Wasagaming
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wasagaming clear sky chart from 2005-11-06 to 2025-02-25.

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	10% 9% 3 9% 6% 6% 5% 4 6% 8% 34%	112192
	Night	8% 9% 4 11% 7% 6% 6% 5% 7% 8% 32%	115201
Transparency	Day	47% 7% 14% 23% 8% 1	111945
	Night	48% 6% 13% 22% 10% 1	115095
Seeing	Day	14% 11% 32% 28% 13% 3	16611
	Night	13% 9% 34% 31% 11% 1	26764

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	3 13% 6% 18% 8% 9% 7% 6% 7% 7% 17%	3179
	11th to 20th	Day	3 8% 5% 13% 8% 7% 7% 9% 13% 10% 15%	3387
	21st to end	Day	4 11% 6% 15% 9% 7% 7% 4 6% 7% 23%	4004
February	1st to 10th	Day	8% 10% 5% 12% 8% 5% 7% 5% 8% 11% 20%	1600
	11th to 20th	Day	4 9% 4 9% 9% 8% 8% 6% 7% 8% 28%	1740
	21st to end	Day	6% 11% 6% 11% 7% 8% 6% 5% 7% 9% 24%	1610
March	1st to 10th	Day	8% 13% 4 11% 8% 7% 6% 3 6% 8% 26%	3130
	11th to 20th	Day	6% 10% 5% 13% 8% 7% 6% 5% 6% 8% 27%	3382
	21st to end	Day	6% 9% 4 11% 7% 6% 5% 4 6% 7% 35%	3941
April	1st to 10th	Day	7% 10% 3 9% 6% 6% 5% 5% 6% 8% 35%	2291
	11th to 20th	Day	12% 13% 4 8% 6% 5% 6% 4 5% 6% 31%	2442
	21st to end	Day	13% 8% 3 7% 5% 5% 5% 5% 5% 6% 37%	2470
May	1st to 10th	Day	16% 11% 3 7% 4 4 5% 3 5% 7% 36%	4323
	11th to 20th	Day	18% 9% 3 7% 4 4 5% 4 6% 7% 33%	4665
	21st to end	Day	18% 9% 2 7% 5% 4 5% 4 5% 8% 33%	5173
June	1st to 10th	Day	15% 7% 3 7% 6% 5% 5% 5% 6% 8% 34%	2850
	11th to 20th	Day	19% 8% 3 7% 5% 6% 5% 4 6% 8% 30%	2850
	21st to end	Day	12% 8% 2 7% 5% 6% 6% 5% 7% 9% 33%	2850
July	1st to 10th	Day	10% 4 2 6% 6% 6% 7% 5% 7% 10% 37%	4750
	11th to 20th	Day	7% 4 2 5% 4 4 5% 5% 7% 9% 48%	4750
	21st to end	Day	6% 3 2 5% 4 5% 5% 5% 7% 10% 48%	4903
August	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 5% 7% 9% 40%	4412
	11th to 20th	Day	10% 5% 2 5% 3 4 4 4 7% 10% 45%	4129
	21st to end	Day	11% 5% 3 6% 4 4 4 3 6% 9% 45%	4532
September	1st to 10th	Day	11% 5% 2 7% 4 4 4 3 6% 7% 46%	2316
	11th to 20th	Day	15% 8% 3 6% 4 4 4 4 6% 8% 39%	2105
	21st to end	Day	13% 8% 3 6% 4 4 4 3 6% 7% 43%	2090
October	1st to 10th	Day	13% 10% 2 6% 3 4 3 3 4 8% 43%	3366
	11th to 20th	Day	9% 9% 3 7% 5% 5% 5% 4 6% 10% 38%	2841
	21st to end	Day	10% 15% 5% 10% 5% 4 5% 3 6% 7% 30%	3091
November	1st to 10th	Day	16% 15% 6% 11% 8% 5% 3 3 4 5% 23%	1698
	11th to 20th	Day	9% 14% 5% 15% 8% 7% 6% 3 5% 6% 22%	1495
	21st to end	Day	8% 14% 5% 13% 8% 7% 5% 3 6% 7% 24%	1400
December	1st to 10th	Day	6% 10% 6% 14% 12% 10% 8% 6% 8% 6% 14%	2290
	11th to 20th	Day	7% 13% 5% 13% 9% 10% 7% 5% 7% 7% 18%	2639
	21st to end	Day	3 9% 4 12% 9% 7% 6% 4 6% 7% 33%	3498
January	1st to 10th	Night	4 10% 6% 18% 9% 7% 8% 6% 8% 7% 17%	6787
	11th to 20th	Night	3 9% 5% 16% 9% 8% 10% 8% 11% 9% 13%	6514
	21st to end	Night	5% 10% 7% 19% 9% 7% 6% 5% 6% 6% 19%	6974
February	1st to 10th	Night	8% 12% 5% 10% 5% 7% 8% 5% 8% 10% 23%	2800
	11th to 20th	Night	5% 7% 3 8% 7% 6% 7% 7% 8% 9% 32%	2565
	21st to end	Night	6% 9% 4 12% 10% 6% 7% 4 6% 7% 29%	1938
March	1st to 10th	Night	9% 12% 4 10% 6% 7% 6% 5% 6% 7% 30%	3734
	11th to 20th	Night	5% 10% 4 10% 6% 7% 5% 4 6% 7% 36%	3578
	21st to end	Night	6% 8% 4 11% 7% 6% 5% 4 6% 6% 37%	3681
April	1st to 10th	Night	5% 10% 3 8% 5% 5% 5% 4 7% 9% 40%	1888
	11th to 20th	Night	12% 12% 4 9% 6% 4 6% 3 6% 5% 32%	1689
	21st to end	Night	12% 9% 4 8% 5% 5% 5% 5% 6% 6% 35%	1710
May	1st to 10th	Night	15% 11% 3 7% 4 5% 5% 5% 6% 7% 34%	2643
	11th to 20th	Night	14% 7% 3 6% 5% 4 4 4 5% 8% 39%	2239
	21st to end	Night	16% 7% 3 7% 4 4 4 4 5% 7% 37%	2414
June	1st to 10th	Night	13% 7% 2 7% 5% 4 5% 3 6% 8% 40%	1330
	11th to 20th	Night	15% 7% 2 5% 5% 4 5% 4 7% 7% 38%	1330
	21st to end	Night	12% 5% 3 6% 4 5% 6% 5% 7% 8% 39%	1330
July	1st to 10th	Night	8% 3 2 5% 3 3 6% 4 7% 9% 50%	2220
	11th to 20th	Night	6% 3 1 4 3 3 3 3 5% 8% 59%	2220
	21st to end	Night	5% 3 2 5% 3 3 4 3 6% 9% 58%	2657
August	1st to 10th	Night	6% 5% 2 5% 4 4 5% 4 6% 7% 50%	2528
	11th to 20th	Night	7% 4 2 5% 4 4 5% 4 7% 10% 49%	2708
	21st to end	Night	12% 7% 2 5% 3 4 4 3 5% 9% 47%	3135
September	1st to 10th	Night	8% 5% 2 5% 3 3 4 5% 7% 7% 52%	1862
	11th to 20th	Night	13% 7% 2 6% 4 4 4 4 5% 6% 45%	2074
	21st to end	Night	11% 8% 2 6% 3 4 5% 4 6% 7% 42%	2090
October	1st to 10th	Night	8% 10% 3 6% 3 4 5% 3 5% 8% 45%	3562
	11th to 20th	Night	7% 8% 2 8% 4 5% 5% 4 7% 9% 40%	4087
	21st to end	Night	8% 10% 5% 9% 5% 5% 5% 4 6% 7% 38%	4467
November	1st to 10th	Night	12% 14% 6% 12% 7% 5% 5% 3 5% 6% 25%	2598
	11th to 20th	Night	8% 15% 6% 14% 8% 7% 6% 4 5% 5% 22%	2901
	21st to end	Night	9% 11% 4 13% 10% 7% 5% 5% 5% 7% 24%	3000
December	1st to 10th	Night	5% 14% 6% 16% 10% 8% 6% 6% 8% 7% 14%	4900
	11th to 20th	Night	7% 12% 5% 13% 10% 7% 6% 5% 6% 7% 21%	5568
	21st to end	Night	4 7% 3 12% 10% 7% 7% 4 7% 8% 29%	7480

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	62% 7% 8% 15% 7%	3179
	11th to 20th	Day	53% 6% 6% 22% 11% 1	3410
	21st to end	Day	55% 6% 10% 21% 7%	4004
February	1st to 10th	Day	53% 7% 14% 15% 10% 1	1600
	11th to 20th	Day	48% 8% 10% 20% 13%	1749
	21st to end	Day	51% 7% 13% 17% 12%	1610
March	1st to 10th	Day	54% 7% 11% 21% 7%	3130
	11th to 20th	Day	50% 9% 13% 19% 9% 1	3384
	21st to end	Day	45% 9% 13% 21% 11%	3941
April	1st to 10th	Day	48% 8% 13% 21% 10% 1	2291
	11th to 20th	Day	53% 7% 11% 17% 10% 1	2442
	21st to end	Day	46% 8% 14% 22% 8% 1	2470
May	1st to 10th	Day	49% 7% 11% 24% 8%	4323
	11th to 20th	Day	48% 8% 11% 22% 9% 2	4669
	21st to end	Day	47% 9% 12% 26% 6%	5173
June	1st to 10th	Day	48% 8% 15% 20% 9% 1	2850
	11th to 20th	Day	52% 8% 15% 16% 9% 1	2850
	21st to end	Day	47% 10% 15% 22% 6% 1	2850
July	1st to 10th	Day	41% 8% 24% 22% 5%	4676
	11th to 20th	Day	31% 7% 18% 37% 6%	4669
	21st to end	Day	30% 6% 23% 31% 9% 1	4748
August	1st to 10th	Day	39% 6% 17% 29% 9%	4396
	11th to 20th	Day	34% 7% 21% 31% 6%	4170
	21st to end	Day	37% 5% 20% 30% 7%	4531
September	1st to 10th	Day	37% 7% 13% 29% 12% 2	2316
	11th to 20th	Day	43% 7% 17% 25% 8%	2105
	21st to end	Day	41% 6% 11% 31% 10%	2090
October	1st to 10th	Day	43% 4 12% 34% 8%	3366
	11th to 20th	Day	43% 5% 11% 33% 7%	2841
	21st to end	Day	54% 4 13% 22% 7%	3091
November	1st to 10th	Day	63% 3 10% 16% 7% 1	1698
	11th to 20th	Day	59% 6% 13% 13% 8% 1	1495
	21st to end	Day	59% 6% 12% 17% 6%	1400
December	1st to 10th	Day	67% 6% 14% 9% 4 1	2290
	11th to 20th	Day	63% 4 10% 15% 8%	2640
	21st to end	Day	48% 4 10% 18% 17% 4	3498
January	1st to 10th	Night	58% 7% 11% 15% 10%	6787
	11th to 20th	Night	61% 6% 8% 18% 8%	6553
	21st to end	Night	60% 7% 11% 16% 7%	6974
February	1st to 10th	Night	51% 9% 9% 18% 11% 2	2800
	11th to 20th	Night	42% 8% 12% 22% 16% 1	2566
	21st to end	Night	51% 4 10% 23% 12% 1	1938
March	1st to 10th	Night	49% 6% 12% 21% 11% 1	3734
	11th to 20th	Night	41% 7% 16% 18% 16% 1	3578
	21st to end	Night	45% 7% 10% 28% 10%	3681
April	1st to 10th	Night	39% 7% 12% 22% 17% 3	1888
	11th to 20th	Night	51% 6% 10% 21% 12% 2	1689
	21st to end	Night	48% 7% 12% 22% 9% 2	1710
May	1st to 10th	Night	48% 7% 12% 19% 14%	2643
	11th to 20th	Night	42% 6% 14% 24% 12% 2	2239
	21st to end	Night	43% 10% 13% 26% 8%	2414
June	1st to 10th	Night	42% 8% 16% 23% 10% 1	1330
	11th to 20th	Night	42% 10% 15% 23% 10% 1	1330
	21st to end	Night	40% 9% 20% 24% 6% 1	1330
July	1st to 10th	Night	29% 7% 29% 27% 7%	2185
	11th to 20th	Night	24% 6% 19% 43% 8%	2178
	21st to end	Night	26% 5% 23% 32% 13% 1	2573
August	1st to 10th	Night	33% 5% 19% 29% 13%	2520
	11th to 20th	Night	31% 5% 26% 30% 8% 1	2733
	21st to end	Night	36% 5% 17% 32% 9%	3135
September	1st to 10th	Night	30% 7% 14% 34% 13% 2	1862
	11th to 20th	Night	40% 7% 14% 29% 11% 1	2074
	21st to end	Night	40% 7% 11% 28% 12% 2	2090
October	1st to 10th	Night	39% 5% 13% 26% 17% 1	3562
	11th to 20th	Night	41% 4 11% 31% 12% 1	4087
	21st to end	Night	46% 4 13% 31% 6%	4467
November	1st to 10th	Night	59% 5% 12% 15% 7% 2	2598
	11th to 20th	Night	61% 6% 13% 14% 5% 1	2901
	21st to end	Night	59% 6% 13% 16% 6%	3000
December	1st to 10th	Night	65% 5% 11% 12% 5% 1	4900
	11th to 20th	Night	59% 4 10% 15% 11% 1	5566
	21st to end	Night	49% 5% 11% 16% 15% 4	7480

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	8% 8% 37% 31% 14% 2	300
	11th to 20th	Day	7% 12% 36% 37% 7% 1	300
	21st to end	Day	12% 8% 33% 34% 10% 3	330
February	1st to 10th	Day	11% 10% 42% 27% 9% 1	300
	11th to 20th	Day	7% 14% 33% 27% 16% 3	300
	21st to end	Day	4 11% 36% 34% 12% 3	237
March	1st to 10th	Day	14% 8% 33% 32% 11% 1	270
	11th to 20th	Day	10% 14% 31% 29% 15% 1	270
	21st to end	Day	13% 13% 31% 31% 10% 2	373
April	1st to 10th	Day	11% 14% 38% 27% 8% 1	471
	11th to 20th	Day	18% 13% 32% 26% 9% 2	640
	21st to end	Day	16% 11% 34% 28% 10% 1	650
May	1st to 10th	Day	16% 11% 31% 29% 12% 2	653
	11th to 20th	Day	17% 9% 31% 26% 12% 4	675
	21st to end	Day	20% 9% 27% 28% 14% 2	734
June	1st to 10th	Day	17% 13% 33% 22% 10% 5%	680
	11th to 20th	Day	20% 14% 31% 20% 13% 2	680
	21st to end	Day	14% 9% 26% 32% 15% 3	680
July	1st to 10th	Day	9% 9% 28% 31% 18% 6%	671
	11th to 20th	Day	12% 11% 30% 26% 17% 5%	668
	21st to end	Day	7% 9% 29% 30% 18% 6%	739
August	1st to 10th	Day	10% 8% 31% 29% 17% 5%	676
	11th to 20th	Day	12% 8% 25% 29% 20% 7%	665
	21st to end	Day	14% 10% 26% 31% 17% 2	748
September	1st to 10th	Day	13% 14% 34% 26% 12% 1	526
	11th to 20th	Day	18% 11% 33% 26% 10% 2	315
	21st to end	Day	18% 12% 35% 28% 7% 1	300
October	1st to 10th	Day	23% 11% 28% 24% 11% 3	300
	11th to 20th	Day	17% 13% 39% 24% 5% 3	300
	21st to end	Day	21% 15% 32% 24% 6% 3	330
November	1st to 10th	Day	22% 14% 28% 28% 7% 1	300
	11th to 20th	Day	15% 17% 38% 24% 5% 1	300
	21st to end	Day	14% 12% 39% 27% 7% 1	300
December	1st to 10th	Day	11% 11% 36% 27% 12% 3	300
	11th to 20th	Day	11% 13% 44% 25% 6% 1	300
	21st to end	Day	11% 4 38% 29% 14% 5%	330
January	1st to 10th	Night	10% 12% 38% 28% 11% 1	1000
	11th to 20th	Night	12% 11% 39% 29% 9% 1	1000
	21st to end	Night	13% 12% 39% 28% 7% 1	1100
February	1st to 10th	Night	14% 10% 35% 32% 9% 2	1000
	11th to 20th	Night	8% 9% 35% 34% 11% 1	969
	21st to end	Night	9% 9% 33% 35% 12% 3	646
March	1st to 10th	Night	14% 9% 31% 33% 12% 1	760
	11th to 20th	Night	10% 11% 38% 29% 11% 1	629
	21st to end	Night	13% 7% 33% 31% 13% 3	627
April	1st to 10th	Night	11% 7% 36% 35% 11% 1	570
	11th to 20th	Night	18% 9% 32% 31% 10% 1	563
	21st to end	Night	16% 9% 35% 31% 8% 1	570
May	1st to 10th	Night	18% 7% 29% 36% 9% 1	570
	11th to 20th	Night	17% 7% 31% 31% 13% 1	561
	21st to end	Night	21% 7% 25% 35% 12%	617
June	1st to 10th	Night	14% 9% 32% 29% 15% 1	570
	11th to 20th	Night	16% 7% 31% 31% 13% 1	570
	21st to end	Night	14% 6% 28% 35% 17%	570
July	1st to 10th	Night	8% 6% 25% 41% 19% 1	555
	11th to 20th	Night	8% 6% 31% 36% 17% 2	552
	21st to end	Night	8% 5% 29% 38% 18% 4	624
August	1st to 10th	Night	8% 5% 26% 40% 18% 2	567
	11th to 20th	Night	10% 5% 23% 34% 23% 4	564
	21st to end	Night	16% 6% 26% 35% 16% 1	627
September	1st to 10th	Night	10% 6% 32% 34% 17% 1	570
	11th to 20th	Night	17% 7% 33% 33% 9% 1	570
	21st to end	Night	15% 7% 34% 32% 11% 1	570
October	1st to 10th	Night	18% 9% 33% 30% 9% 1	613
	11th to 20th	Night	17% 11% 32% 30% 9% 1	940
	21st to end	Night	16% 12% 38% 25% 7% 2	1045
November	1st to 10th	Night	18% 13% 37% 23% 8% 1	975
	11th to 20th	Night	15% 13% 41% 24% 7% 1	1000
	21st to end	Night	14% 15% 39% 27% 5% 1	1000
December	1st to 10th	Night	10% 10% 37% 29% 11% 2	1000
	11th to 20th	Night	14% 13% 37% 26% 9% 1	1000
	21st to end	Night	13% 9% 34% 31% 12% 2	1100

Page generated at 2025-02-22 05:51:40. Version ac07

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