Dogpound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dogpound clear sky chart from 2005-11-06 to 2025-04-26.

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% 10% 4 8% 5% 5% 5% 4 7% 8% 36%	117095
	Night	6% 10% 4 9% 6% 5% 5% 4 6% 8% 36%	120235
Transparency	Day	43% 7% 15% 23% 10% 2	116842
	Night	43% 7% 15% 22% 11% 2	120134
Seeing	Day	14% 9% 29% 29% 15% 4	15846
	Night	11% 7% 33% 34% 13% 1	25099

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	1 9% 6% 13% 7% 8% 5% 4 5% 8% 33%	3179
	11th to 20th	Day	2 10% 4 11% 6% 6% 6% 5% 7% 7% 36%	3228
	21st to end	Day	3 6% 3 8% 5% 4 5% 4 6% 11% 43%	4004
February	1st to 10th	Day	3 11% 5% 12% 8% 6% 6% 5% 7% 8% 29%	1600
	11th to 20th	Day	4 12% 4 11% 8% 6% 6% 6% 7% 7% 31%	1715
	21st to end	Day	4 11% 5% 11% 7% 6% 6% 4 7% 8% 31%	1616
March	1st to 10th	Day	2 9% 4 11% 5% 5% 5% 4 7% 11% 36%	4518
	11th to 20th	Day	5% 10% 5% 9% 4 4 5% 4 6% 9% 38%	4906
	21st to end	Day	7% 22% 7% 12% 5% 5% 5% 4 6% 6% 21%	5614
April	1st to 10th	Day	8% 16% 5% 11% 7% 5% 5% 4 6% 8% 24%	2445
	11th to 20th	Day	11% 18% 5% 9% 5% 4 4 4 6% 8% 27%	2570
	21st to end	Day	12% 13% 4 9% 5% 5% 5% 4 6% 8% 30%	2537
May	1st to 10th	Day	16% 17% 4 9% 5% 4 4 4 5% 5% 27%	4380
	11th to 20th	Day	11% 10% 4 10% 6% 6% 5% 5% 7% 8% 28%	4694
	21st to end	Day	18% 12% 4 12% 8% 6% 6% 4 6% 5% 20%	5161
June	1st to 10th	Day	18% 8% 3 8% 6% 7% 5% 5% 7% 7% 26%	2850
	11th to 20th	Day	22% 10% 3 9% 6% 6% 6% 5% 6% 6% 22%	2850
	21st to end	Day	11% 6% 2 7% 6% 5% 7% 4 8% 9% 35%	2850
July	1st to 10th	Day	9% 5% 2 7% 5% 5% 6% 4 8% 9% 42%	4740
	11th to 20th	Day	9% 4 2 4 3 4 6% 5% 8% 8% 47%	4740
	21st to end	Day	5% 4 2 6% 4 4 4 4 7% 9% 50%	5018
August	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 5% 7% 8% 41%	4401
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 5% 9% 10% 40%	4115
	21st to end	Day	10% 5% 2 5% 3 3 4 4 7% 8% 49%	4521
September	1st to 10th	Day	12% 7% 2 6% 4 4 4 3 5% 7% 46%	2356
	11th to 20th	Day	15% 8% 2 5% 4 4 5% 3 5% 6% 42%	2092
	21st to end	Day	10% 8% 3 6% 5% 4 5% 4 6% 7% 42%	2090
October	1st to 10th	Day	8% 7% 3 6% 4 4 5% 4 8% 10% 42%	3369
	11th to 20th	Day	6% 6% 2 8% 5% 5% 6% 5% 9% 11% 38%	2876
	21st to end	Day	7% 9% 3 6% 5% 5% 5% 3 6% 7% 44%	3101
November	1st to 10th	Day	7% 15% 5% 8% 5% 5% 5% 5% 5% 7% 33%	1642
	11th to 20th	Day	4 12% 4 10% 6% 5% 4 5% 6% 7% 38%	1487
	21st to end	Day	4 14% 4 9% 6% 5% 4 3 7% 9% 35%	1400
December	1st to 10th	Day	3 11% 4 11% 6% 6% 7% 6% 8% 7% 31%	2290
	11th to 20th	Day	3 9% 4 12% 6% 6% 5% 5% 7% 9% 34%	2642
	21st to end	Day	3 11% 5% 9% 5% 5% 4 5% 6% 7% 42%	3498
January	1st to 10th	Night	2 11% 6% 14% 9% 6% 6% 5% 6% 8% 25%	6766
	11th to 20th	Night	2 10% 4 13% 7% 6% 6% 6% 6% 7% 34%	6712
	21st to end	Night	2 10% 4 10% 5% 5% 5% 4 7% 9% 39%	6952
February	1st to 10th	Night	5% 10% 4 11% 8% 7% 6% 4 6% 7% 30%	2800
	11th to 20th	Night	3 12% 5% 11% 6% 7% 6% 5% 8% 8% 29%	2571
	21st to end	Night	2 11% 4 12% 7% 6% 5% 5% 6% 7% 35%	2010
March	1st to 10th	Night	2 9% 4 12% 6% 6% 6% 4 8% 9% 34%	5376
	11th to 20th	Night	4 8% 4 10% 6% 5% 6% 5% 8% 9% 36%	5093
	21st to end	Night	7% 18% 6% 12% 6% 6% 6% 4 6% 7% 23%	5358
April	1st to 10th	Night	7% 15% 4 9% 6% 5% 5% 5% 6% 7% 31%	1955
	11th to 20th	Night	9% 15% 5% 11% 6% 5% 5% 3 5% 7% 30%	1781
	21st to end	Night	10% 12% 3 9% 6% 5% 6% 5% 7% 7% 30%	1759
May	1st to 10th	Night	18% 16% 4 8% 4 4 4 3 5% 5% 29%	2579
	11th to 20th	Night	9% 8% 4 9% 6% 5% 5% 4 7% 10% 33%	2199
	21st to end	Night	15% 12% 3 10% 6% 5% 6% 4 6% 7% 25%	2414
June	1st to 10th	Night	17% 9% 3 6% 5% 5% 4 4 6% 8% 32%	1330
	11th to 20th	Night	20% 9% 3 7% 7% 5% 6% 4 5% 7% 28%	1330
	21st to end	Night	9% 6% 2 6% 5% 5% 6% 5% 8% 9% 39%	1330
July	1st to 10th	Night	8% 5% 3 7% 5% 4 5% 4 7% 8% 44%	2220
	11th to 20th	Night	6% 3 1 4 3 4 5% 4 7% 11% 49%	2220
	21st to end	Night	5% 5% 2 5% 4 4 4 3 5% 8% 56%	2531
August	1st to 10th	Night	11% 7% 2 6% 3 4 5% 4 6% 9% 43%	2529
	11th to 20th	Night	8% 5% 2 6% 4 5% 5% 5% 7% 11% 42%	2719
	21st to end	Night	9% 5% 2 5% 3 4 4 3 5% 8% 50%	3146
September	1st to 10th	Night	12% 6% 2 5% 4 2 4 3 6% 8% 47%	1821
	11th to 20th	Night	15% 8% 2 5% 3 4 3 4 5% 7% 44%	2087
	21st to end	Night	10% 8% 2 5% 4 4 4 5% 6% 7% 45%	2090
October	1st to 10th	Night	8% 7% 3 5% 4 4 4 4 6% 8% 47%	3606
	11th to 20th	Night	6% 8% 2 7% 4 5% 4 4 5% 8% 47%	4050
	21st to end	Night	5% 8% 3 8% 5% 5% 5% 5% 6% 8% 43%	4457
November	1st to 10th	Night	6% 14% 3 9% 5% 5% 5% 4 7% 7% 35%	2636
	11th to 20th	Night	3 11% 4 9% 6% 5% 5% 5% 6% 8% 37%	2910
	21st to end	Night	3 10% 4 9% 7% 7% 6% 4 6% 8% 35%	3000
December	1st to 10th	Night	4 12% 5% 10% 6% 6% 5% 5% 7% 8% 32%	4890
	11th to 20th	Night	3 11% 4 12% 8% 7% 6% 5% 7% 8% 29%	5550
	21st to end	Night	3 11% 4 10% 5% 5% 5% 4 6% 7% 40%	7458

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	49% 5% 10% 22% 11% 3	3179
	11th to 20th	Day	44% 6% 12% 15% 19% 3	3249
	21st to end	Day	33% 8% 15% 32% 12% 1	4004
February	1st to 10th	Day	50% 7% 16% 16% 9% 3	1600
	11th to 20th	Day	47% 9% 13% 21% 9% 2	1724
	21st to end	Day	47% 7% 13% 20% 11% 2	1616
March	1st to 10th	Day	40% 6% 16% 21% 16% 1	4518
	11th to 20th	Day	41% 5% 16% 23% 15% 1	4907
	21st to end	Day	61% 8% 11% 14% 6% 1	5614
April	1st to 10th	Day	54% 8% 15% 15% 7%	2445
	11th to 20th	Day	55% 6% 11% 18% 9% 1	2570
	21st to end	Day	50% 8% 14% 20% 7% 1	2537
May	1st to 10th	Day	56% 7% 11% 21% 5%	4380
	11th to 20th	Day	45% 11% 15% 20% 8%	4698
	21st to end	Day	58% 11% 12% 13% 5% 1	5162
June	1st to 10th	Day	52% 9% 16% 15% 7% 1	2850
	11th to 20th	Day	58% 9% 12% 14% 6% 1	2850
	21st to end	Day	40% 11% 18% 22% 8% 2	2850
July	1st to 10th	Day	34% 7% 15% 24% 17% 3	4666
	11th to 20th	Day	30% 8% 17% 33% 10% 1	4659
	21st to end	Day	27% 7% 14% 27% 20% 5%	4859
August	1st to 10th	Day	38% 9% 15% 31% 7%	4384
	11th to 20th	Day	34% 8% 23% 27% 6% 1	4156
	21st to end	Day	31% 7% 21% 31% 9% 2	4520
September	1st to 10th	Day	36% 6% 16% 24% 13% 4	2356
	11th to 20th	Day	41% 6% 15% 25% 11% 1	2092
	21st to end	Day	38% 8% 14% 25% 12% 2	2090
October	1st to 10th	Day	35% 6% 19% 33% 6% 1	3369
	11th to 20th	Day	37% 6% 20% 22% 11% 3	2876
	21st to end	Day	40% 4 11% 32% 11% 1	3101
November	1st to 10th	Day	49% 8% 13% 19% 9% 2	1642
	11th to 20th	Day	43% 7% 16% 22% 10% 2	1487
	21st to end	Day	44% 7% 16% 22% 9% 3	1400
December	1st to 10th	Day	50% 6% 15% 20% 8% 2	2290
	11th to 20th	Day	44% 7% 22% 20% 7% 1	2644
	21st to end	Day	39% 5% 12% 22% 19% 4	3498
January	1st to 10th	Night	52% 9% 11% 20% 6% 2	6766
	11th to 20th	Night	47% 6% 12% 17% 13% 5%	6753
	21st to end	Night	39% 7% 16% 24% 13% 1	6952
February	1st to 10th	Night	51% 8% 11% 17% 12% 2	2800
	11th to 20th	Night	47% 8% 14% 18% 12% 2	2572
	21st to end	Night	45% 5% 13% 21% 14% 2	2010
March	1st to 10th	Night	41% 7% 17% 21% 11% 2	5376
	11th to 20th	Night	41% 8% 15% 21% 14% 1	5093
	21st to end	Night	56% 8% 13% 13% 9% 1	5358
April	1st to 10th	Night	49% 8% 14% 18% 11% 1	1955
	11th to 20th	Night	53% 6% 12% 19% 8% 1	1781
	21st to end	Night	49% 9% 14% 20% 6% 2	1759
May	1st to 10th	Night	56% 6% 12% 21% 5%	2579
	11th to 20th	Night	40% 11% 15% 25% 10%	2199
	21st to end	Night	52% 12% 14% 16% 5% 1	2414
June	1st to 10th	Night	48% 9% 15% 18% 9% 1	1330
	11th to 20th	Night	53% 9% 13% 15% 8% 2	1330
	21st to end	Night	37% 11% 19% 24% 7% 1	1330
July	1st to 10th	Night	35% 8% 15% 22% 18% 3	2185
	11th to 20th	Night	26% 9% 23% 29% 8% 5%	2178
	21st to end	Night	27% 6% 13% 33% 19% 2	2451
August	1st to 10th	Night	36% 7% 14% 33% 9%	2521
	11th to 20th	Night	34% 8% 26% 25% 7%	2744
	21st to end	Night	31% 6% 21% 30% 10% 1	3146
September	1st to 10th	Night	33% 7% 17% 25% 13% 4	1821
	11th to 20th	Night	37% 7% 15% 25% 12% 4	2087
	21st to end	Night	35% 6% 19% 23% 13% 3	2090
October	1st to 10th	Night	35% 5% 18% 26% 15% 1	3606
	11th to 20th	Night	35% 6% 19% 27% 12% 1	4050
	21st to end	Night	37% 6% 12% 31% 13%	4457
November	1st to 10th	Night	46% 8% 13% 21% 11% 2	2636
	11th to 20th	Night	43% 7% 16% 20% 12% 2	2910
	21st to end	Night	43% 7% 17% 20% 9% 3	3000
December	1st to 10th	Night	48% 6% 18% 19% 7% 2	4890
	11th to 20th	Night	50% 8% 16% 17% 8% 1	5547
	21st to end	Night	41% 6% 10% 23% 16% 4	7458

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	6% 9% 31% 33% 16% 7%	200
	11th to 20th	Day	4 11% 37% 29% 19% 2	200
	21st to end	Day	6% 11% 32% 36% 11% 4	220
February	1st to 10th	Day	8% 12% 39% 27% 10% 6%	200
	11th to 20th	Day	8% 9% 36% 35% 10% 1	280
	21st to end	Day	10% 10% 33% 31% 14% 2	380
March	1st to 10th	Day	9% 10% 38% 28% 11% 3	500
	11th to 20th	Day	9% 13% 32% 32% 10% 4	500
	21st to end	Day	15% 13% 32% 26% 10% 5%	550
April	1st to 10th	Day	13% 13% 34% 27% 10% 3	500
	11th to 20th	Day	18% 13% 27% 27% 13% 3	492
	21st to end	Day	17% 13% 29% 26% 12% 3	481
May	1st to 10th	Day	19% 14% 22% 24% 19% 2	500
	11th to 20th	Day	17% 8% 24% 30% 17% 4	675
	21st to end	Day	21% 8% 17% 30% 19% 5%	734
June	1st to 10th	Day	18% 10% 28% 30% 11% 4	680
	11th to 20th	Day	26% 10% 23% 27% 11% 4	680
	21st to end	Day	13% 6% 24% 31% 19% 6%	680
July	1st to 10th	Day	13% 6% 23% 33% 22% 4	671
	11th to 20th	Day	16% 3 26% 30% 22% 4	668
	21st to end	Day	7% 6% 28% 35% 18% 6%	668
August	1st to 10th	Day	12% 6% 29% 30% 19% 5%	487
	11th to 20th	Day	12% 5% 23% 38% 16% 6%	477
	21st to end	Day	13% 6% 26% 30% 18% 6%	539
September	1st to 10th	Day	15% 7% 31% 28% 14% 5%	490
	11th to 20th	Day	19% 6% 28% 29% 16% 3	490
	21st to end	Day	16% 12% 32% 26% 12% 2	490
October	1st to 10th	Day	16% 9% 31% 26% 14% 5%	421
	11th to 20th	Day	13% 12% 35% 24% 12% 3	300
	21st to end	Day	14% 15% 34% 25% 11% 2	330
November	1st to 10th	Day	19% 9% 35% 28% 6% 3	300
	11th to 20th	Day	15% 13% 37% 27% 7% 1	243
	21st to end	Day	7% 9% 37% 30% 10% 8%	200
December	1st to 10th	Day	9% 6% 41% 30% 13% 3	200
	11th to 20th	Day	5% 10% 46% 26% 10% 4	200
	21st to end	Day	7% 7% 32% 34% 18% 2	220
January	1st to 10th	Night	9% 11% 39% 30% 11% 1	1000
	11th to 20th	Night	9% 8% 41% 32% 8% 1	986
	21st to end	Night	9% 12% 39% 30% 10% 1	880
February	1st to 10th	Night	9% 8% 34% 33% 13% 3	800
	11th to 20th	Night	8% 7% 38% 35% 11% 1	784
	21st to end	Night	6% 7% 37% 30% 18% 3	660
March	1st to 10th	Night	8% 5% 36% 37% 11% 3	800
	11th to 20th	Night	8% 6% 38% 35% 11% 1	800
	21st to end	Night	12% 6% 32% 35% 12% 2	880
April	1st to 10th	Night	13% 7% 31% 32% 15% 1	755
	11th to 20th	Night	17% 7% 33% 33% 10%	593
	21st to end	Night	14% 9% 29% 36% 11%	587
May	1st to 10th	Night	21% 8% 23% 36% 12% 1	444
	11th to 20th	Night	14% 4 27% 39% 16% 1	374
	21st to end	Night	21% 5% 19% 36% 19% 1	411
June	1st to 10th	Night	20% 8% 22% 35% 14% 2	380
	11th to 20th	Night	21% 6% 25% 34% 13% 2	380
	21st to end	Night	12% 4 20% 40% 23% 2	380
July	1st to 10th	Night	12% 3 17% 43% 24% 1	370
	11th to 20th	Night	11% 4 24% 38% 22% 2	368
	21st to end	Night	6% 5% 17% 44% 25% 2	416
August	1st to 10th	Night	13% 3 13% 40% 29% 2	378
	11th to 20th	Night	10% 3 14% 46% 24% 2	508
	21st to end	Night	11% 4 20% 42% 22% 1	627
September	1st to 10th	Night	16% 4 21% 37% 19% 2	681
	11th to 20th	Night	18% 3 19% 41% 18% 2	760
	21st to end	Night	12% 5% 32% 36% 13% 2	760
October	1st to 10th	Night	16% 4 30% 34% 14% 1	760
	11th to 20th	Night	13% 4 36% 33% 12% 2	760
	21st to end	Night	11% 7% 37% 35% 9% 1	836
November	1st to 10th	Night	14% 9% 40% 27% 10% 1	881
	11th to 20th	Night	9% 10% 46% 28% 6% 1	1000
	21st to end	Night	7% 8% 42% 33% 9% 1	1000
December	1st to 10th	Night	10% 9% 40% 30% 11% 2	1000
	11th to 20th	Night	5% 9% 41% 37% 8% 1	1000
	21st to end	Night	9% 7% 39% 32% 11% 2	1100

Page generated at 2025-04-23 07:25:07. Version ac07

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