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 2024-11-01.

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	9% 10% 3 8% 5% 5% 5% 4 7% 8% 35%	101892
	Night	7% 10% 4 9% 6% 5% 5% 4 6% 8% 36%	97134
Transparency	Day	43% 8% 15% 22% 10% 2	101639
	Night	43% 8% 15% 22% 10% 2	97033
Seeing	Day	14% 9% 29% 30% 15% 4	15344
	Night	11% 6% 32% 35% 13% 2	24336

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	2 9% 7% 13% 5% 5% 4 4 6% 10% 35%	2219
	11th to 20th	Day	2 9% 3 12% 6% 5% 6% 6% 8% 7% 34%	2240
	21st to end	Day	4 8% 4 9% 5% 5% 5% 4 7% 10% 40%	2794
February	1st to 10th	Day	3 11% 5% 12% 8% 5% 5% 5% 7% 8% 29%	1520
	11th to 20th	Day	4 12% 4 11% 7% 6% 6% 6% 7% 7% 31%	1627
	21st to end	Day	4 12% 6% 11% 7% 7% 5% 4 7% 8% 30%	1537
March	1st to 10th	Day	2 10% 5% 13% 7% 6% 7% 5% 7% 8% 31%	3138
	11th to 20th	Day	6% 10% 3 7% 3 4 5% 4 6% 10% 43%	3422
	21st to end	Day	6% 23% 7% 13% 5% 4 4 3 5% 6% 23%	3914
April	1st to 10th	Day	8% 16% 5% 11% 6% 5% 5% 5% 7% 8% 23%	2323
	11th to 20th	Day	11% 18% 5% 9% 5% 4 4 4 6% 7% 27%	2440
	21st to end	Day	12% 13% 4 9% 5% 5% 5% 4 6% 8% 29%	2470
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	12% 10% 3 6% 4 3 5% 3 7% 7% 38%	2021
	11th to 20th	Day	9% 9% 3 9% 4 4 6% 4 6% 9% 36%	1732
	21st to end	Day	8% 11% 4 8% 5% 5% 5% 3 7% 8% 35%	1881
November	1st to 10th	Day	7% 15% 5% 9% 5% 5% 5% 5% 5% 6% 33%	1559
	11th to 20th	Day	4 12% 4 10% 6% 5% 4 5% 6% 7% 39%	1413
	21st to end	Day	4 14% 4 8% 6% 5% 4 3 7% 9% 37%	1330
December	1st to 10th	Day	4 11% 5% 11% 6% 5% 6% 5% 7% 7% 33%	1330
	11th to 20th	Day	3 10% 5% 14% 7% 6% 5% 5% 7% 8% 29%	1682
	21st to end	Day	3 10% 4 9% 6% 5% 4 4 5% 8% 43%	2442
January	1st to 10th	Night	2 12% 6% 13% 8% 6% 6% 5% 6% 9% 26%	4726
	11th to 20th	Night	3 8% 5% 13% 7% 5% 6% 7% 6% 7% 33%	4686
	21st to end	Night	3 11% 4 11% 6% 5% 5% 4 7% 9% 34%	4862
February	1st to 10th	Night	5% 11% 4 11% 8% 7% 6% 4 6% 8% 31%	2660
	11th to 20th	Night	3 13% 5% 11% 6% 6% 6% 4 8% 8% 30%	2440
	21st to end	Night	2 11% 4 12% 7% 6% 5% 5% 6% 7% 35%	1913
March	1st to 10th	Night	2 9% 5% 14% 8% 7% 7% 5% 9% 8% 27%	3736
	11th to 20th	Night	6% 8% 3 6% 4 4 5% 4 7% 9% 45%	3557
	21st to end	Night	6% 19% 7% 13% 7% 6% 5% 4 5% 7% 21%	3736
April	1st to 10th	Night	7% 16% 4 9% 6% 5% 5% 5% 6% 8% 30%	1857
	11th to 20th	Night	9% 15% 4 11% 6% 5% 5% 3 5% 7% 30%	1691
	21st to end	Night	10% 12% 4 9% 6% 5% 6% 5% 7% 7% 30%	1710
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	10% 10% 3 6% 5% 4 4 4 6% 7% 41%	2158
	11th to 20th	Night	7% 10% 2 8% 4 6% 5% 5% 5% 8% 40%	2446
	21st to end	Night	7% 10% 3 9% 5% 6% 5% 4 6% 8% 37%	2717
November	1st to 10th	Night	6% 14% 3 9% 5% 5% 5% 4 7% 7% 34%	2506
	11th to 20th	Night	3 11% 4 9% 6% 5% 5% 5% 6% 8% 37%	2764
	21st to end	Night	3 10% 4 9% 6% 6% 6% 4 6% 8% 36%	2850
December	1st to 10th	Night	4 13% 5% 10% 6% 6% 5% 4 6% 7% 34%	2850
	11th to 20th	Night	2 9% 4 11% 7% 7% 6% 5% 7% 8% 32%	3510
	21st to end	Night	2 10% 4 9% 6% 5% 5% 4 6% 6% 42%	5214

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	43% 6% 13% 25% 11% 3	2219
	11th to 20th	Day	43% 8% 10% 16% 18% 4	2261
	21st to end	Day	35% 10% 15% 31% 8% 1	2794
February	1st to 10th	Day	49% 7% 16% 17% 8% 3	1520
	11th to 20th	Day	48% 9% 14% 20% 8% 2	1636
	21st to end	Day	48% 8% 13% 20% 10% 1	1537
March	1st to 10th	Day	47% 8% 17% 15% 12% 1	3138
	11th to 20th	Day	35% 6% 20% 25% 13% 1	3423
	21st to end	Day	59% 9% 11% 15% 6%	3914
April	1st to 10th	Day	55% 8% 16% 14% 7%	2323
	11th to 20th	Day	55% 6% 11% 19% 9% 1	2440
	21st to end	Day	51% 8% 14% 19% 7% 1	2470
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	43% 7% 15% 26% 9% 1	2021
	11th to 20th	Day	42% 7% 17% 23% 9% 2	1732
	21st to end	Day	45% 6% 14% 23% 11% 1	1881
November	1st to 10th	Day	50% 8% 13% 19% 9% 2	1559
	11th to 20th	Day	43% 7% 16% 23% 10% 2	1413
	21st to end	Day	42% 7% 16% 22% 9% 3	1330
December	1st to 10th	Day	48% 7% 14% 15% 13% 3	1330
	11th to 20th	Day	47% 9% 18% 17% 8% 2	1684
	21st to end	Day	37% 6% 12% 21% 19% 5%	2442
January	1st to 10th	Night	50% 10% 12% 18% 8% 2	4726
	11th to 20th	Night	46% 7% 11% 16% 13% 6%	4727
	21st to end	Night	42% 8% 15% 22% 11% 1	4862
February	1st to 10th	Night	50% 8% 11% 18% 11% 2	2660
	11th to 20th	Night	47% 8% 14% 18% 11% 2	2441
	21st to end	Night	45% 5% 13% 21% 13% 2	1913
March	1st to 10th	Night	47% 10% 13% 20% 9% 1	3736
	11th to 20th	Night	33% 10% 18% 23% 15% 1	3557
	21st to end	Night	58% 11% 13% 13% 4 1	3736
April	1st to 10th	Night	50% 8% 14% 17% 10% 1	1857
	11th to 20th	Night	52% 7% 13% 19% 8% 1	1691
	21st to end	Night	49% 9% 14% 20% 6% 2	1710
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	42% 7% 16% 23% 12% 2	2158
	11th to 20th	Night	39% 7% 17% 23% 11% 2	2446
	21st to end	Night	43% 9% 14% 24% 10% 1	2717
November	1st to 10th	Night	46% 8% 13% 21% 11% 2	2506
	11th to 20th	Night	42% 7% 17% 20% 12% 2	2764
	21st to end	Night	42% 7% 17% 20% 10% 4	2850
December	1st to 10th	Night	47% 6% 14% 20% 10% 3	2850
	11th to 20th	Night	45% 10% 16% 21% 7% 1	3507
	21st to end	Night	37% 8% 12% 23% 14% 6%	5214

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% 8% 31% 34% 14% 7%	180
	11th to 20th	Day	4 8% 36% 32% 19% 2	180
	21st to end	Day	6% 9% 31% 39% 12% 4	198
February	1st to 10th	Day	8% 13% 38% 26% 10% 6%	180
	11th to 20th	Day	9% 8% 35% 36% 11% 1	252
	21st to end	Day	7% 9% 32% 34% 15% 3	349
March	1st to 10th	Day	8% 11% 40% 28% 11% 3	460
	11th to 20th	Day	9% 12% 31% 32% 11% 4	460
	21st to end	Day	13% 12% 33% 25% 11% 5%	506
April	1st to 10th	Day	13% 13% 35% 27% 10% 2	460
	11th to 20th	Day	18% 12% 26% 28% 14% 3	452
	21st to end	Day	17% 13% 29% 27% 12% 2	460
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	13% 14% 34% 26% 11% 2	330
November	1st to 10th	Day	20% 8% 34% 29% 7% 3	270
	11th to 20th	Day	13% 13% 36% 29% 8% 1	219
	21st to end	Day	7% 9% 35% 30% 11% 7%	180
December	1st to 10th	Day	8% 6% 39% 30% 14% 3	180
	11th to 20th	Day	4 9% 46% 27% 10% 3	180
	21st to end	Day	7% 6% 33% 34% 18% 2	198
January	1st to 10th	Night	9% 10% 39% 30% 11% 1	950
	11th to 20th	Night	9% 7% 41% 34% 9% 1	937
	21st to end	Night	9% 12% 37% 32% 10% 1	836
February	1st to 10th	Night	9% 8% 34% 32% 14% 3	760
	11th to 20th	Night	8% 7% 37% 36% 11% 1	744
	21st to end	Night	5% 6% 36% 31% 19% 3	628
March	1st to 10th	Night	8% 5% 37% 37% 11% 3	760
	11th to 20th	Night	8% 7% 37% 35% 12% 1	760
	21st to end	Night	12% 6% 31% 36% 13% 2	836
April	1st to 10th	Night	13% 7% 32% 32% 15% 2	717
	11th to 20th	Night	17% 6% 33% 34% 10%	563
	21st to end	Night	15% 9% 29% 36% 11%	570
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% 8% 38% 28% 10% 1	837
	11th to 20th	Night	9% 9% 46% 29% 6% 1	950
	21st to end	Night	7% 8% 43% 32% 9% 1	950
December	1st to 10th	Night	10% 8% 39% 31% 11% 2	950
	11th to 20th	Night	4 8% 41% 37% 9% 1	950
	21st to end	Night	10% 7% 38% 33% 11% 2	1045

Page generated at 2024-10-29 09:20:51. Version ac07

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