10th	Night	6% 8% 3 9% 7% 7% 8% 7% 8% 9% 28%	1900
	11th to 20th	Night	4 8% 3 9% 6% 4 6% 5% 7% 8% 39%	1879
	21st to end	Night	5% 8% 3 9% 7% 6% 7% 6% 10% 9% 29%	1679
May	1st to 10th	Night	5% 6% 3 9% 5% 5% 6% 5% 6% 7% 44%	2540
	11th to 20th	Night	5% 4 1 5% 4 6% 5% 6% 6% 8% 52%	2516
	21st to end	Night	3 5% 2 9% 5% 7% 9% 7% 10% 9% 33%	2762
June	1st to 10th	Night	7% 5% 1 9% 6% 5% 6% 5% 7% 8% 42%	1520
	11th to 20th	Night	4 5% 3 6% 7% 5% 6% 5% 8% 11% 39%	1520
	21st to end	Night	2 3 2 5% 4 5% 6% 4 7% 7% 56%	1520
July	1st to 10th	Night	2 1 1 2 2 2 3 3 5% 5% 76%	2540
	11th to 20th	Night	1 1 2 2 2 2 2 3 6% 80%	2540
	21st to end	Night	1 1 1 2 2 2 3 2 4 5% 77%	2762
August	1st to 10th	Night	1 2 1 2 2 2 2 2 4 6% 75%	2529
	11th to 20th	Night	1 2 1 3 3 4 4 4 6% 7% 67%	2780
	21st to end	Night	4 3 1 7% 4 4 4 3 5% 6% 58%	3453
September	1st to 10th	Night	3 2 1 3 3 2 3 3 5% 6% 67%	1900
	11th to 20th	Night	3 4 2 7% 4 5% 5% 4 6% 9% 52%	1900
	21st to end	Night	4 4 3 5% 4 4 4 4 6% 9% 51%	2141
October	1st to 10th	Night	4 5% 2 6% 4 4 4 4 6% 9% 52%	3800
	11th to 20th	Night	6% 5% 2 7% 5% 6% 6% 5% 7% 9% 42%	3777
	21st to end	Night	8% 9% 3 9% 6% 6% 6% 4 6% 9% 32%	4390
November	1st to 10th	Night	11% 11% 3 9% 5% 6% 6% 4 7% 8% 29%	2511
	11th to 20th	Night	8% 11% 4 10% 5% 6% 6% 5% 8% 9% 30%	2660
	21st to end	Night	8% 12% 4 10% 7% 5% 6% 5% 7% 7% 30%	2660
December	1st to 10th	Night	9% 14% 5% 9% 7% 5% 6% 4 7% 8% 27%	2660
	11th to 20th	Night	10% 15% 4 11% 8% 6% 8% 5% 7% 7% 19%	3280
	21st to end	Night	10% 17% 7% 15% 6% 6% 5% 4 6% 7% 17%	4862

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	60% 13% 13% 12% 2	2539
	11th to 20th	Day	53% 9% 16% 17% 4 1	2540
	21st to end	Day	64% 12% 11% 10% 4	2794
February	1st to 10th	Day	51% 14% 16% 14% 4 1	1710
	11th to 20th	Day	46% 14% 16% 17% 8% 1	1674
	21st to end	Day	46% 17% 14% 15% 6% 1	1541
March	1st to 10th	Day	42% 11% 13% 19% 13% 1	3138
	11th to 20th	Day	35% 9% 13% 37% 5%	3454
	21st to end	Day	49% 15% 15% 16% 5%	4033
April	1st to 10th	Day	49% 13% 16% 16% 5%	2280
	11th to 20th	Day	41% 14% 16% 18% 10% 1	2252
	21st to end	Day	38% 17% 14% 19% 10% 1	2496
May	1st to 10th	Day	29% 9% 16% 24% 19% 3	4420
	11th to 20th	Day	23% 9% 24% 31% 13%	4380
	21st to end	Day	39% 16% 21% 20% 4	4814
June	1st to 10th	Day	36% 11% 14% 25% 12% 2	2660
	11th to 20th	Day	27% 13% 20% 26% 12% 2	2660
	21st to end	Day	22% 9% 17% 30% 19% 3	2660
July	1st to 10th	Day	10% 4 8% 18% 28% 32%	4351
	11th to 20th	Day	11% 3 5% 15% 27% 39%	4345
	21st to end	Day	10% 3 7% 26% 39% 15%	4639
August	1st to 10th	Day	10% 4 8% 23% 37% 18%	4384
	11th to 20th	Day	13% 6% 17% 42% 19% 4	4082
	21st to end	Day	24% 5% 14% 27% 26% 3	4222
September	1st to 10th	Day	16% 6% 13% 31% 26% 8%	2280
	11th to 20th	Day	25% 10% 17% 23% 21% 5%	2280
	21st to end	Day	29% 7% 18% 26% 16% 4	2034
October	1st to 10th	Day	22% 8% 13% 41% 16% 1	3180
	11th to 20th	Day	31% 13% 17% 25% 13%	3161
	21st to end	Day	35% 12% 17% 22% 11% 4	3169
November	1st to 10th	Day	49% 13% 13% 18% 7% 1	1638
	11th to 20th	Day	51% 14% 16% 13% 5% 1	1520
	21st to end	Day	47% 13% 15% 16% 7% 1	1520
December	1st to 10th	Day	50% 11% 14% 18% 7%	1520
	11th to 20th	Day	57% 13% 15% 11% 3	1928
	21st to end	Day	62% 11% 9% 13% 5%	2794
January	1st to 10th	Night	57% 13% 16% 10% 4 1	4406
	11th to 20th	Night	47% 10% 17% 19% 5% 1	4420
	21st to end	Night	64% 11% 11% 10% 3 1	4861
February	1st to 10th	Night	46% 14% 18% 17% 5%	2470
	11th to 20th	Night	40% 14% 18% 20% 8% 1	2404
	21st to end	Night	46% 14% 15% 18% 7%	1913
March	1st to 10th	Night	38% 12% 16% 21% 12% 1	3736
	11th to 20th	Night	27% 11% 20% 37% 4	3523
	21st to end	Night	43% 17% 18% 20% 2	3619
April	1st to 10th	Night	38% 17% 20% 19% 6%	1900
	11th to 20th	Night	34% 13% 18% 22% 13% 1	1879
	21st to end	Night	33% 19% 19% 19% 9% 1	1679
May	1st to 10th	Night	29% 12% 14% 26% 18% 1	2540
	11th to 20th	Night	20% 10% 24% 32% 13% 1	2516
	21st to end	Night	26% 22% 26% 21% 4 1	2762
June	1st to 10th	Night	31% 13% 19% 24% 12% 1	1520
	11th to 20th	Night	28% 13% 21% 27% 10% 1	1520
	21st to end	Night	19% 10% 17% 35% 15% 3	1520
July	1st to 10th	Night	7% 5% 10% 22% 25% 31%	2500
	11th to 20th	Night	6% 4 7% 20% 28% 34%	2492
	21st to end	Night	5% 5% 10% 27% 35% 18%	2674
August	1st to 10th	Night	10% 4 8% 23% 40% 15%	2521
	11th to 20th	Night	11% 6% 25% 36% 18% 4	2806
	21st to end	Night	18% 8% 18% 27% 26% 3	3453
September	1st to 10th	Night	14% 7% 14% 29% 29% 6%	1900
	11th to 20th	Night	23% 9% 17% 25% 20% 7%	1900
	21st to end	Night	24% 9% 19% 28% 16% 5%	2141
October	1st to 10th	Night	20% 7% 17% 41% 14% 1	3800
	11th to 20th	Night	27% 12% 19% 28% 13% 1	3777
	21st to end	Night	35% 12% 19% 20% 13% 1	4390
November	1st to 10th	Night	45% 12% 14% 19% 8% 1	2511
	11th to 20th	Night	46% 14% 17% 17% 6% 1	2660
	21st to end	Night	46% 12% 16% 16% 9% 1	2660
December	1st to 10th	Night	52% 12% 13% 18% 5%	2660
	11th to 20th	Night	57% 16% 13% 10% 4	3276
	21st to end	Night	58% 12% 14% 12% 4	4862

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	28% 12% 27% 18% 13% 2	180
	11th to 20th	Day	31% 7% 23% 27% 7% 4	180
	21st to end	Day	20% 13% 31% 25% 9% 2	198
February	1st to 10th	Day	25% 27% 27% 16% 5%	370
	11th to 20th	Day	29% 21% 33% 13% 3	365
	21st to end	Day	24% 20% 34% 16% 5% 1	368
March	1st to 10th	Day	22% 25% 28% 19% 5% 1	460
	11th to 20th	Day	18% 23% 33% 17% 8% 1	460
	21st to end	Day	25% 26% 32% 13% 4	506
April	1st to 10th	Day	27% 24% 28% 16% 4 1	460
	11th to 20th	Day	22% 29% 29% 15% 4 2	452
	21st to end	Day	21% 26% 34% 14% 4 1	460
May	1st to 10th	Day	20% 20% 37% 17% 6% 1	463
	11th to 20th	Day	21% 19% 33% 18% 7% 2	488
	21st to end	Day	16% 20% 34% 23% 7% 1	529
June	1st to 10th	Day	18% 21% 35% 18% 7% 1	490
	11th to 20th	Day	19% 27% 38% 12% 3 1	490
	21st to end	Day	9% 22% 38% 23% 8% 1	490
July	1st to 10th	Day	5% 16% 51% 24% 3	486
	11th to 20th	Day	8% 20% 44% 22% 5% 1	484
	21st to end	Day	5% 15% 45% 24% 9% 2	531
August	1st to 10th	Day	6% 13% 40% 27% 12% 2	487
	11th to 20th	Day	4 12% 38% 30% 12% 4	477
	21st to end	Day	9% 17% 38% 22% 10% 4	539
September	1st to 10th	Day	8% 18% 39% 22% 11% 3	490
	11th to 20th	Day	10% 18% 37% 24% 10% 1	490
	21st to end	Day	14% 18% 34% 22% 9% 2	490
October	1st to 10th	Day	17% 18% 27% 22% 12% 3	490
	11th to 20th	Day	17% 17% 30% 20% 12% 3	490
	21st to end	Day	25% 15% 31% 17% 9% 3	374
November	1st to 10th	Day	29% 15% 28% 21% 6% 1	248
	11th to 20th	Day	27% 13% 29% 18% 9% 3	180
	21st to end	Day	23% 13% 24% 24% 12% 3	180
December	1st to 10th	Day	27% 10% 26% 20% 11% 7%	180
	11th to 20th	Day	20% 18% 32% 22% 7% 2	180
	21st to end	Day	21% 16% 28% 24% 8% 3	198
January	1st to 10th	Night	24% 13% 24% 26% 12% 2	760
	11th to 20th	Night	21% 12% 25% 28% 13% 2	760
	21st to end	Night	19% 12% 25% 29% 13% 2	836
February	1st to 10th	Night	20% 17% 26% 27% 10% 1	760
	11th to 20th	Night	17% 18% 26% 27% 11% 1	744
	21st to end	Night	22% 18% 22% 25% 11% 2	628
March	1st to 10th	Night	16% 15% 26% 31% 11% 1	760
	11th to 20th	Night	14% 16% 28% 29% 12% 1	760
	21st to end	Night	17% 21% 28% 25% 8% 1	836
April	1st to 10th	Night	14% 23% 31% 23% 7% 1	760
	11th to 20th	Night	13% 23% 29% 25% 9% 2	751
	21st to end	Night	12% 27% 36% 17% 8% 1	539
May	1st to 10th	Night	13% 23% 33% 22% 7% 1	380
	11th to 20th	Night	12% 16% 35% 23% 12% 2	374
	21st to end	Night	11% 18% 36% 25% 9%	411
June	1st to 10th	Night	13% 21% 38% 19% 8% 1	380
	11th to 20th	Night	11% 30% 38% 17% 4	380
	21st to end	Night	6% 24% 37% 24% 8% 1	380
July	1st to 10th	Night	5% 17% 50% 22% 6%	370
	11th to 20th	Night	2 24% 48% 20% 5%	368
	21st to end	Night	3 19% 44% 24% 9%	416
August	1st to 10th	Night	3 16% 44% 26% 10% 1	378
	11th to 20th	Night	3 13% 37% 27% 16% 4	544
	21st to end	Night	6% 20% 36% 22% 14% 3	804
September	1st to 10th	Night	5% 17% 34% 26% 15% 3	760
	11th to 20th	Night	8% 15% 28% 27% 17% 5%	760
	21st to end	Night	9% 16% 27% 28% 18% 2	760
October	1st to 10th	Night	12% 15% 25% 28% 18% 2	760
	11th to 20th	Night	14% 11% 25% 30% 16% 4	760
	21st to end	Night	17% 17% 26% 25% 12% 3	836
November	1st to 10th	Night	18% 17% 25% 29% 10%	754
	11th to 20th	Night	21% 14% 25% 25% 13% 2	760
	21st to end	Night	16% 14% 25% 28% 14% 3	760
December	1st to 10th	Night	18% 14% 25% 28% 14% 2	760
	11th to 20th	Night	19% 13% 30% 28% 9% 1	760
	21st to end	Night	22% 18% 25% 28% 6%	836

Page generated at 2024-11-01 19:47:42. Version ac07

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