Swift Current
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Swift Current clear sky chart from 2005-11-06 to 2026-04-02.

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	8% 8% 3 8% 5% 5% 5% 4 6% 8% 40%	140106
	Night	6% 9% 4 9% 6% 5% 5% 4 6% 8% 39%	139029
Transparency	Day	42% 6% 15% 25% 11% 1	134686
	Night	43% 5% 15% 24% 12% 1	135471
Seeing	Day	13% 10% 30% 29% 14% 3	17535
	Night	12% 10% 34% 32% 11% 1	27055

By Month

Percentage Cloud Cover SW (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% 11% 5% 15% 8% 8% 6% 5% 5% 6% 26%	4124
	11th to 20th	Day	2 7% 3 12% 6% 8% 9% 8% 8% 11% 26%	4140
	21st to end	Day	4 9% 4 9% 7% 6% 7% 5% 7% 7% 35%	4982
February	1st to 10th	Day	7% 13% 6% 13% 7% 6% 7% 4 6% 8% 25%	1883
	11th to 20th	Day	6% 11% 5% 10% 7% 6% 5% 4 7% 7% 31%	1845
	21st to end	Day	4 11% 3 13% 8% 7% 6% 5% 8% 7% 28%	1567
March	1st to 10th	Day	5% 10% 4 12% 8% 6% 4 3 5% 6% 36%	4711
	11th to 20th	Day	3 10% 6% 13% 6% 5% 5% 4 6% 8% 33%	5110
	21st to end	Day	4 14% 8% 17% 6% 5% 5% 4 6% 7% 23%	5781
April	1st to 10th	Day	7% 10% 3 8% 6% 5% 6% 5% 7% 7% 35%	2413
	11th to 20th	Day	11% 13% 5% 9% 6% 5% 5% 5% 6% 7% 28%	2481
	21st to end	Day	14% 11% 3 6% 4 4 4 4 5% 8% 36%	2695
May	1st to 10th	Day	13% 10% 2 5% 4 4 4 3 5% 7% 41%	6340
	11th to 20th	Day	12% 9% 4 10% 6% 6% 6% 5% 8% 8% 26%	6298
	21st to end	Day	11% 7% 2 7% 5% 5% 5% 4 6% 8% 40%	7187
June	1st to 10th	Day	14% 7% 3 6% 5% 4 5% 5% 7% 9% 35%	3000
	11th to 20th	Day	16% 8% 2 7% 5% 5% 5% 5% 7% 7% 33%	3000
	21st to end	Day	9% 4 2 5% 4 5% 5% 5% 7% 10% 44%	3000
July	1st to 10th	Day	5% 4 2 6% 5% 5% 5% 4 7% 8% 49%	6779
	11th to 20th	Day	7% 4 2 6% 4 5% 5% 4 7% 10% 46%	6780
	21st to end	Day	7% 4 1 4 3 3 4 3 5% 7% 57%	7131
August	1st to 10th	Day	9% 5% 2 6% 4 5% 4 4 6% 8% 46%	6232
	11th to 20th	Day	5% 4 2 4 3 4 4 4 7% 11% 53%	5853
	21st to end	Day	8% 3 2 4 2 3 3 3 4 7% 61%	6342
September	1st to 10th	Day	11% 5% 2 6% 3 3 5% 4 5% 7% 48%	2400
	11th to 20th	Day	13% 7% 2 6% 3 4 4 4 5% 7% 45%	2400
	21st to end	Day	9% 6% 2 5% 4 3 3 3 6% 7% 53%	2108
October	1st to 10th	Day	8% 6% 2 5% 3 3 4 4 5% 9% 51%	3270
	11th to 20th	Day	5% 6% 2 6% 2 4 4 4 7% 10% 50%	3250
	21st to end	Day	5% 8% 5% 7% 4 4 5% 3 6% 7% 47%	3167
November	1st to 10th	Day	9% 16% 5% 9% 8% 4 4 4 5% 5% 32%	1648
	11th to 20th	Day	5% 12% 4 13% 7% 4 5% 5% 5% 7% 33%	1680
	21st to end	Day	8% 11% 5% 11% 7% 5% 6% 4 6% 7% 31%	1680
December	1st to 10th	Day	5% 9% 4 14% 9% 7% 7% 4 6% 6% 28%	2539
	11th to 20th	Day	6% 10% 4 15% 9% 7% 5% 5% 6% 6% 25%	2715
	21st to end	Day	4 7% 3 11% 7% 6% 4 4 7% 6% 42%	3575
January	1st to 10th	Night	3 10% 4 12% 7% 7% 8% 5% 6% 8% 30%	8768
	11th to 20th	Night	3 9% 5% 12% 8% 7% 7% 7% 9% 8% 26%	8820
	21st to end	Night	3 9% 5% 12% 7% 6% 6% 5% 7% 9% 32%	9220
February	1st to 10th	Night	4 11% 5% 10% 7% 7% 7% 5% 8% 8% 26%	2756
	11th to 20th	Night	5% 12% 5% 10% 6% 5% 6% 5% 8% 8% 30%	2662
	21st to end	Night	4 10% 5% 8% 7% 7% 7% 5% 7% 9% 33%	2238
March	1st to 10th	Night	4 8% 4 12% 8% 6% 5% 5% 6% 8% 35%	5387
	11th to 20th	Night	5% 10% 4 11% 7% 6% 5% 4 6% 9% 35%	5110
	21st to end	Night	6% 14% 7% 16% 8% 6% 5% 4 5% 7% 22%	5428
April	1st to 10th	Night	7% 10% 2 8% 6% 5% 5% 4 7% 7% 38%	2010
	11th to 20th	Night	10% 14% 4 10% 5% 4 5% 5% 4 6% 32%	1865
	21st to end	Night	10% 11% 4 7% 6% 6% 5% 5% 5% 7% 35%	1703
May	1st to 10th	Night	15% 9% 3 5% 3 3 4 3 5% 6% 44%	3640
	11th to 20th	Night	16% 9% 4 8% 6% 5% 6% 5% 7% 7% 29%	3617
	21st to end	Night	11% 6% 2 6% 4 4 5% 3 6% 8% 44%	3681
June	1st to 10th	Night	11% 6% 3 6% 4 4 4 4 8% 9% 42%	1400
	11th to 20th	Night	13% 6% 2 7% 4 6% 5% 4 7% 9% 39%	1400
	21st to end	Night	7% 5% 2 5% 4 4 4 4 7% 9% 47%	1400
July	1st to 10th	Night	5% 3 2 5% 3 4 5% 5% 7% 10% 52%	3180
	11th to 20th	Night	7% 3 2 5% 4 4 4 4 6% 9% 54%	3180
	21st to end	Night	7% 3 1 4 2 3 3 3 6% 9% 59%	3731
August	1st to 10th	Night	10% 5% 2 6% 4 4 5% 4 6% 8% 46%	3580
	11th to 20th	Night	4 3 2 5% 4 4 5% 5% 7% 11% 51%	3980
	21st to end	Night	8% 4 2 4 3 3 3 3 4 6% 60%	4634
September	1st to 10th	Night	8% 4 1 4 3 4 4 4 5% 6% 56%	2000
	11th to 20th	Night	9% 7% 3 6% 4 4 4 4 6% 8% 47%	2000
	21st to end	Night	8% 5% 2 4 3 3 3 4 5% 8% 55%	2290
October	1st to 10th	Night	8% 7% 2 6% 3 4 4 3 5% 8% 50%	3920
	11th to 20th	Night	6% 5% 3 5% 3 3 4 3 6% 9% 53%	3898
	21st to end	Night	6% 9% 2 7% 4 4 4 4 6% 8% 45%	4597
November	1st to 10th	Night	11% 14% 4 8% 6% 5% 4 4 5% 7% 33%	2870
	11th to 20th	Night	5% 11% 3 10% 7% 5% 6% 5% 6% 7% 35%	2940
	21st to end	Night	6% 12% 4 11% 6% 5% 5% 5% 6% 8% 32%	2940
December	1st to 10th	Night	7% 13% 6% 15% 7% 6% 6% 4 6% 6% 24%	4865
	11th to 20th	Night	4 14% 6% 13% 8% 7% 6% 5% 6% 7% 24%	5696
	21st to end	Night	3 7% 3 10% 7% 4 5% 4 5% 6% 47%	7623

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	58% 5% 13% 17% 6%	4125
	11th to 20th	Day	48% 6% 16% 20% 9%	4140
	21st to end	Day	46% 6% 22% 18% 8%	4982
February	1st to 10th	Day	57% 6% 11% 16% 11%	1883
	11th to 20th	Day	49% 7% 14% 16% 12% 1	1854
	21st to end	Day	50% 7% 14% 18% 9% 1	1567
March	1st to 10th	Day	47% 4 16% 23% 9%	4711
	11th to 20th	Day	48% 6% 17% 23% 6%	5110
	21st to end	Day	59% 7% 13% 16% 4	5781
April	1st to 10th	Day	45% 7% 14% 23% 10% 1	2413
	11th to 20th	Day	53% 7% 12% 20% 7% 1	2484
	21st to end	Day	46% 6% 12% 26% 8% 1	2695
May	1st to 10th	Day	42% 5% 11% 27% 13% 2	6340
	11th to 20th	Day	51% 7% 13% 21% 7%	6302
	21st to end	Day	40% 7% 16% 25% 11% 1	7188
June	1st to 10th	Day	43% 7% 16% 23% 10% 1	3000
	11th to 20th	Day	48% 7% 13% 22% 9% 1	3000
	21st to end	Day	33% 9% 18% 30% 10%	3000
July	1st to 10th	Day	31% 5% 20% 23% 19% 2	6706
	11th to 20th	Day	33% 4 17% 31% 13% 1	6699
	21st to end	Day	27% 4 13% 33% 17% 6%	6926
August	1st to 10th	Day	30% 5% 13% 34% 17% 1	4536
	11th to 20th	Day	25% 5% 17% 36% 15% 1	4240
	21st to end	Day	26% 3 13% 38% 19% 1	4573
September	1st to 10th	Day	34% 6% 12% 26% 17% 4	2400
	11th to 20th	Day	38% 5% 15% 27% 13% 2	2400
	21st to end	Day	32% 6% 11% 33% 17% 1	2108
October	1st to 10th	Day	32% 3 12% 38% 11% 3	3270
	11th to 20th	Day	29% 4 13% 39% 12% 2	3250
	21st to end	Day	36% 4 13% 36% 10%	3167
November	1st to 10th	Day	53% 6% 12% 20% 8% 1	1648
	11th to 20th	Day	49% 7% 14% 23% 6%	1680
	21st to end	Day	51% 7% 19% 19% 4	1680
December	1st to 10th	Day	56% 6% 20% 14% 3	2539
	11th to 20th	Day	57% 5% 23% 11% 4	2714
	21st to end	Day	41% 4 11% 25% 12% 7%	3575
January	1st to 10th	Night	50% 5% 14% 20% 10%	8769
	11th to 20th	Night	52% 5% 16% 15% 12% 1	8820
	21st to end	Night	48% 6% 19% 20% 7%	9220
February	1st to 10th	Night	51% 7% 14% 16% 11% 1	2756
	11th to 20th	Night	49% 7% 14% 16% 12% 2	2663
	21st to end	Night	45% 7% 14% 24% 10% 1	2238
March	1st to 10th	Night	47% 5% 18% 19% 12%	5387
	11th to 20th	Night	45% 6% 17% 24% 7%	5110
	21st to end	Night	62% 7% 11% 14% 6%	5428
April	1st to 10th	Night	42% 5% 16% 24% 12% 1	2010
	11th to 20th	Night	51% 5% 11% 19% 11% 2	1865
	21st to end	Night	45% 9% 12% 22% 11% 1	1703
May	1st to 10th	Night	40% 5% 8% 28% 18% 2	3640
	11th to 20th	Night	51% 7% 14% 18% 10%	3618
	21st to end	Night	37% 6% 15% 29% 11% 2	3681
June	1st to 10th	Night	36% 8% 15% 25% 13% 2	1400
	11th to 20th	Night	40% 8% 13% 24% 15% 1	1400
	21st to end	Night	30% 9% 18% 31% 11% 1	1400
July	1st to 10th	Night	26% 5% 21% 29% 18% 1	3145
	11th to 20th	Night	29% 4 16% 33% 16% 2	3138
	21st to end	Night	22% 3 16% 34% 21% 4	3624
August	1st to 10th	Night	27% 3 16% 35% 18% 1	2600
	11th to 20th	Night	27% 4 16% 35% 15% 2	2882
	21st to end	Night	28% 3 13% 34% 20% 2	3334
September	1st to 10th	Night	28% 5% 10% 30% 19% 8%	2000
	11th to 20th	Night	36% 6% 13% 26% 16% 4	2000
	21st to end	Night	27% 6% 12% 33% 19% 3	2290
October	1st to 10th	Night	34% 4 11% 36% 15%	3920
	11th to 20th	Night	29% 3 13% 38% 16% 1	3898
	21st to end	Night	37% 4 10% 39% 10% 1	4597
November	1st to 10th	Night	50% 7% 13% 20% 9% 1	2870
	11th to 20th	Night	46% 7% 19% 20% 8%	2940
	21st to end	Night	48% 7% 19% 20% 6%	2940
December	1st to 10th	Night	60% 5% 18% 12% 4 1	4865
	11th to 20th	Night	57% 6% 21% 12% 4	5697
	21st to end	Night	39% 4 11% 27% 15% 5%	7623

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	10% 14% 36% 27% 12% 1	220
	11th to 20th	Day	9% 15% 35% 28% 10% 3	220
	21st to end	Day	13% 14% 42% 23% 7% 1	325
February	1st to 10th	Day	14% 15% 43% 22% 7%	330
	11th to 20th	Day	7% 11% 41% 29% 11% 2	330
	21st to end	Day	7% 10% 46% 26% 7% 4	273
March	1st to 10th	Day	13% 13% 39% 26% 8% 1	376
	11th to 20th	Day	11% 16% 40% 21% 9% 3	540
	21st to end	Day	13% 13% 34% 27% 10% 3	594
April	1st to 10th	Day	13% 17% 36% 27% 7%	505
	11th to 20th	Day	17% 15% 34% 28% 6% 1	492
	21st to end	Day	19% 10% 26% 32% 12% 1	595
May	1st to 10th	Day	15% 8% 25% 32% 16% 4	703
	11th to 20th	Day	14% 9% 26% 30% 16% 5%	725
	21st to end	Day	19% 10% 20% 27% 22% 4	789
June	1st to 10th	Day	16% 12% 26% 30% 12% 4	730
	11th to 20th	Day	20% 13% 30% 24% 11% 2	730
	21st to end	Day	11% 7% 27% 32% 17% 5%	730
July	1st to 10th	Day	8% 5% 23% 35% 25% 5%	721
	11th to 20th	Day	11% 7% 25% 32% 21% 4	718
	21st to end	Day	7% 7% 21% 34% 24% 7%	794
August	1st to 10th	Day	10% 5% 22% 34% 21% 7%	726
	11th to 20th	Day	10% 5% 26% 31% 21% 7%	547
	21st to end	Day	10% 7% 26% 34% 17% 7%	583
September	1st to 10th	Day	14% 8% 30% 29% 15% 4	530
	11th to 20th	Day	16% 7% 25% 35% 15% 2	530
	21st to end	Day	14% 10% 30% 30% 12% 4	425
October	1st to 10th	Day	21% 8% 25% 25% 19% 2	330
	11th to 20th	Day	10% 12% 34% 29% 12% 2	330
	21st to end	Day	13% 16% 40% 21% 8% 1	363
November	1st to 10th	Day	21% 9% 37% 25% 6% 1	330
	11th to 20th	Day	13% 20% 33% 25% 8% 1	330
	21st to end	Day	11% 13% 42% 20% 11% 3	330
December	1st to 10th	Day	10% 11% 50% 20% 6% 3	279
	11th to 20th	Day	11% 19% 45% 17% 6% 1	220
	21st to end	Day	10% 12% 38% 26% 13% 2	242
January	1st to 10th	Night	10% 14% 41% 25% 9% 1	1050
	11th to 20th	Night	10% 16% 40% 26% 6% 1	1050
	21st to end	Night	9% 17% 39% 26% 9% 1	1155
February	1st to 10th	Night	10% 10% 36% 32% 11% 2	866
	11th to 20th	Night	10% 10% 38% 31% 10% 1	824
	21st to end	Night	8% 9% 33% 33% 15% 3	692
March	1st to 10th	Night	10% 11% 37% 31% 10% 1	840
	11th to 20th	Night	12% 10% 40% 29% 8% 2	840
	21st to end	Night	12% 10% 33% 32% 11% 2	845
April	1st to 10th	Night	12% 7% 36% 34% 10% 1	603
	11th to 20th	Night	16% 9% 37% 30% 7% 1	593
	21st to end	Night	17% 9% 27% 38% 9%	600
May	1st to 10th	Night	15% 6% 28% 34% 17% 2	600
	11th to 20th	Night	15% 6% 25% 37% 16% 2	591
	21st to end	Night	21% 7% 19% 34% 17% 2	528
June	1st to 10th	Night	16% 7% 30% 29% 16% 2	400
	11th to 20th	Night	16% 9% 27% 36% 12%	400
	21st to end	Night	11% 6% 24% 41% 17% 2	400
July	1st to 10th	Night	7% 4 24% 45% 20% 1	390
	11th to 20th	Night	9% 5% 27% 41% 17% 2	388
	21st to end	Night	5% 4 26% 44% 19% 2	548
August	1st to 10th	Night	9% 3 26% 40% 19% 3	597
	11th to 20th	Night	8% 3 21% 44% 24% 2	594
	21st to end	Night	12% 3 27% 38% 20% 1	660
September	1st to 10th	Night	11% 4 29% 40% 15% 2	600
	11th to 20th	Night	13% 5% 26% 40% 16% 1	600
	21st to end	Night	12% 4 35% 39% 10% 1	785
October	1st to 10th	Night	17% 8% 29% 33% 12% 1	800
	11th to 20th	Night	13% 8% 35% 31% 11% 2	800
	21st to end	Night	15% 11% 39% 28% 6% 1	1036
November	1st to 10th	Night	19% 10% 37% 28% 5%	1025
	11th to 20th	Night	11% 15% 39% 25% 8% 1	1050
	21st to end	Night	12% 12% 42% 25% 7% 1	1050
December	1st to 10th	Night	11% 11% 40% 26% 10% 2	1050
	11th to 20th	Night	12% 16% 40% 25% 7% 1	1050
	21st to end	Night	12% 10% 39% 29% 9% 1	1155

Page generated at 2026-03-30 00:18:40. Version ac07

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