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 2026-07-01.

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% 9% 3 9% 6% 6% 5% 4 6% 8% 34%	142183
	Night	7% 9% 4 11% 6% 6% 6% 5% 6% 8% 33%	139024
Transparency	Day	47% 6% 14% 24% 9% 1	141894
	Night	48% 5% 13% 22% 11% 1	138898
Seeing	Day	14% 11% 32% 27% 12% 3	18576
	Night	13% 10% 34% 31% 11% 1	28540

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 12% 6% 18% 8% 8% 6% 6% 7% 7% 20%	4125
	11th to 20th	Day	3 9% 6% 13% 9% 8% 9% 9% 11% 9% 14%	4417
	21st to end	Day	4 9% 5% 12% 7% 7% 8% 4 6% 10% 28%	5188
February	1st to 10th	Day	7% 10% 5% 13% 9% 5% 7% 5% 8% 11% 20%	1680
	11th to 20th	Day	4 9% 4 9% 8% 8% 8% 6% 7% 8% 28%	1830
	21st to end	Day	5% 11% 6% 11% 7% 8% 6% 6% 7% 9% 23%	1730
March	1st to 10th	Day	6% 10% 4 13% 9% 7% 7% 4 7% 9% 23%	4600
	11th to 20th	Day	5% 11% 6% 13% 8% 7% 6% 4 6% 8% 25%	4950
	21st to end	Day	9% 9% 4 11% 7% 5% 5% 4 6% 7% 33%	5772
April	1st to 10th	Day	7% 10% 4 10% 5% 6% 5% 5% 5% 8% 35%	2533
	11th to 20th	Day	11% 13% 5% 9% 6% 5% 5% 4 5% 7% 30%	2702
	21st to end	Day	12% 9% 4 7% 5% 4 5% 5% 6% 7% 37%	2730
May	1st to 10th	Day	10% 8% 3 7% 4 5% 5% 4 6% 7% 43%	8026
	11th to 20th	Day	17% 11% 4 8% 5% 4 5% 4 5% 6% 32%	8719
	21st to end	Day	12% 8% 2 6% 4 4 4 4 5% 8% 43%	9683
June	1st to 10th	Day	15% 8% 3 8% 5% 5% 5% 4 6% 8% 34%	3150
	11th to 20th	Day	17% 8% 3 7% 5% 6% 5% 5% 6% 8% 30%	3150
	21st to end	Day	13% 8% 2 7% 5% 6% 6% 5% 7% 9% 32%	3150
July	1st to 10th	Day	8% 5% 2 7% 6% 6% 6% 5% 7% 10% 39%	6801
	11th to 20th	Day	10% 5% 2 6% 5% 5% 6% 5% 7% 9% 41%	6800
	21st to end	Day	8% 4 2 6% 4 4 5% 5% 7% 11% 44%	7041
August	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 5% 7% 9% 40%	4552
	11th to 20th	Day	10% 5% 2 5% 3 4 4 4 7% 10% 45%	4262
	21st to end	Day	11% 5% 3 6% 4 4 4 3 6% 9% 45%	4675
September	1st to 10th	Day	11% 5% 3 7% 4 4 4 3 6% 8% 46%	2438
	11th to 20th	Day	15% 8% 3 6% 4 4 4 4 6% 7% 37%	2216
	21st to end	Day	13% 7% 3 6% 4 4 4 3 5% 7% 45%	2200
October	1st to 10th	Day	13% 10% 3 6% 3 4 3 3 4 8% 43%	3473
	11th to 20th	Day	9% 9% 3 7% 5% 5% 5% 4 6% 9% 38%	2931
	21st to end	Day	10% 15% 5% 10% 5% 4 5% 3 6% 7% 30%	3190
November	1st to 10th	Day	16% 15% 6% 11% 8% 5% 3 3 4 5% 24%	1785
	11th to 20th	Day	9% 14% 4 15% 8% 7% 6% 3 6% 6% 23%	1570
	21st to end	Day	7% 13% 5% 13% 9% 7% 5% 3 6% 7% 24%	1470
December	1st to 10th	Day	6% 10% 6% 14% 12% 9% 8% 6% 8% 6% 14%	2360
	11th to 20th	Day	7% 13% 5% 13% 9% 10% 7% 5% 7% 7% 18%	2709
	21st to end	Day	4 9% 4 12% 9% 7% 6% 4 6% 7% 33%	3575
January	1st to 10th	Night	5% 10% 6% 18% 10% 7% 8% 6% 7% 7% 17%	8799
	11th to 20th	Night	3 9% 6% 15% 8% 8% 10% 8% 10% 8% 14%	8494
	21st to end	Night	4 8% 5% 15% 8% 7% 7% 5% 7% 9% 23%	9026
February	1st to 10th	Night	8% 12% 5% 10% 5% 7% 7% 5% 8% 10% 23%	2940
	11th to 20th	Night	5% 7% 3 8% 7% 6% 7% 7% 8% 9% 32%	2696
	21st to end	Night	6% 9% 4 11% 10% 6% 8% 5% 6% 7% 29%	2076
March	1st to 10th	Night	7% 11% 4 14% 6% 6% 5% 4 6% 7% 29%	5494
	11th to 20th	Night	5% 10% 4 12% 6% 7% 6% 5% 6% 8% 30%	5233
	21st to end	Night	8% 11% 5% 12% 7% 6% 5% 4 6% 6% 32%	5396
April	1st to 10th	Night	6% 9% 3 8% 5% 5% 5% 4 7% 9% 39%	2086
	11th to 20th	Night	12% 12% 5% 9% 5% 4 6% 4 6% 5% 32%	1869
	21st to end	Night	12% 10% 3 8% 5% 5% 5% 5% 6% 6% 35%	1890
May	1st to 10th	Night	9% 8% 3 7% 5% 4 5% 4 5% 6% 44%	4918
	11th to 20th	Night	15% 8% 3 7% 5% 5% 4 4 5% 8% 34%	4172
	21st to end	Night	12% 7% 3 6% 3 4 4 4 5% 6% 47%	4523
June	1st to 10th	Night	13% 7% 2 7% 5% 4 5% 4 6% 8% 39%	1470
	11th to 20th	Night	14% 7% 2 6% 4 5% 5% 4 7% 8% 38%	1470
	21st to end	Night	12% 5% 3 6% 4 5% 6% 5% 7% 8% 39%	1470
July	1st to 10th	Night	6% 3 2 5% 3 3 5% 4 7% 9% 53%	3180
	11th to 20th	Night	8% 5% 2 6% 3 3 3 4 6% 9% 53%	3180
	21st to end	Night	6% 4 2 5% 3 3 4 3 6% 9% 55%	3821
August	1st to 10th	Night	7% 6% 2 5% 4 4 5% 4 6% 7% 49%	2608
	11th to 20th	Night	7% 4 2 5% 5% 4 5% 4 7% 10% 49%	2795
	21st to end	Night	12% 7% 2 5% 3 4 3 3 6% 9% 46%	3234
September	1st to 10th	Night	8% 5% 2 5% 3 3 4 5% 7% 7% 51%	1960
	11th to 20th	Night	14% 8% 2 6% 4 4 4 5% 5% 6% 43%	2183
	21st to end	Night	11% 8% 2 6% 3 4 5% 4 6% 7% 44%	2200
October	1st to 10th	Night	8% 10% 3 6% 3 4 5% 3 5% 8% 45%	3674
	11th to 20th	Night	8% 8% 2 8% 4 5% 5% 4 7% 9% 39%	4217
	21st to end	Night	8% 10% 5% 9% 5% 5% 5% 4 6% 7% 38%	4610
November	1st to 10th	Night	11% 14% 6% 13% 7% 5% 5% 3 5% 6% 26%	2731
	11th to 20th	Night	8% 15% 6% 14% 8% 7% 6% 4 5% 5% 23%	3046
	21st to end	Night	9% 10% 4 13% 10% 8% 5% 5% 5% 7% 23%	3150
December	1st to 10th	Night	5% 14% 6% 16% 10% 8% 6% 6% 7% 7% 14%	5050
	11th to 20th	Night	7% 12% 5% 13% 9% 7% 6% 5% 6% 7% 21%	5718
	21st to end	Night	5% 8% 3 12% 10% 7% 7% 4 7% 8% 29%	7645

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% 5% 10% 15% 9%	4125
	11th to 20th	Day	58% 5% 7% 21% 9% 1	4440
	21st to end	Day	49% 5% 10% 23% 12%	5188
February	1st to 10th	Day	54% 6% 14% 15% 10% 1	1680
	11th to 20th	Day	49% 8% 10% 20% 13%	1839
	21st to end	Day	52% 7% 13% 17% 11%	1730
March	1st to 10th	Day	53% 6% 12% 19% 9%	4600
	11th to 20th	Day	52% 7% 12% 19% 10% 1	4952
	21st to end	Day	49% 7% 10% 21% 12%	5772
April	1st to 10th	Day	49% 7% 13% 20% 10% 1	2533
	11th to 20th	Day	54% 7% 11% 17% 10% 1	2702
	21st to end	Day	46% 8% 13% 22% 9% 1	2730
May	1st to 10th	Day	41% 5% 12% 28% 12% 1	8026
	11th to 20th	Day	53% 6% 10% 22% 8% 1	8723
	21st to end	Day	39% 6% 9% 25% 20% 1	9683
June	1st to 10th	Day	48% 7% 14% 20% 9% 1	3150
	11th to 20th	Day	52% 7% 15% 17% 8% 1	3150
	21st to end	Day	48% 9% 15% 22% 6% 1	3150
July	1st to 10th	Day	40% 6% 24% 25% 4	6727
	11th to 20th	Day	39% 6% 18% 32% 5%	6719
	21st to end	Day	35% 5% 24% 29% 7%	6844
August	1st to 10th	Day	39% 5% 17% 29% 9%	4536
	11th to 20th	Day	35% 7% 21% 31% 6%	4303
	21st to end	Day	37% 5% 20% 31% 7%	4674
September	1st to 10th	Day	37% 7% 13% 29% 11% 1	2438
	11th to 20th	Day	45% 6% 16% 24% 8%	2216
	21st to end	Day	39% 6% 11% 33% 11%	2200
October	1st to 10th	Day	43% 4 12% 33% 8%	3473
	11th to 20th	Day	44% 5% 11% 32% 7%	2931
	21st to end	Day	54% 4 12% 22% 7%	3190
November	1st to 10th	Day	63% 3 10% 16% 7% 1	1785
	11th to 20th	Day	58% 5% 14% 14% 8% 1	1570
	21st to end	Day	58% 6% 11% 18% 6% 1	1470
December	1st to 10th	Day	67% 5% 13% 10% 4 1	2360
	11th to 20th	Day	63% 4 9% 15% 8%	2710
	21st to end	Day	48% 4 10% 18% 16% 3	3575
January	1st to 10th	Night	61% 6% 9% 14% 10%	8800
	11th to 20th	Night	61% 5% 7% 19% 7%	8533
	21st to end	Night	54% 6% 10% 20% 11%	9026
February	1st to 10th	Night	52% 8% 9% 17% 11% 2	2940
	11th to 20th	Night	43% 8% 11% 22% 15% 1	2697
	21st to end	Night	51% 4 10% 23% 12%	2076
March	1st to 10th	Night	51% 5% 12% 20% 11% 1	5494
	11th to 20th	Night	48% 6% 12% 18% 15% 1	5233
	21st to end	Night	51% 5% 8% 25% 10%	5396
April	1st to 10th	Night	40% 6% 12% 22% 17% 2	2086
	11th to 20th	Night	51% 5% 10% 20% 12% 2	1869
	21st to end	Night	48% 6% 11% 22% 10% 2	1890
May	1st to 10th	Night	41% 5% 12% 24% 17% 1	4918
	11th to 20th	Night	48% 4 14% 24% 9% 1	4172
	21st to end	Night	37% 6% 9% 25% 22% 1	4526
June	1st to 10th	Night	43% 7% 15% 23% 10% 1	1470
	11th to 20th	Night	41% 9% 15% 23% 10% 1	1470
	21st to end	Night	40% 9% 20% 24% 6% 1	1470
July	1st to 10th	Night	28% 6% 29% 31% 7%	3145
	11th to 20th	Night	30% 5% 19% 41% 6%	3138
	21st to end	Night	28% 5% 26% 31% 9%	3713
August	1st to 10th	Night	34% 5% 19% 28% 13%	2600
	11th to 20th	Night	32% 5% 25% 30% 7% 1	2820
	21st to end	Night	36% 5% 18% 32% 9%	3234
September	1st to 10th	Night	31% 7% 14% 34% 13% 2	1960
	11th to 20th	Night	42% 7% 14% 27% 10% 1	2183
	21st to end	Night	38% 7% 12% 29% 12% 2	2200
October	1st to 10th	Night	39% 5% 13% 26% 17% 1	3674
	11th to 20th	Night	42% 4 11% 30% 12% 1	4217
	21st to end	Night	47% 4 13% 30% 6%	4610
November	1st to 10th	Night	58% 5% 11% 16% 7% 2	2731
	11th to 20th	Night	61% 6% 13% 14% 5% 1	3046
	21st to end	Night	59% 6% 12% 16% 6%	3150
December	1st to 10th	Night	65% 5% 11% 12% 5% 1	5050
	11th to 20th	Night	59% 4 10% 15% 11% 1	5716
	21st to end	Night	49% 5% 11% 16% 15% 4	7645

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	7% 8% 39% 31% 13% 2	330
	11th to 20th	Day	7% 13% 38% 35% 6% 1	330
	21st to end	Day	12% 9% 34% 33% 9% 3	363
February	1st to 10th	Day	10% 12% 42% 26% 10% 1	330
	11th to 20th	Day	8% 14% 31% 27% 16% 3	330
	21st to end	Day	5% 13% 36% 32% 11% 2	273
March	1st to 10th	Day	14% 8% 37% 29% 11% 1	330
	11th to 20th	Day	9% 14% 34% 28% 13% 1	330
	21st to end	Day	15% 12% 32% 28% 9% 2	447
April	1st to 10th	Day	12% 14% 37% 28% 8% 1	553
	11th to 20th	Day	17% 13% 33% 26% 9% 1	740
	21st to end	Day	16% 12% 34% 26% 10% 1	750
May	1st to 10th	Day	14% 11% 32% 29% 12% 2	753
	11th to 20th	Day	18% 11% 32% 25% 11% 3	775
	21st to end	Day	18% 9% 27% 28% 15% 3	844
June	1st to 10th	Day	18% 14% 33% 20% 10% 5%	780
	11th to 20th	Day	19% 13% 31% 22% 12% 2	780
	21st to end	Day	15% 10% 26% 31% 14% 3	780
July	1st to 10th	Day	9% 9% 29% 30% 18% 6%	722
	11th to 20th	Day	13% 11% 30% 26% 16% 5%	718
	21st to end	Day	8% 9% 29% 30% 18% 6%	794
August	1st to 10th	Day	10% 8% 30% 29% 17% 5%	726
	11th to 20th	Day	12% 8% 27% 28% 19% 6%	715
	21st to end	Day	14% 10% 26% 32% 17% 2	803
September	1st to 10th	Day	13% 14% 34% 26% 12% 1	568
	11th to 20th	Day	19% 11% 32% 26% 10% 2	346
	21st to end	Day	16% 12% 35% 29% 8% 1	330
October	1st to 10th	Day	22% 12% 30% 24% 11% 2	330
	11th to 20th	Day	18% 14% 38% 22% 5% 2	330
	21st to end	Day	21% 14% 32% 24% 6% 3	363
November	1st to 10th	Day	23% 14% 28% 26% 7% 1	330
	11th to 20th	Day	15% 18% 38% 24% 5% 1	330
	21st to end	Day	13% 13% 39% 27% 7% 1	330
December	1st to 10th	Day	11% 12% 37% 28% 11% 2	330
	11th to 20th	Day	12% 15% 44% 23% 5% 1	330
	21st to end	Day	11% 6% 39% 28% 13% 4	363
January	1st to 10th	Night	10% 12% 38% 28% 10% 1	1050
	11th to 20th	Night	12% 13% 39% 28% 8% 1	1050
	21st to end	Night	12% 12% 40% 28% 7% 1	1155
February	1st to 10th	Night	14% 11% 34% 31% 9% 2	1050
	11th to 20th	Night	9% 9% 35% 34% 12% 1	1018
	21st to end	Night	9% 9% 34% 35% 11% 3	692
March	1st to 10th	Night	14% 10% 32% 32% 11% 1	840
	11th to 20th	Night	10% 11% 39% 29% 10% 1	695
	21st to end	Night	13% 8% 34% 30% 11% 3	693
April	1st to 10th	Night	11% 7% 36% 35% 10% 1	630
	11th to 20th	Night	17% 9% 32% 31% 9%	623
	21st to end	Night	16% 10% 33% 31% 9% 1	630
May	1st to 10th	Night	16% 8% 30% 36% 10% 1	630
	11th to 20th	Night	18% 8% 33% 29% 12% 1	621
	21st to end	Night	20% 7% 25% 35% 13%	683
June	1st to 10th	Night	14% 9% 32% 29% 14% 1	630
	11th to 20th	Night	16% 7% 30% 33% 13% 1	630
	21st to end	Night	15% 6% 28% 35% 16%	630
July	1st to 10th	Night	8% 5% 26% 42% 18% 1	585
	11th to 20th	Night	8% 6% 30% 37% 16% 2	582
	21st to end	Night	8% 5% 28% 38% 18% 4	657
August	1st to 10th	Night	9% 6% 25% 40% 18% 2	597
	11th to 20th	Night	11% 6% 24% 34% 22% 4	594
	21st to end	Night	15% 6% 27% 34% 16% 1	660
September	1st to 10th	Night	10% 6% 32% 34% 17% 1	600
	11th to 20th	Night	18% 7% 32% 33% 10% 1	600
	21st to end	Night	14% 8% 33% 33% 11% 1	600
October	1st to 10th	Night	18% 10% 33% 30% 8% 1	645
	11th to 20th	Night	18% 11% 32% 29% 8% 1	990
	21st to end	Night	17% 13% 37% 25% 7% 1	1100
November	1st to 10th	Night	18% 13% 37% 23% 8% 1	1025
	11th to 20th	Night	14% 13% 41% 24% 7% 1	1050
	21st to end	Night	13% 15% 40% 26% 5% 1	1050
December	1st to 10th	Night	10% 10% 38% 29% 11% 2	1050
	11th to 20th	Night	14% 14% 37% 25% 9% 1	1050
	21st to end	Night	13% 9% 35% 30% 11% 2	1155

Page generated at 2026-06-28 01:10:46. Version ac07

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