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 2024-02-05.

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	11% 9% 4 8% 7% 4 5% 6% 6% 8% 33%	77727
	Night	9% 9% 4 9% 8% 4 6% 6% 6% 8% 32%	81123
Transparency	Day	48% 7% 13% 21% 9% 1	77439
	Night	48% 7% 13% 21% 10% 1	80992
Seeing	Day	14% 11% 32% 28% 13% 3	15141
	Night	13% 9% 34% 31% 11% 1	25281

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	4 15% 7% 12% 9% 6% 5% 8% 7% 9% 17%	2219
	11th to 20th	Day	4 7% 5% 13% 13% 6% 7% 11% 10% 9% 15%	2357
	21st to end	Day	6% 11% 5% 11% 10% 6% 7% 5% 6% 8% 25%	2794
February	1st to 10th	Day	7% 9% 5% 9% 11% 4 7% 7% 6% 13% 21%	1472
	11th to 20th	Day	5% 9% 5% 8% 9% 6% 8% 8% 7% 8% 27%	1561
	21st to end	Day	6% 9% 6% 10% 8% 5% 7% 7% 8% 9% 24%	1480
March	1st to 10th	Day	11% 12% 5% 12% 8% 5% 7% 6% 5% 8% 21%	1800
	11th to 20th	Day	7% 9% 6% 11% 9% 5% 6% 5% 5% 8% 29%	1921
	21st to end	Day	10% 10% 5% 9% 8% 5% 6% 6% 7% 8% 27%	2250
April	1st to 10th	Day	7% 10% 4 8% 7% 5% 6% 6% 6% 8% 34%	2170
	11th to 20th	Day	12% 12% 4 8% 6% 4 5% 6% 4 7% 31%	2312
	21st to end	Day	13% 8% 3 6% 6% 3 6% 6% 5% 6% 37%	2340
May	1st to 10th	Day	14% 10% 3 6% 6% 4 5% 5% 5% 6% 36%	2452
	11th to 20th	Day	13% 9% 3 5% 5% 3 4 5% 6% 8% 39%	2629
	21st to end	Day	19% 10% 4 6% 6% 2 5% 5% 4 7% 31%	2918
June	1st to 10th	Day	15% 7% 3 6% 6% 3 5% 6% 5% 9% 34%	2700
	11th to 20th	Day	19% 7% 3 6% 6% 4 5% 5% 5% 8% 31%	2700
	21st to end	Day	12% 7% 3 6% 6% 4 7% 7% 7% 9% 33%	2700
July	1st to 10th	Day	8% 4 2 5% 6% 3 5% 6% 6% 8% 46%	2700
	11th to 20th	Day	11% 5% 2 5% 5% 3 6% 6% 7% 9% 41%	2700
	21st to end	Day	8% 4 2 5% 5% 3 5% 6% 7% 9% 47%	2801
August	1st to 10th	Day	10% 6% 2 5% 6% 3 5% 5% 6% 7% 44%	2507
	11th to 20th	Day	12% 5% 2 4 4 4 5% 6% 7% 9% 42%	2353
	21st to end	Day	13% 6% 3 5% 4 2 4 3 5% 8% 47%	2574
September	1st to 10th	Day	12% 5% 3 6% 6% 3 4 4 6% 7% 45%	2195
	11th to 20th	Day	15% 7% 3 5% 4 3 4 5% 6% 7% 40%	1995
	21st to end	Day	14% 7% 3 5% 5% 3 4 4 6% 7% 42%	1980
October	1st to 10th	Day	17% 13% 3 7% 4 3 4 4 4 9% 32%	1922
	11th to 20th	Day	13% 13% 5% 8% 5% 4 5% 4 4 7% 33%	1629
	21st to end	Day	12% 16% 7% 11% 7% 3 5% 5% 5% 6% 23%	1782
November	1st to 10th	Day	17% 13% 8% 10% 10% 4 4 4 4 5% 22%	1612
	11th to 20th	Day	9% 12% 6% 13% 10% 6% 7% 5% 5% 5% 22%	1421
	21st to end	Day	8% 13% 7% 12% 9% 4 6% 4 6% 8% 24%	1330
December	1st to 10th	Day	5% 11% 6% 11% 12% 6% 8% 7% 7% 8% 19%	1330
	11th to 20th	Day	9% 13% 6% 16% 11% 5% 6% 5% 6% 6% 17%	1679
	21st to end	Day	5% 8% 3 7% 8% 4 5% 5% 6% 8% 41%	2442
January	1st to 10th	Night	5% 11% 6% 13% 10% 5% 8% 9% 8% 8% 19%	4737
	11th to 20th	Night	4 8% 5% 15% 14% 6% 9% 9% 8% 10% 13%	4548
	21st to end	Night	6% 9% 6% 15% 11% 6% 6% 6% 6% 6% 22%	4873
February	1st to 10th	Night	8% 10% 5% 8% 7% 4 8% 6% 8% 11% 24%	2583
	11th to 20th	Night	6% 7% 3 8% 8% 5% 7% 8% 8% 10% 31%	2302
	21st to end	Night	7% 7% 5% 10% 10% 5% 7% 6% 6% 7% 30%	1776
March	1st to 10th	Night	11% 10% 4 10% 8% 5% 7% 7% 7% 8% 23%	2160
	11th to 20th	Night	6% 8% 4 8% 7% 4 6% 5% 7% 8% 36%	2036
	21st to end	Night	10% 10% 5% 9% 7% 4 5% 5% 5% 6% 34%	2106
April	1st to 10th	Night	5% 9% 4 7% 5% 4 5% 5% 6% 9% 40%	1789
	11th to 20th	Night	12% 11% 5% 8% 7% 3 5% 6% 6% 5% 33%	1599
	21st to end	Night	13% 9% 3 7% 6% 4 5% 7% 5% 6% 35%	1620
May	1st to 10th	Night	15% 9% 3 6% 5% 3 4 6% 6% 6% 37%	1504
	11th to 20th	Night	14% 8% 2 5% 4 3 4 5% 6% 8% 41%	1265
	21st to end	Night	16% 8% 3 5% 5% 3 5% 5% 5% 7% 37%	1358
June	1st to 10th	Night	14% 6% 3 6% 6% 3 4 5% 6% 8% 40%	1260
	11th to 20th	Night	15% 6% 2 5% 5% 3 5% 5% 7% 8% 39%	1260
	21st to end	Night	11% 4 3 5% 5% 3 6% 7% 7% 9% 40%	1260
July	1st to 10th	Night	7% 3 1 4 3 2 5% 5% 6% 7% 57%	1260
	11th to 20th	Night	7% 4 2 4 6% 3 3 5% 5% 8% 53%	1260
	21st to end	Night	7% 4 1 4 4 2 4 4 5% 8% 57%	1513
August	1st to 10th	Night	6% 3 2 3 5% 3 4 6% 6% 7% 55%	1432
	11th to 20th	Night	8% 3 2 4 5% 3 4 4 6% 8% 52%	1546
	21st to end	Night	12% 6% 2 4 3 3 3 3 4 8% 53%	1782
September	1st to 10th	Night	9% 5% 2 4 3 2 4 5% 7% 7% 52%	1764
	11th to 20th	Night	13% 7% 3 5% 5% 2 5% 5% 5% 6% 45%	1964
	21st to end	Night	12% 8% 3 6% 4 3 5% 5% 6% 8% 41%	1980
October	1st to 10th	Night	12% 12% 4 7% 5% 3 5% 4 5% 6% 38%	2020
	11th to 20th	Night	12% 11% 3 7% 5% 3 5% 5% 5% 7% 37%	2330
	21st to end	Night	11% 11% 6% 9% 6% 4 5% 5% 5% 6% 31%	2574
November	1st to 10th	Night	12% 13% 7% 11% 9% 4 5% 4 5% 6% 25%	2464
	11th to 20th	Night	8% 13% 7% 13% 10% 6% 6% 5% 5% 5% 23%	2755
	21st to end	Night	10% 10% 5% 11% 11% 6% 6% 6% 5% 7% 25%	2850
December	1st to 10th	Night	5% 10% 5% 10% 10% 6% 8% 7% 8% 9% 20%	2850
	11th to 20th	Night	8% 12% 6% 13% 12% 6% 6% 7% 6% 6% 17%	3518
	21st to end	Night	6% 7% 4 8% 8% 5% 6% 6% 6% 9% 36%	5225

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	59% 9% 11% 18% 4	2219
	11th to 20th	Day	57% 8% 9% 21% 5% 1	2380
	21st to end	Day	51% 8% 7% 23% 9%	2794
February	1st to 10th	Day	51% 7% 15% 16% 10%	1472
	11th to 20th	Day	50% 9% 10% 18% 13% 1	1570
	21st to end	Day	50% 7% 14% 18% 11%	1480
March	1st to 10th	Day	59% 8% 11% 14% 7% 1	1800
	11th to 20th	Day	52% 8% 11% 19% 10% 1	1923
	21st to end	Day	55% 7% 12% 17% 9%	2250
April	1st to 10th	Day	50% 7% 12% 19% 11% 1	2170
	11th to 20th	Day	53% 7% 11% 17% 11% 1	2312
	21st to end	Day	47% 8% 15% 20% 9% 2	2340
May	1st to 10th	Day	48% 7% 11% 22% 11% 1	2452
	11th to 20th	Day	44% 7% 12% 24% 11% 1	2633
	21st to end	Day	54% 6% 11% 20% 9% 1	2918
June	1st to 10th	Day	48% 8% 15% 20% 8% 1	2700
	11th to 20th	Day	52% 8% 15% 15% 9% 1	2700
	21st to end	Day	47% 10% 16% 22% 6% 1	2700
July	1st to 10th	Day	34% 9% 21% 27% 9%	2626
	11th to 20th	Day	37% 10% 16% 27% 10% 1	2619
	21st to end	Day	33% 8% 18% 32% 8%	2645
August	1st to 10th	Day	38% 7% 18% 29% 8%	2491
	11th to 20th	Day	36% 10% 20% 27% 7%	2353
	21st to end	Day	37% 6% 16% 30% 10% 1	2574
September	1st to 10th	Day	38% 7% 13% 27% 12% 1	2195
	11th to 20th	Day	43% 7% 17% 24% 9%	1995
	21st to end	Day	41% 6% 11% 32% 9%	1980
October	1st to 10th	Day	52% 6% 13% 21% 7%	1922
	11th to 20th	Day	51% 7% 11% 23% 8% 1	1629
	21st to end	Day	61% 6% 12% 14% 6% 1	1782
November	1st to 10th	Day	64% 3 10% 15% 7% 1	1612
	11th to 20th	Day	59% 6% 14% 13% 8% 1	1421
	21st to end	Day	58% 6% 12% 18% 6%	1330
December	1st to 10th	Day	58% 7% 15% 13% 6% 1	1330
	11th to 20th	Day	65% 6% 10% 13% 5% 1	1680
	21st to end	Day	39% 5% 14% 18% 19% 5%	2442
January	1st to 10th	Night	53% 9% 14% 16% 8%	4737
	11th to 20th	Night	60% 7% 10% 18% 6%	4587
	21st to end	Night	54% 9% 10% 18% 9%	4873
February	1st to 10th	Night	49% 9% 10% 18% 12% 2	2583
	11th to 20th	Night	45% 8% 11% 20% 15% 1	2303
	21st to end	Night	50% 4 10% 23% 13% 1	1776
March	1st to 10th	Night	54% 7% 12% 18% 8% 1	2160
	11th to 20th	Night	44% 7% 13% 23% 12% 2	2036
	21st to end	Night	51% 7% 12% 19% 10% 1	2106
April	1st to 10th	Night	41% 6% 12% 21% 17% 3	1789
	11th to 20th	Night	51% 6% 10% 20% 12% 2	1599
	21st to end	Night	48% 7% 12% 21% 10% 2	1620
May	1st to 10th	Night	47% 6% 11% 22% 13%	1504
	11th to 20th	Night	41% 5% 12% 26% 15% 1	1265
	21st to end	Night	47% 6% 12% 22% 12% 1	1358
June	1st to 10th	Night	42% 8% 16% 24% 9% 1	1260
	11th to 20th	Night	41% 10% 15% 22% 10% 1	1260
	21st to end	Night	38% 10% 21% 25% 5% 1	1260
July	1st to 10th	Night	24% 7% 21% 34% 13% 1	1225
	11th to 20th	Night	30% 8% 19% 29% 13% 1	1218
	21st to end	Night	27% 7% 20% 34% 11% 1	1429
August	1st to 10th	Night	27% 8% 19% 33% 13%	1424
	11th to 20th	Night	30% 7% 20% 33% 9% 1	1546
	21st to end	Night	32% 6% 13% 35% 13% 1	1782
September	1st to 10th	Night	30% 7% 15% 32% 13% 2	1764
	11th to 20th	Night	39% 7% 13% 29% 11% 1	1964
	21st to end	Night	41% 7% 12% 29% 11% 1	1980
October	1st to 10th	Night	47% 7% 14% 23% 9%	2020
	11th to 20th	Night	47% 6% 11% 27% 10%	2330
	21st to end	Night	53% 6% 12% 23% 6% 1	2574
November	1st to 10th	Night	59% 5% 11% 15% 7% 2	2464
	11th to 20th	Night	61% 6% 13% 14% 5% 1	2755
	21st to end	Night	58% 6% 13% 16% 6%	2850
December	1st to 10th	Night	54% 7% 14% 16% 8% 1	2850
	11th to 20th	Night	62% 5% 12% 13% 6% 1	3516
	21st to end	Night	41% 6% 15% 16% 16% 6%	5225

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	9% 9% 38% 29% 14% 2	270
	11th to 20th	Day	6% 11% 38% 38% 7% 1	270
	21st to end	Day	12% 8% 30% 36% 11% 3	297
February	1st to 10th	Day	9% 9% 45% 27% 9% 1	252
	11th to 20th	Day	8% 14% 35% 25% 14% 4	240
	21st to end	Day	4 9% 36% 35% 14% 3	198
March	1st to 10th	Day	14% 7% 34% 34% 10% 2	240
	11th to 20th	Day	10% 12% 31% 32% 15%	240
	21st to end	Day	14% 13% 32% 29% 10% 2	336
April	1st to 10th	Day	12% 15% 39% 26% 7% 1	430
	11th to 20th	Day	18% 11% 33% 27% 10% 2	590
	21st to end	Day	16% 11% 36% 27% 10% 1	600
May	1st to 10th	Day	15% 11% 31% 30% 12% 2	603
	11th to 20th	Day	17% 9% 31% 26% 13% 4	625
	21st to end	Day	20% 9% 27% 28% 14% 3	679
June	1st to 10th	Day	17% 12% 33% 22% 11% 6%	630
	11th to 20th	Day	20% 14% 30% 21% 13% 2	630
	21st to end	Day	13% 9% 27% 32% 16% 3	630
July	1st to 10th	Day	9% 10% 28% 32% 17% 4	621
	11th to 20th	Day	13% 12% 30% 26% 16% 4	618
	21st to end	Day	7% 9% 29% 30% 19% 6%	684
August	1st to 10th	Day	10% 8% 31% 29% 18% 5%	626
	11th to 20th	Day	12% 9% 25% 28% 20% 6%	615
	21st to end	Day	15% 9% 25% 32% 17% 2	693
September	1st to 10th	Day	13% 14% 36% 26% 10% 1	485
	11th to 20th	Day	18% 11% 31% 27% 11% 2	285
	21st to end	Day	17% 11% 34% 30% 7% 1	270
October	1st to 10th	Day	24% 10% 27% 25% 10% 3	270
	11th to 20th	Day	17% 11% 39% 24% 6% 3	270
	21st to end	Day	21% 15% 31% 24% 6% 3	297
November	1st to 10th	Day	22% 13% 29% 28% 7% 1	270
	11th to 20th	Day	13% 18% 38% 26% 6% 1	270
	21st to end	Day	15% 13% 40% 26% 6%	270
December	1st to 10th	Day	10% 10% 36% 28% 13% 3	270
	11th to 20th	Day	11% 13% 44% 25% 6% 1	270
	21st to end	Day	11% 4 38% 30% 12% 5%	297
January	1st to 10th	Night	10% 13% 38% 28% 10% 1	950
	11th to 20th	Night	12% 11% 39% 29% 9% 1	950
	21st to end	Night	13% 11% 39% 29% 7% 1	1045
February	1st to 10th	Night	14% 9% 35% 32% 9% 2	923
	11th to 20th	Night	9% 10% 37% 33% 11% 1	870
	21st to end	Night	9% 8% 32% 36% 12% 3	592
March	1st to 10th	Night	14% 9% 31% 32% 12% 2	720
	11th to 20th	Night	10% 10% 37% 30% 12% 1	596
	21st to end	Night	14% 8% 34% 30% 12% 3	594
April	1st to 10th	Night	11% 7% 36% 34% 10% 1	540
	11th to 20th	Night	17% 8% 32% 32% 10% 1	533
	21st to end	Night	16% 9% 34% 31% 8% 1	540
May	1st to 10th	Night	18% 6% 30% 36% 9% 1	540
	11th to 20th	Night	17% 7% 31% 31% 13% 1	531
	21st to end	Night	21% 7% 24% 35% 12%	584
June	1st to 10th	Night	14% 8% 32% 29% 16% 1	540
	11th to 20th	Night	15% 7% 32% 32% 14% 1	540
	21st to end	Night	14% 5% 29% 35% 18%	540
July	1st to 10th	Night	8% 6% 25% 43% 18% 1	525
	11th to 20th	Night	8% 7% 32% 35% 17% 1	522
	21st to end	Night	8% 5% 28% 38% 18% 4	591
August	1st to 10th	Night	8% 5% 26% 40% 18% 2	537
	11th to 20th	Night	10% 6% 23% 35% 22% 4	534
	21st to end	Night	16% 6% 26% 35% 16% 1	594
September	1st to 10th	Night	11% 6% 32% 34% 16% 1	540
	11th to 20th	Night	17% 7% 34% 33% 9% 1	540
	21st to end	Night	15% 7% 34% 32% 11% 1	540
October	1st to 10th	Night	19% 9% 33% 30% 9% 1	580
	11th to 20th	Night	17% 11% 32% 30% 9% 1	890
	21st to end	Night	17% 12% 37% 25% 7% 2	990
November	1st to 10th	Night	18% 13% 37% 23% 8% 1	925
	11th to 20th	Night	14% 13% 41% 24% 7% 1	950
	21st to end	Night	14% 15% 39% 26% 5%	950
December	1st to 10th	Night	10% 10% 37% 29% 12% 3	950
	11th to 20th	Night	14% 13% 37% 26% 10% 1	950
	21st to end	Night	14% 9% 34% 30% 11% 2	1045

Page generated at 2024-02-02 04:20:29. Version ac07

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