Conconully
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Conconully clear sky chart from 2005-11-06 to 2024-11-08.

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	8% 9% 3 7% 5% 5% 5% 4 6% 7% 43%	105357
	Night	8% 10% 3 7% 5% 4 4 4 6% 7% 43%	102315
Transparency	Day	35% 7% 13% 23% 16% 6%	105126
	Night	39% 7% 14% 22% 13% 5%	102192
Seeing	Day	12% 16% 32% 26% 12% 2	14467
	Night	12% 6% 27% 36% 17% 2	23437

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	12% 18% 6% 15% 6% 5% 4 3 5% 5% 20%	2539
	11th to 20th	Day	11% 15% 4 12% 6% 4 3 3 4 6% 33%	2516
	21st to end	Day	16% 24% 6% 11% 4 3 3 3 4 6% 19%	2794
February	1st to 10th	Day	7% 14% 4 13% 5% 6% 5% 5% 5% 7% 30%	1605
	11th to 20th	Day	7% 15% 4 8% 5% 4 4 4 6% 7% 35%	1665
	21st to end	Day	6% 13% 5% 12% 7% 5% 4 4 7% 9% 28%	1566
March	1st to 10th	Day	7% 14% 5% 10% 5% 6% 5% 4 5% 6% 32%	3138
	11th to 20th	Day	6% 9% 3 6% 4 4 5% 4 5% 7% 49%	3350
	21st to end	Day	10% 15% 5% 9% 6% 6% 6% 4 6% 6% 27%	4117
April	1st to 10th	Day	9% 12% 4 9% 7% 6% 6% 5% 6% 8% 27%	2280
	11th to 20th	Day	7% 13% 4 9% 6% 5% 5% 5% 7% 7% 31%	2252
	21st to end	Day	8% 12% 3 9% 6% 6% 5% 4 6% 8% 32%	2559
May	1st to 10th	Day	8% 9% 3 7% 5% 5% 4 4 7% 7% 40%	4420
	11th to 20th	Day	7% 8% 3 7% 6% 5% 5% 5% 6% 8% 40%	4377
	21st to end	Day	14% 11% 3 10% 6% 6% 6% 4 5% 7% 27%	4813
June	1st to 10th	Day	15% 9% 3 6% 5% 5% 6% 5% 5% 7% 33%	2660
	11th to 20th	Day	11% 8% 3 8% 6% 7% 7% 5% 6% 6% 33%	2660
	21st to end	Day	7% 6% 2 6% 5% 4 5% 4 6% 7% 47%	2848
July	1st to 10th	Day	3 3 1 3 3 3 3 3 5% 5% 68%	4457
	11th to 20th	Day	3 3 1 3 3 3 3 2 4 4 72%	4420
	21st to end	Day	2 2 1 4 3 3 4 3 5% 5% 69%	4790
August	1st to 10th	Day	2 2 1 3 3 3 4 4 6% 8% 64%	4401
	11th to 20th	Day	2 3 1 4 3 5% 5% 4 6% 8% 58%	4237
	21st to end	Day	4 5% 2 7% 5% 5% 5% 3 4 6% 54%	4190
September	1st to 10th	Day	6% 4 2 5% 4 3 4 3 4 6% 60%	2280
	11th to 20th	Day	7% 6% 3 6% 5% 5% 5% 3 5% 7% 49%	2263
	21st to end	Day	8% 6% 2 6% 4 3 5% 3 5% 6% 51%	2071
October	1st to 10th	Day	5% 4 2 5% 3 5% 5% 4 6% 8% 54%	3180
	11th to 20th	Day	6% 6% 2 6% 5% 7% 7% 5% 7% 8% 43%	3107
	21st to end	Day	8% 9% 3 6% 4 3 7% 5% 6% 8% 41%	3101
November	1st to 10th	Day	13% 12% 3 8% 6% 6% 5% 4 6% 6% 30%	1684
	11th to 20th	Day	12% 13% 3 9% 5% 3 5% 4 5% 6% 35%	1520
	21st to end	Day	9% 12% 5% 10% 5% 5% 5% 4 6% 5% 32%	1520
December	1st to 10th	Day	9% 12% 4 7% 7% 5% 5% 3 6% 6% 35%	1406
	11th to 20th	Day	11% 16% 5% 11% 6% 5% 5% 4 5% 6% 24%	1777
	21st to end	Day	12% 18% 7% 13% 6% 6% 5% 4 6% 4 20%	2794
January	1st to 10th	Night	10% 18% 5% 13% 8% 5% 6% 4 5% 6% 22%	4406
	11th to 20th	Night	11% 15% 5% 9% 5% 4 4 3 6% 8% 31%	4382
	21st to end	Night	15% 21% 5% 13% 6% 4 4 3 5% 6% 19%	4862
February	1st to 10th	Night	10% 14% 4 8% 5% 5% 5% 5% 7% 7% 32%	2571
	11th to 20th	Night	7% 10% 4 8% 6% 5% 4 3 6% 8% 39%	2402
	21st to end	Night	7% 12% 5% 10% 5% 5% 5% 5% 7% 7% 33%	1887
March	1st to 10th	Night	5% 12% 5% 7% 6% 5% 6% 4 7% 8% 35%	3736
	11th to 20th	Night	5% 8% 3 7% 4 4 4 3 4 7% 53%	3627
	21st to end	Night	7% 14% 3 10% 7% 6% 6% 5% 6% 7% 29%	3535
April	1st to 10th	Night	8% 9% 3 10% 6% 6% 6% 4 6% 8% 34%	1900
	11th to 20th	Night	6% 10% 3 8% 5% 5% 5% 4 6% 6% 42%	1879
	21st to end	Night	7% 10% 2 7% 5% 4 5% 4 8% 7% 42%	1620
May	1st to 10th	Night	6% 8% 2 7% 4 5% 5% 4 5% 7% 49%	2540
	11th to 20th	Night	6% 5% 2 4 4 3 4 5% 6% 8% 53%	2516
	21st to end	Night	10% 5% 2 5% 4 4 5% 5% 8% 9% 43%	2762
June	1st to 10th	Night	10% 7% 2 6% 4 6% 6% 4 8% 7% 39%	1520
	11th to 20th	Night	8% 7% 3 6% 5% 5% 4 5% 5% 8% 45%	1511
	21st to end	Night	5% 4 1 4 4 4 4 3 6% 7% 57%	1330
July	1st to 10th	Night	3 2 1 3 2 2 2 3 4 3 76%	2494
	11th to 20th	Night	1 1 1 2 2 1 2 2 4 5% 78%	2540
	21st to end	Night	2 1 1 3 1 2 2 2 4 7% 73%	2762
August	1st to 10th	Night	2 3 2 4 3 3 3 2 5% 6% 68%	2529
	11th to 20th	Night	2 2 1 3 2 4 4 3 7% 9% 64%	2590
	21st to end	Night	6% 3 1 3 4 4 5% 3 5% 7% 60%	3486
September	1st to 10th	Night	4 3 1 4 3 3 4 4 5% 6% 62%	1900
	11th to 20th	Night	7% 4 2 5% 4 3 3 3 6% 6% 57%	1916
	21st to end	Night	7% 5% 2 5% 4 4 4 4 6% 8% 53%	2107
October	1st to 10th	Night	6% 4 1 4 3 3 4 4 7% 8% 57%	3800
	11th to 20th	Night	7% 5% 2 6% 5% 5% 6% 4 6% 8% 46%	3828
	21st to end	Night	11% 7% 2 5% 5% 5% 5% 4 6% 6% 43%	4457
November	1st to 10th	Night	15% 12% 3 6% 4 4 5% 4 6% 7% 34%	2554
	11th to 20th	Night	12% 11% 3 7% 5% 5% 5% 4 5% 7% 36%	2660
	21st to end	Night	9% 14% 4 10% 7% 6% 5% 5% 5% 6% 30%	2660
December	1st to 10th	Night	9% 15% 4 8% 5% 4 4 4 6% 7% 34%	2746
	11th to 20th	Night	11% 17% 5% 11% 6% 5% 5% 4 6% 7% 22%	3438
	21st to end	Night	13% 19% 6% 12% 5% 4 4 3 5% 5% 25%	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	65% 10% 10% 11% 5%	2539
	11th to 20th	Day	54% 9% 15% 15% 3 4	2540
	21st to end	Day	70% 9% 9% 9% 3	2794
February	1st to 10th	Day	49% 12% 18% 16% 5% 1	1605
	11th to 20th	Day	44% 11% 19% 18% 9%	1674
	21st to end	Day	45% 12% 18% 17% 7% 1	1566
March	1st to 10th	Day	46% 8% 15% 19% 11% 2	3138
	11th to 20th	Day	29% 5% 20% 37% 8%	3350
	21st to end	Day	46% 8% 18% 18% 9% 1	4117
April	1st to 10th	Day	44% 9% 16% 22% 7% 2	2280
	11th to 20th	Day	40% 6% 17% 21% 13% 3	2252
	21st to end	Day	39% 8% 14% 22% 12% 3	2559
May	1st to 10th	Day	31% 7% 11% 24% 23% 3	4420
	11th to 20th	Day	27% 8% 16% 33% 14% 2	4380
	21st to end	Day	44% 8% 16% 23% 8% 1	4814
June	1st to 10th	Day	42% 5% 13% 20% 14% 6%	2660
	11th to 20th	Day	39% 6% 16% 22% 13% 3	2660
	21st to end	Day	27% 4 14% 29% 20% 5%	2848
July	1st to 10th	Day	12% 3 8% 19% 31% 27%	4388
	11th to 20th	Day	13% 2 4 13% 27% 39%	4345
	21st to end	Day	13% 2 6% 25% 31% 23%	4639
August	1st to 10th	Day	13% 4 7% 26% 36% 14%	4384
	11th to 20th	Day	17% 4 14% 37% 24% 4	4279
	21st to end	Day	25% 4 13% 30% 21% 6%	4189
September	1st to 10th	Day	19% 5% 13% 29% 27% 7%	2280
	11th to 20th	Day	29% 6% 13% 24% 22% 5%	2263
	21st to end	Day	28% 6% 17% 29% 17% 3	2071
October	1st to 10th	Day	23% 5% 18% 37% 16% 1	3180
	11th to 20th	Day	31% 9% 17% 26% 15% 1	3107
	21st to end	Day	37% 9% 17% 23% 14%	3101
November	1st to 10th	Day	47% 11% 16% 16% 9% 1	1684
	11th to 20th	Day	50% 10% 16% 17% 6% 1	1520
	21st to end	Day	53% 11% 15% 13% 6% 1	1520
December	1st to 10th	Day	52% 12% 14% 17% 5%	1406
	11th to 20th	Day	65% 10% 12% 9% 4	1780
	21st to end	Day	67% 9% 9% 10% 4	2794
January	1st to 10th	Night	65% 11% 11% 10% 3	4406
	11th to 20th	Night	49% 9% 17% 17% 5% 2	4420
	21st to end	Night	75% 7% 9% 6% 3	4862
February	1st to 10th	Night	52% 12% 16% 13% 5% 1	2571
	11th to 20th	Night	43% 11% 18% 20% 8%	2404
	21st to end	Night	44% 12% 16% 17% 9% 1	1887
March	1st to 10th	Night	41% 9% 17% 23% 10% 1	3736
	11th to 20th	Night	29% 5% 20% 34% 10% 1	3628
	21st to end	Night	48% 7% 19% 20% 5%	3535
April	1st to 10th	Night	41% 7% 18% 24% 8% 2	1900
	11th to 20th	Night	36% 6% 15% 23% 16% 4	1879
	21st to end	Night	33% 8% 14% 27% 15% 3	1620
May	1st to 10th	Night	29% 7% 10% 24% 28% 2	2540
	11th to 20th	Night	23% 8% 13% 33% 20% 4	2516
	21st to end	Night	29% 10% 21% 28% 12% 1	2762
June	1st to 10th	Night	35% 7% 13% 23% 18% 4	1520
	11th to 20th	Night	32% 7% 16% 27% 15% 3	1511
	21st to end	Night	21% 5% 15% 30% 23% 5%	1330
July	1st to 10th	Night	11% 3 5% 19% 29% 32%	2454
	11th to 20th	Night	8% 3 5% 15% 26% 42%	2492
	21st to end	Night	9% 3 6% 26% 32% 26%	2674
August	1st to 10th	Night	16% 4 7% 23% 33% 16%	2521
	11th to 20th	Night	14% 4 13% 37% 27% 4	2614
	21st to end	Night	22% 4 13% 32% 24% 6%	3486
September	1st to 10th	Night	18% 4 13% 30% 28% 7%	1900
	11th to 20th	Night	23% 5% 13% 28% 25% 6%	1916
	21st to end	Night	25% 6% 16% 33% 15% 5%	2107
October	1st to 10th	Night	21% 4 16% 38% 18% 2	3800
	11th to 20th	Night	33% 8% 15% 27% 16% 1	3828
	21st to end	Night	38% 7% 15% 28% 11% 1	4457
November	1st to 10th	Night	46% 9% 19% 17% 8% 2	2554
	11th to 20th	Night	46% 12% 18% 15% 6% 2	2660
	21st to end	Night	57% 11% 14% 12% 6%	2660
December	1st to 10th	Night	54% 10% 15% 18% 3	2746
	11th to 20th	Night	68% 9% 10% 9% 4	3434
	21st to end	Night	65% 9% 10% 11% 5% 1	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	16% 16% 31% 19% 13% 6%	180
	11th to 20th	Day	21% 13% 23% 25% 14% 4	180
	21st to end	Day	22% 10% 26% 30% 10% 2	198
February	1st to 10th	Day	10% 15% 46% 22% 6%	265
	11th to 20th	Day	12% 17% 36% 27% 7% 1	365
	21st to end	Day	10% 19% 37% 24% 9% 1	380
March	1st to 10th	Day	16% 18% 37% 19% 8% 1	460
	11th to 20th	Day	15% 22% 27% 21% 15% 1	460
	21st to end	Day	16% 21% 31% 22% 8%	506
April	1st to 10th	Day	21% 20% 31% 19% 7% 1	460
	11th to 20th	Day	16% 26% 28% 19% 8% 3	452
	21st to end	Day	15% 21% 30% 22% 10% 2	460
May	1st to 10th	Day	12% 17% 34% 28% 7% 1	463
	11th to 20th	Day	19% 12% 26% 28% 13% 2	488
	21st to end	Day	15% 14% 27% 27% 13% 3	529
June	1st to 10th	Day	16% 17% 35% 23% 8% 1	490
	11th to 20th	Day	15% 21% 31% 22% 8% 1	490
	21st to end	Day	11% 12% 35% 27% 15% 1	678
July	1st to 10th	Day	5% 12% 35% 35% 12% 1	510
	11th to 20th	Day	7% 16% 35% 28% 13% 3	484
	21st to end	Day	5% 11% 34% 32% 16% 3	531
August	1st to 10th	Day	5% 11% 30% 33% 17% 4	487
	11th to 20th	Day	4 8% 29% 31% 22% 6%	477
	21st to end	Day	8% 14% 32% 29% 13% 4	539
September	1st to 10th	Day	8% 12% 34% 28% 14% 4	490
	11th to 20th	Day	9% 14% 31% 27% 14% 4	490
	21st to end	Day	12% 18% 32% 26% 10% 2	490
October	1st to 10th	Day	11% 15% 36% 22% 16% 1	490
	11th to 20th	Day	11% 18% 31% 25% 12% 3	461
	21st to end	Day	14% 19% 32% 23% 10% 2	330
November	1st to 10th	Day	16% 16% 29% 29% 9% 1	266
	11th to 20th	Day	12% 21% 31% 22% 12% 2	180
	21st to end	Day	13% 13% 32% 26% 13% 3	180
December	1st to 10th	Day	16% 10% 26% 21% 19% 8%	180
	11th to 20th	Day	11% 11% 37% 31% 8% 3	180
	21st to end	Day	11% 9% 32% 34% 12% 2	198
January	1st to 10th	Night	18% 9% 32% 26% 13% 2	760
	11th to 20th	Night	18% 8% 26% 33% 14% 2	760
	21st to end	Night	14% 5% 30% 34% 16% 1	836
February	1st to 10th	Night	14% 7% 34% 34% 10% 2	760
	11th to 20th	Night	11% 7% 31% 35% 14% 1	744
	21st to end	Night	11% 10% 29% 30% 17% 3	628
March	1st to 10th	Night	13% 5% 29% 35% 17% 1	760
	11th to 20th	Night	11% 8% 28% 36% 16% 1	760
	21st to end	Night	10% 7% 30% 39% 13% 1	836
April	1st to 10th	Night	12% 6% 26% 37% 18% 1	760
	11th to 20th	Night	10% 7% 29% 37% 15% 2	751
	21st to end	Night	9% 7% 36% 34% 14%	480
May	1st to 10th	Night	7% 7% 33% 36% 17% 1	380
	11th to 20th	Night	11% 5% 20% 40% 23% 2	374
	21st to end	Night	13% 4 20% 37% 23% 3	411
June	1st to 10th	Night	11% 6% 26% 39% 17% 1	380
	11th to 20th	Night	9% 7% 29% 36% 18% 1	380
	21st to end	Night	5% 4 28% 36% 25% 2	380
July	1st to 10th	Night	5% 5% 19% 41% 28% 1	370
	11th to 20th	Night	2 4 27% 43% 22% 1	368
	21st to end	Night	2 2 20% 44% 31% 1	416
August	1st to 10th	Night	4 4 18% 37% 34% 3	378
	11th to 20th	Night	3 2 19% 36% 36% 4	430
	21st to end	Night	7% 5% 22% 40% 25% 2	824
September	1st to 10th	Night	6% 4 20% 42% 24% 3	760
	11th to 20th	Night	8% 4 18% 31% 31% 7%	760
	21st to end	Night	9% 6% 24% 34% 23% 4	760
October	1st to 10th	Night	12% 6% 21% 36% 24% 2	760
	11th to 20th	Night	10% 5% 27% 38% 17% 3	760
	21st to end	Night	18% 8% 27% 32% 12% 3	836
November	1st to 10th	Night	20% 6% 28% 37% 9%	770
	11th to 20th	Night	16% 10% 28% 32% 13% 2	760
	21st to end	Night	16% 7% 29% 30% 14% 3	760
December	1st to 10th	Night	14% 6% 26% 37% 15% 2	846
	11th to 20th	Night	18% 7% 30% 34% 9% 1	903
	21st to end	Night	19% 8% 27% 37% 7%	836

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