Minnedosa
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Minnedosa 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	10% 8% 4 7% 6% 4 5% 5% 6% 8% 36%	77745
	Night	9% 8% 4 8% 7% 4 5% 5% 6% 8% 37%	81107
Transparency	Day	45% 7% 15% 23% 9% 1	77459
	Night	44% 7% 14% 23% 11% 1	80974
Seeing	Day	14% 8% 31% 29% 14% 4	15123
	Night	13% 8% 32% 32% 13% 2	25258

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	5% 15% 7% 11% 9% 4 6% 6% 7% 7% 24%	2219
	11th to 20th	Day	3 8% 6% 15% 14% 5% 5% 6% 6% 8% 24%	2384
	21st to end	Day	8% 9% 5% 10% 10% 4 5% 6% 5% 8% 30%	2794
February	1st to 10th	Day	8% 11% 4 10% 8% 4 5% 5% 6% 11% 28%	1472
	11th to 20th	Day	5% 9% 4 9% 8% 3 8% 6% 6% 8% 34%	1579
	21st to end	Day	8% 9% 5% 7% 8% 4 7% 7% 7% 9% 30%	1480
March	1st to 10th	Day	11% 11% 6% 12% 9% 4 5% 5% 5% 8% 24%	1800
	11th to 20th	Day	7% 10% 4 10% 7% 4 6% 7% 6% 8% 31%	1927
	21st to end	Day	11% 10% 5% 10% 7% 4 6% 4 7% 7% 30%	2240
April	1st to 10th	Day	8% 9% 3 8% 5% 4 4 5% 6% 8% 39%	2168
	11th to 20th	Day	12% 10% 5% 9% 7% 4 6% 6% 5% 7% 32%	2312
	21st to end	Day	13% 8% 3 5% 5% 3 6% 5% 6% 8% 37%	2340
May	1st to 10th	Day	14% 9% 3 6% 6% 3 4 4 5% 7% 39%	2433
	11th to 20th	Day	16% 7% 3 6% 5% 3 4 5% 6% 7% 38%	2619
	21st to end	Day	19% 9% 4 6% 5% 3 4 5% 5% 9% 32%	2918
June	1st to 10th	Day	14% 6% 2 5% 6% 4 6% 6% 6% 8% 37%	2700
	11th to 20th	Day	16% 6% 3 6% 6% 4 5% 5% 6% 7% 34%	2700
	21st to end	Day	10% 6% 3 6% 6% 4 6% 6% 7% 10% 36%	2700
July	1st to 10th	Day	7% 3 2 5% 5% 3 6% 5% 7% 10% 46%	2700
	11th to 20th	Day	9% 4 2 4 5% 3 6% 6% 8% 10% 43%	2700
	21st to end	Day	6% 3 2 5% 4 3 4 6% 8% 9% 50%	2786
August	1st to 10th	Day	9% 4 2 5% 5% 4 5% 6% 7% 8% 45%	2507
	11th to 20th	Day	10% 3 2 6% 6% 3 6% 6% 7% 9% 44%	2340
	21st to end	Day	10% 5% 2 5% 5% 3 4 5% 5% 8% 48%	2574
September	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 4 6% 8% 46%	2194
	11th to 20th	Day	12% 6% 3 6% 5% 3 4 5% 4 8% 44%	1990
	21st to end	Day	14% 6% 2 4 5% 2 5% 5% 6% 8% 43%	1980
October	1st to 10th	Day	15% 10% 4 7% 5% 3 4 3 5% 8% 35%	1922
	11th to 20th	Day	11% 9% 3 7% 6% 4 5% 4 6% 9% 37%	1638
	21st to end	Day	13% 13% 5% 9% 6% 4 5% 5% 5% 8% 29%	1782
November	1st to 10th	Day	17% 10% 5% 8% 7% 3 5% 5% 5% 6% 29%	1622
	11th to 20th	Day	8% 11% 5% 9% 9% 4 5% 6% 6% 8% 29%	1444
	21st to end	Day	9% 14% 6% 7% 7% 3 4 4 6% 7% 32%	1330
December	1st to 10th	Day	6% 9% 7% 12% 9% 4 7% 6% 7% 9% 23%	1330
	11th to 20th	Day	8% 14% 5% 14% 9% 5% 6% 5% 7% 8% 19%	1679
	21st to end	Day	6% 7% 3 7% 6% 3 5% 4 6% 7% 45%	2442
January	1st to 10th	Night	6% 11% 5% 9% 8% 4 6% 5% 6% 8% 30%	4737
	11th to 20th	Night	5% 8% 5% 16% 15% 6% 6% 5% 6% 8% 22%	4520
	21st to end	Night	7% 11% 6% 15% 9% 4 4 4 5% 7% 28%	4873
February	1st to 10th	Night	7% 11% 4 9% 7% 4 6% 5% 5% 8% 33%	2583
	11th to 20th	Night	6% 7% 3 7% 7% 4 6% 5% 7% 9% 38%	2281
	21st to end	Night	7% 7% 4 9% 8% 3 5% 6% 6% 8% 38%	1776
March	1st to 10th	Night	11% 9% 5% 9% 7% 4 6% 5% 6% 8% 29%	2160
	11th to 20th	Night	6% 7% 5% 8% 6% 3 6% 5% 6% 8% 40%	2030
	21st to end	Night	12% 11% 5% 7% 6% 3 6% 5% 5% 7% 35%	2114
April	1st to 10th	Night	7% 6% 3 7% 7% 3 5% 5% 6% 7% 44%	1791
	11th to 20th	Night	12% 10% 4 8% 6% 3 4 5% 6% 8% 33%	1599
	21st to end	Night	11% 10% 3 6% 6% 4 5% 6% 5% 8% 36%	1620
May	1st to 10th	Night	13% 8% 2 5% 5% 2 5% 5% 6% 8% 41%	1526
	11th to 20th	Night	14% 6% 2 5% 5% 3 4 4 6% 9% 42%	1277
	21st to end	Night	15% 8% 3 4 6% 3 4 5% 5% 7% 39%	1358
June	1st to 10th	Night	12% 5% 2 5% 5% 3 4 5% 8% 8% 42%	1260
	11th to 20th	Night	13% 7% 2 4 4 3 5% 5% 7% 9% 41%	1260
	21st to end	Night	10% 5% 3 5% 5% 2 6% 5% 7% 10% 42%	1260
July	1st to 10th	Night	7% 3 1 3 3 2 3 5% 7% 9% 57%	1260
	11th to 20th	Night	7% 3 2 2 5% 3 5% 5% 7% 6% 53%	1260
	21st to end	Night	4 4 1 4 4 3 4 4 6% 7% 59%	1530
August	1st to 10th	Night	6% 3 1 4 4 3 4 5% 6% 10% 54%	1432
	11th to 20th	Night	7% 3 2 4 4 2 4 5% 6% 8% 54%	1561
	21st to end	Night	10% 5% 1 3 4 2 3 4 5% 8% 54%	1782
September	1st to 10th	Night	8% 5% 2 4 4 3 3 4 6% 8% 54%	1764
	11th to 20th	Night	11% 6% 2 4 5% 2 4 5% 6% 8% 47%	1970
	21st to end	Night	11% 8% 3 6% 5% 2 4 4 5% 8% 43%	1980
October	1st to 10th	Night	12% 10% 4 6% 5% 3 4 4 5% 8% 39%	2020
	11th to 20th	Night	11% 9% 3 6% 6% 3 5% 4 5% 8% 41%	2318
	21st to end	Night	10% 9% 5% 7% 6% 3 6% 5% 5% 7% 35%	2574
November	1st to 10th	Night	11% 11% 5% 7% 6% 3 5% 6% 6% 7% 33%	2455
	11th to 20th	Night	8% 12% 5% 10% 7% 4 5% 5% 5% 8% 31%	2733
	21st to end	Night	10% 9% 5% 9% 8% 3 5% 4 4 7% 35%	2850
December	1st to 10th	Night	7% 9% 5% 9% 9% 4 6% 6% 7% 9% 29%	2850
	11th to 20th	Night	9% 13% 6% 11% 9% 5% 6% 5% 6% 8% 23%	3518
	21st to end	Night	6% 8% 3 6% 7% 4 5% 5% 6% 8% 41%	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	57% 8% 13% 17% 5%	2219
	11th to 20th	Day	56% 5% 13% 21% 4	2408
	21st to end	Day	52% 6% 9% 24% 9%	2794
February	1st to 10th	Day	51% 5% 15% 19% 8%	1472
	11th to 20th	Day	45% 7% 14% 20% 13% 1	1588
	21st to end	Day	48% 5% 15% 21% 11%	1480
March	1st to 10th	Day	58% 6% 11% 17% 8%	1800
	11th to 20th	Day	48% 8% 13% 21% 9%	1929
	21st to end	Day	52% 7% 12% 18% 10%	2240
April	1st to 10th	Day	42% 6% 15% 23% 13% 1	2168
	11th to 20th	Day	51% 6% 12% 18% 11% 1	2312
	21st to end	Day	45% 7% 17% 22% 9% 1	2340
May	1st to 10th	Day	45% 6% 13% 24% 11% 1	2433
	11th to 20th	Day	44% 6% 12% 25% 12% 1	2623
	21st to end	Day	49% 7% 12% 22% 9% 1	2918
June	1st to 10th	Day	43% 8% 17% 22% 8% 1	2700
	11th to 20th	Day	48% 8% 16% 17% 9% 1	2700
	21st to end	Day	42% 10% 17% 25% 6% 1	2700
July	1st to 10th	Day	31% 10% 20% 30% 9%	2626
	11th to 20th	Day	33% 10% 18% 28% 10% 1	2619
	21st to end	Day	28% 9% 19% 33% 10%	2631
August	1st to 10th	Day	35% 10% 17% 29% 10%	2491
	11th to 20th	Day	35% 10% 19% 30% 7%	2340
	21st to end	Day	34% 7% 17% 33% 10% 1	2574
September	1st to 10th	Day	35% 7% 15% 30% 11% 1	2194
	11th to 20th	Day	39% 7% 17% 27% 9% 1	1990
	21st to end	Day	39% 7% 13% 32% 9%	1980
October	1st to 10th	Day	49% 6% 13% 24% 8%	1922
	11th to 20th	Day	44% 6% 14% 26% 9% 1	1638
	21st to end	Day	55% 6% 13% 19% 6% 1	1782
November	1st to 10th	Day	56% 7% 12% 19% 6% 1	1622
	11th to 20th	Day	52% 7% 16% 18% 6% 1	1444
	21st to end	Day	51% 6% 15% 22% 7%	1330
December	1st to 10th	Day	55% 9% 14% 15% 6%	1330
	11th to 20th	Day	60% 8% 11% 15% 6% 1	1680
	21st to end	Day	37% 6% 17% 19% 17% 3	2442
January	1st to 10th	Night	50% 8% 12% 21% 8%	4737
	11th to 20th	Night	59% 7% 10% 18% 6%	4558
	21st to end	Night	56% 5% 10% 21% 8%	4873
February	1st to 10th	Night	49% 6% 12% 20% 12% 2	2583
	11th to 20th	Night	42% 7% 14% 21% 15% 1	2282
	21st to end	Night	43% 6% 11% 26% 14%	1776
March	1st to 10th	Night	51% 6% 14% 20% 8%	2160
	11th to 20th	Night	41% 6% 14% 26% 12% 1	2030
	21st to end	Night	48% 8% 14% 20% 11%	2114
April	1st to 10th	Night	38% 6% 11% 23% 19% 3	1791
	11th to 20th	Night	49% 5% 11% 20% 13% 1	1599
	21st to end	Night	45% 7% 12% 22% 11% 2	1620
May	1st to 10th	Night	41% 7% 14% 23% 14%	1526
	11th to 20th	Night	39% 7% 11% 25% 15% 2	1277
	21st to end	Night	44% 7% 13% 22% 13% 1	1358
June	1st to 10th	Night	36% 8% 19% 25% 10% 2	1260
	11th to 20th	Night	37% 8% 19% 23% 11% 2	1260
	21st to end	Night	35% 11% 19% 28% 6% 1	1260
July	1st to 10th	Night	22% 8% 21% 34% 14% 1	1225
	11th to 20th	Night	27% 8% 20% 30% 14% 1	1218
	21st to end	Night	23% 7% 19% 38% 12% 2	1445
August	1st to 10th	Night	25% 9% 19% 33% 13% 1	1424
	11th to 20th	Night	27% 9% 19% 34% 10% 1	1561
	21st to end	Night	29% 6% 13% 36% 14% 1	1782
September	1st to 10th	Night	28% 6% 16% 34% 14% 2	1764
	11th to 20th	Night	34% 7% 16% 30% 12% 1	1970
	21st to end	Night	39% 7% 12% 31% 10% 1	1980
October	1st to 10th	Night	44% 8% 15% 24% 9%	2020
	11th to 20th	Night	41% 6% 12% 30% 10% 1	2318
	21st to end	Night	47% 7% 13% 26% 7%	2574
November	1st to 10th	Night	50% 7% 14% 19% 8% 2	2455
	11th to 20th	Night	52% 8% 14% 18% 7% 1	2733
	21st to end	Night	49% 6% 17% 20% 7%	2850
December	1st to 10th	Night	51% 8% 15% 18% 8% 1	2850
	11th to 20th	Night	59% 6% 14% 14% 6% 1	3516
	21st to end	Night	40% 6% 14% 20% 16% 4	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	11% 9% 37% 26% 15% 2	270
	11th to 20th	Day	8% 7% 38% 33% 12% 2	270
	21st to end	Day	15% 7% 28% 32% 14% 3	297
February	1st to 10th	Day	13% 6% 45% 28% 6% 3	252
	11th to 20th	Day	8% 13% 33% 30% 14% 3	240
	21st to end	Day	7% 7% 38% 25% 20% 3	198
March	1st to 10th	Day	15% 9% 31% 32% 11% 2	240
	11th to 20th	Day	14% 5% 35% 31% 12% 3	240
	21st to end	Day	15% 5% 33% 31% 13% 4	326
April	1st to 10th	Day	12% 10% 33% 31% 11% 3	428
	11th to 20th	Day	18% 8% 31% 27% 14% 2	590
	21st to end	Day	14% 8% 35% 28% 13% 2	600
May	1st to 10th	Day	17% 7% 28% 28% 18% 2	603
	11th to 20th	Day	19% 8% 29% 24% 16% 5%	625
	21st to end	Day	20% 9% 25% 29% 15% 4	679
June	1st to 10th	Day	16% 9% 31% 24% 12% 7%	630
	11th to 20th	Day	19% 11% 30% 24% 12% 4	630
	21st to end	Day	12% 7% 28% 33% 18% 3	630
July	1st to 10th	Day	9% 5% 27% 35% 18% 7%	621
	11th to 20th	Day	10% 9% 30% 28% 18% 5%	618
	21st to end	Day	8% 5% 27% 33% 20% 7%	684
August	1st to 10th	Day	10% 5% 29% 31% 19% 6%	626
	11th to 20th	Day	12% 5% 25% 31% 19% 8%	615
	21st to end	Day	12% 7% 26% 34% 17% 4	693
September	1st to 10th	Day	12% 12% 37% 27% 11% 2	484
	11th to 20th	Day	19% 7% 31% 31% 10% 3	280
	21st to end	Day	20% 11% 29% 29% 9% 1	270
October	1st to 10th	Day	21% 11% 23% 34% 8% 4	270
	11th to 20th	Day	15% 10% 38% 26% 8% 3	270
	21st to end	Day	20% 10% 36% 22% 9% 3	297
November	1st to 10th	Day	26% 9% 29% 24% 10% 2	270
	11th to 20th	Day	14% 14% 34% 27% 9% 1	270
	21st to end	Day	15% 14% 34% 29% 7% 1	270
December	1st to 10th	Day	12% 11% 37% 24% 12% 3	270
	11th to 20th	Day	14% 11% 43% 23% 7% 1	270
	21st to end	Day	11% 7% 36% 31% 11% 3	297
January	1st to 10th	Night	13% 10% 36% 29% 11% 1	950
	11th to 20th	Night	11% 10% 39% 29% 10% 1	950
	21st to end	Night	13% 11% 38% 28% 10% 1	1045
February	1st to 10th	Night	13% 11% 34% 28% 11% 2	923
	11th to 20th	Night	10% 10% 34% 32% 12% 2	865
	21st to end	Night	10% 9% 29% 33% 14% 4	592
March	1st to 10th	Night	16% 8% 30% 31% 13% 2	720
	11th to 20th	Night	10% 9% 34% 31% 13% 3	590
	21st to end	Night	18% 4 30% 29% 15% 3	594
April	1st to 10th	Night	10% 7% 35% 33% 13% 2	540
	11th to 20th	Night	16% 7% 30% 35% 10% 2	533
	21st to end	Night	16% 6% 31% 34% 10% 2	540
May	1st to 10th	Night	18% 8% 27% 34% 12% 1	540
	11th to 20th	Night	17% 6% 31% 30% 16% 1	531
	21st to end	Night	19% 7% 24% 36% 14% 1	584
June	1st to 10th	Night	14% 8% 30% 30% 16% 2	540
	11th to 20th	Night	16% 4 32% 31% 16% 1	540
	21st to end	Night	12% 4 25% 40% 19% 1	540
July	1st to 10th	Night	8% 3 22% 44% 22% 1	525
	11th to 20th	Night	8% 6% 28% 37% 19% 2	522
	21st to end	Night	6% 4 24% 41% 24% 2	591
August	1st to 10th	Night	8% 3 23% 43% 20% 3	537
	11th to 20th	Night	9% 3 21% 38% 24% 5%	534
	21st to end	Night	13% 5% 24% 36% 20% 2	594
September	1st to 10th	Night	9% 5% 28% 36% 19% 4	540
	11th to 20th	Night	14% 7% 29% 35% 15%	540
	21st to end	Night	16% 8% 30% 34% 12% 1	540
October	1st to 10th	Night	16% 7% 34% 30% 12% 2	580
	11th to 20th	Night	16% 10% 31% 31% 12% 1	878
	21st to end	Night	15% 12% 34% 29% 10% 1	990
November	1st to 10th	Night	18% 11% 35% 26% 8% 2	925
	11th to 20th	Night	14% 11% 37% 27% 9% 2	950
	21st to end	Night	16% 14% 36% 26% 7% 1	950
December	1st to 10th	Night	11% 11% 36% 27% 13% 2	950
	11th to 20th	Night	15% 12% 34% 26% 10% 2	950
	21st to end	Night	15% 9% 32% 29% 12% 3	1045

Page generated at 2024-02-02 04:20:27. Version ac07

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